Focus adjustment method and apparatus

Abstract

The application provides a focusing adjustment method and device. The method comprises the following steps: acquiring a first image obtained by a light measurement device (LMD) taking a focusing test image displayed on a first display panel, wherein the focusing test image comprises a two-dimensional MTF test pattern and a face pattern; automatically focusing the LMD according to the two-dimensional MTF test pattern in the first image; and adjusting a focusing ring of the LMD according to the face pattern, so that the LMD is in a slightly defocused state of the face pattern, wherein the slightly defocused state of the face pattern is that the first display panel grid points and moire in the first image are invisible, and the face pattern is clearly visible. Through the application, the LMD can quickly reach the slightly defocused state, so that a screen image capable of accurately extracting the brightness of each pixel of the screen body is quickly obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display panel, and particularly relates to a focusing adjustment method and device. BACKGROUND

[0002] Display panels represented by liquid crystal displays (LCD) and organic light-emitting diode displays (OLED) are increasingly popular in people's lives. However, display panels undergo many process flows in the preparation process, and each step of the process flow can introduce defects and defects, which ultimately affect the yield of the display panel and increase the cost, so it is necessary to use LMD (Luminance Measuring Device, light measuring device, generally an industrial camera or a face array brightness meter) to take pictures and detect the display panel in the production process.

[0003] Two typical purposes of using LMD to take pictures of the display panel are AOI detection and DeMura, and both LMD application scenarios need to accurately extract the brightness of each pixel of the screen body based on the screen body image taken by the LMD. Based on this, how to make the LMD quickly obtain the screen body image which can accurately extract the brightness of each pixel of the screen body is a technical problem to be solved. SUMMARY

[0004] The main purpose of the present application is to provide a focusing adjustment method and device, which aims to solve the technical problem of how to make the LMD quickly obtain the screen body image which can accurately extract the brightness of each pixel of the screen body.

[0005] In a first aspect, the present application provides a focusing adjustment method, which comprises:

[0006] obtaining a first image taken by a light measuring device (LMD) on a focus test image displayed on a first display panel, the focus test image comprising a two-dimensional MTF test pattern and a face pattern;

[0007] automatically focusing the LMD according to the two-dimensional MTF test pattern in the first image;

[0008] adjusting the focusing ring of the LMD according to the face pattern, so that the LMD is in a slightly out-of-focus state of the face pattern, and the first image is invisible to the first display panel grid and moire, and the face pattern is clearly visible.

[0009] Optionally, after the step of automatically focusing the LMD according to the two-dimensional MTF test pattern in the first image, the method further comprises:

[0010] detecting whether the automatic focusing is correct;

[0011] If the auto-focusing is correct, the step of adjusting the focus ring of the LMD is performed.

[0012] Optionally, the step of detecting whether the auto-focusing is correct comprises:

[0013] A new first image is obtained by taking a picture of the focus test image displayed on the first display panel after the auto-focusing.

[0014] It is detected whether the face pattern in the new first image is the face pattern taken when the LMD is in the sharp focus state.

[0015] If the face pattern in the new first image is the face pattern taken when the LMD is in the sharp focus state, it is determined that the auto-focusing is correct.

[0016] If the face pattern in the new first image is not the face pattern taken when the LMD is in the sharp focus state, it is determined that the auto-focusing is incorrect.

[0017] Optionally, after the step of detecting whether the auto-focusing is correct, the method further comprises:

[0018] If the auto-focusing is incorrect, the step of obtaining the first image taken by the LMD of the focus test image displayed on the first display panel is returned.

[0019] Optionally, the step of adjusting the focus ring of the LMD comprises:

[0020] The focus ring of the LMD is adjusted in response to the adjustment operation, and during the adjustment process, an image taken by the LMD of the face pattern in the focus test image in real time is displayed on the second display panel.

[0021] Optionally, a plurality of the two-dimensional MTF test patterns and the face pattern are displayed at a plurality of different positions on the first display panel.

[0022] Optionally, the first display panel has the two-dimensional MTF test pattern and the face pattern at the center and the four corners of the screen body.

[0023] Optionally, the two-dimensional MTF test pattern has a plurality of spatial frequencies, and the two-dimensional MTF test pattern is obtained by intersecting horizontal and vertical bar patterns with different spatial frequencies.

[0024] Optionally, the two-dimensional MTF test from the center to the edge is low frequency, medium frequency and high frequency in turn.

[0025] In a second aspect, the present application further provides a focus adjustment device, the focus adjustment device comprising:

[0026] An acquisition module is configured to acquire a first image obtained by a light measurement device (LMD) from a focus test image displayed on a first display panel, the focus test image comprising a two-dimensional MTF test pattern and a face pattern;

[0027] An auto-focusing module is configured to automatically focus the LMD according to the two-dimensional MTF test pattern in the first image;

[0028] An adjustment module is configured to adjust a focusing ring of the LMD so that the LMD is in a slightly defocused state of the face pattern, the slightly defocused state of the face pattern being that the first display panel grid points and moire patterns in the first image are invisible, and the face pattern is clearly visible.

[0029] In the present application, the first image obtained by the light measurement device (LMD) from the focus test image displayed on the first display panel is acquired, the focus test image comprising a two-dimensional MTF test pattern and a face pattern; the LMD is automatically focused according to the two-dimensional MTF test pattern in the first image; and the focusing ring of the LMD is adjusted according to the face pattern so that the LMD is in a slightly defocused state of the face pattern, the slightly defocused state of the face pattern being that the first display panel grid points and moire patterns in the first image are invisible, and the face pattern is clearly visible. Since the display panel has the characteristic of periodic light-emitting discrete pixel point arrangement, the LMD needs to be in a slightly defocused state to take an image of the screen image on the first display panel to avoid or weaken moire when performing AOI detection and DeMura on the first display panel. Through the present application, the LMD is first automatically focused based on the two-dimensional MTF test pattern, and the focusing ring of the LMD is further adjusted when the automatic focusing of the LMD is completed, so that the LMD can quickly reach a slightly defocused state, thereby quickly obtaining a screen image that can accurately extract the brightness of each pixel on the first display panel. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a flowchart of the focus adjustment method of an embodiment of the present application;

[0031] Figure 2 It is a schematic diagram of the two-dimensional MTF test pattern in the focus adjustment method of an embodiment of the present application;

[0032] Figure 3 It is a schematic diagram of a traditional one-dimensional MTF test pattern;

[0033] Figure 4 It is a schematic diagram of the face pattern in the focus adjustment method of an embodiment of the present application;

[0034] Figure 5 It is a schematic diagram of the focus test image in the focus adjustment method of an embodiment of the present application;

[0035] Figure 6 Fig. 2 is a schematic diagram of a curve of an image definition evaluation function;

[0036] Figure 7a Fig. 3 is a schematic diagram of a human face pattern obtained by imaging when the LMD is in a sharp focus state in an embodiment of the focus adjustment method of the present application;

[0037] Figure 7b Fig. 4 is a schematic diagram of a human face pattern obtained by imaging when the LMD is in an under-focus state in an embodiment of the focus adjustment method of the present application;

[0038] Figure 7c Fig. 5 is a schematic diagram of a human face pattern obtained by imaging when the LMD is in a slight under-focus state in an embodiment of the focus adjustment method of the present application;

[0039] Figure 7d Fig. 6 is a schematic diagram of a human face pattern obtained by imaging when the LMD is in an over-focus state in an embodiment of the focus adjustment method of the present application;

[0040] Figure 8 Fig. 7 is a schematic diagram of functional modules of an embodiment of the focus adjustment device of the present application.

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0043] In a first aspect, an embodiment of the present application provides a focus adjustment method.

[0044] In an embodiment, the focus adjustment method comprises the following steps: Figure 1 , Figure 1 Fig. 1 is a schematic diagram of a flow of an embodiment of the focus adjustment method of the present application. As shown in Fig. 1, the focus adjustment method comprises the following steps: Figure 1

[0045] In step S10, a first image obtained by imaging a focus test image displayed on a first display panel by a light measurement device (LMD) is acquired, wherein the focus test image comprises a two-dimensional MTF test pattern and a human face pattern.

[0046] ​In this embodiment, first, the focus test image is displayed on the first display panel, and then the focus test image displayed on the first display panel is imaged to obtain the first image by the light measurement device LMD, wherein the light measurement device LMD is generally an industrial camera or a plane array bright colorimeter. At this point, the first image obtained by the LMD imaging the focus test image displayed on the first display panel can be obtained by the execution subject of this embodiment. The focus test image includes a two-dimensional MTF test pattern and a face pattern.

[0047] Referring to Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a two-dimensional MTF test pattern in an embodiment of the focus adjustment method of the present application. The two-dimensional MTF test pattern has the following characteristics:

[0048] The two-dimensional MTF test pattern has multiple spatial frequencies, and the two-dimensional MTF test pattern is obtained by intersecting horizontal and vertical bar patterns with different spatial frequencies.

[0049] In an embodiment, the two-dimensional MTF test pattern is obtained by intersecting a horizontal conventional one-dimensional MTF test pattern and a vertical conventional one-dimensional MTF test pattern with different spatial frequencies, as shown in FIG. 2. Figure 3 , Figure 3 FIG. 2 is a schematic diagram of a conventional one-dimensional MTF test pattern.

[0050] Further, in an embodiment, the two-dimensional MTF test pattern has low, medium and high frequencies from the center to the edge.

[0051] A typical two-dimensional MTF test pattern is as follows:

[0052] The two-dimensional MTF test pattern is composed of a foreground area and a background area, and the gray scale values in each area remain unchanged. Typical gray scale values are 255 and 128, respectively. The resolutions of the background area and the foreground area are 200x200 and 162x162 pixels, respectively, and the centers are aligned. The foreground area is a rectangular wave pattern with central line axis symmetry, and has low frequency (period 10), medium frequency (period 6, 4) and high frequency (period 2) from the center to the edge. Each of the low and medium frequencies has 3 periods, and the high frequency has 4 periods, with a duty cycle of 50%. The center is a 16x16 foreground square block.

[0053] It should be noted that the above description is only a typical case of the two-dimensional MTF test pattern, and other ways can be used, such as adjusting the gray scale values, the number of periods, the spatial frequency, the overall resolution, etc. For example, the foreground and background gray scale values can be changed, such as 160 / 128, 96 / 128, etc.; the spatial period can be increased, such as using a period of 2, 4, 6, 8, 10, 12, 15; the number of periods can be increased or decreased; and the overall resolution can be adjusted accordingly based on the above modifications.

[0054] The face test pattern is a face front pattern, which can be a real face or a cartoon face, and the typical resolution is 65x65. A real face pattern is shown in FIG. 1. Figure 4 Figure 4 Figure 4 FIG. 1 is a schematic diagram of a face pattern in an embodiment of the focus adjustment method of the present application.

[0055] Further, in an embodiment, the plurality of different positions on the first display panel display a plurality of the two-dimensional MTF test patterns and the face pattern.

[0056] In the embodiment, the plurality of different positions on the first display panel display a plurality of the two-dimensional MTF test patterns and the face pattern, and the specific positions and the number are set according to actual needs.

[0057] It should be noted that this is only a schematic description of the focus test image, and in other embodiments, the focus test image can include only one two-dimensional MTF test pattern and one face pattern, and they are respectively arranged at corresponding positions. That is, the number and the distribution position of the two-dimensional MTF test pattern and the face pattern are set according to actual needs.

[0058] Further, in an embodiment, the four corners and the center of the screen body on the first display panel have the two-dimensional MTF test pattern and the face pattern.

[0059] Figure 5 Figure 5 FIG. 1 is a schematic diagram of a focus test image in an embodiment of the focus adjustment method of the present application. As shown in FIG. 1, the two-dimensional MTF test pattern and the face pattern are arranged at the four corner positions and the center position, that is, the focus test image includes a plurality of two-dimensional MTF test patterns and a plurality of face patterns. Figure 5

[0060] Step S20: automatically focusing the LMD according to the two-dimensional MTF test pattern in the first image.

[0061] In the embodiment, the passive image-based automatic focusing technology combined with the two-dimensional MTF test pattern in the first image can automatically focus the LMD. The passive image-based automatic focusing technology is introduced as follows.

[0062] ​​​​​Firstly, the sharpness of the image is quantitatively evaluated, i.e. the evaluation function is used to calculate the image sharpness value, and then a one-dimensional search algorithm is used to find the next possible focusing position until the sharpness of the imaging image meets the requirements. Common evaluation functions can be divided into three categories: one is based on image gradient, and it is generally believed that the gradient value of a sharp image is larger; one is based on image spectrum, and a sharp image is believed to contain more high-frequency information; and the last one is based on information theory, and the entropy of a sharp image is larger.

[0063] The "passive" in the "image-based passive autofocus technology" refers to not relying on external sensors, but relying on the image itself for focusing, for example, some active focusing is equipped with a ranging sensor.

[0064] In order to find the correct focusing position, the evaluation function needs to meet two basic requirements: unimodality and unbiasedness (such as Figure 6 , as shown in Figure 6 , which is a schematic diagram of the image sharpness evaluation function curve). Unimodality means that the evaluation function value curve has only one peak value; unbiasedness means that the peak value position of the curve is the focusing position. Focusing is performed by searching the peak value position of the evaluation function. If the peak value of the evaluation function is more than one, the algorithm may search for the wrong peak value, resulting in focusing failure; if the peak value of the evaluation function curve is only one, but the position corresponding to the peak value is not the focusing position, i.e. biased, then the focusing will also fail. Therefore, unimodality and unbiasedness can ensure that the search algorithm finds a unique evaluation function peak value and corresponds to the focusing position.

[0065] The evaluation function value is usually calculated by the built-in circuit of the LMD or the external PC according to the captured image, and the camera focusing ring is adjusted according to the change of the focusing function. That is, the focusing evaluation function is used to adjust the focusing position of the LMD, for example, when the evaluation function decreases in the positive direction, the next step is to adjust in the negative direction, until the focusing evaluation function decreases in any direction, at this time it is the clear focusing position.

[0066] It should be noted that when the focusing test image includes multiple two-dimensional MTF test patterns, the evaluation function peak value in the evaluation function of each two-dimensional MTF test pattern is integrated to determine the final focusing position.

[0067] Compared with the traditional one-dimensional MTF test pattern, the two-dimensional MTF test pattern used in the embodiment has the following characteristics: it has multiple spatial frequencies of high, medium and low instead of a fixed single frequency; the bar pattern has two directions of horizontal and vertical. Therefore, using the image-based passive autofocus technology, better unimodality and unbiasedness can be obtained under the two-dimensional MTF test pattern.

[0068] Step S30, adjust the focus ring of the LMD according to the face pattern, so that the LMD is in a slightly defocused state of the face pattern, and the first display panel grid points and moire patterns in the first image are invisible, and the face pattern is clearly visible.

[0069] In this embodiment, when the automatic focusing of the LMD is completed, only the focus ring of the LMD needs to be adjusted slightly at this time, so that the LMD is in a slightly defocused state of the face pattern. Wherein, the focus ring of the LMD can be adjusted automatically based on the preset adjustment parameters, and can also be adjusted manually based on the operation action of the operator.

[0070] Further, in an embodiment, the step of adjusting the focus ring of the LMD comprises:

[0071] In response to the adjustment operation, the focus ring of the LMD is adjusted, and during the adjustment process, the image obtained by the LMD in real time from the face pattern in the focus test image is displayed on the second display panel.

[0072] In this embodiment, the operator triggers the adjustment operation by manual, voice control and other operation methods. After the execution subject of this embodiment receives the adjustment operation, in response to the adjustment operation, the focus ring of the LMD is adjusted, and during the adjustment process, the image obtained by the LMD in real time from the face pattern in the focus test image is displayed on the second display panel. In this way, the operator can determine the state of the LMD by observing the image displayed on the second display panel, so as to guide the operator to adjust the LMD to a slightly defocused state more quickly.

[0073] Reference Figure 7a , Figure 7a The figure is a face pattern obtained by the LMD in a clear focusing state in an embodiment of the focus adjustment method of the application. Reference Figure 7b , Figure 7b The figure is a face pattern obtained by the LMD in an under-defocused state in an embodiment of the focus adjustment method of the application. Reference Figure 7c , Figure 7c The figure is a face pattern obtained by the LMD in a slightly defocused state in an embodiment of the focus adjustment method of the application. Reference Figure 7d , Figure 7d The figure is a face pattern obtained by the LMD in an over-defocused state in an embodiment of the focus adjustment method of the application. A typical face pattern obtained by the LMD in a clear focusing state is as follows: Figure 7aLMD is in slight under-focus state, the pixel grid and moire of the display panel are in invisible state in the face pattern, and the face image on the face pattern is in clear state. Figure 7c LMD is in slight under-focus state, the pixel grid and moire of the display panel are in invisible state in the face pattern, and the face image on the face pattern is in clear state.

[0074] As shown in Figure 7b LMD is in slight under-focus state, the pixel grid and moire of the display panel are in invisible state in the face pattern, and the face image on the face pattern is in clear state.

[0075] As shown in Figure 7d LMD is in slight under-focus state, the pixel grid and moire of the display panel are in invisible state in the face pattern, and the face image on the face pattern is in clear state.

[0076] According to a large number of psychological-vision researches, human beings have high visual perception sensitivity to face patterns from infancy, which may be related to evolution and living environment. Therefore, displaying the face pattern captured by the LMD in real time can facilitate the direct judgment of the focusing state of the LMD from the second display panel, i.e., clear focus, under-focus, slight under-focus or over-focus.

[0077] It should be noted that when the focus test image includes multiple face patterns, the operator can comprehensively judge the image displayed on the second display panel, which is obtained by the LMD in real time, to determine the focusing state of the LMD.

[0078] Further, in an embodiment, the step of adjusting the focusing ring of the LMD includes:

[0079] Adjusting the focusing ring of the LMD according to the preset adjustment parameter.

[0080] In this embodiment, the adjustment required for the focusing ring of the LMD to make the LMD in slight under-focus state after the automatic focusing of the LMD is completed can be determined in advance through calibration experiments, and the related adjustment parameters are saved. Subsequently, after the step S20 is executed, the focusing ring of the LMD can be adjusted according to the preset adjustment parameter, so that the LMD is in slight under-focus state.

[0081] Focusing adjustment on LMD is a basic step of display panel detection. However, the existing automatic focusing adjustment algorithm has the following problems when directly applied to display panel detection. First, focusing accuracy problem. The main application scene of traditional automatic focusing algorithm is real objects in nature. The images of the real objects generally have good continuity in space and frequency domain. However, when the object to be photographed is a display panel with periodic discrete pixels, the complexity and multi-peak problems of the focusing evaluation function are more serious than those of traditional natural object shooting. At this time, the focusing position obtained by the traditional automatic focusing algorithm may be incorrect or obviously out of focus. Second, speed problem. In order to ensure focusing accuracy, the traditional method usually needs to perform reciprocating multiple trials around the ideal focusing point. Third, it is impossible to achieve precise slight out-of-focus focusing state. The degree of out-of-focus is difficult to measure by traditional image evaluation function, and the traditional method is prone to lack of out-of-focus or excessive out-of-focus.

[0082] In the embodiment, a first image of a focusing test image displayed on a first display panel is obtained by a light measurement device LMD, the focusing test image includes a two-dimensional MTF test pattern and a face pattern; the LMD is automatically focused according to the two-dimensional MTF test pattern in the first image; the focusing ring of the LMD is adjusted according to the face pattern, so that the LMD is in a slight out-of-focus state of the face pattern. The slight out-of-focus state of the face pattern is that the first display panel grid points and moire patterns in the first image are invisible, and the face pattern is clearly visible. Since the display panel has the characteristic of periodic arrangement of discrete light-emitting pixels, in order to avoid or weaken moire, the LMD needs to be in a slight out-of-focus state to take an image of the screen image on the first display panel during AOI detection and DeMura. Through the embodiment, the LMD is first automatically focused based on the two-dimensional MTF test pattern. After the automatic focusing of the LMD is completed, the focusing ring of the LMD is further adjusted, so that the LMD can quickly reach the slight out-of-focus state, thereby quickly obtaining a screen image that can accurately extract the brightness of each pixel on the first display panel.

[0083] Further, in an embodiment, after step S20, further comprising:

[0084] Detecting whether the automatic focusing is correct; if the automatic focusing is correct, performing the step of adjusting the focusing ring of the LMD.

[0085] In the embodiment, detecting whether the automatic focusing is correct means detecting whether the LMD is in a clear focusing state. If yes, it is determined that the automatic focusing is correct, and then step S30 is performed.

[0086] Further, in an embodiment, the step of detecting whether the automatic focusing is correct comprises:

[0087] acquiring a new first image by taking a picture of the in-focus test image displayed on the first display panel by the LMD in the auto-focusing state;

[0088] detecting whether the face pattern in the new first image is the face pattern taken when the LMD is in the in-focus state;

[0089] if the face pattern in the new first image is the face pattern taken when the LMD is in the in-focus state, determining that the auto-focusing is correct;

[0090] if the face pattern in the new first image is not the face pattern taken when the LMD is in the in-focus state, determining that the auto-focusing is incorrect.

[0091] In the embodiment, the face pattern taken when the LMD is in the in-focus state can be preset as a standard face pattern as shown in FIG. 2. After step S20, the LMD in the auto-focusing state takes a picture of the in-focus test image displayed on the first display panel again, thereby acquiring a new first image. Figure 7a

[0092] The face pattern in the new first image is compared with the preset face pattern taken when the LMD is in the in-focus state (i.e. the standard face pattern). If the similarity between the two is greater than a preset threshold, it is determined that the face pattern in the new first image is the face pattern taken when the LMD is in the in-focus state, thereby determining that the auto-focusing is correct; otherwise, it is determined that the auto-focusing is incorrect.

[0093] Of course, the face pattern in the new first image can also be displayed on the second display panel, and a subjective judgment is made by an operator on the face pattern in the new first image. If the face pattern in the new first image is determined to be the face pattern taken when the LMD is in the in-focus state, a confirmation instruction is triggered. When the execution subject of the embodiment receives the confirmation instruction, it is determined that the auto-focusing is correct. On the contrary, if the operator triggers a negative instruction, when the execution subject of the embodiment receives the negative instruction, it is determined that the auto-focusing is incorrect.

[0094] Further, in an embodiment, after the step of detecting whether the auto-focusing is correct, the method further comprises:

[0095] if the auto-focusing is incorrect, returning to the step of acquiring the first image taken by the LMD on the in-focus test image displayed on the first display panel.

[0096] In the embodiment, if it is detected that the auto-focusing is incorrect, the process returns to step S10, i.e. the auto-focusing process is performed again.

[0097] In a second aspect, the embodiment of the present application further provides a focusing adjustment device. ​

[0098] In one embodiment, referring to Figure 8 , Figure 8 Figure 1 is a schematic diagram of a functional module of an embodiment of the focus adjustment device of the present application. As shown in Figure 1, the focus adjustment device comprises: Figure 8

[0099] an acquisition module 10, configured to acquire a first image obtained by a light measurement device (LMD) from a focus test image displayed on a first display panel, the focus test image comprising a two-dimensional MTF test pattern and a face pattern;

[0100] an auto-focusing module 20, configured to perform auto-focusing on the LMD according to the two-dimensional MTF test pattern in the first image;

[0101] an adjustment module 30, configured to adjust a focus ring of the LMD so that the LMD is in a slightly defocused state of the face pattern, the slightly defocused state of the face pattern being that the first display panel grid points and moire patterns in the first image are invisible, and the face pattern is clearly visible.

[0102] Further, in one embodiment, the focus adjustment device further comprises a detection module, configured to:

[0103] detect whether the auto-focusing is correct;

[0104] if the auto-focusing is correct, perform the step of adjusting the focus ring of the LMD.

[0105] Further, in one embodiment, the detection module is configured to:

[0106] acquire a new first image obtained by the LMD after auto-focusing from the focus test image displayed on the first display panel;

[0107] detect whether the face pattern in the new first image is a face pattern obtained when the LMD is in a clear focus state;

[0108] if the face pattern in the new first image is the face pattern obtained when the LMD is in the clear focus state, it is determined that the auto-focusing is correct;

[0109] if the face pattern in the new first image is not the face pattern obtained when the LMD is in the clear focus state, it is determined that the auto-focusing is incorrect.

[0110] Further, in one embodiment, the detection module is configured to:

[0111] if the auto-focusing is incorrect, return to the step of acquiring the first image obtained by the LMD from the focus test image displayed on the first display panel

[0112] ​Further, in an embodiment, the adjusting module 30 is configured to:

[0113] In response to the adjusting operation, the focusing ring of the LMD is adjusted, and during the adjusting process, the second display panel displays images obtained by the LMD in real time from the face pattern in the focusing test image.

[0114] Further, in an embodiment, the first display panel displays a plurality of the two-dimensional MTF test patterns and the face pattern at a plurality of different positions.

[0115] Further, in an embodiment, the first display panel displays the two-dimensional MTF test patterns and the face pattern at the center and the four corners of the screen.

[0116] Further, in an embodiment, the two-dimensional MTF test pattern has a plurality of spatial frequencies, and the two-dimensional MTF test pattern is obtained by intersecting horizontal and vertical bar patterns with different spatial frequencies.

[0117] Further, in an embodiment, the two-dimensional MTF test has low, medium and high frequencies from the center to the edge.

[0118] It should be noted that the functions of the modules in the focusing adjusting device correspond to the steps in the focusing adjusting method, and the functions and implementation processes will not be repeated here.

[0119] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or systems including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or systems. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or system including the element.

[0120] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0121] Those skilled in the art can clearly understand the above-mentioned embodiment method can be realized by means of software and necessary general hardware platform, of course, can also be through hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application essentially or say the part of contribution to the prior art can be embodied in the form of software product, the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disc, optical disc) as described above, including a number of instructions to make a terminal device execute the method described in various embodiments of the present application.

[0122] The above is only the preferred embodiment of the present application, not therefore limit the patent scope of the present application, any equivalent structure or equivalent flow transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A focus adjustment method, characterized in that, The focus adjustment method includes: A first image is obtained by acquiring a focus test image displayed on a first display panel using an optical measurement device (LMD). The focus test image includes a two-dimensional MTF test pattern and a face pattern. The LMD is automatically focused based on the two-dimensional MTF test pattern in the first image; The focus ring of the LMD is adjusted according to the face pattern so that the LMD is in a slightly out-of-focus state of the face pattern. The slightly out-of-focus state of the face pattern means that the grid and moiré pattern of the first display panel are not visible in the first image, and the face pattern is clearly visible. The two-dimensional MTF test pattern has multiple spatial frequencies and is obtained by finding the intersection of horizontal and vertical bar patterns with different spatial frequencies.

2. The focus adjustment method as described in claim 1, characterized in that, After the step of autofocusing the LMD based on the two-dimensional MTF test pattern in the first image, the method further includes: Check if the autofocus is working correctly; If the autofocus is correct, then proceed with the step of adjusting the focus ring of the LMD.

3. The focus adjustment method as described in claim 2, characterized in that, The steps for detecting whether the autofocus is correct include: A new first image is obtained by capturing the focus test image displayed on the first display panel using an autofocused LMD. Detect whether the face pattern in the new first image is a face pattern captured when the LMD is in clear focus state; If the face pattern in the new first image is the face pattern captured when the LMD is in sharp focus mode, then the autofocus is confirmed to be correct. If the face pattern in the new first image is not the same as the face pattern captured when the LMD was in sharp focus, then an autofocus error is determined.

4. The focus adjustment method as described in claim 3, characterized in that, Following the step of detecting whether the autofocus is correct, the method further includes: If the autofocus fails, return to the step of acquiring the first image obtained by the light measurement device LMD from the focus test image displayed on the first display panel.

5. The focus adjustment method as described in claim 1, characterized in that, The steps for adjusting the focus ring of the LMD include: In response to the adjustment operation, the focus ring of the LMD is adjusted, and during the adjustment process, the image obtained by the LMD in real time capturing the face pattern in the focus test image is displayed on the second display panel.

6. The focus adjustment method as described in claim 1, characterized in that, Multiple two-dimensional MTF test patterns and face patterns are displayed at multiple different locations on the first display panel.

7. The focus adjustment method as described in claim 1, characterized in that, The first display panel has the two-dimensional MTF test pattern and the face pattern at the four corners and the center of the screen.

8. The focus adjustment method as described in claim 1, characterized in that, The two-dimensional MTF test proceeds from the center to the edge, consisting of low frequency, mid frequency, and high frequency.

9. A focus adjustment device, characterized in that, The focus adjustment device includes: The acquisition module is used to acquire a first image obtained by the optical measurement device (LMD) capturing the focus test image displayed on the first display panel. The focus test image includes a two-dimensional MTF test pattern and a face pattern. An autofocus module is used to automatically focus the LMD based on the two-dimensional MTF test pattern in the first image; The adjustment module is used to adjust the focus ring of the LMD so that the LMD is in a slightly out-of-focus state of the face pattern. The slightly out-of-focus state of the face pattern means that the grid and moiré patterns of the first display panel are not visible in the first image, and the face pattern is clearly visible. The two-dimensional MTF test pattern has multiple spatial frequencies and is obtained by finding the intersection of horizontal and vertical bar patterns with different spatial frequencies.

Images