Recommendation ITU-T P.910 (11/2021) Subjective video quality assessment methods for multimedia applications Summary History FOREWORD Table of Contents 1 Scope 2 References 3 Definitions 3.1 Terms defined elsewhere 3.2 Terms defined in this Recommendation 4 Abbreviations and acronyms 5 Source signal 5.1 Recording environment 5.2 Recording system 5.2.1 Camera 5.2.2 Video signal and storage format 5.3 Scene characteristics 5.3.1 Spatial perceptual information measurement 5.3.2 Temporal perceptual information measurement 6 Test methods and experimental design 6.1 Absolute category rating 6.2 Absolute category rating with hidden reference 6.3 Degradation category rating 6.4 Pair comparison method 6.5 Comparison of the methods 6.6 Reference conditions 6.7 Experimental design 7 Evaluation procedures 7.1 Viewing conditions 7.2 Processing and playback system 7.3 Viewers 7.4 Instructions to viewers and training session 8 Statistical analysis and reporting of results Annex A Details related to the characterization of the test sequences A.1 Sobel filter A.2 How to use spatial information and temporal information for test sequence selection A.3 Examples Annex B Additional evaluative scales B.1 Rating scales B.2 Additional rating dimensions Annex C Simultaneous presentation of sequence pairs C.1 Introduction C.2 Synchronization C.3 Viewing conditions C.4 Presentations Annex D Video classes and their attributes Annex E An advanced data analysis technique for tests under challenging conditions Appendix I Test sequences Appendix II Instructions for viewing tests II.1 Absolute category rating and absolute category rating with hidden reference II.2 Degradation category rating II.3 Pair comparison Appendix III The simultaneous double stimulus for a continuous evaluation III.1 Test procedure III.2 The training phase III.3 Test protocol features III.4 Data processing III.5 Reliability of the subjects Appendix IV Object-based evaluation Appendix V An additional evaluative scale for degradation category rating Appendix VI Reference code for Annex E Bibliography <\pre>