CN113709449A - Static 8K ultrahigh definition testing method and device - Google Patents
Static 8K ultrahigh definition testing method and device Download PDFInfo
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Abstract
The invention discloses a static 8K ultra-high definition testing method and a static 8K ultra-high definition testing device, wherein an 8K ultra-high definition composite test chart is obtained through design, and then the 8K ultra-high definition composite test chart displayed on tested equipment is tested by pixel positions, so that the definition of an 8K ultra-high definition display system is effectively tested, and the problem that the definition of the 8K ultra-high definition display system cannot be tested in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of digital display, in particular to a static 8K ultrahigh definition testing method and a static 8K ultrahigh definition testing device.
Background
Compared with a 4K system, the current 8K ultra-high-definition display system belongs to the brand-new system field and parameter configuration from signal acquisition, manufacturing, processing, transmission to receiving and display. The effective pixel number of the 8K ultra-high definition image is 7680 multiplied by 4320, the frame rate is 120Hz, 100Hz, 60Hz or 50Hz, and the scanning mode is line-by-line; the sampling structure of the image signal comprises 4:4:4, 4:2:2 or 4:2:0 and the coding format is 8bit, 10bit or 12bit, and the display equipment needs to adopt an input interface of the HDMI2.1 version. Compared with a 4K ultra-high-definition image, the resolution of the 8K ultra-high-definition image is 4 times that of the 4K image, the data rate is 4 times that of the 4K image, 18Gbps is achieved, and the receiving interface of the display device is upgraded from HDMI 2.0 to HDMI 2.1. At present, no standard test signal and evaluation method specially aiming at evaluating key indexes such as reproduction ratio, definition, chromaticity visual angle, chromaticity volume and the like of UHDTV (8K) ultra-high definition display equipment exist at home and abroad, so how to realize the definition test signal and method of the 8K ultra-high definition display system becomes a problem to be urgently solved at present.
Disclosure of Invention
The invention provides a static 8K ultrahigh definition testing method, which aims to solve the problem that the reproduction rate and definition of an 8K ultrahigh definition display system cannot be tested in the prior art.
In a first aspect, the present invention provides a static 8K ultra-high definition testing method, including: determining the definition and the reproduction rate of the tested display equipment based on the 8K ultrahigh definition composite test chart displayed by the tested display equipment; the 8K ultra-high definition composite test chart comprises: the test device comprises a first circular surface, a horizontal definition test area, a vertical definition test area, a definition typical value test area, a gray level test area and a chromaticity volume test area. The first circular surface is arranged at the center of the display area, the horizontal definition testing area and the vertical definition testing area are arranged on the first circular surface, and the definition typical value testing area, the gray level testing area and the chromaticity volume testing area are distributed on the display area on the basis of being beneficial to testing; adjusting the setting of the tested display equipment to enable the reproduction rate of the 8K ultrahigh definition composite test chart displayed by the tested display equipment to be maximum, performing definition test on the display area based on the horizontal definition test area and the vertical definition test area, and calculating the color gamut coverage rate, the chromaticity visual angle and the chromaticity volume based on the 8K ultrahigh definition composite test chart.
Further, the horizontal definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the vertical central line of the first circular surface;
the vertical definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the horizontal center of the first circular surface;
each wedge television line gradually spreads outwards from the center of the first circular surface, and the wedge television lines are uniformly distributed on the first circular surface.
Further, 36 white lattices are divided in the horizontal direction of the 8K ultrahigh definition composite test chart, and 20 white lattices are divided in the vertical direction of the 8K ultrahigh definition composite test chart;
the upper part, the lower part, the left part and the right part of the 8K ultrahigh-definition composite test chart are provided with black and white frames alternately;
the definition typical value test areas comprise four definition typical value test areas which are respectively arranged at four corners of the test area;
the gray scale testing area is arranged below the first circular surface and is uniformly distributed on two sides of the central line of the display area;
the chromaticity volume test areas are arranged on two sides of the first circular surface and are evenly distributed on two sides of the horizontal and vertical center lines of the display area.
Further, the height of the frames on the upper side and the lower side of the 8K ultrahigh-definition composite test chart is 81 pixels; the width of the left frame and the right frame of the 8K ultrahigh definition composite test chart is 97 pixels; and a first reproduction rate measurement scale is arranged on the upper frame or the lower frame, a second reproduction rate measurement scale is arranged on the left frame or the right frame, and the reproduction rate of the display equipment to be measured is determined through the first reproduction rate measurement scale and the second reproduction rate measurement scale.
Further, performing a sharpness test on the display area based on the horizontal sharpness test area and the vertical sharpness test area, including: and judging whether the black and white line clusters in the horizontal definition testing area and the vertical definition testing area are clear or not so as to determine whether the display area is clear or not.
Further, the method further comprises: judging the gray scale difference displayed by adjacent gray scale blocks based on the gray scale test area, and further determining the gray scale of the display area; and judging the color difference between adjacent blocks based on the chromaticity volume test area, and further determining the color gamut of the display area.
Further, calculating a color gamut coverage, a chromaticity viewing angle and a chromaticity volume based on the 8K ultra-high definition composite test chart, comprising:
measuring chromaticity coordinates of the center of the display region by a luminance colorimeter, and calculating a three-color gamut area S and a gamut coverage GP；
Measuring the chromaticity coordinates of each color block in the chromaticity volume test area, drawing a relation curve of the angle and the color difference of each color, obtaining the change relation between the visual angle and the chromaticity of the display area, and further determining the chromaticity volume of the display area;
the brightness and color parameters X, Y, Z of each color block in the chromaticity volume area are measured by a colorimeter, and the volume of the polyhedron formed in the three-dimensional uniform color space can be calculated by using a formula.
In a second aspect, the present invention also provides a static 8K ultra high definition test system for implementing any of the above methods, the system comprising: a test signal source device and an optical test apparatus;
the test signal source device is used for sending a test signal to the tested equipment;
the optical test equipment is used for determining the inter-area reproduction rate of the composite test chart based on the displayed 8K ultrahigh-definition composite test chart of the tested equipment, adjusting the display setting of the tested equipment to enable the reproduction rate of the displayed 8K ultrahigh-definition composite test chart to be maximum, performing definition test on the display area according to the horizontal definition test area and the vertical definition test area of the composite test chart, and measuring the color gamut coverage rate, the chromaticity visual angle and the chromaticity volume based on the composite test chart.
Further, the horizontal definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the vertical central line of the first circular surface;
the vertical definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the horizontal center of the first circular surface;
each wedge-shaped television line gradually spreads outwards from the center of the first circular surface, and the wedge-shaped television lines are uniformly distributed on the first circular surface;
the horizontal direction of the 8K ultrahigh definition composite test chart is divided into 36 white lattices, and the vertical direction of the 8K ultrahigh definition composite test chart is divided into 20 white lattices;
the upper part, the lower part, the left part and the right part of the 8K ultrahigh-definition composite test chart are provided with black and white frames alternately;
the definition typical value test areas comprise four definition typical value test areas which are respectively arranged at four corners of the test area;
the gray scale testing area is arranged below the first circular surface and is uniformly distributed on two sides of the central line of the display area;
the chromaticity volume test areas are arranged on two sides of the first circular surface and are evenly distributed on two sides of a horizontal central line and a vertical central line of the display area;
the height of the frames on the upper side and the lower side of the 8K ultrahigh-definition composite test chart is 81 pixels;
the width of the left frame and the right frame of the 8K ultrahigh definition composite test chart is 97 pixels;
and a first reproduction rate measurement scale is arranged on the upper frame or the lower frame, a second reproduction rate measurement scale is arranged on the left frame or the right frame, and the reproduction rate of the display equipment to be measured is determined through the first reproduction rate measurement scale and the second reproduction rate measurement scale.
The invention has the following beneficial effects:
according to the invention, the 8K ultrahigh-definition composite test chart is obtained through design, and then the 8K ultrahigh-definition composite test chart displayed on the tested equipment is tested, so that the display indexes such as the reproduction rate, the definition and the like of the 8K ultrahigh-definition display system are tested.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart of a static 8K ultra-high definition testing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an 8K ultra-high definition composite test chart provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a static 8K ultra-high definition test system according to an embodiment of the present invention.
Detailed Description
Aiming at the problem that 8K ultrahigh definition analysis cannot be carried out in the prior art, the embodiment of the invention obtains the 8K ultrahigh definition composite test chart through design, and then realizes effective test on the definition of the 8K ultrahigh definition display system through testing the pixel position of the 8K ultrahigh definition composite test chart displayed on the tested equipment. The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment of the present invention provides a static 8K ultra-high definition testing method, referring to fig. 1, the method includes:
s101, determining the definition and the reproduction rate of the tested display equipment based on the 8K ultrahigh definition composite test chart displayed by the tested display equipment;
s102, adjusting the setting of the tested display equipment to enable the reproduction rate of the 8K ultrahigh-definition composite test chart displayed by the tested display equipment to be maximum, performing definition test on the display area based on the horizontal definition test area and the vertical definition test area, and calculating the color gamut coverage rate, the chromaticity visual angle and the chromaticity volume based on the 8K ultrahigh-definition composite test chart.
That is to say, the embodiment of the invention obtains the 8K ultra-high definition composite test chart through design, and then realizes effective test on the definition of the 8K ultra-high definition display system by testing the pixel position of the 8K ultra-high definition composite test chart displayed on the tested equipment.
Specifically, the embodiment of the invention determines 7680 × 4320 effective pixels, 4:2:0 sampling structure, 8bit coding format, 50Hz field frequency and 18Gbps data rate according to the characteristics and performance index requirements of UHDTV (8K), designs and generates a UHDTV (8K) composite test chart sequence by considering moving image information, and researches a measurement method for the display performance of 8K ultra-high-definition display equipment. As shown in fig. 2, an 8K ultra-high definition composite test chart in an embodiment of the present invention includes a first circular surface, a horizontal definition test region, a vertical definition test region, a definition typical value test region, a gray scale test region, and a chromaticity volume test region, where the first circular surface is disposed at a center position of a display region, the horizontal definition test region and the vertical definition test region are disposed on the first circular surface, and the definition typical value test region, the gray scale test region, and the chromaticity volume test region are distributed on the display region on the basis of facilitating a test;
the horizontal definition testing area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the vertical central line of the first circular surface; the vertical definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the horizontal center of the first circular surface; each wedge television line gradually spreads outwards from the center of the first circular surface, and the wedge television lines are uniformly distributed on the first circular surface.
The horizontal direction of the 8K ultrahigh definition composite test chart is divided into 36 white lattices, and the vertical direction of the 8K ultrahigh definition composite test chart is divided into 20 white lattices; the upper part, the lower part, the left part and the right part of the 8K ultrahigh-definition composite test chart are provided with black and white frames alternately; the definition typical value test areas comprise four definition typical value test areas which are respectively arranged at four corners of the test area; the gray scale testing area is arranged below the first circular surface and is uniformly distributed on two sides of the central line of the display area; the chromaticity volume test areas are arranged on two sides of the first circular surface and are evenly distributed on two sides of the horizontal and vertical center lines of the display area.
The height of the frames on the upper side and the lower side of the 8K ultrahigh-definition composite test chart is a first preset number of pixels; the width of the left frame and the right frame of the 8K ultrahigh definition composite test chart is a second preset number of pixels; and a first reproduction rate measurement scale is arranged on the upper frame or the lower frame, a second reproduction rate measurement scale is arranged on the left frame or the right frame, and the reproduction rate of the display equipment to be measured is determined through the first reproduction rate measurement scale and the second reproduction rate measurement scale.
The numerical values such as the first preset quantity, the second preset quantity and the like can be set according to requirements.
In specific implementation, the embodiment of the present invention determines whether the display area is clear by determining whether the black and white line clusters in the horizontal definition test area and the vertical definition test area are clear.
Judging the gray scale difference displayed by the adjacent gray scale blocks based on the gray scale test area, and further determining the gray scale of the display area;
and meanwhile, judging the color difference between adjacent blocks based on the chromaticity volume test area, and further determining the color gamut of the display area.
And finally, measuring the chromaticity coordinate of the central part of the display area through a luminance colorimeter, and calculating the three-color gamut area S and the gamut coverage rate GP；
Measuring the chromaticity coordinates of all color blocks in the chromaticity volume test area, drawing a relation curve of the angle and the chromatic aberration of each color, obtaining the change relation between the visual angle and the chromaticity of the display area, and further determining the chromaticity volume of the display area;
and measuring the brightness and color parameters X, Y, Z of each color block in the chromaticity volume area by a colorimeter, and calculating the volume of the polyhedron formed in the three-dimensional uniform color space by using a formula.
Generally, the embodiment of the invention stores the 8K ultra-high-definition composite test chart in the BMP format in the standard 8K test signal generator, and displays the tested 8K ultra-high-definition display equipment through the digital HDMI interface. The measurement of the reproduction ratio, the definition, the gray scale, the chromaticity visual angle and the chromaticity volume can be realized through the displayed composite test chart, so that the static 8K ultrahigh definition test is finally realized.
The method according to an embodiment of the invention will be explained and illustrated in detail below by means of a specific example:
the current standard 8K format UHDTV resolution is 7680 × 4320 with horizontal and vertical sharpness limit values of 4320. According to the requirements of image space characteristics and time characteristics of 7680 multiplied by 4320 effective pixel numbers specified in GY/T307-2017 program making and exchanging parameter values of an ultra-high definition television system, the invention designs various standard test signal elements for reproduction rate, static definition, chromaticity visual angle, chromaticity volume and the like in a composite test chart.
In the embodiment of the invention, matlab software is adopted, and pixels of a test image are drawn point by point (namely, RGB values are written in) by programming and combining with the parameter specification of an 8K ultra-high-definition image. In the development process, the data receiving, processing and displaying principle of the 8K ultra-high-definition display device is considered, the distribution of standard test signal elements in a test chart is designed, and the RGB values corresponding to the pixel points are programmed and written into different elements in a corresponding design distribution chart according to the positions, gray levels and chroma of the pixel points.
The format of the 8K ultra-high definition composite test chart is 7680 multiplied by 4320, and the average image level APL of a single frame image is 50 percent; the white lattice size is 206 × 206 pixels; the width and height of the white grid line are both 2 pixels. The composite test chart has 36 white lattices in the horizontal direction and 20 white lattices in the vertical direction (the amplitude ratio is 16: 9). The lattice signal can be used for checking indexes such as geometric distortion, nonlinear distortion, convergence error, color purity and the like of an image displayed by the 8K ultra-high-definition display equipment.
The test area of the embodiment of the present invention will be described in detail below: the 8K ultra-high definition composite test chart has a plurality of ultra-high definition image quality evaluation elements.
The reproduction ratio: the upper, lower, left and right regions of the test chart are designed with black and white frames. The height of the upper and lower frames is 81 pixels, and the width of the left and right frames is 97 pixels. The reproducibility measurement scale was between 90% and 100%, with scale marks, stepping at 1%.
Wedge television line: the central area of the 8K composite test chart has a large circle with the radius of 1664 pixels, and the circle contains 4 groups of wedge-shaped television lines. The static definition can be measured facing an 8K ultra-high definition display device, the static definition comprises horizontal definition and vertical definition, the measuring range is from 1080 television lines to 4320 television lines, and a plurality of definition television line scale marks are arranged at the same time.
The horizontal definition test area is 2 groups of wedge-shaped television line clusters in the vertical direction in the large circle. The definition of the upper wedge-shaped television line cluster varies continuously from 1080 television line to 2160 television line, and the definition of the lower wedge-shaped television line cluster varies continuously from 2160 television line to 4320 television line.
The vertical definition test area is 2 groups of wedge-shaped television line clusters in the horizontal direction in the large circle. The definition of the left wedge-shaped television line cluster varies continuously from 1080 television line to 2160 television line and the definition of the right wedge-shaped television line cluster varies continuously from 2160 television line to 4320 television line.
A separate sharpness representative test area was designed on the 8K composite test plot. The region is four small regions of a left upper part, a right upper part, a left lower part and a right lower part of an outer region of a central great circle, and each small region is provided with 5 grids which are 20 grids in total.
In the 5 squares of the upper left small area are respectively horizontal definition 4320 and 2880 tv line scales, vertical definition 4320 and 2880 tv line scales and 45 degree slant definition 6110 tv line scales.
In the 5 squares of the upper right small area are horizontal definition 1730 and 4320 TV line scales, vertical definition 1730 and 4320 TV line scales and 135 inclined definition 3055 TV line scales.
In the 5 squares of the left lower small area are horizontal definition 4320 and 1440 TV line scales, vertical definition 4320 and 1440 TV line scales, and 135 slant definition 2445 TV line scales.
In the 5 squares of the lower right small area are horizontal definition 2160 and 4320 TV line scales, vertical definition 4320 and 1440 TV line scales, and 45 oblique definition 4075 TV line scales.
Gray scale: 21 squares are horizontally distributed right below the 8K composite test chart, and the average image level APL in the squares varies from 0% to 100%, with 5% of stepping.
Chroma volume: 4 groups of chromaticity blocks are designed in the left and right side areas of the large circle of the 8K composite test chart. The chroma blocks have different hues and saturations based on the consideration of different colors and different brightness in the nature. The RGB values of the four sets of regional chroma blocks are as follows:
red region:
| RGB(255，71，255) | RGB(255，0，255) | RGB(255，0，143) |
| RGB(255，0，90) | RGB(255，0，0) | RGB(255，52，0) |
| RGB(255，97，0) | RGB(255，255，0) | RGB(255，255，156) |
red and green areas:
| RGB(88，0，0) | RGB(255，0，0) | RGB(255，49，0) |
| RGB(255，94，0) | RGB(255，255，0) | RGB(139，255，0) |
| RGB(87，255，0) | RGB(0，255，0) | RGB(0，73，0) |
blue green area:
| RGB(73，255，134) | RGB(0，255，0) | RGB(0，255，135) |
| RGB(0，255，191) | RGB(0，255，255) | RGB(0，129，255) |
| RGB(0，83，255) | RGB(0，0，255) | RGB(82，78，255) |
blue region:
| RGB(0，72，94) | RGB(0，255，255) | RGB(0，129，255) |
| RGB(0，83，255) | RGB(0，0，255) | RGB(104，0，255) |
| RGB(158，0，255) | RGB(255，0，255) | RGB(86，0，97) |
the 8K ultra-high-definition technology can best restore the reality of the picture. When watching 8K ultrahigh-definition display, the audience shows the picture information amount which is 16 times as high as the high definition and 4 times as high as the 4K ultrahigh-definition, the image quality is clearer and finer, the detail expression is more sufficient, the audience can obtain more vivid impression, and the effect similar to that of directly watching by naked eyes can be generated. In order to objectively evaluate the image quality of the 8K ultra-high-definition display, the embodiment of the invention performs evaluation research on a test system, a test signal, a key index and a measurement step of the ultra-high-definition display performance.
The test system for the ultra-high definition display performance of the 8K is mainly composed of standard test signal generation equipment and a signal transmission and terminal display performance test instrument. The standard test signal generating equipment needs to have an 8K ultra-high definition signal generating function, supports an HDMI2.1 interface and supports the input of an external test signal.
In combination with the 8K ultra-high-definition display resolution and the display size, the minimum visual resolution which can be observed by human eyes is considered, and the distance between the optical test equipment and the display equipment to be tested in the test system is researched and determined to be 0.75 times of the height of the display screen.
By combining the characteristics and advantages of the 8K ultra-high-definition display technology, the evaluation method of definition, reproduction rate, color gamut coverage rate, chromaticity visual angle and chromaticity volume in the 8K ultra-high-definition display performance is researched in an important way.
The measurement of definition and reproduction rate is carried out by using a developed 8K ultra-high definition composite test chart;
the measurement of the color gamut coverage should use a static test signal with a bit number of 10 bits in the format of 7680 x 4320: full red (1023,0, 0)/full green (0,1023, 0)/full blue (0, 1023);
the measurement of chromaticity viewing angle uses 9 color signals, colors including red, green, blue, yellow, magenta, cyan, dark skin color, light skin color and gray;
the colorimetric volume is measured using at least 20 color signals, such as black, blue, green, red, cyan, magenta, yellow, white, light blue, light green, light red, light cyan, light magenta, light yellow, blue, violet, spring green, yellow green, bright pink, and the like.
In the measuring process, restoring the image setting of the measured 8K ultra-high-definition display equipment to a factory position; 8K standard test signal equipment outputs an 8K ultra-high definition composite test chart; observing the overlapping position of the periphery of the composite test chart and the display area boundary of the display equipment to be tested, and directly reading the horizontal reproduction rate and the vertical reproduction rate; adjusting the reproduction ratio of the display equipment to be tested, observing a definition typical value area when the reproduction ratio reaches 100%, and judging whether two adjacent pixels, namely black and white, can be clearly distinguished; observing a wedge-shaped line cluster in the central area, judging whether the radius positions of 2 adjacent pixels, namely black and white, can be clearly distinguished, corresponding to the number of television lines at each radius position, and reading the maximum values of horizontal definition and vertical definition; if the reproduction rate cannot reach 100%, the reproduction rate at the moment is recorded, and the definition is tested again.
The 8K standard test signal equipment respectively outputs a color domain coverage rate, a chromaticity visual angle and a chromaticity volume test signal;
measuring chromaticity coordinates of the central area of the screen by using a luminance colorimeter, and then calculating the three-color gamut area S and the gamut coverage rate GP
Observing a color block in a chromaticity view angle area by using a luminance colorimeter, recording chromaticity coordinates, horizontally moving the position of the luminance colorimeter, testing chromaticity rental at each angle by taking 5 degrees as a step length, then measuring chromaticity coordinates of other 8 color blocks and chromaticity coordinates at each angle after shifting angles, drawing a relation curve of the angle and the chromatic aberration of each color, reflecting the change relation of the visible angle and the chromaticity of the to-be-tested 8K ultra-high-definition display equipment, and checking the chromaticity view angle capability of a product;
the chromaticity volume is the volume occupied by the volume of a stereo graph formed by measuring the brightness and chromaticity coordinates displayed by the 8K ultra-high-definition display device in the CIELab chromaticity space. During measurement, the brightness and color parameters X, Y, Z of each color block in the chromaticity volume area are measured by a colorimeter, and the volume of a tetrahedron formed in a three-dimensional uniform color space can be calculated by using a formula.
L* Q＝116×f(YP/YD50)-16a*＝500×[f(XP/XD50)-f(YP/YD50)]
In the formula:
XW，YW，ZW-the source light source references the tristimulus values of the white dots;
XP，YP，ZP-tristimulus values of each primary color Q.
In particular, the measurement method of the present invention comprises:
1) observing the overlapping position of the periphery of the composite test chart and the display area boundary of the display equipment to be tested, and directly reading the horizontal reproduction rate and the vertical reproduction rate;
2) adjusting the reproduction ratio of the display equipment to be tested, observing a definition typical value area when the reproduction ratio reaches 100%, and judging whether two adjacent pixels, namely black and white, can be clearly distinguished; observing a wedge-shaped line cluster in the central area, judging whether the radius positions of 2 adjacent pixels, namely black and white, can be clearly distinguished, corresponding to the number of television lines at each radius position, and reading the maximum values of horizontal definition and vertical definition; if the reproduction rate cannot reach 100%, the reproduction rate at the moment is recorded, and the definition is tested again.
3) Observing a gray level test area, judging whether obvious and perceivable display gray level difference exists between adjacent gray level blocks, and determining the number of the gray level blocks which can be clearly displayed by the display equipment to be tested, namely the gray level;
4) observing the color difference degree between adjacent color blocks in the chromaticity volume area, and judging the color difference between the adjacent color blocks, wherein the larger the difference is, the stronger the color expression capability of the display equipment to be tested in the chromaticity area is, and the larger the color gamut is;
the display performance of the 8K ultra-high-definition display equipment cannot be evaluated based on the original test system and the original test method, and the test instrument, the test signal and the measurement method are completely different. The technical scheme can meet the test requirement of the display performance of the 8K ultrahigh-definition display equipment, accurately obtain the test results of the reproduction ratio, the definition value, the chromaticity visual angle and the chromaticity volume under the 8K ultrahigh-definition display condition, and provide standard test conditions and methods for evaluating the performance of the 8K ultrahigh-definition display equipment.
Accordingly, an embodiment of the present invention provides a static 8K ultra-high definition testing system for implementing any one of the above methods, and referring to fig. 3, the system includes: the device comprises a test signal source device 1, a support frame 2 and an optical test device 3;
the test signal source device 1 is used for sending a test signal to the tested device 4;
the optical test device 3 is configured to determine inter-area reproducibility of the composite test pattern based on the displayed 8K ultra-high definition composite test pattern of the device under test, adjust display settings of the device under test to maximize the reproducibility of the 8K ultra-high definition composite test pattern displayed by the device under test, perform definition test on the display area according to a horizontal definition test area and a vertical definition test area of the composite test pattern, and measure color gamut coverage, chromaticity viewing angle, and chromaticity volume based on the composite test pattern.
The relevant content of the embodiments of the present invention can be understood by referring to the first embodiment of the present invention, and will not be discussed in detail herein.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (9)
1. A static 8K ultra-high definition composite test method is characterized by comprising the following steps:
determining the definition and the reproduction rate of the tested display equipment based on the 8K ultrahigh definition composite test chart displayed by the tested display equipment; the 8K ultra-high definition composite test chart comprises: the display device comprises a first circular surface, a horizontal definition testing area, a vertical definition testing area, a definition typical value testing area, a gray level testing area and a chromaticity volume testing area, wherein the first circular surface is arranged at the center of the display area, the horizontal definition testing area and the vertical definition testing area are arranged on the first circular surface, and the definition typical value testing area, the gray level testing area and the chromaticity volume testing area are distributed on the display area on the basis of facilitating testing;
adjusting the setting of the tested display equipment to enable the reproduction rate of the 8K ultrahigh-definition composite test chart displayed by the tested display equipment to be maximum, performing definition test on the display area based on the horizontal definition test area and the vertical definition test area, and measuring the color gamut coverage rate, the chromaticity visual angle and the chromaticity volume based on the 8K ultrahigh-definition composite test chart.
2. The method of claim 1,
the horizontal definition test area comprises two groups of wedge-shaped television lines which are arranged on the vertical central line of the first circular surface;
the vertical definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the horizontal center of the first circular surface;
each group of the wedge-shaped television lines gradually spreads outwards from the center of the first circular surface, and the wedge-shaped television lines are uniformly distributed on the first circular surface.
3. The method of claim 1,
the horizontal direction of the 8K ultrahigh definition composite test chart is divided into 36 white lattices, and the vertical direction of the 8K ultrahigh definition composite test chart is divided into 20 white lattices;
the upper part, the lower part, the left part and the right part of the 8K ultrahigh-definition composite test chart are provided with black and white frames alternately;
the definition typical value test areas comprise four definition typical value test areas which are respectively arranged at four corners of the test area;
the gray scale testing area is arranged below the first circular surface and is uniformly distributed on two sides of the central line of the display area;
the chromaticity volume test areas are arranged on two sides of the first circular surface and are evenly distributed on two sides of the horizontal and vertical center lines of the display area.
4. The method of claim 3,
the height of the frames on the upper side and the lower side of the 8K ultrahigh-definition composite test chart is a first preset number of pixels;
the width of the left frame and the right frame of the 8K ultrahigh definition composite test chart is a second preset number of pixels;
and a first reproduction rate measurement scale is arranged on the upper frame or the lower frame, a second reproduction rate measurement scale is arranged on the left frame or the right frame, and the reproduction rate of the display equipment to be measured is determined through the first reproduction rate measurement scale and the second reproduction rate measurement scale.
5. The method of any of claims 1-4, wherein performing a sharpness test on the display area based on the horizontal sharpness test area and the vertical sharpness test area comprises:
and judging whether the black and white line clusters in the horizontal definition testing area and the vertical definition testing area are clear or not so as to determine whether the display area is clear or not.
6. The method according to any one of claims 1-4, further comprising:
judging the gray scale difference displayed by adjacent gray scale blocks based on the gray scale test area, and further determining the gray scale of the display area;
and measuring the chromaticity coordinate of each color block based on the chromaticity volume test area, and further determining the color gamut of the display area.
7. The method according to any one of claims 1-4, wherein measuring gamut coverage, chroma perspective and chroma volume based on the 8K ultra-high definition composite test chart comprises:
measuring chromaticity coordinates of the center of the display region by a luminance colorimeter, and calculating a three-color gamut area S and a gamut coverage GP；
Measuring the chromaticity coordinates of each color block in the chromaticity volume test area, drawing a color difference curve of all colors at different angles and the center of an orthogonal display screen, obtaining the change relation between the visual angle and chromaticity of the display area, and further determining the chromaticity view angle of the display area;
and measuring the chromaticity coordinates of each color block in the chromaticity volume test area, respectively measuring the brightness parameters X, Y, Z of each color block in the chromaticity volume area through a brightness chromaticity meter, drawing a polyhedron formed by all colors in a three-dimensional uniform color space, calculating the volume of the polyhedron, and further determining the chromaticity volume of the display area.
8. A static 8K ultra high definition test system for implementing the method of any one of claims 1-7, comprising: a test signal source device and an optical test apparatus;
the test signal source device is used for sending a test signal to the tested equipment;
the optical test equipment is used for determining the inter-area reproduction rate of the composite test chart based on the displayed 8K ultrahigh-definition composite test chart of the tested equipment, adjusting the display setting of the tested equipment to enable the reproduction rate of the displayed 8K ultrahigh-definition composite test chart to be maximum, performing definition test on the display area according to the horizontal definition test area and the vertical definition test area of the composite test chart, and measuring the color gamut coverage rate, the chromaticity visual angle and the chromaticity volume based on the composite test chart.
9. The test system of claim 8,
the horizontal definition test area comprises two groups of wedge-shaped television lines which are arranged on the vertical central line of the first circular surface;
the vertical definition test area comprises two groups of wedge-shaped television lines, and the two groups of wedge-shaped television lines are arranged on the horizontal center of the first circular surface;
each group of wedge-shaped television lines gradually spreads outwards from the center of the first circular surface, and the wedge-shaped television lines are uniformly distributed on the first circular surface;
the horizontal direction of the 8K ultrahigh definition composite test chart is divided into 36 white lattices, and the vertical direction of the 8K ultrahigh definition composite test chart is divided into 20 white lattices;
the upper part, the lower part, the left part and the right part of the 8K ultrahigh-definition composite test chart are provided with black and white frames alternately;
the definition typical value test areas comprise four definition typical value test areas which are respectively arranged at four corners of the test area;
the gray scale testing area is arranged below the first circular surface and is uniformly distributed on two sides of the central line of the display area;
the chromaticity volume test areas are arranged on two sides of the first circular surface and are evenly distributed on two sides of a horizontal central line and a vertical central line of the display area;
the height of the frames on the upper side and the lower side of the 8K ultrahigh-definition composite test chart is 81 pixels;
the width of the left frame and the right frame of the 8K ultrahigh definition composite test chart is 97 pixels;
and a first reproduction rate measurement scale is arranged on the upper frame or the lower frame, a second reproduction rate measurement scale is arranged on the left frame or the right frame, and the reproduction rate of the display equipment to be measured is determined through the first reproduction rate measurement scale and the second reproduction rate measurement scale.
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