Parameter calibration method and system of naked eye 3D display module

Abstract

The invention discloses a parameter calibration method and system of a naked-eye 3D display module, the naked-eye 3D display module comprises a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen, and the method comprises the following steps: 1, obtaining a test image which is an image shot at a target observation point at a fixed position, comprising a left view area and a right view area; 2, determining whether the test image meets a set calibration image condition or not, and controlling the color difference between the first color block and the second color block to be greater than or equal to a color difference threshold value; 3, if not, adjusting the characteristic parameters, and returning to execute the first step; the first step to the third step are executed circularly, and when the display parameters and / or the lens parameters are different, the obtained test images are different; and when the obtained test image meets a calibration image condition, determining calibration parameters of the naked eye 3D display module based on the adjusted feature parameters.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of naked-eye 3D display, and in particular, relates to a parameter calibration method and system for a naked-eye 3D display module. Background Art

[0002] Naked-eye 3D (Three Dimensional) display devices refer to display devices that achieve stereoscopic visual effects without the aid of external tools such as polarized glasses. In the production of naked-eye 3D display modules, the theoretical and actual values ​​of parameters may not match each other during the process of laminating cylindrical lenses. If the theoretical values ​​are still used to present 3D effects, ghosting, blurring, and other effects may occur. Therefore, it is necessary to calibrate the actual values ​​of the parameters.

[0003] In the related art, when calibrating the actual parameters of the naked-eye 3D display module, there is a technical problem of complicated operation process due to the unreasonable design of the calibration method. Summary of the invention

[0004] The disclosed embodiments provide a method and system for calibrating parameters of a naked-eye 3D display module, thereby making the parameter calibration process of the naked-eye 3D display module simple to operate and more suitable for production line calibration of the naked-eye 3D display module.

[0005] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0006] A first aspect of the embodiments of the present disclosure provides a parameter calibration method for a naked-eye 3D display module, wherein the naked-eye 3D display module includes a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen, and the method includes:

[0007] Step 1: acquiring a test image, wherein the test image is an image obtained by photographing a display screen of the naked-eye 3D display module at a target observation point at a fixed position through an image acquisition device, and the test image includes a left view area and a right view area corresponding to the display screen;

[0008] Step 2: performing image processing on the test image, and determining whether the test image meets a set calibration image condition, wherein the calibration image condition includes: the areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and the color difference between the first color block and the second color block is greater than or equal to a color difference threshold;

[0009] Step 3: If the test image does not meet the calibration image condition, the characteristic parameters of the naked-eye 3D display module are adjusted, and after the characteristic parameters are adjusted, the first step is returned to be executed;

[0010] Executing the first step to the third step in a loop, wherein the characteristic parameters include display parameters and lens parameters, and when the display parameters and / or the lens parameters are different, the acquired test images are different;

[0011] In a case where the acquired test image meets the calibration image condition, the calibration parameters of the naked-eye 3D display module are determined based on the adjusted characteristic parameters.

[0012] Optionally, acquiring a test image includes:

[0013] Controlling the naked-eye 3D display module to display an initial picture based on preset parameters, wherein the preset parameters include preset feature parameters and coordinate parameters of the target observation point;

[0014] The test image is obtained by photographing the initial picture at the target observation point by the image acquisition device.

[0015] Optionally, when adjusting the characteristic parameters of the naked-eye 3D display module, the display parameters are adjusted before the lens parameters.

[0016] Optionally, the display screen includes a plurality of sub-pixels distributed in an array in a first direction and a second direction, and the display parameter includes a pixel period;

[0017] Each cylindrical lens in the cylindrical lens array corresponds to at least one sub-pixel, and the lens parameters include an offset, which is an offset of the optical axis of the cylindrical lens relative to the central axis of the corresponding sub-pixel in the first direction.

[0018] Optionally, the method according to claim 1 is characterized in that the target observation point and the naked-eye 3D display module are located in the same coordinate system, the coordinate system includes a first coordinate axis and a second coordinate axis that are perpendicular to each other, the direction of the first coordinate axis is parallel to the first direction of the display screen, and the direction of the second coordinate axis is perpendicular to the light-emitting surface of the display screen; the target observation point and the center of the display screen have the same coordinates on the first coordinate axis.

[0019] Optionally, determining calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters includes:

[0020] Determining candidate calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters;

[0021] Controlling the naked-eye 3D display module to display images based on the candidate calibration parameters and the coordinate parameters of the reference observation points;

[0022] Acquire a reference image, where the reference image is an image obtained by photographing a display screen of the naked-eye 3D display module at the reference observation point by the image acquisition device;

[0023] Adjusting the characteristic parameters based on the reference image, and reacquiring the reference image after each adjustment of the characteristic parameters;

[0024] In a case where the reference image satisfies the calibration image condition, using the adjusted characteristic parameters as verification parameters;

[0025] The candidate calibration parameters are verified based on the verification parameters, and if the verification passes, the candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

[0026] Optionally, there are at least two reference observation points, and the at least two reference observation points are evenly spaced on both sides of the target observation point, and the distance between the target observation point and the reference observation point and / or the distance between the two reference observation points is a multiple of the pupil distance of a human eye;

[0027] The corresponding verification parameters are at least two, and the verifying the candidate calibration parameters based on the verification parameters includes:

[0028] comparing the mean of at least two of the verification parameters with the candidate calibration parameters;

[0029] If the difference between the mean and the candidate calibration parameter is less than the difference threshold, the verification passes.

[0030] Optionally, after comparing the mean of at least two of the verification parameters with the candidate calibration parameters, the method further comprises:

[0031] If the difference between the mean and the candidate calibration parameter is greater than or equal to the difference threshold, the verification fails;

[0032] Adjusting the candidate calibration parameters, and acquiring the test image and the reference image after each adjustment of the candidate calibration parameters;

[0033] When the test image and the reference image simultaneously satisfy the calibration image condition, the adjusted candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

[0034] Optionally, the adjusting the candidate calibration parameters includes:

[0035] If the mean is smaller than the candidate calibration parameter, increasing the candidate calibration parameter;

[0036] If the mean is greater than the candidate calibration parameter, the candidate calibration parameter is reduced.

[0037] Optionally, the characteristic parameters further include a lens width and a fitting height, wherein the lens width is a width of the cylindrical lens in the first direction of the display screen, and the fitting height is a height of the center of the cylindrical lens relative to the light emitting surface of the display screen;

[0038] The step of adjusting the candidate calibration parameters includes:

[0039] The lens width and / or the fitting height are adjusted.

[0040] A second aspect of the embodiments of the present disclosure provides a parameter calibration device for a naked-eye 3D display module, wherein the naked-eye 3D display module includes a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen, and the device includes:

[0041] an acquisition unit, configured to acquire a test image, wherein the test image is an image obtained by photographing a display screen of the naked-eye 3D display module at a target observation point at a fixed position through an image acquisition device, and the test image includes a left view area and a right view area corresponding to the display screen;

[0042] a first determination unit, configured to perform image processing on the test image and determine whether the test image satisfies a set calibration image condition, wherein the calibration image condition includes: areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and a color difference between the first color block and the second color block is greater than or equal to a color difference threshold.

[0043] an adjusting unit, configured to adjust characteristic parameters of the naked-eye 3D display module if the test image does not meet the calibration image condition, and reacquire the test image based on the acquiring unit after the characteristic parameters are adjusted;

[0044] Wherein, the characteristic parameters include display parameters and lens parameters, and when the display parameters and / or the lens parameters are different, the acquired test images are different;

[0045] The second determination unit is used to determine the calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters when the acquired test image meets the calibration image condition.

[0046] A third aspect of the disclosed embodiments provides a parameter calibration system for a naked-eye 3D display module, comprising: a control device and an image acquisition device in communication with the control device;

[0047] The image acquisition device is located at the target observation point and is used to acquire the test image;

[0048] The control device is used to communicate with the naked-eye 3D display module, and to execute the parameter calibration method of the naked-eye 3D display module as described in any one of the first aspects.

[0049] Optionally, there are multiple image acquisition devices, one of which is located at the target observation point, and the other image acquisition devices are located at the reference observation point.

[0050] Optionally, among the plurality of image acquisition devices, the spacing between any two of the image acquisition devices is a multiple of the pupil distance of a human eye.

[0051] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein at least one computer program instruction is stored in the computer-readable storage medium, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0052] According to a fifth aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0053] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0054] The parameter calibration method of the naked-eye 3D display module provided by the embodiment of the present disclosure, during the entire parameter calibration process of the naked-eye 3D display module, a test image is captured multiple times at a target observation point at a fixed position by an image acquisition device, without constantly changing the target observation point, and the operation is simple, and the method is more suitable for production line calibration of the naked-eye 3D display module, such as production line calibration at the module stage or the finished product stage; at the same time, by adjusting the characteristic parameters of the naked-eye 3D display module multiple times, the test image finally acquired includes a left view area (simulating the view observed by the left eye) and a right view area (simulating the view observed by the right eye) with substantially the same area, and the color difference of the two view areas is greater than or equal to the color difference threshold, which is equivalent to the optimal image effect observed by the left eye and the right eye; different color blocks are used for arranging the images, so as to reduce the cumulative amount of the cylindrical lenses when arranged from the middle to both sides, reduce the crosstalk on the edges, improve the image display effect, and thus improve the accuracy of the parameter calibration results. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0056] Figure 1 A diagram showing the deployment of a test environment for a naked-eye 3D display module according to an embodiment of the present disclosure is shown;

[0057] Figure 2 A flow chart of a parameter calibration method of a naked-eye 3D display module according to an embodiment of the present disclosure is shown;

[0058] Figure 3 Another flow chart showing the parameter calibration method of the naked-eye 3D display module according to the embodiment of the present disclosure;

[0059] Figure 4 A schematic diagram showing one of the coordinate systems of an embodiment of the present disclosure is shown;

[0060] Figure 5 A schematic diagram showing the positional relationship between the cylindrical lens array and the display screen according to an embodiment of the present disclosure is shown;

[0061] Figure 6 A schematic diagram showing a test image that meets the calibration image condition in an embodiment of the present disclosure;

[0062] Figure 7 A schematic diagram showing a test image satisfying the intermediate image condition in an embodiment of the present disclosure;

[0063] Figure 8A detailed flowchart of S40 of an embodiment of the present disclosure is shown.

[0064] Fig. 9 A schematic diagram showing the transition between left and right views when adjusting the offset in an embodiment of the present disclosure is shown;

[0065] Fig.10 A schematic diagram of a parallax diamond region according to an embodiment of the present disclosure is shown;

[0066] Fig.11 A comparison diagram of a reference image and a test image according to an embodiment of the present disclosure is shown;

[0067] Fig.12 A structural diagram of a calibration device for a naked-eye 3D display module according to an embodiment of the present disclosure is shown;

[0068] Fig.13 A schematic diagram showing a computer-readable storage medium in an embodiment of the present disclosure is shown;

[0069] Fig.14 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0071] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0072] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0073] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those shown or described.

[0074] As used herein, "about," "approximately," "substantially" includes the stated value and the average value that is within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0075] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0076] It should be noted that the naked-eye 3D (Three Dimensional) display module refers to a display module that achieves a stereoscopic visual effect without the aid of external tools such as polarized glasses. Among them, the cylindrical lens array has no effect on the brightness of the display screen, and the stereoscopic imaging is better, so it is currently the most widely used naked-eye 3D display technology. When the naked-eye 3D display module displays images, it uses the light-splitting effect of the cylindrical lens and the 3D imaging principle of the human eye to effectively separate the 3D image information that has been processed into left and right views according to preset rules, and allows the left and right eyes to receive them respectively in a certain area, thereby forming a 3D image in the brain.

[0077] During the production of naked-eye 3D display modules, the theoretical and actual values ​​of parameters may not match each other during the process of laminating the cylindrical lens array. If the theoretical values ​​are still used to present 3D images, ghosting, blurring and other effects may occur. Therefore, it is necessary to calibrate the actual parameter values ​​of the cylindrical lens array to ensure a good naked-eye 3D display effect.

[0078] In the related art, when calibrating the actual parameters of the naked-eye 3D display module, the operation process is cumbersome and inefficient due to the unreasonable design of the calibration method. For example: some calibration methods display a single color block in the naked-eye 3D display module, and constantly change the image acquisition position, collect the display image of the 3D display module multiple times at different points, and then fit the actual parameters of the cylindrical lens based on the mathematical formula. However, this method requires constant change of the image acquisition position, and the operation process is cumbersome and inefficient. In addition, when a single color block is used as the display image, when the collected test image is arranged, it ignores the fact that when the cylindrical lens is arranged from the middle to both sides, there is a certain amount of accumulation in the arrangement, which will increase the crosstalk on the edge and the image display effect is poor, so the accuracy of the parameter calibration result is poor.

[0079] Based on the above, an embodiment of the present disclosure provides a parameter calibration method for a naked-eye 3D display module. The method is simple to operate and can improve the accuracy of parameter calibration results.

[0080] The parameter calibration method of the naked-eye 3D display module according to the embodiment of the present disclosure is described below with reference to specific drawings.

[0081] See also Figure 1 , showing a test environment deployment diagram of the naked-eye 3D display module of an embodiment of the present disclosure.

[0082] like Figure 1 As shown, the embodiment of the present disclosure is provided with at least one image acquisition device 1, wherein one image acquisition device 1 is located at a target observation point at a fixed position to acquire images of the display screen of the naked-eye 3D display module 2; in addition, a control device 3 is provided, and the control device 3 is connected to the naked-eye 3D display module 2 and the image acquisition device 1. On the one hand, the characteristic parameters of the naked-eye 3D display module 2 are adjusted so that the naked-eye 3D display module 2 updates the display screen based on the adjusted characteristic parameters; on the other hand, the current display screen of the naked-eye 3D display module 2 is analyzed and processed by acquiring the test image acquired by the image acquisition device 1. The working principle of the above test environment will be described in detail in conjunction with the parameter calibration method of the naked-eye 3D display module 2 below.

[0083] See also Figure 2 , which shows a flow chart of a parameter calibration method of a naked-eye 3D display module according to an embodiment of the present disclosure; see Figure 3 , shows another flow chart of the parameter calibration method of the naked-eye 3D display module according to an embodiment of the present disclosure.

[0084] like Figure 2 and Figure 3As shown, the embodiment of the present disclosure provides a parameter calibration method for a naked-eye 3D display module, wherein the naked-eye 3D display module includes a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen. The method can be executed in a control device or a processing device independent of the naked-eye 3D display module, and the method includes but is not limited to:

[0085] S10: First step: acquiring a test image, wherein the test image is an image obtained by photographing a display screen of the naked-eye 3D display module at a target observation point at a fixed position through an image acquisition device, and the test image includes a left view area and a right view area corresponding to the display screen;

[0086] S20: Second step: performing image processing on the test image and determining whether the test image satisfies a set calibration image condition, wherein the calibration image condition includes: the areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and the color difference between the first color block and the second color block is greater than or equal to a color difference threshold.

[0087] S30: a third step: if the test image does not meet the calibration image condition, adjusting the characteristic parameters of the naked-eye 3D display module, and returning to execute the first step after the characteristic parameters are adjusted, wherein the characteristic parameters include display parameters and lens parameters, and when the display parameters and / or the lens parameters are different, the acquired test image is different;

[0088] Execute the first step to the third step in a loop until the acquired test image meets the calibration image condition;

[0089] S40: Determine calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters.

[0090] Therefore, in the parameter calibration method of the naked-eye 3D display module provided by the embodiment of the present disclosure, during the entire parameter calibration process of the naked-eye 3D display module, the image acquisition device is used to capture test images multiple times at a target observation point at a fixed position, without constantly changing the target observation point. The operation is simple and the method is more suitable for production line calibration of the naked-eye 3D display module, such as production line calibration at the module stage or the finished product stage. At the same time, by adjusting the characteristic parameters of the naked-eye 3D display module multiple times, the test image finally acquired includes a left view area (simulating the view observed by the left eye) and a right view area (simulating the view observed by the right eye) with substantially the same area, and the color difference of the two view areas is greater than or equal to the color difference threshold, which is equivalent to the optimal image effect observed by the left eye and the right eye. Different color blocks are used for arranging the images, which can reduce the cumulative amount of the cylindrical lenses when arranged from the middle to both sides, reduce crosstalk on the edges, improve the image display effect, and thus improve the accuracy of the parameter calibration results.

[0091] See also Figure 4 , showing a schematic diagram of the coordinate system of an embodiment of the present disclosure.

[0092] like Figure 4 As shown, before S10, the embodiment of the present disclosure can establish a coordinate system according to the position and direction of the naked-eye 3D display module, for example, it can be a two-dimensional coordinate system, or a three-dimensional coordinate system, wherein the two-dimensional coordinate system and the three-dimensional coordinate system can each include a first coordinate axis and a second coordinate axis, the direction of the first coordinate axis is parallel to the first direction of the display screen, and the direction of the second coordinate axis of the coordinate system is perpendicular to the light-emitting surface of the display screen; in addition, the three-dimensional coordinate system can also include a third coordinate axis, and the direction of the third coordinate axis is perpendicular to the first coordinate axis and the second coordinate axis, for example, parallel to the second direction of the display screen.

[0093] It should be noted that the display screen includes a plurality of sub-pixels distributed in an array in a first direction and a second direction. The first direction may be a pixel row direction of the plurality of sub-pixels, and the second direction may be a pixel column direction of the plurality of sub-pixels.

[0094] For example: taking the center of the display screen of the naked-eye 3D display module as the origin O, a two-dimensional coordinate system is established along the direction X of the first coordinate axis and the direction Z of the second coordinate axis; or, taking the center of the display screen of the naked-eye 3D display module as the origin O, a three-dimensional coordinate system is established along the direction X of the first coordinate axis, the direction Z of the second coordinate axis and the direction Y of the third coordinate axis.

[0095] It should be noted that the origin of the coordinate system can be determined according to actual needs and is not specifically limited. In the embodiment of the present disclosure, the origin is set at the center of the display screen of the naked-eye 3D display module, the purpose of which is to better determine the position of the coordinate system; in addition, the establishment of the coordinate system can be adjusted according to actual needs and is not limited here.

[0096] In some embodiments, the target observation point and the naked-eye 3D display module are located in the same coordinate system, and the coordinate system includes a first coordinate axis and a second coordinate axis that are perpendicular to each other, the direction of the first coordinate axis is parallel to the first direction of the display screen, and the direction of the second coordinate axis is perpendicular to the light-emitting surface of the display screen; the target observation point and the center of the display screen have the same coordinates on the first coordinate axis.

[0097] For example: taking the center of the display screen of the naked-eye 3D display module as the origin O, a two-dimensional coordinate system is established along the direction X of the first coordinate axis and the direction Z of the second coordinate axis. The target observation point A has the same coordinate as the screen center of the display screen in the X-axis direction, that is, the target observation point A is located on the Z-axis.

[0098] For example: take the center of the display screen of the naked eye 3D display module as the origin O, establish a three-dimensional coordinate system along the direction X of the first coordinate axis, the direction Z of the second coordinate axis, and the direction Y of the third coordinate axis. The coordinates of the target observation point A and the center of the display screen in the X-axis direction are the same, that is, the target observation point is located in the ZOY plane. For the convenience of analysis, the coordinates of the target observation point A and the center of the screen in the Y-axis direction are further set to be the same, that is, the target observation point A is located on the Z-axis.

[0099] In some embodiments, the vertical distance between the target observation point and the light emitting surface of the display screen can be set according to parameters such as the size of the display screen. For example, when the size of the display screen is 15.6 inches, the vertical distance between the target observation point and the light emitting surface of the display screen can be 700 mm, 750 mm, etc. Of course, the target observation point should be located within the pre-designed observation viewing angle of the naked-eye 3D display module, so that the display screen of the naked-eye 3D display module can be observed.

[0100] In the embodiment of the present disclosure, an image acquisition device is fixedly deployed at a target observation point, and the image acquisition device is used to acquire images of the display screen of the naked-eye 3D display module. Exemplarily, the image acquisition device may be a monocular camera, a binocular camera, or the like.

[0101] For ease of understanding, the meanings of the display parameters and lens parameters involved in the embodiments of the present disclosure are first explained with reference to the accompanying drawings.

[0102] See also Figure 5 , showing a schematic diagram of the positional relationship between the cylindrical lens array and the display screen in an embodiment of the present disclosure.

[0103] In some embodiments, the characteristic parameters include but are not limited to display parameters and lens parameters. The display parameters include but are not limited to pixel period l ens, and the lens parameters include but are not limited to lens width pitch, fitting height h, and offset offset.

[0104] The display screen 4 includes a plurality of sub-pixels distributed in an array in a first direction and a second direction, such as R (Red) sub-pixels, G (Green) sub-pixels and B (Blue) sub-pixels, and the pixel period may be an arrangement period of the plurality of sub-pixels, such as an arrangement period in the pixel row direction.

[0105] like Figure 5 As shown, each cylindrical lens in the cylindrical lens array 5 corresponds to at least one sub-pixel, and the lens parameters include an offset, which is an offset of the optical axis of the cylindrical lens relative to the central axis of the corresponding sub-pixel in the first direction.

[0106] Under normal circumstances, the fitting angle between the cylindrical lens array 5 and the display screen is 90 degrees, that is, the optical axis of the cylindrical lens is perpendicular to the display screen 4. Therefore, the lens width can be the width of the cylindrical lens in the first direction of the display screen 4; the fitting height is the height of the center of the cylindrical lens (for example, the geometric center) relative to the light emitting surface of the display screen 4.

[0107] It is understandable that within a period of time, S10 to S30 of the embodiment of the present disclosure may be executed cyclically. The implementation principle of S10 to S30 is described in detail below.

[0108] In S10, acquiring a test image includes:

[0109] S11. Controlling the naked-eye 3D display module to display an initial screen based on preset parameters, wherein the preset parameters include preset feature parameters and coordinate parameters of the target observation point;

[0110] For example, the control device transmits the preset pixel period, lens width, fitting height and offset, and coordinate parameters of the target observation point to the naked-eye 3D display module through the parameter debugging interface, so that the naked-eye 3D display module displays the initial picture. It can be understood that the preset parameters are known values ​​and can be stored in the control device.

[0111] Exemplarily, the initial image may be a pure color image displayed in full screen, such as a full black image, a full white image, a full red image, a full blue image, a full green image, etc., so that calibration parameters can be determined subsequently by observing the transformation from a pure color image to a non-pure color image.

[0112] S12. Acquire the test image obtained by photographing the initial picture at the target observation point by the image acquisition device.

[0113] It can be understood that the test image captured at the target observation point is similar to the image obtained when the human eye observes the naked-eye 3D display module at the target observation point.

[0114] In S20, performing image processing on the test image may include:

[0115] Performing grayscale processing on the test image to obtain a grayscale average value of a first color block in the left view area and a grayscale average value of a second color block in the right view area;

[0116] The determining whether the test image satisfies a set calibration image condition may include:

[0117] The difference between the grayscale average value of the first color block and the grayscale average value of the second color block is greater than or equal to a color difference threshold, for example, reaching 230, 232, 235, etc.

[0118] Exemplarily, the color difference between the first color block and the second color block reaching a preset color difference threshold may also be: the difference between the grayscale average value in the target area of ​​the first color block and the grayscale average value in the target area of ​​the second color block is greater than or equal to the color difference threshold, for example, reaching 230, 232, 235, etc., wherein the target area may be the middle area of ​​the color block, and the ratio between the area of ​​the target area and the total area of ​​the color block may be 20%-40%, for example, 20%, 25%, 30%, 35%, 40%, etc.

[0119] In S20, the calibration image condition includes: the areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and the color difference between the first color block and the second color block is greater than or equal to a color difference threshold.

[0120] It can be understood that the areas of the left view area and the right view area are substantially the same, which can mean that the left view area corresponds to the display screen of the left screen of the display screen, and the right view area corresponds to the display screen of the right screen of the display screen, and the left screen and the right screen can each occupy 50% of the area of ​​the display screen, so that the left view area and the right view area are the same, considering that the area difference between the two can also be an average value within an acceptable deviation range of a specific value, so the areas of the left view area and the right view area are substantially the same. The acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement being discussed and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system).

[0121] See also Figure 6 , which shows a schematic diagram of a test image that meets the calibration image conditions in an embodiment of the present disclosure.

[0122] like Figure 6 As shown, in the display screen included in the test image, the areas of the left view area and the right view area are basically the same, the color blocks of the left view area and the right view area are different in color, the left view area is a black block, and the right view area is a white block, and the color difference between the black block and the white block is greater than or equal to the color difference threshold. Therefore, the test image meets the calibration image conditions.

[0123] In S30 , when the test image does not meet the calibration image condition, adjusting the characteristic parameters of the naked-eye 3D display module may include adjusting the display parameters and / or lens parameters of the naked-eye 3D display module.

[0124] Among them, after each characteristic parameter adjustment, return to S10 to re-acquire the test image. Since the characteristic parameters change, the display screen of the naked-eye 3D display module also changes, and then the captured test image also changes, that is, when the display parameters and / or the lens parameters are different, the acquired test image is different.

[0125] For example: under the preset pixel period, lens width, fitting height and offset, the test image includes a full-screen black picture. After adjusting one or more parameters, the full-screen black picture may become a black picture in part and a white picture in part. After adjusting the parameters multiple times, the picture presented in the final collected test image meets the calibration image conditions.

[0126] In some embodiments, when adjusting the characteristic parameters of the naked-eye 3D display module, the display parameters are adjusted before the lens parameters.

[0127] It is understandable that in some cases, the effect of adjusting the display parameters on the display screen of the naked-eye 3D display module is greater than the effect of adjusting the lens parameters on the display screen of the naked-eye 3D display module. Therefore, when adjusting the characteristic parameters of the naked-eye 3D display module, the display parameters can be adjusted first to adjust the display screen to a large extent, and when the display screen is adjusted to a certain extent, the display screen can be fine-tuned based on the lens parameters, thereby achieving refinement of the display screen adjustment and improving the adjustment accuracy.

[0128] The following is an exemplary description of the parameter adjustment process of the naked eye 3D display module:

[0129] Step 1: adjusting the display parameters of the naked-eye 3D display module based on the test image acquired for the first time, and reacquiring the test image after each adjustment of the display parameters;

[0130] It can be understood that the test image obtained for the first time refers to an image obtained by shooting the initial picture of the naked-eye 3D display module through an image acquisition device.

[0131] Taking adjusting the pixel period as an example, after the test image is acquired for the first time, for example, the test image is a pure black or pure white image, the arrangement period of the sub-pixels is changed by adjusting the pixel period, thereby changing the distribution of color blocks in the display screen on the display screen, for example, the full-screen pure black image changes to a partial black image and a partial white image.

[0132] It is understandable that by adjusting the pixel period once or multiple times, the displayed image after each adjustment of the pixel period is different, and thus the collected test image is different. In order to improve the accuracy of the parameter results, the pixel period can be adjusted a small number of times, so that the pixel period can continuously approach the calibrated pixel period that optimizes the display effect.

[0133] Step 2: When the test image meets the intermediate image condition, adjusting the lens parameters of the naked-eye 3D display module, and reacquiring the test image after each adjustment of the lens parameters, until the test image meets the calibration image condition;

[0134] The intermediate image condition includes: in the left viewing area and the right viewing area, each viewing area includes a third color block and a fourth color block, and the areas of the third color block and the fourth color block are substantially the same.

[0135] See also Figure 7 , shows a schematic diagram of a test image that meets the intermediate image condition in an embodiment of the present disclosure.

[0136] like Figure 7 As shown, the intermediate image condition includes: in the left view area and the right view area, each view area includes a third color block and a fourth color block, and the areas of the third color block and the fourth color block are substantially the same. For example: the left view area includes a black and white mixed color block, the right view area includes a black and white mixed color block, and in each view area, the areas of the black color block and the white color block are substantially the same, for example, each accounts for 50%, or the black color block accounts for 49% and the white color block accounts for 51%, indicating that the adjustment of the pixel period is substantially completed at this time.

[0137] In the embodiment of the present disclosure, the pixel period, lens width, lamination height, and coordinates of the target observation point satisfy the following relationship:

[0138]

[0139] Wherein, l ens represents the pixel period, pitch represents the lens width, h represents the fitting height, and z represents the vertical distance of the target observation point relative to the display screen.

[0140] In the embodiment of the present disclosure, the starting arrangement position, offset, fit height and coordinates of the target observation point relative to the center of the screen also satisfy the following relationship:

[0141]

[0142] Among them, x represents the starting position of the image arrangement relative to the center of the screen, and offset represents the offset.

[0143] It can be understood that the corresponding relationship recorded in formula (1) and formula (2) can be pre-stored in the naked-eye 3D display module. Therefore, the control device only needs to adjust one of the parameters, and the naked-eye 3D display module can adjust the remaining parameters accordingly based on the corresponding relationship, thereby reducing the workload of the control device.

[0144] It can be seen that there is a set correspondence between the pixel period, lens width, fitting height and the coordinates of the target observation point; there is a set correspondence between the starting arrangement position, offset, fitting height and the coordinates of the target observation point. Combining formula (1) and formula (2), it can be seen that, in essence, the pixel period, lens width, fitting height, coordinates of the target observation point, offset and starting arrangement position affect each other. When one of the parameters changes, one or more other parameters may also change. Then, in the embodiment of the present disclosure, the coordinates of the target observation point and the starting arrangement position are known values, which can remain unchanged during the characteristic parameter adjustment process. Then, when the pixel period is adjusted, one or more parameters of the lens width, fitting height and offset may also change. Therefore, when the pixel period stops adjusting, it is also necessary to record the adjusted lens width, fitting height and offset.

[0145] Taking the offset adjustment as an example, when adjusting the lens parameters of the naked-eye 3D display module, the offset can be adjusted. When the offset changes, the color block distribution of the display screen in the display screen further changes. The offset is fine-tuned back and forth multiple times until the test image corresponding to the display screen meets the calibration image condition. Since the pixel period has been adjusted, the pixel period can be kept unchanged. In order to make the offset, lens width and fitting height still meet the corresponding relationship in formulas (1) and (2), in the process of adjusting the offset, the lens width and fitting height are actually adjusted accordingly based on the corresponding relationship. When the offset stops being adjusted, it is also necessary to record the adjusted lens width, fitting height and offset.

[0146] In S40, determining calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters includes:

[0147] Based on the adjusted pixel period, offset, lens width and fitting height, the calibration parameters of the naked-eye 3D display module are determined.

[0148] Therefore, the disclosed embodiment can shoot the test image multiple times at the target observation point at a fixed position by only one image acquisition device, and adjust the characteristic parameters of the naked-eye 3D display device multiple times according to the acquired test image, until the acquired test image meets the calibration image condition, and the calibration parameters of the naked-eye 3D display module can be obtained. The whole process does not require changing the image acquisition point position, and does not require controlling the movement of the image acquisition device. The parameter calibration is realized at the software level, so the operation process is simple, which improves the calibration efficiency of the naked-eye 3D display module.

[0149] See also Figure 8 , shows a detailed flowchart of S40 of an embodiment of the present disclosure.

[0150] like Figure 8 As shown, in some embodiments, determining the calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters includes:

[0151] S41. Determining candidate calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters;

[0152] It can be understood that the calibration parameters obtained based on S10-S40 are obtained by only capturing images at the target observation point. In order to further improve the accuracy of the parameter calibration results, the embodiment of the present disclosure further verifies the calibration parameters by capturing images of the naked-eye 3D display module at a reference observation point.

[0153] S42. Controlling the naked-eye 3D display module to display the image based on the candidate calibration parameters and the coordinate parameters of the reference observation point;

[0154] It can be understood that the candidate calibration parameters obtained after S30 include pixel period, lens width, fitting height and offset. On this basis, the coordinates of the reference observation point are input into the naked-eye 3D display module so that the naked-eye 3D display module updates the display based on the updated coordinates.

[0155] Exemplarily, the reference observation point includes at least one, for example, two, three, four, etc. For example, reference observation points B and C are set, which are located on the left and right sides of the target observation A respectively.

[0156] S43. Acquire a reference image, wherein the reference image is an image obtained by photographing a display screen of the naked-eye 3D display module at the reference observation point by the image acquisition device;

[0157] S44. Adjusting the characteristic parameters based on the reference image, and reacquiring the reference image after each adjustment of the characteristic parameters;

[0158] S45. When the reference image satisfies the calibration image condition, the adjusted characteristic parameter is used as a verification parameter;

[0159] It can be understood that the principles of obtaining a reference image, adjusting feature parameters, and determining verification parameters in S43-S45 are similar to the principles of obtaining a test image, adjusting feature parameters, and determining candidate calibrations, and will not be repeated here.

[0160] S46. Verify the candidate calibration parameters based on the verification parameters, and if the verification passes, determine the candidate calibration parameters as the calibration parameters of the naked-eye 3D display module.

[0161] It is understandable that the verification parameters can satisfy that the image obtained at the reference observation point has the best display effect, and the candidate calibration parameters can satisfy that the image obtained at the target observation point has the best display effect. However, it is still impossible to determine whether the candidate calibration parameters can simultaneously make the images obtained at the target observation point and the reference observation point have the best display effect. Therefore, the embodiment of the present disclosure also verifies the candidate calibration parameters based on the verification parameters to further improve the accuracy of the candidate calibration parameters.

[0162] In some embodiments, there are at least two reference observation points, and the at least two reference observation points are evenly spaced on both sides of the target observation point. The distance between the target observation point and the reference observation point and / or the distance between the two reference observation points is a multiple of the pupil distance of the human eye, for example, 65mm, 130mm, 195mm, etc.

[0163] For example: taking the center of the display screen of the naked-eye 3D display module as the origin O, a two-dimensional coordinate system is established along the direction X of the first coordinate axis and the direction Z of the second coordinate axis, the target observation point A and the screen center of the display screen have the same coordinates in the X-axis direction, the reference observation points B and C have the same coordinates as the target observation point A on the second coordinate axis, that is, the target observation point A, the reference observation points B and C are all located on the Z-axis, the target observation point A, the reference observation points B and C are located on the same straight line, and the straight line is parallel to the pixel row direction.

[0164] In S46, the reference observation points are at least two, the corresponding verification parameters are at least two, and the verification of the candidate calibration parameters based on the verification parameters includes:

[0165] S461. Compare the mean of at least two of the verification parameters with the candidate calibration parameters;

[0166] S462. If the difference between the mean and the candidate calibration parameter is less than the difference threshold, the verification passes.

[0167] In some embodiments, after comparing the mean of at least two of the verification parameters with the candidate calibration parameters, the method further comprises:

[0168] S463. If the difference between the mean and the candidate calibration parameter is greater than or equal to the difference threshold, the verification fails;

[0169] S464. Adjusting the candidate calibration parameters, and acquiring the test image and the reference image after each adjustment of the candidate calibration parameters;

[0170] For example: the mean value of the verification parameter is 0.144, and the value of the candidate calibration parameter is 0.14. If the difference between the two is greater than or equal to the difference threshold, such as greater than or equal to 0.004, 0.003, 0.002, etc., the calibration parameter is reversely adjusted according to the direction of the difference between the two.

[0171] In some embodiments, adjusting the candidate calibration parameters includes:

[0172] If the mean is smaller than the candidate calibration parameter, increasing the candidate calibration parameter;

[0173] If the mean is greater than the candidate calibration parameter, the candidate calibration parameter is reduced.

[0174] S465. When the test image and the reference image simultaneously satisfy the calibration image condition, determine the adjusted candidate calibration parameters as the calibration parameters of the naked-eye 3D display module.

[0175] It can be understood that when the adjusted candidate calibration parameters can satisfy both the optimal display effect of the image obtained at the target observation point and the optimal effect of the image obtained at the reference observation point, it indicates that the adjusted candidate calibration parameters are highly accurate.

[0176] In some embodiments, the characteristic parameters include lens width and / or fitting height, the lens width is the width of the cylindrical lens in the first direction of the display screen, the fitting height is the height of the center of the cylindrical lens relative to the light emitting surface of the display screen, and the adjusting of the candidate calibration parameters includes: adjusting the lens width and / or the fitting height.

[0177] It can be understood that the pixel period and offset have been calibrated through S10-S30. In order to reduce the workload of subsequent parameter adjustment, when performing parameter adjustment in S464, one or both of the lens width and / or the fitting height can be adjusted, so that the candidate calibration parameters of the naked-eye 3D display module after adjustment can be determined based on the corresponding relationship recorded in the above formula (1) and formula (2).

[0178] In order to further understand the linkage relationship when taking images at the reference observation point B, the target observation point A, and the reference observation point C, the following is combined with the attached Fig. 9 To Attachment Fig.11 Provide explanation.

[0179] See also Fig. 9 , showing a schematic diagram of the left and right view transition when adjusting the offset in an embodiment of the present disclosure.

[0180] like Fig. 9 As shown, the left view area is a black block and the right view area is a white block. In the process of adjusting the offset, in the first pupil distance cycle, that is, corresponding to the center of the display screen, the transition mode of the left and right views is black-gray-white; in the second left cycle, the transition mode of the left and right views is black-gray-white; in the second right cycle, the transition mode of the left and right views is white-gray-black, and so on, to simulate the display screen effect of the 3D display module observed by the human eye when moving.

[0181] See also Fig.10 , showing a schematic diagram of the parallax diamond area of ​​an embodiment of the present disclosure.

[0182] like Fig.10As shown, within the optimal observation point range of the naked-eye 3D display module, the target observation point A and the reference observation points B and C are set. A, B and C are arranged according to a specific pupil distance multiple relationship. The parallax diamond area can be determined based on the lens width and fitting height. ΔX represents the pupil distance value to simulate that during the movement of human eyes, the human eyes are always in two adjacent diamond areas, not in the same diamond area. Then, if the image is arranged at the center of the screen of the display, the light of the display will form multiple diamond areas after being emitted from the cylindrical lens. The human eyes are in two adjacent diamond areas respectively, thus forming different left and right views, and finally forming an interlaced effect.

[0183] See also Fig.11 , showing a comparison diagram of the reference image and the test image of an embodiment of the present disclosure.

[0184] like Fig.11 As shown, from left to right, the reference image collected at the reference observation point B, the test image collected at the target observation point A, and the reference image collected at the reference observation point C are shown. It can be seen that the images collected at each observation point satisfy that the area of ​​the left view area and the right view area are basically the same, and the color difference between the color block of the left view area and the color block of the right view area reaches the set color difference threshold.

[0185] In some embodiments, after determining the adjusted candidate calibration parameters as the calibration parameters of the naked-eye 3D display module, the method further includes:

[0186] A verification image is collected at at least one verification observation point, and the calibrated calibration parameters are verified according to the image display effect of the verification image.

[0187] The vertical distances of the verification observation point and the target observation point and / or the reference observation point relative to the display screen may be the same, and the verification observation point, the target observation point, and the reference observation point are located on the same straight line, which is parallel to the pixel row direction of the display screen. Thus, one or more verification images are collected at one or more verification observation points, and if one or more verification images meet the calibration image conditions, it indicates that the calibration parameters after calibration are highly accurate and the parameter calibration results are accurate.

[0188] See also Fig.12 , showing a structural diagram of a calibration device for a naked-eye 3D display module according to an embodiment of the present disclosure.

[0189] like Fig.12 As shown, a second aspect of the embodiment of the present disclosure provides a parameter calibration device 200 for a naked-eye 3D display module, wherein the naked-eye 3D display module includes a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen, and the device 200 includes:

[0190] An acquisition unit 201 is used to acquire a test image, wherein the test image is an image obtained by photographing a display screen of the naked-eye 3D display module at a target observation point at a fixed position through an image acquisition device, and the test image includes a left view area and a right view area corresponding to the display screen;

[0191] The first determination unit 202 is used to perform image processing on the test image and determine whether the test image meets a set calibration image condition, wherein the calibration image condition includes: the areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and the color difference between the first color block and the second color block is greater than or equal to a color difference threshold.

[0192] an adjusting unit 203, configured to adjust characteristic parameters of the naked-eye 3D display module if the test image does not meet the calibration image condition, and reacquire the test image based on the acquisition unit after the characteristic parameters are adjusted;

[0193] Wherein, the characteristic parameters include display parameters and lens parameters, and when the display parameters and / or the lens parameters are different, the acquired test images are different;

[0194] The second determining unit 204 is configured to determine the calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters when the acquired test image meets the calibration image condition.

[0195] Therefore, in the parameter calibration device of the naked-eye 3D display module provided by the embodiment of the present disclosure, during the entire parameter calibration process of the naked-eye 3D display module, the image acquisition device repeatedly captures the test image at the target observation point at a fixed position, without constantly changing the target observation point, and the operation is simple, and the device is more suitable for the production line calibration of the naked-eye 3D display module, such as the production line calibration at the module stage or the finished product stage; at the same time, by adjusting the characteristic parameters of the naked-eye 3D display module multiple times, the test image finally acquired includes a left view area (simulating the view observed by the left eye) and a right view area (simulating the view observed by the right eye) with basically the same area, and the color difference of the two view areas is greater than or equal to the color difference threshold, which is equivalent to the optimal image effect observed by the left eye and the right eye; different color blocks are used for arranging the images, so that the cumulative amount of the cylindrical lenses when arranged from the middle to both sides can be reduced, the crosstalk on the edges can be reduced, the image display effect can be improved, and the accuracy of the parameter calibration results can be improved.

[0196] Optionally, the acquiring unit 201 is specifically configured to:

[0197] Controlling the naked-eye 3D display module to display an initial picture based on preset parameters, wherein the preset parameters include preset feature parameters and preset coordinate parameters of the target observation point;

[0198] The test image is obtained by photographing the initial picture at the target observation point by the image acquisition device.

[0199] Optionally, when adjusting the characteristic parameters of the naked-eye 3D display module, the display parameters are adjusted before the lens parameters.

[0200] Optionally, the display screen includes a plurality of sub-pixels distributed in an array in a first direction and a second direction, and the display parameters include a pixel period; each cylindrical lens in the cylindrical lens array corresponds to at least one sub-pixel, and the lens parameters include an offset, which is an offset of an optical axis of the cylindrical lens relative to a central axis of the corresponding sub-pixel in the first direction.

[0201] Optionally, the target observation point and the naked-eye 3D display module are located in the same coordinate system, the coordinate system comprising a first coordinate axis and a second coordinate axis that are perpendicular to each other, the direction of the first coordinate axis is parallel to the first direction of the display screen, and the direction of the second coordinate axis is perpendicular to the light-emitting surface of the display screen; the target observation point and the center of the display screen have the same coordinates on the first coordinate axis.

[0202] Optionally, the second determining unit 204 is specifically configured to:

[0203] Determining candidate calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters;

[0204] Controlling the naked-eye 3D display module to display images based on the candidate calibration parameters and the coordinate parameters of the reference observation points;

[0205] Acquire a reference image, where the reference image is an image obtained by photographing a display screen of the naked-eye 3D display module at the reference observation point by the image acquisition device;

[0206] Adjusting the characteristic parameters based on the reference image, and reacquiring the reference image after each adjustment of the characteristic parameters;

[0207] In a case where the reference image satisfies the calibration image condition, using the adjusted characteristic parameters as verification parameters;

[0208] The candidate calibration parameters are verified based on the verification parameters, and if the verification passes, the candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

[0209] Optionally, there are at least two reference observation points, and the at least two reference observation points are evenly spaced on both sides of the target observation point, and the distance between the target observation point and the reference observation point and / or the distance between the two reference observation points is a multiple of the pupil distance of a human eye;

[0210] The corresponding verification parameters are at least two. When verifying the candidate calibration parameters based on the verification parameters, the second determination unit 204 is used to:

[0211] comparing the mean of at least two of the verification parameters with the candidate calibration parameters;

[0212] If the difference between the mean and the candidate calibration parameter is less than the difference threshold, the verification passes.

[0213] Optionally, the second determining unit 204 is further configured to:

[0214] If the difference between the mean and the candidate calibration parameter is greater than or equal to the difference threshold, the verification fails;

[0215] Adjusting the candidate calibration parameters, and acquiring the test image and the reference image after each adjustment of the candidate calibration parameters;

[0216] When the test image and the reference image simultaneously satisfy the calibration image condition, the adjusted candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

[0217] Optionally, when adjusting the candidate calibration parameters, the second determining unit 204 is used to:

[0218] If the mean is smaller than the candidate calibration parameter, increasing the candidate calibration parameter;

[0219] If the mean is greater than the candidate calibration parameter, the candidate calibration parameter is reduced.

[0220] Optionally, the characteristic parameters include lens width and / or fitting height, the lens width is the width of the cylindrical lens in the first direction of the display screen, and the fitting height is the height of the center of the cylindrical lens relative to the light emitting surface of the display screen. When adjusting the candidate calibration parameters, the second determining unit 204 is used to:

[0221] The lens width and / or the fitting height are adjusted.

[0222] Combination Figure 1A third aspect of the disclosed embodiment provides a parameter calibration system for a naked-eye 3D display module, comprising: a control device 3 and an image acquisition device 1 communicatively connected to the control device 3;

[0223] The image acquisition device 1 is located at the target observation point A and is used to acquire the test image. The image acquisition device 1 can be a camera, such as a monocular camera, a binocular camera, etc.;

[0224] The control device is used to communicate with the naked-eye 3D display module 2, and is used to execute the parameter calibration method of the naked-eye 3D display module 2 as described in any one of the first aspects.

[0225] Therefore, in the parameter calibration system of the naked-eye 3D display module provided by the embodiment of the present disclosure, during the entire parameter calibration process of the naked-eye 3D display module, the image acquisition device is used to capture test images multiple times at a target observation point at a fixed position, without constantly changing the target observation point, and the operation is simple, and the system is more suitable for production line calibration of the naked-eye 3D display module, such as production line calibration at the module stage or the finished product stage; at the same time, the control device is used to adjust the characteristic parameters of the naked-eye 3D display module multiple times, so that the test image finally acquired includes a left view area (simulating the view observed by the left eye) and a right view area (simulating the view observed by the right eye) with basically the same area, and the color difference of the two view areas is greater than or equal to the color difference threshold, which is equivalent to the optimal image effect observed by the left eye and the right eye; different color blocks are used to arrange the image, so that the cumulative amount of the cylindrical lens when arranged from the middle to both sides can be reduced, the crosstalk on the edge is reduced, the image display effect is improved, and the accuracy of the parameter calibration result is thereby improved.

[0226] In some embodiments, there are multiple image acquisition devices, one of which is located at the target observation point, and the other image acquisition devices are located at the reference observation point.

[0227] For example: taking the center of the display screen of the naked-eye 3D display module as the origin O, a two-dimensional coordinate system is established along the direction X of the first coordinate axis and the direction Z of the second coordinate axis. The image acquisition device 1 located at the target observation point has the same coordinate as the screen center of the display screen in the X-axis direction, that is, it is located on the Z-axis; multiple image acquisition devices are located on the same straight line, and the straight line is parallel to the light-emitting surface of the display screen.

[0228] For example: take the center of the display screen of the naked eye 3D display module as the origin O, establish a three-dimensional coordinate system along the direction X of the first coordinate axis, the direction Z of the second coordinate axis, and the direction Y of the third coordinate axis. The image acquisition device and the center of the screen of the display screen have the same coordinates in the X-axis direction, that is, the image acquisition device is located in the ZOY plane. For the convenience of analysis, the image acquisition device and the center of the screen in the Y-axis direction are further set to be the same, that is, the image acquisition device is located on the Z axis; multiple image acquisition devices are located on the same straight line, and the straight line is parallel to the light-emitting surface of the display screen.

[0229] In some embodiments, among the plurality of image acquisition devices, the spacing between each of the image acquisition devices is a multiple of the pupil distance of the human eye. For example, the spacing between the image acquisition device at the target observation point and the image acquisition device at the reference observation point is a multiple of the pupil distance of the human eye, or the spacing between the image acquisition devices at different reference observation points is a multiple of the pupil distance of the human eye. The pupil distance of the human eye can be 65 mm, and the multiple of the pupil distance of the human eye can be 65 mm, 130 mm, 195 mm, etc.

[0230] In some embodiments, the parameter calibration system of the naked-eye 3D display module is further provided with an adjustment mechanism (not shown), the image acquisition device is detachably arranged on the adjustment mechanism, the adjustment mechanism is provided with a slide rail, the length direction of the slide rail is parallel to the pixel row direction of the display screen, and a scale is provided on the slide rail. Thus, the image acquisition device can slide along the length direction of the slide rail, for example, according to the pupil distance of the human eye, to adjust the observation position of the naked-eye 3D display module, for example, when verifying the calibrated lens parameters, the observation position can be changed by moving the image acquisition device, and then the calibrated lens parameters can be verified based on the image acquired after the position change.

[0231] See also Fig.13 , showing a schematic diagram of a computer-readable storage medium in an embodiment of the present disclosure;

[0232] like Fig.13 As shown, based on the same inventive concept, an embodiment of the present disclosure provides a computer-readable storage medium 300, in which at least one computer program instruction is stored, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method described in any one of the third aspects.

[0233] The computer readable storage medium 300 may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium 300 of the present disclosure is not limited thereto, and in the present disclosure, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0234] The readable storage medium 300 may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the readable storage medium 300 include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0235] Program code for performing the operations of the present disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0236] See also Fig.14 , showing a schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present disclosure.

[0237] like Fig.14 As shown, the electronic device 400 is in the form of a general computing device. The components of the electronic device 400 may include but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0238] The storage unit stores program codes, which can be executed by the processing unit 410, so that the processing unit 410 executes the steps described in the above “Embodiment Method” section of this specification according to various exemplary embodiments of the present disclosure.

[0239] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache memory unit 422 , and may further include a read-only memory unit (ROM) 423 .

[0240] The storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0241] Bus 430 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0242] The electronic device 400 may also communicate with one or more external devices 500 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 450. Furthermore, the electronic device 400 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 460. As shown, the network adapter 460 communicates with other modules of the electronic device 400 via a bus 430. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0243] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0244] In the several embodiments provided in the present disclosure, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0245] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0246] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0247] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0248] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A parameter calibration method for a naked-eye 3D display module, characterized in that: The naked-eye 3D display module includes a display screen and a cylindrical lens array attached to a light-emitting surface of the display screen, and the method includes: Step 1: acquiring a test image, wherein the test image is an image obtained by photographing a display screen of the naked-eye 3D display module at a target observation point at a fixed position through an image acquisition device, and the test image includes a left view area and a right view area corresponding to the display screen; Step 2: performing image processing on the test image, and determining whether the test image meets a set calibration image condition, wherein the calibration image condition includes: the areas of the left view area and the right view area are substantially the same, the left view area includes a first color block, the right view area includes a second color block, and the color difference between the first color block and the second color block is greater than or equal to a color difference threshold; Step 3: If the test image does not meet the calibration image condition, the characteristic parameters of the naked-eye 3D display module are adjusted, and after the characteristic parameters are adjusted, the first step is returned to be executed; Executing the first step to the third step in a loop, wherein the characteristic parameters include display parameters and lens parameters, and when the display parameters and / or the lens parameters are different, the acquired test images are different; In a case where the acquired test image meets the calibration image condition, the calibration parameters of the naked-eye 3D display module are determined based on the adjusted characteristic parameters.

2. The method according to claim 1, characterized in that The obtaining of the test image comprises: Controlling the naked-eye 3D display module to display an initial picture based on preset parameters, wherein the preset parameters include preset feature parameters and coordinate parameters of the target observation point; The test image is obtained by photographing the initial picture at the target observation point by the image acquisition device.

3. The method according to claim 1, characterized in that When adjusting the characteristic parameters of the naked-eye 3D display module, the display parameters are adjusted before the lens parameters.

4. The method according to claim 1, characterized in that: The display screen includes a plurality of sub-pixels distributed in an array in a first direction and a second direction, and the display parameters include a pixel period; Each cylindrical lens in the cylindrical lens array corresponds to at least one sub-pixel, and the lens parameters include an offset, which is an offset of the optical axis of the cylindrical lens relative to the central axis of the corresponding sub-pixel in the first direction.

5. The method according to claim 1, characterized in that The method according to claim 1 is characterized in that the target observation point and the naked-eye 3D display module are located in the same coordinate system, the coordinate system includes a first coordinate axis and a second coordinate axis that are perpendicular to each other, the direction of the first coordinate axis is parallel to the first direction of the display screen, and the direction of the second coordinate axis is perpendicular to the light-emitting surface of the display screen; the target observation point and the center of the display screen have the same coordinates on the first coordinate axis.

6. The method according to any one of claims 1 to 5, characterized in that: The step of determining the calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters includes: Determining candidate calibration parameters of the naked-eye 3D display module based on the adjusted characteristic parameters; Controlling the naked-eye 3D display module to display images based on the candidate calibration parameters and the coordinate parameters of the reference observation points; Acquire a reference image, where the reference image is an image obtained by photographing a display screen of the naked-eye 3D display module at the reference observation point by the image acquisition device; Adjusting the characteristic parameters based on the reference image, and reacquiring the reference image after each adjustment of the characteristic parameters; In a case where the reference image satisfies the calibration image condition, using the adjusted characteristic parameters as verification parameters; The candidate calibration parameters are verified based on the verification parameters, and if the verification passes, the candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

7. The method according to claim 6, characterized in that There are at least two reference observation points, and the at least two reference observation points are evenly spaced on both sides of the target observation point. The distance between the target observation point and the reference observation point and / or the distance between the two reference observation points is a multiple of the pupil distance of a human eye. The corresponding verification parameters are at least two, and the verifying the candidate calibration parameters based on the verification parameters includes: comparing the mean of at least two of the verification parameters with the candidate calibration parameters; If the difference between the mean and the candidate calibration parameter is less than the difference threshold, the verification passes.

8. The method according to claim 7, characterized in that After comparing the mean of at least two of the verification parameters with the candidate calibration parameters, the method further includes: If the difference between the mean and the candidate calibration parameter is greater than or equal to the difference threshold, the verification fails; Adjusting the candidate calibration parameters, and acquiring the test image and the reference image after each adjustment of the candidate calibration parameters; When the test image and the reference image simultaneously satisfy the calibration image condition, the adjusted candidate calibration parameters are determined as the calibration parameters of the naked-eye 3D display module.

9. The method according to claim 7 or 8, characterized in that: The characteristic parameters also include lens width and fitting height, wherein the lens width is the width of the cylindrical lens in the first direction of the display screen, and the fitting height is the height of the center of the cylindrical lens relative to the light emitting surface of the display screen; The step of adjusting the candidate calibration parameters includes: The lens width and / or the fitting height are adjusted.

10. A parameter calibration system for a naked-eye 3D display module, characterized in that: include: A control device and an image acquisition device communicatively connected to the control device; The image acquisition device is located at the target observation point and is used to acquire the test image; The control device is used to communicate with the naked-eye 3D display module, and to execute the parameter calibration method of the naked-eye 3D display module as described in any one of claims 1-9.

Images