CN112839221B - Quantification method and quantification device for definition of display equipment under ambient light - Google Patents
Quantification method and quantification device for definition of display equipment under ambient light Download PDFInfo
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Abstract
The invention relates to a quantization method and a quantization device for the definition of display equipment under ambient light, wherein the quantization method comprises the following steps: acquiring original picture definition of an image to be measured displayed by a display device, wherein the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original picture definition is acquired according to the first pattern and the second pattern; acquiring the actual picture definition of an image to be measured of a display device under ambient light, and acquiring the actual picture definition according to a first area of a first pattern and a second area of a second pattern under the same illumination; and quantizing the definition of the display equipment under the ambient light according to the ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment. The invention is used for quantitatively measuring the picture definition of the display equipment under the ambient light and providing reliable evaluation basis for evaluating the performance of the equipment and improving the definition.
Description
Technical Field
The present invention relates to the field of display devices, and in particular, to a method and an apparatus for quantizing the definition of a display device under ambient light.
Background
With the continuous development of display technologies, display devices have been widely used in various aspects of people's lives, wherein the definition is one of the criteria for evaluating the performance of the display devices, and is not only embodied in the definition of display pictures, but also embodied in the definition of the display devices under actual ambient light. Under the ambient light, the display equipment seriously influences the equipment picture definition due to local reflection caused by the projection of lamplight or window ambient light on the surface of the display equipment, so that quantitative indexes are required to be formulated to measure the picture definition under the ambient light, and a reliable evaluation basis scheme is provided for evaluating the quality of transverse contrast among equipment and improving the equipment definition.
Disclosure of Invention
The present invention is directed to overcome at least one of the above drawbacks of the prior art, and provides a method and an apparatus for quantifying the definition of a display device under ambient light, so as to quantify the definition of a picture of the display device under ambient light, and provide a reliable evaluation basis for evaluating the performance of the display device and improving the definition.
The invention adopts the technical scheme that the method for quantizing the definition of the display equipment under the ambient light comprises the following steps:
acquiring original picture definition of an image to be measured displayed by a display device, wherein the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original picture definition is acquired according to the first pattern and the second pattern;
acquiring actual picture definition of an image to be measured of a display device under ambient light, wherein a first area of a first pattern and a second area of a second pattern under the same illumination are acquired, and the actual picture definition is acquired according to the first area and the second area;
and quantizing the definition of the display equipment under the ambient light according to the ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment.
The invention carries out quantification on the picture definition of the display equipment under the ambient light so as to better evaluate the quality of the display performance of the display equipment and improve the picture definition, and the concrete quantification method comprises the following steps: firstly, acquiring original picture definition, placing display equipment under a non-ambient light condition, and displaying an image to be measured by the display equipment, wherein the image to be measured comprises one or more first patterns and second patterns, the first patterns have a first color, the second patterns have a second color, and the display equipment under the non-illumination condition acquires the original picture definition according to the first patterns and the second patterns; secondly, acquiring actual picture definition, simulating ambient light to be directionally projected to the surface of the display device from a certain direction, keeping the direction of the ambient light and the illumination intensity unchanged in the measuring process, and acquiring the actual picture definition of a first area and a second area under the same illumination, wherein the first area is positioned in the first pattern, and the second area is positioned in the second pattern; and finally, quantizing the definition, and calculating the ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment, and when the actual image definition is used as a numerator and the original image definition is used as a denominator, the larger the ratio is, the higher the definition of the display equipment is. According to the invention, the original picture definition under no ambient light and the actual picture definition under the ambient light are calculated, the display definition of the display equipment under the ambient light is visually quantized according to the ratio of the original picture definition to the actual picture definition under the ambient light, the definition specification of the subjectively judged display equipment is quantized and measured, and the display screen definition evaluation stability is good and the reproducibility is high; and the definition of the display equipment is quantified through the ratio, and when the ratio is smaller than a preset value, the picture definition problem of the display equipment under the ambient light needs to be improved in a targeted manner.
Further, the acquiring an actual picture definition of an image to be measured of the display device under ambient light, wherein a first area of a first pattern and a second area of a second pattern under the same illumination are acquired, and the acquiring the actual picture definition according to the first area and the second area includes:
acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' ═ L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
The specific process of obtaining the actual picture definition of the image to be measured of the display device under the ambient light by measuring the brightness value comprises the following steps: selecting a measurement area, and selecting a first area of a first pattern and a second area of a second pattern under the same illumination; acquiring brightness values of a first area and a second area, acquiring a brightness value L1 of the first area and a brightness value L2 of the second area under the same illumination, wherein the display colors of the first pattern and the second pattern are different, and the brightness values are different under the same illumination; the actual picture definition is calculated according to the luminance value and the formula M' ═ L1-L2|/(L1+ L2). The brightness values of the first area of the first pattern and the second area of the second pattern under the same illumination are obtained, the difference exists between the brightness values obtained by measuring the images to be measured of two different color patterns with the same illumination under simulated environment light, the actual picture definition of the images to be measured under the environment light is calculated through the brightness values, and the display definition effect of the display equipment under the environment light is quantitatively presented through the actual picture definition by utilizing the contrast of the actual picture definition and the original picture definition.
Further, the acquiring actual picture definition of an image to be measured of the display device under ambient light, wherein a first area of a first pattern and a second area of a second pattern under the same illumination are acquired, and the acquiring actual picture definition according to the first area and the second area comprises:
acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' ═ D1 ' -D2 ' |/(D1 ' + D2 ') according to the RGB data signal values D1 ' of the first region of the first pattern and the RGB data signal values D2 ' of the second region of the second pattern.
The invention can also obtain the actual picture definition of the image to be measured of the display device under the ambient light by reading the RGB data signal value, which comprises the following steps: shooting pictures of an image to be measured under ambient light, selecting a specific measurement area from the shot pictures, and selecting a first area of a first pattern and a second area of a second pattern under the same illumination; acquiring RGB data signal values of a first area and a second area, acquiring RGB data signal values D1 'of the first area and RGB data signal values D2' of the second area under the same illumination, wherein the first pattern and the second pattern are different in display color, and the RGB data signal values are different under the same illumination; the actual picture definition is calculated from the RGB data signal values, and calculated according to the formula M ' ═ D1 ' -D2 ' |/(D1 ' + D2 '). The invention simulates the difference of RGB data signal values obtained by measuring the images to be measured of two patterns with different colors and the same illumination under the environment light by shooting the images to be measured under the environment light and acquiring the RGB data signal values of a first area of a first pattern and a second area of a second pattern under the same illumination in the images, calculates the actual picture definition of the images to be measured under the environment light, and quantitatively displays the display definition effect of the display equipment under the environment light through the actual picture definition by utilizing the contrast of the actual picture definition and the original picture definition.
Further, the acquiring the original image definition of the image to be measured displayed by the display device includes:
acquiring the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern;
calculating the original picture definition as M ═ D1-D2|/(D1+ D2) according to the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern.
The invention makes clear calculation process for the definition of the original picture of the image to be measured displayed by the display equipment: the display apparatus displays an image to be measured including a first pattern and a second pattern in a non-illumination condition, and an original picture definition M ═ D1-D2|/(D1+ D2) can be calculated by acquiring RGB data signal values of the first color and RGB data signal values of the second color from a first color possessed by the first pattern itself and a second color possessed by the second pattern itself.
Further, a plurality of first areas of the first pattern and a plurality of second areas of the second pattern under the same illumination are obtained, the image definition is calculated according to the first areas and the second areas respectively, and the actual image definition is obtained according to the average value or the maximum value of the image definition.
In the process of acquiring the actual image definition, the method selects the first area and the second area under the same illumination, can respectively select a plurality of first areas and second areas under the same illumination, or selects a plurality of first areas and corresponding second areas under the same illumination, calculates the image definitions from the first areas and the second areas, and obtains the average value or the maximum value as the actual image definition of the image to be measured through the image definitions. The invention avoids the contingency of the calculation result and improves the accuracy of the calculation result of the actual picture definition through repeated value taking and calculation.
Further, a measuring device is adopted to obtain the brightness value or RGB data signal value of the image to be measured, and the measuring device is a non-contact high-precision high-resolution brightness tester or a camera.
In the invention, a non-contact high-precision high-resolution brightness tester can be used for measuring, sampling and analyzing the brightness value of the image to be measured of the display equipment under the ambient light; the method comprises the steps of shooting an image to be measured under ambient light by using a camera, and measuring, sampling and analyzing RGB data signal values of the shot image.
Further, the image to be measured is a grid-shaped image.
The image to be measured displayed by the display equipment comprises a plurality of first patterns and second patterns, the first patterns have a first color, the second patterns have a second color, the image to be measured is a grid-shaped image, and the first patterns and the second patterns are adjacent and uniformly arranged and can be specifically checkerboard images or stripe images.
Another technical solution adopted by the present invention is a device for quantifying the sharpness of a display device under ambient light, comprising:
the device comprises an original image definition acquisition module, a first image definition acquisition module and a second image definition acquisition module, wherein the original image definition acquisition module is used for acquiring the original image definition of an image to be measured displayed by a display device, the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original image definition is acquired according to the first pattern and the second pattern;
the device comprises an actual picture definition acquisition module, a first image definition acquisition module and a second image definition acquisition module, wherein the actual picture definition of an image to be measured of the display equipment under ambient light is acquired according to a first area of a first pattern and a second area of a second pattern under the same illumination;
and the quantized definition module is used for quantizing the definition of the display equipment under the ambient light according to the ratio of the original image definition to the actual image definition, and the ratio is in direct proportion to the definition of the display equipment.
The invention quantizes the picture definition of the display equipment under the ambient light by adopting the quantizing device so as to better evaluate the display performance of the display equipment and improve the picture definition, and the structure of the quantizing device is as follows: firstly, acquiring original picture definition through an original picture definition acquisition module, placing display equipment under a lighting condition without ambient light, and displaying an image to be measured by the display equipment, wherein the image to be measured comprises one or more first patterns and second patterns, the first patterns have a first color, the second patterns have a second color, and the display equipment under the lighting condition does not acquire the original picture definition according to the first patterns and the second patterns; secondly, acquiring actual picture definition through an actual picture definition acquisition module, simulating ambient light to be directionally projected to the surface of the display device from a certain direction, keeping the direction of the ambient light and the illumination intensity unchanged in the measurement process, and acquiring actual picture definition of a first area and a second area under the same illumination, wherein the first area is positioned in the first pattern, and the second area is positioned in the second pattern; and finally, performing definition quantization through a quantization definition module, and calculating a ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment, and when the actual image definition is used as a numerator and the original image definition is used as a denominator, the larger the ratio is, the higher the definition of the display equipment is. According to the invention, the original picture definition under no ambient light and the actual picture definition under the ambient light are calculated, the display definition of the display equipment under the ambient light is visually quantized according to the ratio of the original picture definition to the actual picture definition under the ambient light, the definition specification of the subjectively judged display equipment is quantized and measured, and the display screen definition evaluation stability is good and the reproducibility is high; and the definition of the display equipment is quantified through the ratio, and when the ratio is smaller than a preset value, the picture definition problem of the display equipment under the ambient light needs to be improved in a targeted manner.
Further, the actual picture sharpness obtaining module is specifically configured to:
acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' ═ L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
Further, the actual picture sharpness obtaining module is specifically configured to:
acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' ═ D1 ' -D2 ' |/(D1 ' + D2 ') according to the RGB data signal values D1 ' of the first region of the first pattern and the RGB data signal values D2 ' of the second region of the second pattern.
Compared with the prior art, the invention has the beneficial effects that: according to the method and the device for quantizing the definition of the display equipment under the ambient light, the original picture definition without the ambient light and the actual picture definition under the ambient light are calculated, the display definition of the display equipment under the ambient light is intuitively quantized according to the ratio of the original picture definition without the ambient light and the actual picture definition under the ambient light, the definition specification of the display equipment which is subjectively judged is quantized and measured, the evaluation stability of the definition of the display screen is good, and the reproducibility is high; and the definition of the display equipment is quantified through the ratio, and when the ratio is smaller than a preset value, the picture definition problem of the display equipment under the ambient light is improved in a targeted manner.
Drawings
Fig. 1 is a flowchart illustrating a method for quantifying the sharpness of a display device under ambient light according to the present invention.
Fig. 2 is an image to be measured displayed by the display device of the present invention under no ambient light condition.
FIG. 3 is a schematic diagram of a measuring apparatus used in the quantization method of the present invention.
Fig. 4 is an image to be measured displayed by the display device of the present invention under ambient light conditions.
Fig. 5 is a schematic structural diagram of a device for quantifying the sharpness of a display device under ambient light according to the present invention.
Detailed Description
The drawings are only for purposes of illustrating embodiments of the invention and are not to be construed as limiting the invention.
Example 1
As shown in fig. 1, the method for quantifying the definition of a display device under ambient light according to this embodiment includes the following steps:
s101, acquiring original picture definition of an image to be measured displayed by a display device, wherein the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original picture definition is acquired according to the first pattern and the second pattern;
as a preferred embodiment of the present embodiment, the image to be measured is a raster image.
As a preferred implementation manner of this embodiment, the step S101 includes:
acquiring RGB data signal values D1 of the first pattern and RGB data signal values D2 of the second pattern;
calculating the original picture definition as M ═ D1-D2|/(D1+ D2) according to the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern.
Specifically, the image to be measured includes a plurality of first patterns and second patterns, the first patterns have a first color, the second patterns have a second color, the sizes of the first patterns and the second patterns may be the same or different, when the sizes of the first patterns and the second patterns are the same, the image to be measured may be a raster image, specifically, other first patterns and second patterns such as a checkerboard image or a stripe image are adjacent and uniformly distributed image types, and the first color and the second color may be selected from black and white/red/green/blue, as shown in fig. 2, in this embodiment, a black and white checkerboard is specifically selected as the sharpness of the image quantization display device to be measured.
Specifically, in step S101, the original image definition of the image to be measured displayed by the display device is obtained, and first, the display device is placed in a standard darkroom environment, and at this time, the interference factor of the ambient light is eliminated; then, inputting the image to be measured of the black and white checkerboard shown in fig. 2 to the display device, and displaying the checkerboard picture by the display device; since the checkerboard is a black-and-white checkerboard, the first pattern is a white checkerboard, the second pattern is a black checkerboard (the first pattern may be a black checkerboard, and the second pattern may be a white checkerboard), the RGB data signal value D1 of the first pattern in the black-and-white checkerboard is 255, the RGB data signal value D2 of the second pattern is 0, and the original screen resolution M ═ 255-0 |/(D1+ D2) can be calculated as 1 according to the formula M ═ D1-D2|/(D1+ D2).
S102, acquiring the actual picture definition of an image to be measured of a display device under ambient light, wherein a first area of a first pattern and a second area of a second pattern under the same illumination are acquired, and the actual picture definition is acquired according to the first area and the second area;
as a preferred implementation manner of this embodiment, the step S102 specifically includes:
acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' ═ L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
As another preferred implementation manner of this embodiment, the step S102 specifically includes:
acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' ═ D1 ' -D2 ' |/(D1 ' + D2 ') according to the RGB data signal values D1 ' of the first region of the first pattern and the RGB data signal values D2 ' of the second region of the second pattern.
As a preferred embodiment of this embodiment, a first area of a plurality of first patterns and a second area of a plurality of second patterns under the same illuminance are acquired, picture sharpness is calculated from the first area and the second area, respectively, and actual picture sharpness is acquired from an average value or a maximum value of the plurality of picture sharpness.
As a preferred embodiment of this embodiment, a measuring device is used to obtain a picture sharpness brightness value or an RGB data signal value of the image to be measured, and the measuring device is a non-contact high-precision high-resolution brightness tester or a camera. Specifically, the non-contact high-precision high-resolution luminance tester is a CCD luminance and chrominance analyzer.
Specifically, when the brightness value of the image to be measured is obtained, the measurement device as shown in fig. 3 is used to simulate ambient light and obtain image definition for the display device, and a modulatable directional light source and a grating are used to simulate the ambient light to be projected onto the surface of the display device, in this embodiment, the directional light source and the grating are specifically used to be projected onto the surface of the display device at 45 degrees, and a non-contact high-precision high-resolution brightness tester, such as a CCD luminance and chromaticity analyzer, is used to place at a certain viewing angle to capture the brightness value of the image and record data for the display device.
As shown in fig. 4, the image to be measured is displayed by the display device under ambient light, the simulated ambient light forms two different illuminations of the bright and dark checkerboards on the display device, the CCD luminance and chromaticity analyzer obtains luminance values of the first region of the first pattern and the second region of the second pattern under the same illumination, specifically, the CCD luminance and chromaticity analyzer captures luminance values of two sampling points at the boundary of adjacent black and white squares in the black and white checkerboards as LV1 and LV2, respectively, and assuming that the measured luminance value LV1 is 300nits and the luminance value LV2 is 10nits, the actual picture definition M '═ 300-20|/(300+20) ═ 0.875 is calculated by substituting the formula M' ═ D1 '-D2' |/(D1 '+ D2').
Specifically, when the RGB data signal values of the image to be measured are obtained, the measuring device is used to simulate the ambient light and obtain the image definition of the display device, and the modulatable directional light source and the modulatable grating are used to simulate the ambient light to be projected onto the surface of the display device.
The camera shoots an image to be measured displayed by a display device under ambient light, RGB data signal values of two sampling points at the boundary of adjacent black and white grids in the picture read by a color picker according to the shot picture are respectively D1 'and D2', and if the RGB data signal value D1 'of the read sampling point is 253 and the RGB data signal value D2' is 18, the actual picture definition M '| 253-18 |/(D1' + D2 ') is calculated by substituting the formula M' | D1 '-D2' |/(D1 '+ D2') to 0.867.
Specifically, in the embodiment, it is enumerated that one sampling point measurement is performed on a first area of a first pattern and a second area of a second pattern, a plurality of sampling points with the same illuminance may also be performed on the first area and the second area, the illuminances of all the sampling points in the first area and the second area are the same, or a plurality of sampling points with different illuminances in the first area and the second area may also be sampled, the illuminances of the sampling points in the first area and the sampling points in the second area are in one-to-one correspondence, but the illuminances of the sampling points in the first/second area are different, the sampling points in the first area and the sampling points corresponding to the second area are calculated according to the above formula to obtain a plurality of image definitions, and an average value or a maximum value of the plurality of image definitions is obtained as an actual image definition of an image to be measured.
Specifically, the present embodiment specifically recites sampling measurement of one first pattern and one second pattern to obtain the actual picture definition of the image to be measured of the display device under the ambient light, and may also perform sampling measurement on a plurality of first patterns and second patterns, and find the average value or the maximum value thereof as the actual picture definition of the image to be measured.
The checkerboard picture, the brightness and the position of the directional light source, the size and the position of the grating and the like are all adjustable, but the picture definition of the display device under a certain specific ambient light is measured to be constant.
S103, quantifying the definition of the display equipment under the ambient light according to the ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment.
Specifically, by obtaining the original picture definition M and the actual picture definition M ', the picture display definition effect under the actual ambient light is quantized and measured by using a ratio M'/M, wherein the larger the ratio is, the clearer the picture display definition effect is, 1 is an optimal value, and 0 is a worst value.
Specifically, the display definition of the display device under the ambient light can be quantified through the ratio M'/M, the obtained ratio is compared with a preset value, the preset value can be set according to an actual manufacturing standard, whether the display definition of the display device meets the factory production standard or not is judged, for the display device in the manufacturing process, whether the display device meets the standard or not is quantitatively tested through the evaluating method, and if the display device does not meet the standard, the picture definition of the display device under the ambient light can be improved according to the quantitative index pertinence.
Example 2
As shown in fig. 5, another technical solution adopted by the present invention is an apparatus for quantifying the sharpness of a display device under ambient light, including:
an original picture definition acquiring module 100, configured to acquire an original picture definition of an image to be measured displayed by a display device, where the image to be measured includes a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original picture definition is acquired according to the first pattern and the second pattern;
as a preferred implementation of this embodiment, the original frame sharpness obtaining module 100 specifically includes:
acquiring the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern;
calculating the original picture definition as M ═ D1-D2|/(D1+ D2) according to the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern.
Specifically, the image to be measured includes a plurality of first patterns and second patterns, the first patterns have a first color, the second patterns have a second color, the sizes of the first patterns and the second patterns may be the same or different, when the sizes of the first patterns and the second patterns are the same, the image to be measured may be a raster image, specifically, the first patterns and the second patterns such as a checkerboard image or a stripe image are image types that are adjacent and uniformly distributed, and the first color and the second color may be selected from black and white/red/green/blue, in this embodiment, a black and white checkerboard is specifically selected as the definition of the image quantization display device to be measured.
Specifically, the process of acquiring the original image definition of the image to be measured displayed by the display device by the original image definition acquiring module 100 includes, first, placing the display device in a standard darkroom environment, and at this time, eliminating the interference factor of ambient light; then, inputting the image to be measured with black and white checkerboards to display equipment for checkerboard picture display; since the checkerboard is a black-and-white checkerboard, the first pattern is a white checkerboard, the second pattern is a black checkerboard (the first pattern may be a black checkerboard, and the second pattern may be a white checkerboard), the RGB data signal value D1 of the first pattern in the black-and-white checkerboard is 255, the RGB data signal value D2 of the second pattern is 0, and the original screen resolution M ═ 255-0 |/(D1+ D2) can be calculated as 1 according to the formula M ═ D1-D2|/(D1+ D2).
An actual picture sharpness obtaining module 200, configured to obtain an actual picture sharpness of an image to be measured of the display device under ambient light, where the actual picture sharpness is obtained according to a first region of the first pattern and a second region of the second pattern under the same illuminance;
as a preferred implementation manner of this embodiment, the actual picture sharpness obtaining module 200 specifically includes:
Acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' ═ L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
As another preferred implementation manner of this embodiment, the actual picture sharpness obtaining module 200 specifically includes:
acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' ═ D1 ' -D2 ' |/(D1 ' + D2 ') according to the RGB data signal values D1 ' of the first region of the first pattern and the RGB data signal values D2 ' of the second region of the second pattern.
As a preferred embodiment of this embodiment, a first area of a plurality of first patterns and a second area of a plurality of second patterns under the same illuminance are acquired, picture sharpness is calculated from the first area and the second area, respectively, and actual picture sharpness is acquired from an average value or a maximum value of the plurality of picture sharpness.
As a preferred embodiment of this embodiment, a measuring device is used to obtain a picture sharpness brightness value or an RGB data signal value of the image to be measured, and the measuring device is a non-contact high-precision high-resolution brightness tester or a camera. Specifically, the non-contact high-precision high-resolution luminance tester is a CCD luminance and chrominance analyzer.
Specifically, when the brightness value of the image to be measured is obtained, the adopted measuring device performs simulation of ambient light and obtaining of image definition on the display device, and the modulatable directional light source and the modulatable grating simulate the ambient light to be projected on the surface of the display device, in this embodiment, the directional light source and the grating are specifically adopted to be projected on the surface of the display device at 45 degrees, and a non-contact high-precision high-resolution brightness tester, such as a CCD luminance and chromaticity analyzer, is placed at a certain viewing angle to capture the image brightness value and record data on the display device.
The non-contact high-precision high-resolution brightness tester acquires brightness values of a first area of a first pattern and a second area of a second pattern under the same illumination, specifically, the non-contact high-precision high-resolution brightness tester captures brightness values of two sampling points at a boundary of adjacent black and white grids in a black and white checkerboard as LV1 and LV2 respectively, and the measured brightness value LV1 is 300nits and the brightness value LV2 is 10nits, and the actual picture definition M '| 300-20| (300+20) | is calculated by substituting the formula M' | D1 '-D2' |/(D1 '+ D2 |, wherein the actual picture definition M' |300-20| (300+20) | 0.875.
Specifically, when the RGB data signal values of the image to be measured are obtained, the measuring device is used to simulate the ambient light and obtain the image definition of the display device, and the modulatable directional light source and the modulatable grating are used to simulate the ambient light to be projected onto the surface of the display device.
The camera shoots an image to be measured displayed by a display device under ambient light, RGB data signal values of two sampling points at the boundary of adjacent black and white grids in the picture read by a color picker according to the shot picture are respectively D1 'and D2', and if the RGB data signal value D1 'of the read sampling point is 253 and the RGB data signal value D2' is 18, the actual picture definition M '| 253-18 |/(D1' + D2 ') is calculated by substituting the formula M' | D1 '-D2' |/(D1 '+ D2') to 0.867.
Specifically, in the embodiment, it is enumerated that one sampling point measurement is performed on a first area of a first pattern and a second area of a second pattern, a plurality of sampling points with the same illuminance may also be performed on the first area and the second area, the illuminances of all the sampling points in the first area and the second area are the same, or a plurality of sampling points with different illuminances in the first area and the second area may also be sampled, the illuminances of the sampling points in the first area and the sampling points in the second area are in one-to-one correspondence, but the illuminances of the sampling points in the first/second area are different, the sampling points in the first area and the sampling points corresponding to the second area are calculated according to the above formula to obtain a plurality of image definitions, and an average value or a maximum value of the plurality of image definitions is obtained as an actual image definition of an image to be measured.
Specifically, the present embodiment specifically recites sampling measurement of the first pattern and the second pattern to obtain the actual picture definition of the image to be measured of the display device under the ambient light, and may further perform sampling measurement on a plurality of first patterns and second patterns, and find an average value or a maximum value thereof as the actual picture definition of the image to be measured.
The checkerboard picture, the brightness and the position of the directional light source, the size and the position of the grating and the like are all adjustable, but the picture definition of the display device under a certain specific ambient light is measured to be constant.
A quantized sharpness module 300, configured to quantize the sharpness of the display device under ambient light according to a ratio of the original picture sharpness and the actual picture sharpness, where the ratio is proportional to the sharpness of the display device.
Specifically, by obtaining the original picture definition M and the actual picture definition M ', the picture display definition effect under the actual ambient light is quantized and measured by using a ratio M'/M, wherein the larger the ratio is, the clearer the picture display definition effect is, 1 is an optimal value, and 0 is a worst value.
The embodiment of the invention has the beneficial effects that: according to the method and the device for quantizing the definition of the display equipment under the ambient light, the original picture definition without the ambient light and the actual picture definition under the ambient light are calculated, the display definition of the display equipment under the ambient light is intuitively quantized according to the ratio of the original picture definition without the ambient light and the actual picture definition under the ambient light, the definition specification of the display equipment which is subjectively judged is quantized and measured, the evaluation stability of the definition of the display screen is good, and the reproducibility is high; and the definition of the display equipment is quantified through the ratio, and when the ratio is smaller than a preset value, the picture definition problem of the display equipment under the ambient light is improved in a targeted manner.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. A method for quantifying the sharpness of a display device in ambient light, comprising:
acquiring original picture definition of an image to be measured displayed by a display device, wherein the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original picture definition is acquired according to the first pattern and the second pattern;
acquiring actual picture definition of an image to be measured of a display device under ambient light, wherein a first area of a first pattern and a second area of a second pattern under the same illumination are acquired, and the actual picture definition is acquired according to the first area and the second area;
quantifying the definition of display equipment under ambient light according to the ratio of the original image definition to the actual image definition, wherein the ratio is in direct proportion to the definition of the display equipment;
The original image definition is acquired when the display equipment is placed in a standard darkroom environment to display the image to be measured;
the ambient light is simulated using a modulatable directional light source and a modulatable grating projected onto a display device surface.
2. The method for quantifying the definition of the display device under the ambient light according to claim 1, wherein the obtaining the actual picture definition of the image to be measured of the display device under the ambient light, wherein a first region of a first pattern and a second region of a second pattern under the same illumination are obtained, and the obtaining the actual picture definition according to the first region and the second region comprises:
acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' = | L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
3. The method for quantifying the definition of the display device under the ambient light according to claim 1, wherein the obtaining the actual picture definition of the image to be measured of the display device under the ambient light, wherein a first region of a first pattern and a second region of a second pattern under the same illumination are obtained, and the obtaining the actual picture definition according to the first region and the second region comprises:
Acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' = | D1 ' -D2 ' |/(D1 ' + D2 ') from the RGB data signal value D1 ' of the first region of the first pattern and the RGB data signal value D2 ' of the second region of the second pattern.
4. The method for quantifying the definition of the display device under the ambient light according to claim 1, wherein the obtaining the original picture definition of the image to be measured displayed by the display device comprises:
acquiring the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern;
calculating the original picture definition as M = | D1-D2|/(D1+ D2) according to the RGB data signal values D1 of the first pattern and the RGB data signal values D2 of the second pattern.
5. The method according to claim 1, wherein a plurality of first regions of the first pattern and a plurality of second regions of the second pattern are obtained, a plurality of picture resolutions are respectively calculated, and the actual picture resolution is obtained according to an average value or a maximum value of the plurality of picture resolutions.
6. The method for quantifying the definition of a display device under ambient light according to claim 1, wherein the image definition of the image to be measured is obtained by using a measuring device, wherein the measuring device is a video camera or a non-contact high-precision high-resolution brightness tester.
7. The method according to claim 1, wherein the image to be measured is a grid-like image.
8. An apparatus for quantifying sharpness of a display device in ambient light, comprising:
the device comprises an original image definition acquisition module, a first image definition acquisition module and a second image definition acquisition module, wherein the original image definition acquisition module is used for acquiring the original image definition of an image to be measured displayed by a display device, the image to be measured comprises a first pattern and a second pattern, the first pattern has a first color, the second pattern has a second color, and the original image definition is acquired according to the first pattern and the second pattern;
the device comprises an actual image definition acquisition module, a first image definition acquisition module and a second image definition acquisition module, wherein the actual image definition acquisition module is used for acquiring the actual image definition of an image to be measured of a display device under ambient light, acquiring a first area of a first pattern and a second area of a second pattern under the same illumination, and acquiring the actual image definition according to the first area and the second area;
The quantized definition module is used for quantizing the definition of the display equipment under the ambient light according to the ratio of the original image definition to the actual image definition, and the ratio is in direct proportion to the definition of the display equipment;
and the original image definition is acquired when the display equipment is placed in a standard darkroom environment to display the image to be measured, and the environment light is simulated by adopting a modulatable directional light source and a modulatable grating to project on the surface of the display equipment.
9. The apparatus for quantizing definition of a display device under ambient light according to claim 8, wherein the actual picture definition obtaining module is specifically configured to:
acquiring a luminance value L1 of a first region of the first pattern and a luminance value L2 of a second region of the second pattern;
the actual picture definition M' = | L1-L2|/(L1+ L2) is calculated from the luminance value L1 of the first region of the first pattern and the luminance value L2 of the second region of the second pattern.
10. The apparatus for quantizing definition of a display device under ambient light according to claim 8, wherein the actual picture definition obtaining module is specifically configured to:
Acquiring RGB data signal values D1 'of a first region of the first pattern and RGB data signal values D2' of a second region of the second pattern;
the actual picture definition is calculated as M ' = | D1 ' -D2 ' |/(D1 ' + D2 ') from the RGB data signal value D1 ' of the first region of the first pattern and the RGB data signal value D2 ' of the second region of the second pattern.
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