CN114333658B - Method and device for testing response time of liquid crystal display system - Google Patents
Method and device for testing response time of liquid crystal display system Download PDFInfo
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Abstract
The application provides a method and a device for testing response time of a liquid crystal display system, which can accurately and systematically evaluate the response time of the liquid crystal display system when different image contents change at different image refresh rates. The method comprises the following steps: acquiring a refresh rate of a liquid crystal display system; generating a test image set according to the refresh rate and controlling the playing of the test image set; collecting image information of an image playing process of a liquid crystal display system; and acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system.
Description
Technical Field
The application relates to a method and a device for testing response time of a liquid crystal display system, and belongs to the technical field of liquid crystal display.
Background
In the field of medical image display, there is a high requirement on response time of image display, such as DSA and dynamic images of endoscopic surgery, and if the response time is insufficient, smear, image residue and the like can occur to affect the use. Meanwhile, in the field of radiology, along with the application of a high-resolution system, the response time of a display system is more important, and the response time is large, so that smoothness of retrieving an image set by a doctor through a PACS (picture archiving and communication system) and timeliness of mouse response are poor, and the trial implementation of a client is seriously influenced.
Display products have multiple refresh rates, multiple panels, different refresh rates and combinations of different panels can produce characteristic display response characteristics that ultimately differ significantly in response time. At present, no method is available for measuring the image display response time performance of a display system, and whether the display response of different images can meet the diagnosis requirement cannot be evaluated by judging whether the response of a mouse is smooth or not.
Disclosure of Invention
The application aims to overcome the defects in the prior art, and provides a method and a device for testing response time of a liquid crystal display system, which can accurately and systematically evaluate the response time of the liquid crystal display system when different image contents change at different image refresh rates.
In order to achieve the above purpose, the application is realized by adopting the following technical scheme:
in a first aspect, the present application provides a method for testing response time of a liquid crystal display system, comprising the steps of:
acquiring a refresh rate of a liquid crystal display system;
generating a test image set according to the refresh rate and controlling the playing of the test image set;
collecting image information of an image playing process of a liquid crystal display system;
and acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system.
Further, the method for obtaining the refresh rate of the liquid crystal display system comprises the following steps:
and calling a system parameter acquisition interface through application software connected with the liquid crystal display system to obtain the refresh rate.
Further, the method for generating the test image set and controlling the playing of the test image set according to the refresh rate comprises the following steps:
after the refresh rate is obtained, assigning the refresh rate value to the image frame number n and the play frame rate f;
controlling the play switching of the image at the frame rate of f;
generating a test image set of n frames;
and controlling the liquid crystal display system to play the test image set at the play frame rate f.
Further, the test image set includes:
a low gray scale section multiple low contrast pattern set, a medium gray scale section multiple low contrast pattern set, a high gray scale section low contrast pattern set, and a white 4095 gray and full black multiple high contrast patterns.
Further, the method for generating the test image set includes:
selecting a background and a graph to generate a graph with low contrast;
the first column of the graphic of each frame image is shifted one column back from the first column of the previous frame;
placing a frame number on each image to identify which frame image is; the frame numbers are arranged backward in sequence one row above the graph, and after one row is filled, the frame numbers are moved to the next row of graph to continue numbering.
Further, the background comprises 0,128 and 255 gray scales;
the pattern is a regular pattern, including square, circle or alphanumeric;
the gray level of the graph is increased by 16 gray levels in turn compared with the 0 and 128 background colors, and the gray level is reduced by 16 gray levels in turn compared with the 255 background colors.
Further, the method for collecting the image information in the image playing process of the liquid crystal display system comprises the following steps:
collecting image information of an image playing process of the liquid crystal display system at a viewing angle of human eyes through a high-frequency camera at an acquisition frequency which is more than 2 times of a playing frame rate f;
the image information of the image playing process of the liquid crystal display system at least comprises 1000 pictures.
Further, the method for obtaining the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system comprises the following steps:
identifying and comparing an image in the image playing process of the liquid crystal display system with the content of a preset image library to obtain the coincidence frame number;
and calculating and obtaining the response time of the liquid crystal display system according to the superposition frame number and the frame rate.
Further, the method for identifying and comparing the image in the image playing process of the liquid crystal display system with the content of the preset image library to obtain the coincidence frame number comprises the following steps:
sequentially identifying the frame numbers of the images, and if one image contains more than 1 frame number, carrying out next identification on the image;
according to different image information of the image and the superposition condition of each image according to the divided space regions, acquiring the superposition rate by comparing the acquired image with a preset image; if the coincidence rate is more than 90%, judging that the frames under the information and the area coincide, and recording the overlapping frames;
and counting the number of the coincident frames to obtain the coincident frame number.
Further, the method for calculating and obtaining the response time of the liquid crystal display system according to the coincidence frame number and the frame rate comprises the following steps:
the response time of the liquid crystal display system is calculated by the following formula:
response time of liquid crystal display system = coinciding frame number/frame rate.
Further, the method for obtaining the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system further comprises the following steps:
identifying and comparing images in the image playing process of the liquid crystal display system with the contents of a preset image library to obtain the frame superposition conditions of different areas and different image contents of the liquid crystal display system;
and evaluating the frame superposition conditions of different areas and different image contents, and counting the response time of the liquid crystal display system by a data analysis method.
In a second aspect, the present application provides an apparatus for testing response time of a liquid crystal display system, comprising:
and a frame rate identification and control module: the method is used for acquiring the refresh rate of the liquid crystal display system;
and the test image set generation and playing module is used for: the method comprises the steps of generating a test image set according to the refresh rate and controlling the playing of the test image set;
a high-frequency image acquisition module: the method comprises the steps of acquiring image information of an image playing process of a liquid crystal display system;
the image data analysis processing module: the response time of the liquid crystal display system is obtained according to the image information of the image playing process of the liquid crystal display system.
In a third aspect, the present application provides an apparatus for testing response time of a liquid crystal display system, comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to the first aspect.
Compared with the prior art, the application has the beneficial effects that:
1. the application provides a method and a device for testing response time of a liquid crystal display system, which are used for inputting a test image set into the liquid crystal display system according to a refresh rate set by images, shooting and recording the content change process of the images, and finally obtaining the response time of the liquid crystal display system. The test is quick and convenient, and the accuracy is high. The method generates the test image set through the refresh rate, overcomes the defect that various types of display systems are difficult to be quantized in standard in the prior art, and can accurately and systematically evaluate the response time of the liquid crystal display system when the content of different images changes at different image refresh rates.
2. Aiming at the liquid crystal display system at the client, the application is not a single liquid crystal device, mainly realizes the test of the response time of the liquid crystal system in use by a user, and fills the blank of domestic technology.
3. The application provides a response time evaluation method of a display system, which can be realized by a non-professional optical laboratory. Meanwhile, the test image set has strong observability, covers the whole information range of the medical image, and simultaneously considers the image change condition of low contrast response and high contrast response to evaluate the liquid crystal display system more comprehensively. The difference of response time in switching different image contents can be obtained, and meanwhile, the obtained image is observed through human eyes, so that the time response characteristic of the liquid crystal system in switching different image contents can be intuitively observed.
4. The application can measure the system response time under different refresh rates and different image contents (low gray scale process and high gray scale transition), the image contents cover the full gray scale range of the display system, the test range is large, the precision is high, and the test image set can comprehensively detect the performance and response time of the liquid crystal test system.
5. The application can test the system response time under different refresh rates, automatically acquire the refresh rate of the signal source, and perform frame rate conversion; the test image set comprises low gray level transition and high gray level transition in a full gray level range, is automatically acquired and analyzed, performs data comparison with a preset image library, calculates response time, has strong operation flow executable performance, is easy to operate and standardize, and has higher universality.
Drawings
FIG. 1 is a first frame image of a test atlas;
FIG. 2 is a second frame image of a test atlas;
fig. 3 is a schematic information diagram of the first frame image remaining to the second frame image;
FIG. 4 is a block diagram of the operational steps of the present application;
fig. 5 is a schematic diagram of the modular connection of the present application.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Embodiment one:
the embodiment provides a method for testing response time of a liquid crystal display system, which comprises the following steps:
acquiring a refresh rate of a liquid crystal display system;
generating a test image set according to the refresh rate and controlling the playing of the test image set;
collecting image information of an image playing process of a liquid crystal display system;
and acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system.
Specifically, the method for obtaining the refresh rate of the liquid crystal display system includes: and calling a system parameter acquisition interface through application software connected with the liquid crystal display system to obtain the refresh rate.
Specifically, the method for generating the test image set and controlling the playing of the test image set according to the refresh rate comprises the following steps: after the refresh rate is obtained, assigning the refresh rate value to the image frame number n and the play frame rate f; controlling the play switching of the image at the frame rate of f; generating a test image set of n frames; and controlling the liquid crystal display system to play the test image set at the play frame rate f.
Specifically, the test image set includes: a low gray scale section multiple low contrast pattern set, a medium gray scale section multiple low contrast pattern set, a high gray scale section low contrast pattern set, and a white 4095 gray and full black multiple high contrast patterns.
Specifically, the method for generating the test image set includes: selecting a background and a graph to generate a graph with low contrast; the first column of the graphic of each frame image is shifted one column back from the first column of the previous frame; placing a frame number on each image to identify which frame image is; the frame numbers are arranged backwards in sequence in a row above the graph, and after one row is filled, the frame numbers are moved to the upper row of the graph of the next row to continue numbering; the background includes 0,128,255 gray scales; the pattern is a regular pattern, including square, circle, or alphanumeric; the gray level of the graph is sequentially increased by 16 gray levels compared with the 0 and 128 background colors, and is sequentially reduced by 16 gray levels for the 255 background colors.
Specifically, the method for collecting the image information in the image playing process of the liquid crystal display system comprises the following steps:
collecting image information of an image playing process of the liquid crystal display system at a viewing angle of human eyes through a high-frequency camera at an acquisition frequency which is more than 2 times of a playing frame rate f; the image information of the image playing process of the liquid crystal display system at least comprises 1000 pictures.
Specifically, the method for acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system comprises the following steps:
identifying and comparing an image in the image playing process of the liquid crystal display system with the content of a preset image library to obtain the coincidence frame number;
and calculating and obtaining the response time of the liquid crystal display system according to the superposition frame number and the frame rate.
Specifically, the method for identifying and comparing the image in the image playing process of the liquid crystal display system with the content of the preset image library to obtain the coincidence frame number comprises the following steps:
sequentially identifying the frame numbers of the images, and if one image contains more than 1 frame number, carrying out next identification on the image;
according to different image information of the image and the superposition condition of each image according to the divided space regions, acquiring the superposition rate by comparing the acquired image with a preset image; if the coincidence rate is more than 90%, judging that the frames under the information and the area coincide, and recording the overlapping frames;
and counting the number of the coincident frames to obtain the coincident frame number.
Specifically, the method for calculating and obtaining the response time of the liquid crystal display system according to the coincidence frame number and the frame rate comprises the following steps:
the response time of the liquid crystal display system is calculated by the following formula:
response time of liquid crystal display system = coinciding frame number/frame rate.
Specifically, the method for obtaining the response time of the liquid crystal display system according to the image information in the image playing process of the liquid crystal display system further comprises the following steps:
identifying and comparing images in the image playing process of the liquid crystal display system with the contents of a preset image library to obtain the frame superposition conditions of different areas and different image contents of the liquid crystal display system;
the frame coincidence of different areas and different image contents is evaluated, giving the worst response time.
Specifically, the method for counting the response time of the liquid crystal display system by the data analysis method can calculate the response time delay of each frame of image of the same image change content according to the frame rate interpolation of the collected image, and the analysis is carried out according to the following method:
first, the data is ordered from big to small by X 1 ,X 2 ...X n 。X 1 ,X 2 ...X n Is the response time obtained.
The interval sensitivity P is set as an acceptable delay variation.
Grouping data starting from the smallest data, with a sensitivity P of 1ms, e.g. X i For the start of the first group, X i +1ms (assumed to be the ith data X i ) Is the end point.
By X i+1 For the start point of the second group, the end point of the second group is obtained by calculation with an interval sensitivity of 1 ms.
By analogy, the data is divided into R groups.
Respectively counting the number of image frames contained in R groups of data, wherein the group with the largest number of image frames is used as a data group R for delay calculation F 。
Calculating R F The average value of the delay in the group is used as the delay of the system.
Specifically, the frame rate is acquired, and an image of n frames is generated. The image comprises two parts of first parts, wherein 0,128,255 gray scales are selected as the background, squares, circles or alphanumerics are selected as the graphics, low-contrast graphics are generated, the gray scales of the graphics are sequentially increased by 16 gray scales (for 0 and 128 background colors) compared with the background colors, and the gray scales of the graphics are sequentially reduced by 16 gray scales (for 255 background colors). Each image is provided with a frame number which identifies the number of the image, and the numbers are 1 and 2 … n. The specific implementation is illustrated by square patterns as follows:
the first frame image is shown in fig. 1, and the 2 nd frame image is shown in fig. 2. The image follows the pattern described above, where the pattern of squares may be other regular patterns, or alphanumeric. The first column of the square pattern of the image of the subsequent frame starts one column later than the first column of the previous frame. And sequentially circulating according to the rule. The frame numbers are arranged backward one row at a time above the graph, and after one row is full, the frame numbers are moved to the next row of square upper row to continue numbering.
Collecting image information of an image playing process of the liquid crystal display system at a viewing angle of human eyes through a high-frequency camera at an acquisition frequency which is more than 2 times of a playing frame rate f; the image information of the image playing process of the liquid crystal display system at least comprises 1000 pictures. To ensure accuracy of the image acquisition content, the frame rate of the high frequency camera is set to at least 200fps, i.e., 200 frames of images are acquired and stored per second. The camera is connected to a data processing system through a data line, the data processing system can be a computer running data analysis software, and the data analysis results can be displayed in a visual form. The camera acquisition and data processing display equipment can be specially made, and the equipment can directly process data on a CPU (central processing unit) in the equipment after acquiring images and display the images on a display screen of the equipment. By observing the obtained image by the human eye, the time response characteristic of the liquid crystal system can be intuitively observed when different image contents are switched.
And then identifying the frame numbers of the images in the image playing process of the liquid crystal display system, if one image contains more than 1 frame number, carrying out the next identification on the image, taking the example that the shot image is a first frame and a second frame which are overlapped, wherein the specific analysis method is as follows:
information of the first frame image remaining to the second frame image (more frame image remaining refers to the thought analogy):
further judging the superposition condition of the first frame image and the second frame image in different image information (4 types of images are respectively divided into A, B, C and D) and each image according to different space areas (divided into 3 space areas), wherein the superposition image of each image information of each area is built in the system, and the superposition rate is larger than 90% by comparing the acquired image with a preset image, so that the superposition of the frames under the information and the area is judged. And obtaining the maximum number of frame image fusion.
Assuming a frame rate of 60fps, more than 50% of the 1000 images acquired have 2 overlapping frames, A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3.
The time response characteristics of the display system can be determined as: 1000ms/60×2=33 ms.
The spatial response characteristics are uniform. In the full gray scale range, the response characteristics of all the image information are consistent.
Assuming that 3 frames of the region are fused in B1, B2, and B3, the temporal response of the image content of the B-class image content is 1000ms/60×3=50 ms.
Finally, the response time of different areas of different image contents is given.
In this embodiment, the frame rate recognition and control module obtains the refresh rate of the display card as the number of test chart frames to be generated and the play frame rate of the test chart. The test pattern generation and playing module generates and plays a test pattern for testing the response time of the liquid crystal display system according to the frame rate, the high-frequency image acquisition module acquires images at the human eye observation visual angle, and the image analysis module calculates and analyzes the time response of the liquid crystal display system.
Embodiment two:
the present embodiment provides an apparatus for testing response time of a liquid crystal display system, as shown in fig. 5, which achieves the object of the present application by the following modules:
(1) And a frame rate identification and control module: the frame rate identification and control module is used for identifying and obtaining the refresh rate of the display card, wherein the refresh rate is used as the frame rate and the image frame number of the test image for playing, and is used for generating the input of the test image set generation and playing module, generating the image with the corresponding frame number and controlling the playing of the image.
(2) And the test image set generation and playing module is used for: and generating a test image set according to the frame rate obtained by the frame rate identification and control module.
(3) A high-frequency image acquisition module: the high-frequency image acquisition module acquires the images generated by the test image set generation and play module, and transmits the images to the image data analysis processing module for analysis processing through the communication interface.
(4) The image data analysis processing module: and comparing the image content acquired by the high-frequency image acquisition module with a preset image library. And calculating the response time of the display system according to the coincidence frame number and the frame rate. And meanwhile, the overlapping frame duty ratio under different areas and different image information is counted and can be used as a basis for evaluating response performance.
In this embodiment, the frame rate recognition and control module obtains the refresh rate of the display card as the number of test chart frames to be generated and the play frame rate of the test chart. The test pattern generation and playing module generates and plays a test pattern for testing the response time of the liquid crystal display system according to the frame rate, the high-frequency image acquisition module acquires images at the human eye observation visual angle, and the image analysis module calculates and analyzes the time response of the liquid crystal display system.
The embodiment provides a device for testing response time of a liquid crystal display system, which can obtain a display card refresh rate through the identification of a frame rate identification and control module, takes the value of the display card refresh rate as an image play frame rate value and controls the display and play of an image set; the test image set generation module is used for generating a test chart of response time of the liquid crystal display system, wherein the test chart covers low contrast image information and high contrast image information in the whole gray scale section of low, medium and high gray scales, generates an image frame number equal to a system refresh rate value, and marks the number of frames on each frame of image; and acquiring the image by a high-frequency image acquisition module at a human eye observation visual angle, and finally analyzing the acquired data by an image data analysis processing module to obtain response time when different image contents of the display system are switched.
Based on the technical scheme, the technical scheme inside each module is further introduced:
the frame rate identification and control module obtains the refresh rate by calling a system parameter acquisition interface through application software (for example, function GetDisplayFrequency: integer;
var
DeviceMode:TDeviceMode；
begin
EnumDisplaySettings(nil,Cardinal(-1),DeviceMode)；
Result:＝DeviceMode.dmDisplayFrequency；
end；)
after the refresh rate is obtained, the refresh rate value is assigned to the image frame number n, and the play frame rate f is transmitted to the test image set generation and play module by taking n and f as parameters. And controlling the playing switching of the image generated by the test image set generation and playing module at the frame rate of f.
The test image set generating and playing module generates n frames of images according to the parameter n acquired from the frame rate identifying and controlling module. The image comprises two parts of first parts, wherein 0,128,255 gray scales are selected as the background, squares, circles or alphanumerics are selected as the graphics, low-contrast graphics are generated, the gray scales of the graphics are sequentially increased by 16 gray scales (for 0 and 128 background colors) compared with the background colors, and the gray scales of the graphics are sequentially reduced by 16 gray scales (for 255 background colors). Each image is provided with a frame number which identifies the number of the image, and the numbers are 1 and 2 … n. The specific implementation is illustrated by square patterns as follows:
the first frame image is shown in fig. 1, and the 2 nd frame image is shown in fig. 2.
The image follows the pattern described above, where the pattern of squares may be other regular patterns, or alphanumeric. The first column of the square pattern of the image of the subsequent frame starts one column later than the first column of the previous frame. And sequentially circulating according to the rule.
The frame numbers are arranged backward one row at a time above the graph, and after one row is full, the frame numbers are moved to the next row of square upper row to continue numbering.
Generating n frames of images, and playing the image set at a frame rate f.
The high-frequency image acquisition module acquires image content at an acquisition frequency which is more than 2 times of the image playing frame rate f, and the acquisition frequency is a high-frequency camera for acquiring at least 1000 pictures. To ensure accuracy of the image acquisition content, the frame rate of the high frequency camera is set to at least 200fps, i.e., 200 frames of images are acquired and stored per second. The camera is connected to a data processing system through a data line, the data processing system can be a computer running data analysis software, and the data analysis results can be displayed in a visual form. The camera acquisition and data processing display equipment can be specially made, and the equipment can directly process data on a CPU (central processing unit) in the equipment after acquiring images and display the images on a display screen of the equipment.
And the image data analysis processing module is used for acquiring the data acquired by the high-frequency image acquisition module through the data interface. Firstly, identifying the frame number of an image, if one image contains more than 1 frame number, then carrying out next identification on the image, taking the shot image as a first frame and a second frame to be overlapped as an example, and specifically analyzing as follows:
information of the first frame image remaining to the second frame image (more frame image remaining refers to the thought analogy):
further judging the superposition condition of the first frame image and the second frame image in different image information (4 types of images are respectively divided into A, B, C and D) and each image according to different space areas (divided into 3 space areas), wherein the superposition image of each image information of each area is built in the system, and the superposition rate is larger than 90% by comparing the acquired image with a preset image, so that the superposition of the frames under the information and the area is judged. And obtaining the maximum number of frame image fusion.
Assuming a frame rate of 60fps, more than 50% of the 1000 images acquired have 2 overlapping frames, A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3.
The time response characteristics of the display system can be determined as: 1000ms/60×2=33 ms.
The spatial response characteristics are uniform. In the full gray scale range, the response characteristics of all the image information are consistent.
Assuming that 3 frames of the region are fused in B1, B2, and B3, the temporal response of the image content of the B-class image content is 1000ms/60×3=50 ms.
Finally, the response time of different areas of different image contents is given.
Embodiment III:
the embodiment of the application also provides a device for testing the response time of the liquid crystal display system, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to embodiment one:
acquiring a refresh rate of a liquid crystal display system;
generating a test image set according to the refresh rate and controlling the playing of the test image set;
collecting image information of an image playing process of a liquid crystal display system;
and acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present application, and such modifications and variations should also be regarded as being within the scope of the application.
Claims (8)
1. A method for testing response time of a liquid crystal display system, comprising the steps of:
acquiring a refresh rate of a liquid crystal display system;
generating a test image set according to the refresh rate and controlling the playing of the test image set;
collecting image information of an image playing process of a liquid crystal display system;
acquiring response time of the liquid crystal display system according to image information of an image playing process of the liquid crystal display system;
the method for generating the test image set comprises the following steps:
selecting a background and a graph to generate a graph with low contrast;
the first column of the graphic of each frame image is shifted one column back from the first column of the previous frame;
placing a frame number on each image to identify which frame image is; the frame numbers are arranged backwards in sequence in a row above the graph, and after one row is filled, the frame numbers are moved to the upper row of the graph of the next row to continue numbering;
the method for acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system comprises the following steps:
sequentially identifying the frame numbers of the images, and if one image contains more than 1 frame number, carrying out next identification on the image;
according to different image information of the image and the superposition condition of each image according to the divided space regions, acquiring the superposition rate by comparing the acquired image with a preset image; if the coincidence rate is more than 90%, judging that the frames under the information and the area coincide, and recording the overlapping frames;
counting the number of the coincident frames to obtain the coincident frame number;
the method for calculating and obtaining the response time of the liquid crystal display system according to the coincidence frame number and the frame rate comprises the following steps:
the response time of the liquid crystal display system is calculated by the following formula:
response time of liquid crystal display system = coincidence frame number/frame rate;
the method for obtaining the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system further comprises the following steps:
identifying and comparing images in the image playing process of the liquid crystal display system with the contents of a preset image library to obtain the frame superposition conditions of different areas and different image contents of the liquid crystal display system;
and evaluating the frame superposition conditions of different areas and different image contents, and counting the response time of the liquid crystal display system by a data analysis method.
2. The method of claim 1, wherein the step of obtaining a refresh rate of the liquid crystal display system comprises:
and calling a system parameter acquisition interface through application software connected with the liquid crystal display system to obtain the refresh rate.
3. The method of testing response time of a liquid crystal display system of claim 1, wherein the method of generating a test image set and controlling playback of the test image set according to the refresh rate comprises:
after the refresh rate is obtained, assigning the refresh rate value to the image frame number n and the play frame rate f;
controlling the play switching of the image at the frame rate of f;
generating a test image set of n frames;
and controlling the liquid crystal display system to play the test image set at the play frame rate f.
4. A method for testing response time of a liquid crystal display system according to claim 3, wherein said testing image set comprises:
a low gray scale section multiple low contrast pattern set, a medium gray scale section multiple low contrast pattern set, a high gray scale section low contrast pattern set, and a white 4095 gray and full black multiple high contrast patterns.
5. The method of testing the response time of a liquid crystal display system of claim 4,
the background comprises 0,128 and 255 gray scales;
the pattern is a regular pattern, including square, circle or alphanumeric;
the gray level of the graph is increased by 16 gray levels in turn compared with the 0 and 128 background colors, and the gray level is reduced by 16 gray levels in turn compared with the 255 background colors.
6. The method of claim 1, wherein the step of collecting image information of an image playback process of the liquid crystal display system comprises:
collecting image information of an image playing process of the liquid crystal display system at a viewing angle of human eyes through a high-frequency camera at an acquisition frequency which is more than 2 times of a playing frame rate f;
the image information of the image playing process of the liquid crystal display system at least comprises 1000 pictures.
7. An apparatus for testing response time of a liquid crystal display system, the apparatus comprising:
and a frame rate identification and control module: the method is used for acquiring the refresh rate of the liquid crystal display system;
and the test image set generation and playing module is used for: the method comprises the steps of generating a test image set according to the refresh rate and controlling the playing of the test image set;
a high-frequency image acquisition module: the method comprises the steps of acquiring image information of an image playing process of a liquid crystal display system;
the image data analysis processing module: the response time of the liquid crystal display system is obtained according to the image information of the image playing process of the liquid crystal display system;
the method for generating the test image set comprises the following steps:
selecting a background and a graph to generate a graph with low contrast;
the first column of the graphic of each frame image is shifted one column back from the first column of the previous frame;
placing a frame number on each image to identify which frame image is; the frame numbers are arranged backwards in sequence in a row above the graph, and after one row is filled, the frame numbers are moved to the upper row of the graph of the next row to continue numbering;
the method for acquiring the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system comprises the following steps:
sequentially identifying the frame numbers of the images, and if one image contains more than 1 frame number, carrying out next identification on the image;
according to different image information of the image and the superposition condition of each image according to the divided space regions, acquiring the superposition rate by comparing the acquired image with a preset image; if the coincidence rate is more than 90%, judging that the frames under the information and the area coincide, and recording the overlapping frames;
counting the number of the coincident frames to obtain the coincident frame number;
the method for calculating and obtaining the response time of the liquid crystal display system according to the coincidence frame number and the frame rate comprises the following steps:
the response time of the liquid crystal display system is calculated by the following formula:
response time of liquid crystal display system = coincidence frame number/frame rate;
the method for obtaining the response time of the liquid crystal display system according to the image information of the image playing process of the liquid crystal display system further comprises the following steps:
identifying and comparing images in the image playing process of the liquid crystal display system with the contents of a preset image library to obtain the frame superposition conditions of different areas and different image contents of the liquid crystal display system;
and evaluating the frame superposition conditions of different areas and different image contents, and counting the response time of the liquid crystal display system by a data analysis method.
8. An apparatus for testing response time of a liquid crystal display system, comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 6.
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