CN109600604B - Contrast testing method, device and computer readable storage medium - Google Patents
Contrast testing method, device and computer readable storage medium Download PDFInfo
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Abstract
The application relates to the field of display equipment, and provides a contrast testing method and device and a computer readable mediumA storage medium, wherein the contrast testing method comprises the steps of: the contrast testing method is characterized by comprising the following steps: obtaining the regional contrast of the marginal field of view of the region to be tested in an ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view; obtaining contrast of central visual field under ideal state
Obtaining the regional contrast of the marginal field of view of the region to be tested under the actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view; the final contrast value of the area to be tested is
The method and the device can improve more accurate measurement results.
Description
Technical Field
The present disclosure relates to the field of display devices, and in particular, to a contrast testing method and apparatus, and a computer-readable storage medium.
Background
Contrast refers to the measurement of different brightness levels between the brightest white and darkest black areas in an image, and a larger difference range represents a larger contrast, and a smaller difference range represents a smaller contrast.
The influence of the contrast on the visual effect is very critical, generally, the higher the contrast is, the clearer and more striking the image is, and the more vivid and gorgeous the color is; and the contrast is low, so that the whole picture is gray. The high contrast ratio is very helpful for the definition, the detail expression and the gray level expression of the image.
In the prior art, a main method for testing the contrast of an image playing device is to use an image capturing lens to simulate human eyes for observation. However, in a new image playback device such as VR (virtual reality), MR (mixed reality), AR (augmented reality), or the like, a large angle of view is generally adopted in order to ensure an immersive experience effect.
In the contrast measurement method adopted in the prior art, a measurement result of an image playing device with a large field angle has a large error.
Disclosure of Invention
In order to solve the above problems or at least partially solve the above technical problems, in one embodiment of the present application, there is provided a contrast testing method including the steps of:
obtaining the regional contrast of the marginal field of view of the region to be tested in an ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
obtaining contrast of central field of view under ideal conditions
Obtaining the regional contrast of the marginal field of view of the region to be tested under the actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the final contrast value of the area to be tested is
Another embodiment of the present application provides a contrast testing apparatus, adapted to an image playback device, including:
the image acquisition lens is arranged right opposite to the display area of the image playing equipment;
the image input medium stores a first graphic card and a second graphic card, wherein the first graphic card is used for testing the contrast in an ideal state, and the second graphic card is used for testing the contrast in an actual situation;
the image input medium is accessed to the image playing device, so that the image playing device can play the content of each graphic card stored in the image input medium to generate an image;
the processing equipment is in communication connection with the image acquisition lens;
the processing device is used for acquiring, through the image acquisition lens:
regional contrast ratio of marginal field of area to be tested under ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
contrast of central field of view under ideal conditions
Regional contrast ratio of marginal field of view of region to be tested under actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the processing equipment is also used for obtaining the final contrast value of the area to be tested as
In the contrast test method and the system thereof, the edge contrast and the center contrast in an ideal state are measured, and the ratio (contrast coefficient) obtained by the edge contrast and the center contrast is the factor coefficient generated by measuring the contrast due to uneven image surface illumination and too low edge illumination. After the regional contrast under the actual condition is multiplied by the regional contrast, the normalization of the regional contrast under the ideal condition on the contrast value of each region is realized, and the influence of brightness nonuniformity of each region on the contrast is eliminated.
Compared with the prior art, the contrast test method and the contrast test system can effectively eliminate the influence of the uneven regional brightness caused by the large field of view on the measurement of the contrast value, and improve the test accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be clear that the drawings in the following description are only intended to illustrate some embodiments of the present application, and that for a person skilled in the art, it is possible to derive from these drawings, without inventive effort, technical features, connections or even method steps not mentioned in the other drawings.
FIG. 1 is a flow chart of a contrast testing method of the present application;
FIG. 2 is a schematic diagram of the operation of the contrast testing apparatus of the present application;
FIG. 3 is a schematic representation of image content of a first graphic card of the present application;
fig. 4 is a schematic diagram of image content of a second graphic card of the present application.
Description of reference numerals:
1-an image acquisition lens; 2-an image input medium; 3-an image playback device; 4-a display area; 5-processing equipment; 6-a lens;
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Implementation mode one
The inventor of the application finds that the contrast testing method in the prior art is difficult to meet the testing requirements in emerging image playing devices such as VR, MR, AR and the like. The reason for this is as follows:
in general, in a large-field optical system, the phenomenon of uneven image plane illumination inevitably occurs, which is represented by the fact that the brightness of the central illumination is greater than that of the edge illumination, and thus the contrast measurement reference of the central field is different from that of the edge field.
Specifically, according to the lambert law, the image plane illuminance decreases by a ratio of 4 th power of the cosine of the off-axis angle.
Namely:
E＝cos4ω；
where E is the image plane illumination and ω is the off-axis angle. In practice, the edge illumination will also be lower due to the vignetting phenomenon. The phenomenon is particularly obvious when wide-angle and large-caliber lenses are used, and the angle of view is larger.
In summary, in the large-field optical system, the image plane illuminance is not uniform, the brightness of the center field is not consistent with that of the edge field, and the standard is different, which is a big cause of inaccuracy of the contrast test result.
In view of the above, a first embodiment of the present application provides a contrast testing method, as shown in fig. 1, including the following steps:
obtaining the regional contrast of the marginal field of view of the region to be tested in an ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
obtaining contrast of central field of view under ideal conditions
Obtaining the regional contrast of the marginal field of view of the region to be tested under the actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the final contrast value of the area to be tested is
Based on the above method, an embodiment of the present application further provides a contrast testing apparatus, which is suitable for an image playing device 3, and as shown in fig. 2, the apparatus includes:
the image acquisition lens 1 is arranged right opposite to the display area 4 of the image playing device 3;
the image input medium 2 stores a first graphic card and a second graphic card, wherein the first graphic card is used for testing the contrast in an ideal state, and the second graphic card is used for testing the contrast in an actual situation;
the image input medium 2 is accessed to the image playing device 3, so that the image playing device 3 can play the content of each graphic card stored in the image input medium 2 to generate an image;
the processing device 5 is in communication connection with the image acquisition lens 1;
the processing device 5 is configured to obtain, through the image capturing lens 1:
regional contrast ratio of marginal field of area to be tested under ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
contrast of central field of view under ideal conditions
Regional contrast ratio of marginal field of view of region to be tested under actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the processing device 5 is further configured to derive the test to be testedThe final contrast value of the region is
In the present application, the image capturing lens 1 may be various industrial wide-angle lenses with large field of view, and the image playing device 3 is correspondingly a large-field-of-view image playing device 3, such as an LCD or OLED display screen in a VR, MR, AR device. In existing VR or AR devices, a lens 6 is often placed in front of the image playback device 3 to form an enlarged virtual image at the display area 4 for viewing by human eyes. The image capture lens 1 may be set at an optimal viewing position of the display area 4 as a simulation of human eyes for acquiring a virtual image of an image generated by the image playback apparatus 3.
The image data obtained by the image pickup lens 1 is transmitted to the processing device 5. The processing device 5 may be a host computer connected to the image capturing lens 1 by wire or wirelessly. With the image recognition program based on artificial intelligence in the related art, quantitative calculation can be performed on image data and a calculation result can be given, and therefore, by calculating the contrast of the virtual image, quantitative evaluation of the image playback apparatus 3 can be obtained.
The image input medium 2 may be various media having a storage function, such as a usb disk, a floppy disk, an optical disk, or various storage mechanisms provided in the apparatus, such as a hard disk or a flash memory. The contents of the graphics card may be stored in the image input medium 2 as virtual data, or may be a dedicated tangible card adapted to the image playback apparatus 3.
Alternatively, x may be any value from 0 to 1, and may in particular be 0.5, 0.7 or 1. And x is the proportion of the field of view of the area to be tested to the full field of view. That is to say, the application can measure the contrast of not only the full field of view, but also the contrast of various marginal fields of view (0.5 field of view, 0.7 field of view, 1 field of view) as required, which has guiding significance in the contrast plotting process of large-field-of-view products. In the present application, when x is defined as 0, the region to be tested is the central region.
Optionally, the area contrast is obtained by measuring an image displayed by the played graphic card on the edge of the area to be tested; the image is provided with squares distributed in an array, and the displayed content in the adjacent squares is different.
The accuracy of measurement can be improved by using the squares distributed in the array. Specifically, in the ideal state, adjacent squares are filled with black and white, respectively.
Expressed on the content of the graphic card, referring to fig. 3, the image of the first graphic card has the squares distributed in an array, and the adjacent squares are filled with black and white, respectively.
The squares may be densely arranged on the first graphic card, or may be arranged only on the peripheral edges. When the grid array mode is adopted, the content of the graphic card or the size of the display area 4 does not need to be adjusted in the process of measuring the 0.5 view field and the 0.7 view field, and the convenience is improved.
Yet further alternatively, in the actual case, the squares are filled with stripes, and the stripes filled by adjacent squares are perpendicular to each other. To improve the testing accuracy, the stripes may be black and white stripes arranged at intervals.
For the content of the graphic card, referring to fig. 4, the image of the second graphic card has squares distributed in an array, the squares are filled with black and white stripes arranged at intervals, and the stripes filled in the adjacent squares are perpendicular to each other.
Similarly, the squares may be densely arranged on the second card, or may be provided only on the peripheral edges.
It is further worth mentioning that a center cross line can be arranged on both the first graphic card and the second graphic card, so as to locate the center point. Squares can be arranged on the first graphic card and the second graphic card, particularly in the center of the first graphic card, and the adjacent squares are respectively filled with black and white, so as to measure the contrast of the central view field obtained under the ideal state
The first embodiment of the present application further provides a contrast testing method based on the above contrast testing system, and please refer to fig. 1 to 4, which provides an operation flow of contrast when testing a full field of view (x is 1), specifically as follows:
1. referring to fig. 2, the image capturing lens 1 is disposed at a position directly facing the display area 4 of the image playing device 3, and is adjusted to be consistent with the visual position of the user, and the image input medium 2 is connected to the image playing device 3 to play the content of the first graphic card. An image of the first card will be displayed in the display area 4 as shown in figure 3.
2. Obtaining the regional contrast of black and white squares of the edge of the area to be tested in the ideal state, namely the edge in the first graphic card
3. Obtaining contrast of central visual field under ideal state
4. Calculating contrast ratio under ideal state
Wherein the content of the first and second substances,
therefore, by means of the contrast coefficient, the normalization of the regional contrast in an ideal state can be realized, and the influence of uneven brightness of each region on contrast measurement is eliminated.
5. The content in the second graphic card is switched to play, and the image of the second graphic card is displayed in the display area 4 as shown in fig. 4. Obtaining the regional contrast of the marginal field of view of the region to be tested under the actual condition
6. And calculating to obtain a final contrast value under the actual condition, wherein the final contrast value is as follows:
as previously mentioned, the present application is equally applicable to contrast testing of central, half, 0.7 fields of view. The difference from the above steps is that the graphic card corresponding to the area to be tested needs to be selected. Or selecting a specific area to be tested in the chart card with densely-arranged grids to obtain the contrast. Within the range of 0 ≦ x ≦ 1, the value of x may be arbitrarily established, i.e., measured at an arbitrary field size.
Typically, when x is 0,
when x is 0.5, the ratio of x,
when x is equal to 0.7,
when x is equal to 1, the first group,
in view of the above, it is desirable to provide,
the specific value of x may be specified as needed, and is not described herein again.
In the contrast test method and the system thereof, the edge contrast and the center contrast in an ideal state are measured, and the ratio (contrast coefficient) obtained by the edge contrast and the center contrast is the factor coefficient generated by measuring the contrast due to uneven image surface illumination and too low edge illumination. After the regional contrast under the actual condition is multiplied by the regional contrast, the normalization of the regional contrast under the ideal condition on the contrast value of each region is realized, so that the measurement reference of the contrast is approximately consistent, and the influence of brightness nonuniformity of each region on the contrast is eliminated.
Compared with the prior art, the contrast test method and the contrast test system can effectively eliminate the influence of the uneven regional brightness caused by the large field of view on the measurement of the contrast value, and improve the test accuracy.
Second embodiment
A second embodiment of the invention provides a computer-readable storage medium, in which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the method of the first embodiment.
The steps can be automatically completed by means of a computer program, and efficiency is improved.
The Processor referred to in this embodiment may be a Central Processing Unit (CPU), but in the alternative, the Processor may be any conventional Processor, controller, microcontroller, state machine, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware component, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server 140, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Or in the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In the contrast test method and the system thereof, the edge contrast and the center contrast in an ideal state are measured, and the ratio (contrast coefficient) obtained by the edge contrast and the center contrast is the factor coefficient generated by measuring the contrast due to uneven image surface illumination and too low edge illumination. After the regional contrast under the actual condition is multiplied by the regional contrast, the normalization of the regional contrast under the ideal condition on the contrast value of each region is realized, and the influence of brightness nonuniformity of each region on the contrast is eliminated.
Compared with the prior art, the contrast test method and the contrast test system can effectively eliminate the influence of the uneven regional brightness caused by the large field of view on the measurement of the contrast value, and improve the test accuracy.
In the various embodiments described above, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated by those of ordinary skill in the art that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one of ordinary skill in the art. In addition, those of ordinary skill in the art will appreciate that embodiments of the present invention set forth numerous technical details for the purpose of providing a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the invention.
Claims (8)
1. A contrast testing method is characterized by comprising the following steps:
obtaining the regional contrast of the marginal field of view of the region to be tested in an ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
obtaining contrast of central visual field under ideal state
Obtaining the regional contrast of the marginal field of view of the region to be tested under the actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the area contrast is obtained by measuring an image displayed by the played graphic card on the edge of the area to be tested, the image has squares distributed in an array, and adjacent squares are respectively filled with black and white in the ideal state; in the actual situation, the grid is filled with stripes;
the final contrast value of the area to be tested is
2. The contrast test method according to claim 1, wherein x is 0.5, 0.7, or 1.
3. The contrast testing method according to claim 1, wherein in the actual case, the stripes filled by adjacent squares are perpendicular to each other.
4. The contrast test method according to claim 1, wherein in the actual case, the stripes are black and white stripes arranged at intervals.
5. A computer-readable storage medium storing a computer program, wherein the computer program stored in the computer-readable storage medium is capable of implementing the steps of any one of claims 1 to 4 when executed by a processor.
6. A contrast testing device is suitable for an image playing device, and is characterized by comprising:
the image acquisition lens is arranged right opposite to the display area of the image playing equipment;
the image input medium stores a first graphic card and a second graphic card, wherein the first graphic card is used for testing the contrast in an ideal state, and the second graphic card is used for testing the contrast in an actual situation;
the image of the first graphic card is provided with grids distributed in an array manner, and the adjacent grids are respectively filled with black and white;
the image of the second graphic card is provided with grids distributed in an array manner, and the grids are filled with stripes;
the image input medium is accessed to the image playing device, so that the image playing device can play the content of each graphic card stored in the image input medium to generate an image;
the processing equipment is in communication connection with the image acquisition lens;
the processing device is used for acquiring, through the image acquisition lens:
regional contrast ratio of marginal field of area to be tested under ideal state
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
contrast of central field of view under ideal conditions
Regional contrast ratio of marginal field of view of region to be tested under actual condition
Wherein x is the proportion of the field of view of the area to be tested to the full field of view;
the processing equipment is also used for obtaining the final contrast value of the area to be tested as
7. The contrast testing apparatus according to claim 6, wherein the squares of the image of the second graphic card are filled with black and white stripes arranged at intervals.
8. The contrast testing apparatus of claim 6, wherein the stripes filled by adjacent tiles of the image of the second graphic card are perpendicular to each other.
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