CN102014297A - Method for testing image quality of high-definition flat-panel TV display - Google Patents
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Abstract
The invention discloses a method for testing the image quality of a high-definition flat-panel TV display. The method provided by the invention comprises the following steps: (1) accessing a video test signal to a display; (2) testing by utilizing a video analyzer, a brightness meter/colorimeter and an oscilloscope; (3) outputting test results; and testing indexes of moving image tailing, moving image color shift, gray response time, gamma change and color shift. By using the technical scheme, the overall quality of a liquid crystal display is well estimated under dynamic images, the estimation comprises the influence of the dynamic images on both brightness and colors, and in addition, image viewing-angle color shift and gamma shift rate are mainly used for measuring the influence of different viewing angles on the brightness and colors of the display. The parameters are considered in row labels but are not considered comprehensively, by adding the items, the method is beneficial to further discriminating current high-definition display products.
Description
Technical field
The present invention relates to the digital processing technology field, be specifically related to the method for testing of Digital Television flat panel television display treatment of picture technology and Digital Television image quality.
Background technology
China electron trade standard SJ/T 11348-2006 " Digital Television flat-panel monitor method of measurement " is to the existing more comprehensive standard of the normal temperature electrical property of panel TV, its display characteristic project comprises indexs such as brightness, contrast, definition, colour gamut coverage rate, and the test and the evaluation of flat-panel monitor product had important directive significance.
SJ/T 11348-2006 " Digital Television flat-panel monitor method of measurement " has defined the display characteristic index of projects such as brightness, contrast, colour gamut coverage rate, angle of visibility, definition and response time as evaluation and test flat panel television display picture quality.Included the lot of essential factors relevant in these indexs, we can say that these key elements have constituted the basis of image quality evaluation with image quality.Measuring condition and the method for measurement of single-definition, high definition digital television flat-panel monitor have been stipulated.
In research and practice process to the method, the present inventor finds to adopt at present advanced treatment technology to realize the high-end display of better image quality, and it is not enough only evaluating and testing with SJ/T 11348-2006.In actual use, especially when evaluating and testing, high-end flat-panel monitor can find these indexs and incomplete all characteristics that characterize product that SJ/T11348-2006 proposes.This main cause wherein is that some other factors relevant with flat panel television display picture quality are not considered fully and evaluated and tested.。At this situation, the present invention is on the basis of using SJ/T 11348-2006, in conjunction with technical characterstic and the development trend that present flat panel television display industry institute extensively adopts, drafted product test method to the flat-panel monitor of high definition and employing frequency multiplication interleave (100/120 Hz etc.) technology.
Summary of the invention
In view of this, the invention provides a kind of method of testing of high definition flat panel television display image quality, on the test basis at high definition lcd tv display image quality test project and method that SJ/T 11348-2006 proposes, also comprise: moving image hangover, moving image color offset, GTG, gal sign indicating number (Gamma) change, the index test of colour shift (Color Shift).By considering the moving image response time, the project of GTG and motion blur color offset reaction and display device dynamic image quality, wherein both comprised the influence of motion picture to brightness, also comprised the influence of motion picture to color, and propose to assess the comprehensive quality of LCD under dynamic menu well at high definition lcd tv display image quality test project and method in conjunction with international relevant criterion.Image aspects color offset wherein, the gamma deviation ratio is mainly weighed the influence of different visual angles to display brightness and colourity.Though these parameters are considered to some extent in rower, are not considered very comprehensively.Increase these projects and help further examination at present high-clear display product.
Technical scheme of the present invention is achieved in that a kind of method of testing of high definition flat panel television display image quality, comprising: (1) is linked into display with video test signals; (2) test through video analyzer, bright/chromascope, oscilloscope; (3) output test result; Described method of testing comprises that also moving image hangover, moving image color offset, GTG, gal sign indicating number change, the index test of colour shift.
Further, described moving image hangover test comprises: (1) is adjusted to the standard operation state with display, will trail that test signal is input to display between timing, the mobile graphics unit on the observation picture; (2) if when the graphic element that is in critical condition is arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, is the positive time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the positive time of the hangover that records; (3) as if all separated attitude of all graphic elements, the negative time test signal that will trail is input to display; If when the elementary area that is in critical condition was arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, be the negative time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the negative time of the hangover that records.
Further, the positive time of described hangover comprises positive time of bright hangover and dark positive time of hangover; The negative time of described hangover comprises negative time of bright hangover and negative time of dark hangover.
Further, described moving image color offset test comprises the test that master color skew and dynamic model are stuck with paste color offset.
Further, the distance of the chromaticity coordinates that master color skew should the zone behind the chromaticity coordinates of chrominance section and the image motion when static by test pattern obtains.
Further, the motion blur color offset obtains by the distance that brightness in the test fuzzy edge is respectively the chromaticity coordinate of 10%, 90% correspondence.
Further, the corresponding time test method of described GTG comprises: (1) adjusts to the specified standard operating state with display; (2) flat-field signal is input to display,, in the 0%-10% scope, measures display in response time of changing of inter-stage twice arbitrarily 10% to be the unit step-length.
Further, described gal sign indicating number changes test and comprises: (1) at the gamma of the normal position measurement screen of screen, the gamma curve of drawing this moment is also calculated gamma value; (2) gamma curve of test screen and calculate gamma value when 15 °, 30 °, 45 °, 60 ° and/or-15 ° ,-30 ° ,-45 ° ,-60 ° visual angles respectively; (3) calculate gamma rate of change, the i.e. rate of change of the gamma value of gamma value and method line position under the different angles.
Further, described colour shift adopts the colour chart visible angle of the aberration restriction of test different colours correspondence on level, vertical and diagonal respectively.
Technique scheme as can be seen, because the embodiment of the invention adopts the moving image response time, the project of GTG and motion blur color offset reaction and display device dynamic image quality, wherein both comprised the influence of motion picture to brightness, also comprised the influence of motion picture, can assess the comprehensive quality of LCD under dynamic menu well color.By increasing these projects perfect to rower, help further examination at present high-clear display product.In a word, by the test of these projects and in conjunction with the conventional project test that defines in the industry standard, can provide the reference of product total quality level better.
Description of drawings
Fig. 1 is the flow chart of the method for testing of high definition flat panel television display image quality of the present invention;
Fig. 2 is the flow chart of measuring the moving image response time;
Fig. 3 is the device connection diagram that GTG is measured.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtained under the creative work prerequisite.
The embodiment of the invention provides a kind of method of testing of high definition flat panel television display image quality, and a kind of method of testing of high definition flat panel television display image quality comprises: video test signals is linked into display; Test through video analyzer, bright/chromascope, oscilloscope; Output test result; Method of testing comprises that also moving image hangover, moving image color offset, GTG, gal sign indicating number change, the index test of colour shift.
As shown in Figure 1, on the basis of using SJ/T 11348-2006, by considering the moving image response time, the project of GTG and motion blur color offset reaction and display device dynamic image quality, wherein both comprised the influence of motion picture to brightness, also comprised the influence of motion picture to color, and propose to assess the comprehensive quality of LCD under dynamic menu well at high definition lcd tv display image quality test project and method in conjunction with international relevant criterion.Below respectively each test event and method are elaborated.
1, moving image hangover: refer to hangover and blooming that dynamic menu shows.It is generally acknowledged that the reason that causes LCD " hangover " is because the liquid crystal response time itself lacks inadequately on the one hand; Be " maintenance " characteristic of LCD on the other hand.Each pixel that is LCD keeps its brightness always in a frame time.Continuingly act on beholder's eyes, and people's eyes have visual persistence, when the picture of LCD switched to next frame, human eye still persisted the content of previous frame picture, and produced " hangover "; And the existence of " hangover " phenomenon is to present flat-panel monitor, and especially the influence of the picture quality when showing dynamic menu is very big, even directly has influence on the preference degree of user to product.
Along with the continuous development of technology, LCD motion diagram image planes face quality has had obvious improvement.In order to evaluate and test the quality of dynamic image quality, the method for testing that characterizes " moving image response time (MPRT) " with motion blur is at first proposed by Japan, and this method is adopted by the VESA standard as the dynamic image quality testing standard of display at present.
Specified test is summarized as follows in VESA FPDM 2.0 Update standards:
Display screen input Y0-Y6 ash electricity combined test figure signal makes figure at the uniform velocity mobile from left to right, cooperates resolution chart to move together with video camera with identical speed.At the middle position cut-away view picture of entire display screen, the right and left of grey level detecting figure occurs fuzzy, and the image abscissa that obtains is Coordinate Conversion t=s δ
t/ δ
n, be unit from being that unit converts to time with the pixel, obtain moving image response curve (MPRC).
MPRT can be expressed as:
In the formula: EBET
IjBe brightness L
iChange to brightness L
jThe fuzzy fringe time of extension, the distance between can 10% and 90% by the MPRC peak-to-peak value obtains divided by 0.8, and N is the combination sum of changing between any two brightness, practical application is divided into 7 five equilibriums with brightness, from L
0(minimum brightness) is to L
6(high-high brightness).Here the basis source that distributes for brightness combination is in the definition of CIE1976 for brightness L, and these brightness values can be obtained by following formula, promptly
Work as L
0/ L
6≤ 0.008856
As shown in Figure 2, testing procedure comprises: (1) is adjusted to the standard operation state with display, will trail that test signal is input to display between timing, observes the mobile graphics unit on the picture;
(2) if when the graphic element that is in critical condition is arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, is the positive time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the positive time of the hangover that records;
(3) as if all separated attitude of all graphic elements, the negative time test signal that will trail is input to display; If when the elementary area that is in critical condition was arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, be the negative time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the negative time of the hangover that records.
Specifically can be divided into:
1) display is adjusted to the standard operation state;
2) test signal between bright hangover timing is input to display, suitable distance is observed the mobile unit on the picture in the indicator screen dead ahead;
When 3) observing the graphic element that just in time is in critical condition, then the reading of this graphic element correspondence multiply by the input signal field duration, is the positive time of bright hangover that records;
4) if do not observe the graphic element that just in time is in critical condition, two graphic elements are but arranged near critical condition, the median of so corresponding reading multiply by the input signal field duration, is the positive time of bright hangover that records;
5) if observed graphic element all is the state of separation, the negative time test signal of bright hangover is input to display, suitable distance is observed the mobile unit on the picture in the indicator screen dead ahead;
When 6) observing the elementary area that just in time is in critical condition, then the reading of this graphic element correspondence multiply by the input signal field duration, is the negative time of the bright hangover that records;
7) if do not observe the graphic element that positive sea is in critical condition, two graphic elements are but arranged near critical condition, the mean value of so corresponding reading multiply by the input signal field duration, is the negative time of the bright hangover that records;
8) survey bright hangover time on the occasion of or negative value;
9) will trail secretly that test signal is input to display between timing, suitably distance is observed mobile unit on the picture in the indicator screen dead ahead;
10) observe the graphic element that just in time is in critical condition, then the reading of this graphic element correspondence multiply by the input signal field duration, is the positive time of dark hangover that records;
11) just in time be not in critical condition figure unit as if observing, two graphic elements but arranged near critical condition, the median of so corresponding reading multiply by the input signal field duration, is the positive time of dark hangover that records;
12) if observed graphic element all is the state of separation, the negative time test signal that will secretly trail is input to display, and suitable distance is observed the mobile unit on the picture in the indicator screen dead ahead;
When 13) observing the elementary area that just in time is in critical condition, then the reading of this graphic element correspondence multiply by the input signal field duration, is the negative time of the dark hangover that records;
14) if do not observe the graphic element that just in time is in critical condition, two graphic elements are but arranged near critical condition, the mean value of so corresponding reading multiply by the input signal field duration, is the negative time of the dark hangover that records;
15) the dark trailing time of surveying on the occasion of or negative value.
2, moving image color offset (MPCS): refer to color that dynamic menu shows and the difference when static.Because character that liquid crystal itself is intrinsic and the retention performance in the liquid crystal display process cause LCD when the representation motion picture, the change of picture color can occur.The user can be because awaring the variation of brightness, tone, chromaticity feel other colors.Therefore, this project also is to the full-color high definition TV picture of representation important factors.
The positive in the world at present extensive studies of the quality evaluation metrics of dynamic menu color, also there is not relevant unified standard, in VESA FPDM 2.0 Update, defined two relevant indexs: moving image chromatic distortion and color separation, but do not provide clear and definite method of testing.In addition, that color separation is primarily aimed at is FS-LCD, different with the displaying principle of the commonly used display of present TV, is not discussed here.Here introduce a kind of feasible method.Adopt colour chart to analyze the colour shift situation of two kinds of forms.The deviation of chrominance section color in face face when master color skew is meant the color of chrominance section in the picture that causes owing to image motion and image freeze.Chromaticity coordinates that should the zone behind the chromaticity coordinates of chrominance section and the image motion when can be by test pattern static, and calculate:
A part in addition, motion blur color offset mainly are to consider the influence for color rendering of the motion blur that produces behind the image color regional movement.The chromaticity coordinate value that brightness in the fuzzy edge is respectively 10%, 90% correspondence during test carries out record, and adopts the method for colour difference to calculate the motion blur color offset, promptly
Because motion blur comprise the motion forward position and after prolong, so motion blur calculates the motion blur color offset, promptly color offset also comprises and rises and decline two parts.
3, GTG: refer to time of changing between any gray scale of display frame.The response time of liquid crystal itself inadequately weak point be a key factor that influences the dynamic menu quality.The response time of traditional sense definition is meant the response time of black and white screen, and promptly picture switches to white and changes to the black needed time from white cut from black.But in actual applications, most of pictures all are to change between different gray scales, therefore, have asked its realistic meanings when measuring gray scale response.Simultaneously, some present treatment technologies, as 120Hz (240Hz) etc. all the GTG of counter plate higher requirement is arranged, be to shorten GTG and make the commercial city usually by Driving technique, incorrect, also can cause some side effects but if this technology is used.Testing procedure:
1) display is adjusted to the specified standard operating state, testing equipment is pressed Fig. 3 and is connected;
2) flat-field signal is input to display,, in the 0%-10% scope, measures display in response time of changing of inter-stage twice arbitrarily 10% to be the unit step-length.
4, gal sign indicating number (Gamma) changes: Gamma refers to the transformational relation curve of screen output voltage and corresponding brightness, is called gamma curve (Gamma Curve).LCD is the same with CRT monitor, and its gamma curve also is non-linear, but different with CRT monitor be that LCD is because its these characteristics of non-self-luminous.Its gal sign indicating number characteristic can change along with the variation of viewing angle.The vary by angle of view change of the difference and the color that will cause the display gray scale of this gal sign indicating number characteristic.
The gamma rate of change mainly refers to the variation characteristic of the gamma of LCD TV along with the visual angle.This index has related request in professional LCD monitor, ITU also launched further investigation to this.Continuous progress along with liquid crystal tv technology.High-end civilian LCD is being pursued more perfect image and is being presented, and the gamma rate of change becomes the objective indicator of its pursuit.
The method of testing of gamma rate of change is as follows:
At first at the gamma of the normal position measurement screen of screen, the gamma curve of drawing this moment is also calculated gamma value; Then respectively ± 15 °, ± 30 °, ± (consider that the LCD TV horizontal view angle generally is symmetrical, can only survey one-sided during actual test) gamma curve of test screen when 45 ° and ± 60 ° of visual angles and calculate gamma value; Calculate the gamma rate of change at last:
Wherein, GSR
nThe gamma value of expression different angles, GSR
0The gamma value of representation line position.
5, colour shift (Color Shift): since the non-self luminous characteristics of LCD with and form colored mechanism.For especially large-sized LCD TV, along with the variation of viewing angle, it almost is inevitable that image color changes with respect to standard color.The colour shift of this variation along with the visual angle generally can not cause big influence to the quality of image, if but the color offset of display is bigger.Especially in the scope of angle of visibility greater than the visual sensitivity of human eye, then can produce bigger influence to the quality of image.
Color offset is represented aberration Δ u ' v '=0.02 in the actual use with the maximum visual angle of aberration restriction.
Method of testing is: adopt the colour chart visible angle of the aberration restriction of test different colours correspondence on level, vertical and diagonal respectively.
Need to prove, contents such as the information interaction between said apparatus and intrasystem each unit, implementation since with the inventive method embodiment based on same design, particular content can repeat no more referring to the narration among the inventive method embodiment herein.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, storage medium can comprise: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.
The above only is embodiments of the invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the method for testing of a high definition flat panel television display image quality comprises:
(1) video test signals is linked into display;
(2) test through video analyzer, bright/chromascope, oscilloscope;
(3) output test result;
It is characterized in that: described method of testing comprises that also moving image hangover, moving image color offset, GTG, gal sign indicating number change, the index test of colour shift.
2. the method for testing of high definition flat panel television display image quality according to claim 1 is characterized in that, described moving image hangover test comprises:
(1) display is adjusted to the standard operation state, will trails that test signal is input to display between timing, observe the mobile graphics unit on the picture;
(2) if when the graphic element that is in critical condition is arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, is the positive time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the positive time of the hangover that records;
(3) as if all separated attitude of all graphic elements, the negative time test signal that will trail is input to display; If when the elementary area that is in critical condition was arranged, then the moving image response curve reading of this graphic element correspondence multiply by the input signal field duration, be the negative time of the hangover that records; If be not in the graphic element of critical condition, and two graphic elements are arranged near critical condition, so the mean value of Dui Ying moving image response curve reading multiply by the input signal field duration, is the negative time of the hangover that records.
3. the method for testing of high definition flat panel television display image quality according to claim 2 is characterized in that, the positive time of described hangover comprises positive time of bright hangover and dark positive time of hangover; The negative time of described hangover comprises negative time of bright hangover and negative time of dark hangover.
4. the method for testing of high definition flat panel television display image quality according to claim 1 is characterized in that: described moving image color offset test comprises the test that master color skew and dynamic model are stuck with paste color offset.
5. the method for testing of high definition flat panel television display image quality according to claim 4 is characterized in that: the distance of the chromaticity coordinates that master color skew should the zone behind the chromaticity coordinates of chrominance section and the image motion when static by test pattern obtains.
6. the method for testing of high definition flat panel television display image quality according to claim 4 is characterized in that: the motion blur color offset obtains by the distance that brightness in the test fuzzy edge is respectively the chromaticity coordinate of 10%, 90% correspondence.
7. the method for testing of high definition flat panel television display image quality according to claim 1 is characterized in that, the corresponding time test method of described GTG comprises:
(1) display is adjusted to the specified standard operating state;
(2) flat-field signal is input to display,, in the 0%-10% scope, measures display in response time of changing of inter-stage twice arbitrarily 10% to be the unit step-length.
8. the method for testing of high definition flat panel television display image quality according to claim 1 is characterized in that, described gal sign indicating number changes test and comprises:
(1) at the gamma of the normal position measurement screen of screen, the gamma curve and calculate gamma value this moment of drawing;
(2) gamma curve of test screen and calculate gamma value when 15 °, 30 °, 45 °, 60 ° and/or-15 ° ,-30 ° ,-45 ° ,-60 ° visual angles respectively;
(3) calculate gamma rate of change, the i.e. rate of change of the gamma value of gamma value and method line position under the different angles.
9. the method for testing of high definition flat panel television display image quality according to claim 1, it is characterized in that described colour shift adopts the colour chart visible angle of the aberration restriction of test different colours correspondence on level, vertical and diagonal respectively.
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| CN105959680A (en) * | 2016-04-29 | 2016-09-21 | 北京牡丹视源电子有限责任公司 | Method and system for evaluating color revivification degree of network camera |
| CN107219429A (en) * | 2017-07-10 | 2017-09-29 | 长春吉湾微电子有限公司 | The outside assessment device and assessment method of a kind of main frame display performance |
| CN110418128A (en) * | 2019-07-19 | 2019-11-05 | 易诚高科（大连）科技有限公司 | Measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display |
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| CN111402769A (en) * | 2020-04-14 | 2020-07-10 | 深圳市华星光电半导体显示技术有限公司 | Method for judging response speed of display panel |
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