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Similar standardsSJ/T 11590-2016: A subjective method for the evaluation of the displaying quality of LED displays---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/SJT11590-2016SJ ELECTRONIC INDUSTRY STANDARD ICS 31.120 L 63 Filing No.. A subjective method for the evaluation of the displaying quality of LED displays Issued on. JANUARY 15, 2016 Implemented on. JUNE 01, 2016 Issued by. Ministry of Industry and Information Technology of PRC Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Basic conditions and scoring criteria... 5 5 Testing and evaluation... 7 6 Evaluation procedures and guidelines... 13 Appendix A (Normative) List of formats of test file number... 15 Appendix B (Normative) Scoring table by times... 16 Appendix C (Normative) Summary of scores by observer... 19 Appendix D (Normative) Weight and score of evaluation item... 21ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that certain contents of this standard may involve patents. The issuing organization of this standard does not bear the responsibility for identifying these patents. This standard shall be under the jurisdiction of the Electronics Industry Standardization Research Institute of the Ministry of Industry and Information Technology. Drafting organizations of this standard. Shanghai Sansi Technology Development Co., Ltd., Xi'an Qingsong Technology Co., Ltd., Shenzhen Lianjian Optoelectronics Co., Ltd., Nanjing Luopu Co., Ltd. The main drafters of this standard. Cheng Deshi, Li Dahong, Xu Yongfu, Liu Hanping, Lan Lan. A subjective method for the evaluation of the displaying quality of LED displays1 ScopeThis standard specifies the subjective evaluation method for the displaying quality of LED displays. This standard applies to the subjective evaluation, of the displaying quality of indoor and outdoor full-color LHD displays, that are broadcast and controlled by a computer AND mainly display video images, animations, pictures. This standard does not apply to LED displays, that mainly display text information, such as variable information signs, urban traffic guidance signs, bank and securities market information.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 7401-1987 Method of subjective assessment of quality of color TV pictures SJ/T 11141-2012 Generic specification for LED panels SJ/T 11281-2007 Test methods of LED panels3 Terms and definitions3.1 Subjective evaluation A method, that directly uses the observer's subjective reaction to the image of the system under test, to determine the performance of the system under test. 3.2 Quality evaluation A subjective evaluation of the performance of the tested display system, under certain viewing conditions. 3.3 Test image An image or image sequence, which has specific requirements on the image material, AND is used for the subjective evaluation of the system under test. 3.4 Rating scale The scoring scale, which is used in subjective evaluation.4 Basic conditions and scoring criteria4.1 Basic observation conditions Unless otherwise specified, subjective evaluation shall be carried out under the conditions, which are specified in Table 1.When other observation conditions are required for individual specific evaluation items, they shall be explained separately in the evaluation items. 4.2 Test material A set of discs, which contain static images and moving images, of different resolutions. During evaluation, select the appropriate test image resolution, according to the resolution and aspect ratio of the display. 4.4 Scoring criteria It adopts a five-level subjective image quality evaluation method. Table 2 shows the corresponding relationship, between the subjective evaluation and the score.5 Testing and evaluation5.1 Definition of static image According to the resolution of the display under test, select a set of sharpness test card SD-01 and SD-02, which is suitable for its resolution AND can reflect the details of the image. 5.2 Definition of moving images According to the resolution of the tested display, select a group of dynamic definition test videos MD-01 ~ MD-02, that are suitable for its resolution AND can reflect the definition of the moving image. Observe from the front, on whether the license plate of the car, which is driving at high speed, is identifiable; whether the face of athletes, who is running, is clearly identifiable; whether there is obvious tailing phenomenon. 5.5 Assembly precision Under the condition that the 128-level full-white image test card (W-128) is displayed on the full screen, observe from the front and side, respectively, on whether there are bright lines, which are higher than normal brightness, OR dark lines, which are lower than normal brightness, at the joints of the module and cabinet. It will be evaluated, according to the quality degree. See Table 7, for the scoring of assembly precision. 5.7 Grayscale performance 2 (false contour phenomenon) According to the resolution of the display under test, display the "round moon" video test file MOON-01; the ambient brightness is the low value under the conditions of use. 5.8 Flyback line or stroboscopic phenomenon Select the horizontal bar test image (the bar height is greater than 64 pixels) HLINE-01, that can display non-grayscale (dark, low-bright, medium-bright, high-bright). The observer observes the display, by clicking teeth, shaking heads (nodding), blink, shaking the palm of hand, etc. 5.9 Virtual image phenomenon The test image DLINE-01 (low-density diagonal stripes), which shows the white diagonal stripes on a black background; the ambient brightness is the low value under the conditions of use; the observation distance is about 1000 times the pixel pitch. 5.10 Image stability On the test image DLINE-02 (high-density diagonal stripes), which shows white diagonal stripes on black background, observe whether the displayed image has unstable phenomena such as jitter, fluctuation, bounce, twitch. According to the degree of instability, make grading and scoring. See Table 12 for the scoring of image stability.6 Evaluation procedures and guidelines6.1 Test broadcast control device The standard output interface of the test broadcast control device is DVI or HDMI. If there are N displays, for comparison and evaluation, it must use a DVI splitter or HDMI splitter with N interfaces, that meets the requirements of N displays working at the same time. 6.3 Scoring steps for observation evaluation Perform two evaluation scoring on the display. The content and methods of these two evaluations are the same. See Appendix B for the scoring table for each time; summarize the scoring according to Appendix C. The specific steps for scoring are as follows. 6.4 Scoring criteria 6.4.1 Criteria 1 (eliminate invalid scores for individual stage deviations) When an observer gives a score, which differs two or more grades, to the same image of the same display, under the same observation conditions, in the two test stages, the individual score is judged to be an invalid score for stage deviation. 6.4.2 Criteria 2 (eliminate invalid scores for individual extreme deviations) According to criteria 1, after removing the invalid score of the individual stage deviation, the highest score of the two totals of the single item AND the lowest score of the two totals of the single item, in the remaining scores, are judged as the invalid score of the extreme value deviation of this single item. 6.4.5 Criteria 5 (Determine the final total score) The final individual scores of all evaluation items of the evaluated display are summed, to obtain the final total score of the display. SJ/T 11590-2016 SJ ELECTRONIC INDUSTRY STANDARD ICS 31.120 L 63 Filing No.. A subjective method for the evaluation of the displaying quality of LED displays Issued on. JANUARY 15, 2016 Implemented on. JUNE 01, 2016 Issued by. Ministry of Industry and Information Technology of PRCTable of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Basic conditions and scoring criteria... 5 5 Testing and evaluation... 7 6 Evaluation procedures and guidelines... 13 Appendix A (Normative) List of formats of test file number... 15 Appendix B (Normative) Scoring table by times... 16 Appendix C (Normative) Summary of scores by observer... 19 Appendix D (Normative) Weight and score of evaluation item... 21ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that certain contents of this standard may involve patents. The issuing organization of this standard does not bear the responsibility for identifying these patents. This standard shall be under the jurisdiction of the Electronics Industry Standardization Research Institute of the Ministry of Industry and Information Technology. Drafting organizations of this standard. Shanghai Sansi Technology Development Co., Ltd., Xi'an Qingsong Technology Co., Ltd., Shenzhen Lianjian Optoelectronics Co., Ltd., Nanjing Luopu Co., Ltd. The main drafters of this standard. Cheng Deshi, Li Dahong, Xu Yongfu, Liu Hanping, Lan Lan. A subjective method for the evaluation of the displaying quality of LED displays1 ScopeThis standard specifies the subjective evaluation method for the displaying quality of LED displays. This standard applies to the subjective evaluation, of the displaying quality of indoor and outdoor full-color LHD displays, that are broadcast and controlled by a computer AND mainly display video images, animations, pictures. This standard does not apply to LED displays, that mainly display text information, such as variable information signs, urban traffic guidance signs, bank and securities market information.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 7401-1987 Method of subjective assessment of quality of color TV pictures SJ/T 11141-2012 Generic specification for LED panels SJ/T 11281-2007 Test methods of LED panels3 Terms and definitions3.1 Subjective evaluation A method, that directly uses the observer's subjective reaction to the image of the system under test, to determine the performance of the system under test. 3.2 Quality evaluation A subjective evaluation of the performance of the tested display system, under certain viewing conditions. 3.3 Test image An image or image sequence, which has specific requirements on the image material, AND is used for the subjective evaluation of the system under test. 3.4 Rating scale The scoring scale, which is used in subjective evaluation.4 Basic conditions and scoring criteria4.1 Basic observation conditions Unless otherwise specified, subjective evaluation shall be carried out under the conditions, which are specified in Table 1.When other observation conditions are required for individual specific evaluation items, they shall be explained separately in the evaluation items. 4.2 Test material A set of discs, which contain static images and moving images, of different resolutions. During evaluation, select the appropriate test image resolution, according to the resolution and aspect ratio of the display. 4.4 Scoring criteria It adopts a five-level subjective image quality evaluation method. Table 2 shows the corresponding relationship, between the subjective evaluation and the score.5 Testing and evaluation5.1 Definition of static image According to the resolution of the display under test, select a set of sharpness test card SD-01 and SD-02, which is suitable for its resolution AND can reflect the details of the image. 5.2 Definition of moving images According to the resolution of the tested display, select a group of dynamic definition test videos MD-01 ~ MD-02, that are suitable for its resolution AND can reflect the definition of the moving image. Observe from the front, on whether the license plate of the car, which is driving at high speed, is identifiable; whether the face of athletes, who is running, is clearly identifiable; whether there is obvious tailing phenomenon. 5.5 Assembly precision Under the condition that the 128-level full-white image test card (W-128) is displayed on the full screen, observe from the front and side, respectively, on whether there are bright lines, which are higher than normal brightness, OR dark lines, which are lower than normal brightness, at the joints of the module and cabinet. It will be evaluated, according to the quality degree. See Table 7, for the scoring of assembly precision. 5.7 Grayscale performance 2 (false contour phenomenon) According to the resolution of the display under test, display the "round moon" video test file MOON-01; the ambient brightness is the low value under the conditions of use. 5.8 Flyback line or stroboscopic phenomenon Select the horizontal bar test image (the bar height is greater than 64 pixels) HLINE-01, that can display non-grayscale (dark, low-bright, medium-bright, high-bright). The observer observes the display, by clicking teeth, shaking heads (nodding), blink, shaking the palm of hand, etc. 5.9 Virtual image phenomenon The test image DLINE-01 (low-density diagonal stripes), which shows the white diagonal stripes on a black background; the ambient brightness is the low value under the conditions of use; the observation distance is about 1000 times the pixel pitch. 5.10 Image stability On the test image DLINE-02 (high-density diagonal stripes), which shows white diagonal stripes on black background, observe whether the displayed image has unstable phenomena such as jitter, fluctuation, bounce, twitch. According to the degree of instability, make grading and scoring. See Table 12 for the scoring of image stability.6 Evaluation procedures and guidelines6.1 Test broadcast control device The standard output interface of the test broadcast control device is DVI or HDMI. If there are N displays, for comparison and evaluation, it must use a DVI splitter or HDMI splitter with N interfaces, that meets the requirements of N displays working at the same time. 6.3 Scoring steps for observation evaluation Perform two evaluation scoring on the display. The content and methods of these two evaluations are the same. See Appendix B for the scoring table for each time; summarize the scoring according to Appendix C. The specific steps for scoring are as follows. 6.4 Scoring criteria 6.4.1 Criteria 1 (eliminate invalid scores for individual stage deviations) When an observer gives a score, which differs two or more grades, to the same image of the same display, under the same observation conditions, in the two test stages, the individual score is judged to be an invalid score for stage deviation. 6.4.2 Criteria 2 (eliminate invalid scores for individual extreme deviations) According to criteria 1, after removing the invalid score of the individual stage deviation, the highest score of the two totals of the single item AND the lowest score of the two totals of the single item, in the remaining scores, are judged as the invalid score of the extreme value deviation of this single item. 6.4.5 Criteria 5 (Determine the final total score) The final individual scores of all evaluation items of the evaluated display are summed, to obtain the final total score of the display. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
