Parameter calibration device for naked eye 3D display device

Abstract

The application provides a parameter calibration device for a naked-eye 3D display device, an image acquisition module is moved through an acquisition position changing module, a plurality of calibration positions at which images meeting threshold requirements are acquired are determined during the moving process, simulation calculation is performed according to parameters of the plurality of calibration positions, and parameters of the naked-eye 3D display device to be calibrated are obtained. Through the method, the naked-eye 3D display device does not need to be disassembled, the cost of measurement is reduced, and full-automatic measurement is performed through the device, so that the labor cost of measurement is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D display, in particular to a parameter calibration device for naked eye 3D display device. BACKGROUND

[0002] Due to process limitations, the horizontal length of the prism and the height of the prism from the pixel of the naked eye 3D display device obtained by actual production inevitably do not conform to the design values, thereby affecting the overall 3D effect.

[0003] In the related art, to determine the actual optimal viewing position of the naked eye 3D display device, the naked eye 3D display device needs to be disassembled to measure the parameters of the whole machine, which has a high measurement cost. SUMMARY

[0004] Therefore, the present application aims to provide a parameter calibration device for naked eye 3D display device.

[0005] To achieve the above purpose, the present application provides a parameter calibration device for naked eye 3D display device, comprising:

[0006] An image generation module is configured to generate a calibration image and control the naked eye 3D display device to display the calibration image;

[0007] An image acquisition module is configured to acquire the calibration image displayed by the naked eye 3D display device to obtain an acquisition image;

[0008] An acquisition position changing module is configured to change the position of the image acquisition module when acquiring the acquisition image to obtain a plurality of acquisition images;

[0009] A parameter acquisition module is configured to determine at least one calibration position of the image acquisition module at which the acquisition image meets the calibration requirement, and acquire the parameters of the calibration position;

[0010] A parameter calibration module is configured to calibrate the parameters of the naked eye 3D display device according to the parameters of the plurality of calibration positions.

[0011] As can be seen from the above, the parameter calibration device for naked eye 3D display device provided by the present application moves the image acquisition module through the acquisition position changing module, determines a plurality of calibration positions at which the acquisition images meet the threshold requirement during the movement, and performs simulation calculation according to the parameters of the plurality of calibration positions to obtain the parameters of the naked eye 3D display device to be calibrated. Through the method, the naked eye 3D display device does not need to be disassembled, the cost of measurement is reduced, and the device is used for full-automatic measurement, thereby avoiding the labor cost of measurement. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute part of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0013] Figure 1 The structural block diagram of the parameter calibration device of the embodiment of the present application.

[0014] Figure 2 The structural schematic diagram of the acquisition position changing module of the embodiment of the present application.

[0015] Figure 3 The MAE calculation result diagram obtained by the parameter calibration module of the embodiment of the present application.

[0016] Figure 4 The shooting effect diagram of the naked-eye 3D display device calibrated by the parameter calibration device of the embodiment of the present application.

[0017] The reference signs in the drawings include: an image generation module 1, an image acquisition module 2, an acquisition position changing module 3, a parameter acquisition module 4, a parameter calibration module 5, a horizontal moving assembly 301, a vertical moving assembly 302, and a support 303. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the embodiments and the drawings.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meanings understood by those skilled in the art. The words such as “include” or “contain” mean that the elements or objects appearing before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects. The words such as “connect” or “connected” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0020] With the rise of the meta-universe technology, the popularity of naked-eye 3D is gradually rising. As the name implies, naked-eye 3D is a technology that can reproduce a stereoscopic image with spatial depth information without the viewer wearing any visual aid equipment. Among all the naked-eye 3D display methods, the lenticular lens grating naked-eye 3D display occupies an important position in the naked-eye 3D market and is one of the key research and development fields of naked-eye 3D technology, due to its small picture brightness loss, less moire effect and small loss of image resolution in all directions.

[0021] However, in the development of the lenticular lens grating naked eye 3D, due to the process problem, the horizontal length (pitch) of the prism and the height (h) of the prism distance pixel in the whole machine inevitably do not conform to the design value, resulting in that the actual optimal viewing distance does not conform to the theoretical value calculated according to the design value, affecting the accuracy of the image synthesis and the human eye tracking linkage, and will affect the overall 3D effect.

[0022] Therefore, the parameters of the naked eye 3D display device need to be calibrated to determine the actual pitch and h value, so as to obtain a theoretical optimal viewing distance closer to the actual optimal viewing distance. However, in the related art, when determining the parameters of the naked eye 3D display device, the whole machine needs to be disassembled to measure the parameters of the whole machine, and the measurement cost is high.

[0023] In view of the above shortcomings of the related art for measuring the parameters of the naked eye 3D display device, the embodiments of the present application provide a parameter calibration device for a naked eye 3D display device.

[0024] The parameter calibration device for a naked eye 3D display device provided by the present application moves the image acquisition module through the acquisition position changing module, determines the calibration positions of a plurality of images meeting the threshold requirement in the moving process, and performs simulation calculation according to the parameters of the plurality of calibration positions to obtain the parameters of the naked eye 3D display device to be calibrated. Through the method, the machine does not need to be disassembled, the cost of measurement is reduced, and the full-automatic measurement is realized through the device, so that the labor cost of measurement is avoided.

[0025] Figure 1 The structure of the parameter calibration device of the embodiments of the present application is shown.

[0026] As shown in Figure 1 The embodiments of the present application provide a parameter calibration device for a naked eye 3D display device, which comprises:

[0027] An image generation module 1 is configured to generate a calibration image and control the naked eye 3D display device to display the calibration image.

[0028] In the embodiment, the image generation module 1 can generate the calibration image by an image generation algorithm, which calculates the parameters of the calibration image by the parameters of the to-be-calibrated naked-eye 3D display device, so as to generate the calibration image. The parameters of the to-be-calibrated naked-eye 3D display device can include fixed parameters and variable parameters, the fixed parameters being the parameters of the to-be-calibrated naked-eye 3D display device determined when the production is completed, such as the number of viewpoints and the prism tilt angle. The number of viewpoints is the number of viewpoints that can enable the viewer to observe the best 3D effect on a plane at a certain distance from the to-be-calibrated naked-eye 3D display device, and the prism tilt angle is the prism angle of the to-be-calibrated naked-eye 3D display device. The variable parameters can include the mapping period, which can be changed during the use of the naked-eye 3D display device to adjust the distance at which the viewer observes the best 3D effect. Because different mapping periods correspond to different optimal viewing distances, when the specific parameter calibration is performed using the embodiment, a range of the design optimal viewing distance (for example, 450 cm to 1200 cm) of the naked-eye 3D display device can be selected, a plurality of distance values in the range are selected, a plurality of mapping periods are calculated according to the distance values, and a corresponding number of calibration images are generated according to the plurality of mapping periods.

[0029] In this way, the image generation module 1 generates the calibration image that can be used for parameter calibration according to the known actual parameters of the to-be-calibrated naked-eye 3D display device, and the remaining modules can perform parameter calibration according to the calibration image to determine the value of the to-be-calibrated parameter of the to-be-calibrated naked-eye 3D display device.

[0030] It is considered that in the calibration process, the parameter used for calibration needs to be clearly determined according to the calibration image.

[0031] As an optional embodiment, the calibration image can include a plurality of black-and-white images arranged in an array. Each black-and-white image includes a black image and a white image, and the black image and the white image are arranged left and right to form a black-and-white image.

[0032] The naked-eye 3D display device needs to be calibrated according to the 3D display effect, and the 3D display effect is specifically manifested as the mixing degree of the left and right images of the calibration image in the calibration process. When the left and right images observed do not mix at all, the best 3D display effect can be obtained, so the left and right images of the calibration image need to be images that can accurately determine the mixing effect.

[0033] In the embodiment, the left and right images of the black and white image are mixed to obtain a 3D image, and the left and right images of the captured image at the non-calibration position are black images with a partial white area or white images with a partial black area when the 3D image is captured by the image capturing module. The white area in the black image or the black area in the white image will affect the average gray value of the image, so the mixing degree of the left and right images can be determined according to the gray value, and the 3D display effect of the calibration image at this time can be accurately determined.

[0034] In the embodiment, the size of each black and white image is the same, and is a value obtained according to the layout period. In one black and white image, the black image and the white image each account for half of the black and white image, and are interlaced into a 3D image by an image synthesis algorithm. The generated black and white image can be a black image on the left and a white image on the right, or a white image on the left and a black image on the right, and the two composition modes have no effect on the calibration result. In the embodiment, the generated black and white image is a black image on the left and a white image on the right.

[0035] In this way, by taking the black and white image as the calibration image, the mixing degree of the left and right images can be determined, the 3D display effect of the calibration image at this time can be determined, and the parameters for calibration can be accurately determined.

[0036] The image capturing module 2 is configured to capture the calibration image displayed by the naked-eye 3D display device to be calibrated to obtain a captured image.

[0037] In the embodiment, the image capturing module 2 captures the calibration image to obtain a captured image reflecting the actual display effect of the calibration image, and then determines the 3D display effect of the captured image, i.e., whether the display effect of the calibration image at this time meets the calibration requirement. The parameters of the captured image meeting the calibration requirement are the parameters for calibration.

[0038] As an optional embodiment, the image capturing module 2 includes a binocular camera.

[0039] The 3D display effect is for an observer, and the observer is usually an adult human. Therefore, the image capturing module 2 needs to simulate the binocular vision of an adult human to make the captured image close to the image seen by the binocular vision of an adult human. Therefore, the image capturing module 2 needs to include two lenses to simulate the binocular vision of a human, and the distance between the two lenses needs to be the distance between the binocular vision of an adult human (about 65 mm) to simulate the binocular vision of an adult human.

[0040] In this embodiment, the binocular camera with lens spacing equal to the binocular spacing of an adult human is selected as the image acquisition module 2, which meets the requirement of simulating the binoculars of an adult human, and the fixed spacing between the two lenses of the binocular camera can avoid the change in the spacing between the two monocular cameras when the image acquisition module 2 is composed of two monocular cameras, which leads to calibration error.

[0041] The acquisition position changing module 3 is configured to change the position of the image acquisition module 2 during image acquisition to obtain a plurality of acquisition images.

[0042] In this embodiment, the image acquisition module 2 is moved by the acquisition position changing module 3 to change the position of the image acquisition module 2 during image acquisition. The image acquisition module 2 continuously acquires images during movement to obtain a plurality of acquisition images and the position of the image acquisition module 2 during acquisition of the images.

[0043] In this way, among the plurality of combinations obtained by the acquisition position changing module 3, when the acquisition image meets the calibration requirement, the position of the image acquisition module 2 at this time can be conveniently obtained, which is the calibration position.

[0044] Considering that the position of the image acquisition module 2 needs to be determined and recorded during movement of the image acquisition module 2, the acquisition position changing module 3 needs to drive the image acquisition module 2 to move vertically and parallel to the to-be-calibrated naked-eye 3D device.

[0045] Figure 2 The structure of the acquisition position changing module 3 of the embodiment of the application is shown.

[0046] As shown in Figure 2 As an optional embodiment, the acquisition position changing module 3 includes a horizontal moving assembly 301, a vertical moving assembly 302, and a support 303. The image acquisition module 2 is connected and fixed with the horizontal moving assembly 301, the horizontal moving assembly 301 is slidably connected with the vertical moving assembly 302, and the vertical moving assembly 302 is slidably connected with the support 303.

[0047] In this embodiment, the vertical moving assembly 302 and the support 303 can be a sliding block and sliding rail structure, that is, the vertical moving assembly 302 slides on the sliding rail structure of the support 303 as a sliding block. The horizontal moving assembly 301 and the vertical moving assembly 302 can be a sliding block and sliding rail structure, that is, the horizontal moving assembly 301 slides on the sliding rail structure of the vertical moving assembly 302 as a sliding block. Moreover, the motion trajectory of the vertical moving assembly 302 and the motion trajectory of the horizontal moving assembly 301 are perpendicular to each other.

[0048] In practice, the naked-eye 3D display device to be calibrated is arranged at one end of the support 303, and the display panel of the naked-eye 3D display device to be calibrated is parallel to the movement track of the horizontal movement assembly 301, so as to ensure that the image acquisition module 2 moves vertically and horizontally accurately under the action of the acquisition position changing module 3.

[0049] In this way, the image acquisition module 2 moves vertically and horizontally under the action of the acquisition position changing module 3, so that the position of the image acquisition module 2 obtained only contains two parameters of vertical distance and horizontal distance, and the parameter values are obtained conveniently.

[0050] When the image acquisition module 2 moves under the action of the acquisition position changing module 3 to determine the calibration position, the movement speed needs to be limited to ensure that the acquisition image obtained by the image acquisition module 2 is clear and free of ghosting. However, if the movement is performed at a limited movement speed throughout the calibration process, a large amount of time will be consumed, and therefore it is necessary to increase the movement speed of the acquisition position changing module 3 as much as possible to reduce the time consumed in the calibration process while ensuring that the acquisition image is clear.

[0051] As an optional embodiment, the acquisition position changing module 3 is configured to include a low-precision movement mode and a high-precision movement mode.

[0052] When the plurality of calibration positions are determined, the acquisition position changing module 3 first determines a first region in which the left acquisition image and the right acquisition image of the acquisition image satisfy the second threshold value by using the low-precision movement mode, and then determines the calibration position in the first region by using the high-precision movement mode.

[0053] In this embodiment, when the acquisition position changing module 3 is in the low-precision movement mode, the movement speed of the image acquisition module 2 is fast, and at this time, the clarity of the acquisition image obtained by the image acquisition module 2 is low, and there may be defects such as ghosting that affect the image quality, but the fuzzy range of the calibration position, i.e., the first region, can be determined according to the acquisition image. When the acquisition position changing module 3 is in the high-precision movement mode, the movement speed of the image acquisition module 2 is slow, and at this time, the clarity of the acquisition image obtained by the image acquisition module 2 is high, and the acquisition image can be used to determine the accurate position of the calibration position. For example, in some embodiments, when the acquisition position changing module 3 is in the low-precision movement mode, the image acquisition module 2 can move vertically by 50 mm or horizontally by 10 mm within a set fixed time, and when the acquisition position changing module 3 is in the high-precision movement mode, the image acquisition module 2 can move vertically by 5 mm or horizontally by 1 mm within the set fixed time, i.e., the movement speed of the acquisition position changing module 3 in the low-precision movement mode is ten times the movement speed of the acquisition position changing module 3 in the high-precision movement mode.

[0054] In implementation, the captured images can include a left captured image in black and a right captured image in white. A brightness value representing the brightness of the captured images can be obtained by calculating the difference between the average gray value of the right captured image and the average gray value of the left captured image. The greater the brightness value, the greater the difference between the left captured image and the right captured image, and the closer the left captured image to pure black (i.e. the gray value is the minimum value, usually 0) and the closer the right captured image to pure white (i.e. the gray value is the maximum value, usually 255). The greater the brightness value, the smaller the mixing degree of the captured images, and the better the 3D effect of the naked-eye 3D display device observed at the position of the image capturing module 2 corresponding to the captured images.

[0055] In this way, the captured position changing module 3 first determines the first area in which the calibration positions exist by using the low-precision moving mode with high moving speed, and then determines the accurate positions of the calibration positions in the first area by using the high-precision moving mode with low moving speed. On the premise of accurately determining the calibration positions, the consumption time of the calibration process is reduced, and the calibration efficiency is improved.

[0056] As another optional embodiment, when the plurality of calibration positions are determined, the captured position changing module 3 first determines the first area in which the change trend of the features of the left captured image and the right captured image of the captured images is changed by using the low-precision moving mode, and then determines the calibration positions in the first area by using the high-precision moving mode.

[0057] In this embodiment, the remaining parts are the same as those in the previous embodiment, and the difference lies in that the first area is determined by the change trend of the feature value. For example, when the feature is brightness, the adjacent position of the position at which the change trend of the brightness of the adjacent captured images changes from increasing to decreasing is taken as the first area. At this time, the size of the first area can be pre-set.

[0058] In this way, when the first area is determined, accurate calculation can not be performed, and the first area can be determined only by fuzzy judgment, so that the calibration efficiency is further improved.

[0059] The parameter acquisition module 4 is configured to determine at least one calibration position of the image capturing module 2 when the captured images meet the calibration requirements, and acquire the parameters of the calibration position.

[0060] As an optional embodiment, the parameter acquisition module 4 is configured to determine the calibration position by the following method:

[0061] The left captured image and the right captured image included in the captured images are respectively subjected to gray value processing to obtain the average gray value of the left captured image and the right captured image after the gray value processing.

[0062] calculating an absolute value of a difference between the average gray scale values of the left captured image and the right captured image.

[0063] In response to the absolute value of the difference between the average gray scale values satisfying a first threshold value, determining that the position of the image capturing module 2 when the captured image is captured is a calibration position.

[0064] In the embodiment, the captured image is converted into a gray scale image through the gray scale processing, and the features of the captured image are converted into a single feature of the gray scale value, so that the mixing degree of the captured image can be determined through the gray scale value, and the position of the image capturing module 2 corresponding to the captured image can be determined to observe the 3D effect of the naked eye 3D display device to be calibrated. The brightness value of the captured image is obtained by calculating the absolute value of the difference between the average gray scale values of the left captured image and the right captured image, and the greater the numerical value of the brightness value, the better the 3D effect of the naked eye 3D display device to be calibrated observed by the position of the image capturing module 2 corresponding to the captured image. For example, when the maximum value of the gray scale value is 255, the first threshold value can be 247, that is, the position of the image capturing module 2 corresponding to the captured image with the brightness value greater than 247 is the calibration position.

[0065] In specific implementation, before the gray scale processing is performed, the coordinates of the four corners of the naked eye 3D display device to be calibrated in the captured image can be extracted according to a preset label, and then the background environment outside the display screen of the naked eye 3D display device to be calibrated is removed from the captured image through perspective transformation to obtain the captured image including only the display screen. The preset label can be a label (for example, a red label) fixed to the four corners of the naked eye 3D display device to be calibrated, or an image (for example, a red image) of the four corners of the calibration image. In this way, by removing the background environment, the interference of the background environment is avoided, thereby reducing the influence of the background environment on the average gray scale value of the captured image, and making the calculation of the average gray scale value of the captured image more accurate.

[0066] In this way, by comparing the gray scale value of the captured image with the first threshold value, it is determined whether the 3D effect of the naked eye 3D display device to be calibrated observed by the position of the image capturing module 2 corresponding to the captured image satisfies the calibration requirement, and the position of the image capturing module 2 satisfying the calibration requirement is taken as the calibration position for subsequent calibration.

[0067] As another optional embodiment, after the absolute value of the difference between the average gray scale values of the left captured image and the right captured image is calculated, the captured image in which the change trend of the absolute value changes is determined, and the position of the image capturing module 2 when the captured image is captured is the calibration position.

[0068] In the embodiment, the determination basis for determining the calibration position is the same as that in the previous embodiment. In the embodiment, the calibration position corresponding to the captured image is determined by the trend of the absolute value calculated from the adjacent captured images.

[0069] In this way, the turning point is determined instead of the value comparison in the previous embodiment. Different image capture modules 2 can have different performance, so that the gray value of the image captured by different image capture modules 2 at the same capture position can be different. Therefore, in the previous embodiment, different first thresholds need to be set for different image capture modules 2. In the embodiment, the method of determining the turning point of the trend is used to determine the calibration position corresponding to the captured image for different image capture modules 2, which is more universal and can be adapted to all image capture modules 2.

[0070] As an optional embodiment, the parameter acquisition module 4 can include a displacement measurement component and a distance measurement component.

[0071] The displacement measurement component is fixedly connected with the horizontal movement component 301, and the distance measurement component is fixedly connected with the vertical movement component 302.

[0072] In this way, the displacement of the horizontal movement component 301, i.e., the horizontal distance, can be measured by the displacement measurement component, and the distance between the vertical movement component 302 and the naked-eye 3D display device to be calibrated, i.e., the vertical distance, can be measured by the distance measurement component.

[0073] As an optional embodiment, the displacement measurement component can include a displacement sensor. The distance measurement component can include a laser range finder.

[0074] In this way, the distance between the image capture module 2 and the naked-eye 3D display device to be calibrated can be measured in real time by the displacement sensor and the laser range finder, avoiding errors caused by the movement of the image capture module 2.

[0075] The parameter calibration module 5 is configured to calibrate the parameters of the naked-eye 3D display device to be calibrated according to the parameters of the plurality of calibration positions.

[0076] In this way, the parameters of the naked-eye 3D display device to be calibrated are calibrated by the parameters of the calibration positions, so that the calibrated parameters of the naked-eye 3D display device to be calibrated conform to the actual situation.

[0077] As an optional embodiment, the parameter calibration module 5 is configured to select a group of parameters closest to the calibration position from a plurality of groups of preset parameters as the parameters of the naked-eye 3D display device to be calibrated.

[0078] When calibrating the parameters of the to-be-calibrated naked-eye 3D display device according to the parameters of the calibration position, multiple measurements can be performed according to a single calibration image to obtain multiple sets of calibration position parameters, the parameters of the multiple sets of calibration positions are averaged, and the parameters of the to-be-calibrated naked-eye 3D display device are calculated according to the average value to obtain the final calibrated parameters of the to-be-calibrated naked-eye 3D display device. The simulation method can also be used to generate the parameters of the to-be-calibrated naked-eye 3D display device, and the simulation position (i.e., the theoretical target position) corresponding to the simulation parameters is calculated to determine a set of simulation parameters that is closest to the calibration position among the multiple sets of simulation parameters, and the final calibrated parameters of the to-be-calibrated naked-eye 3D display device are the final calibrated parameters of the to-be-calibrated naked-eye 3D display device.

[0079] Both of the two calculation methods can obtain the calibration parameters of the to-be-calibrated naked-eye 3D display device. The first method directly obtains the calibration parameters according to a single calibration image, has a smaller calculation amount, and can quickly calibrate the parameters. The second method is a simulation method, which calculates the theoretical effect according to multiple sets of simulation data, finds the theoretical effect that is closest to the actual effect, i.e., the theoretical effect that has the smallest error with the actual effect, and determines the simulation parameters corresponding to the theoretical effect as the calibration parameters. In addition, multiple calibration positions are considered in the calibration process to make the calibrated parameters conform to multiple positions.

[0080] In this embodiment, the preset parameters are obtained through a parameter network, and the parameter network is determined according to an estimated range of the parameters of the to-be-calibrated naked-eye 3D display device. For example, in some embodiments, the parameters of the to-be-calibrated naked-eye 3D display device include the horizontal length of the prism and the height of the prism from the pixel, and the estimated range can be within 10% of the design parameters of the to-be-calibrated naked-eye 3D display device. The difference in the horizontal length of the prism between nodes in the network can be 100 nanometers, and the difference in the height of the prism from the pixel can be 10 millimeters. Multiple sets of preset parameters are obtained by extracting the parameters of each node in the network.

[0081] In this way, by selecting a set of parameters in the preset parameters that is closest to the calibration position as the parameters of the to-be-calibrated naked-eye 3D display device, the calculation amount in the calibration process is small, and the efficiency of the calibration process is high.

[0082] As an optional embodiment, the parameter calibration module 5 is configured to select a set of parameters in the preset parameters that is closest to the calibration position as the parameters of the to-be-calibrated naked-eye 3D display device by the following method:

[0083] According to each set of preset parameters, the corresponding theoretical target position parameters are calculated, and the specific formula is as follows:

[0084]

[0085]

[0086] wherein deltax is the arrangement period of the calibration image, pitch is the horizontal length of the prism in the preset parameter, h is the height of the prism from the pixel in the preset parameter, H' is the theoretical target vertical distance corresponding to pitch and h, and x' is the theoretical target horizontal distance corresponding to pitch and h.

[0087] The error between the theoretical target position parameter corresponding to each preset parameter and the parameter of the calibration position is calculated, and the specific formula is as follows:

[0088]

[0089] wherein MAE is the mean absolute error, n is the number of the calibration positions, H i is the actual target vertical distance of the i-th calibration position, x i is the actual target horizontal distance of the i-th calibration position, and a is a weight correction factor, and the value of a is dimensionless. i i

[0090] The preset parameter with the minimum error is selected as the parameter of the bare-eye 3D display device to be calibrated.

[0091] In this embodiment, the corresponding theoretical target position parameter (i.e. the theoretical optimal position parameter) is calculated according to the preset parameter, and then the mean absolute error between the theoretical target position parameter and the actual target position parameter (i.e. the actual target position parameter) of the calibration position is calculated. The mean absolute error represents the error between the preset parameter and the actual parameter of the bare-eye 3D display device to be calibrated, and thus the preset parameter with the minimum mean absolute error can be used as the calibration parameter of the bare-eye 3D display device to be calibrated.

[0092] In this way, the calibration parameter of the bare-eye 3D display device to be calibrated can be determined from the preset parameters by calculating the mean absolute error of each preset parameter.

[0093] Figure 3 A MAE calculation result diagram obtained by the parameter calibration module 5 of the embodiment of the present application is shown.

[0094] As can be seen from the diagram, different preset parameters (i.e. points in the XY plane in the diagram) have different mean absolute errors (i.e. the Z values corresponding to the points in the XY plane in the diagram), wherein the preset parameter with the minimum mean absolute error is the parameter of the bare-eye 3D display device to be calibrated after final calibration.

[0095] Figure 4 A shooting effect diagram of the bare-eye 3D display device calibrated by the parameter calibration device of the embodiment of the present application is shown.​​

[0096] After the parameter calibration device of the embodiment calibrates the to-be-calibrated naked-eye 3D display device, the calibration parameters of the to-be-calibrated naked-eye 3D display device are obtained, and the theoretical optimal observation positions of the to-be-calibrated naked-eye 3D display device are calculated according to the calibration parameters, obtaining three theoretical optimal observation positions A, B and C. Then, the binocular camera is used to take pictures at the three theoretical optimal observation positions, and the images are obtained as shown in the figure. As can be seen from the figure, the left image obtained by the taking is a full black image with very low brightness, and the right image is a full white image with very high brightness, which can determine that the three theoretical optimal observation positions are the actual optimal observation positions. Therefore, it can be determined that the parameter calibration device provided in the embodiment can accurately calibrate the parameters of the naked-eye 3D display device.

[0097] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of the present application (including claims) to these examples; the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in details.

[0098] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0099] The embodiments of the present application are intended to cover all such alternatives, modifications and variations as falling within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the present application.

Claims

1. A parameter calibration device for a naked-eye 3D display device, characterized in that, The method comprises the following steps: An image generation module is configured to generate a calibration image and control a to-be-calibrated naked-eye 3D display device to display the calibration image; An image acquisition module is configured to acquire the calibration image displayed by the to-be-calibrated naked-eye 3D display device to obtain an acquired image; An acquisition position changing module is configured to change a position at which the acquired image is acquired to obtain a plurality of acquired images; A parameter acquisition module is configured to determine at least one calibration position of the image acquisition module at which the acquired image meets a calibration requirement and acquire a parameter of the calibration position; A parameter calibration module is configured to calibrate a parameter of the to-be-calibrated naked-eye 3D display device according to parameters of a plurality of calibration positions; The parameter calibration module is configured to select, from a plurality of groups of preset parameters, a group of theoretical target positions closest to the calibration positions as the parameter of the to-be-calibrated naked-eye 3D display device; The parameter calibration module is configured to select, from a plurality of groups of preset parameters, a group of theoretical target positions closest to the calibration positions as the parameter of the to-be-calibrated naked-eye 3D display device by the following method: Calculate a corresponding theoretical target position parameter according to each group of preset parameters; Calculate an error between the theoretical target position parameter corresponding to each group of preset parameters and the parameter of the calibration position; Select a group with the smallest error as the parameter of the to-be-calibrated naked-eye 3D display device; The parameter calibration module is configured to calculate a corresponding theoretical target position parameter according to each group of preset parameters by the following formula: Wherein, deltax is a layout period of the calibration image, pitch is a horizontal length of a prism in the preset parameter, h is a height of the prism from a pixel in the preset parameter, H' is a theoretical target vertical distance corresponding to pitch and h, and x' is a theoretical target horizontal distance corresponding to pitch and h.

2. The parameter calibration device according to claim 1, characterized in that The parameter acquisition module is configured to determine the calibration position by the following method: Perform grayscale processing on a left acquired image and a right acquired image included in the acquired image to obtain average grayscale values of the left acquired image and the right acquired image after grayscale processing; Calculate an absolute value of a difference between the average grayscale values of the left acquired image and the right acquired image; In response to the absolute value of the difference between the average grayscale values meeting a first threshold value, determine that the position of the image acquisition module at which the acquired image is acquired is the calibration position.

3. The parameter calibration apparatus according to claim 2, characterized by The acquisition position changing module is configured to include a low-precision movement mode and a high-precision movement mode; When a plurality of calibration positions are determined, the acquisition position changing module first uses the low-precision movement mode to determine a first region in which the left acquired image and the right acquired image meet a second threshold value, and then uses the high-precision movement mode to determine the calibration position in the first region.

4. The parameter calibration device of claim 1, wherein The parameter calibration module is configured to calculate an error between the theoretical target position parameter corresponding to each group of preset parameters and the parameter of the calibration position by the following formula: wherein MAE is the mean absolute error, n is the number of the calibration positions, H i is the actual target vertical distance of the i-th calibration position, x i is the actual target horizontal distance of the i-th calibration position, and a is a weight correction factor, which has a value of i the dimension of x i the dimension of H.

5. The parameter calibration device of claim 1, wherein The calibration image comprises a plurality of black-and-white images arranged in an array.

6. The parameter calibration apparatus according to claim 1, characterized by The image acquisition module comprises a binocular camera.

7. The parameter calibration device of claim 1, wherein The collection position changing module comprises a horizontal moving assembly, a vertical moving assembly and a support; The image collection module is fixedly connected with the horizontal moving assembly, the horizontal moving assembly is slidably connected with the vertical moving assembly, and the vertical moving assembly is slidably connected with the support.

8. The parameter calibration apparatus according to claim 7, characterized by The parameter acquisition module comprises a displacement measuring assembly and a distance measuring assembly. The displacement measuring assembly is fixedly connected with the horizontal moving assembly, and the distance measuring assembly is fixedly connected with the vertical moving assembly.

9. The parameter calibration apparatus according to claim 8, characterized by The displacement measuring assembly comprises a displacement sensor, and the distance measuring assembly comprises a laser range finder.

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