ITU-R BT 811-1-1994 Subjective Assessment of Enhanced PAL and SECAM Systems《增强型PAL和SECAM系统的主观评定》.pdf
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1、Rec. ITU-R BT.811-1 1RECOMMENDATION ITU-R BT.811-1THE SUBJECTIVE ASSESSMENT OF ENHANCED PALAND SECAM SYSTEMS(Question ITU-R 211/11)(1992-1994)Rec. ITU-R BT.811-1The ITU Radiocommunication Assembly,consideringa) that many proposals for improving the quality of PAL and SECAM systems are under discussi
2、on, some ofwhich concern only the receiver (e.g. doubling of the frame-rate) while others involve a considerable change of theemission system;b) that for enhanced PAL and SECAM emission formats, separate evaluations will be necessary for the enhancedpicture and for the compatible picture;c) that the
3、re will be a need to evaluate, for both the enhanced and compatible picture, the following: basic picture quality; failure characteristics; echo behaviour; and susceptibility to interference,recommends1. that for the evaluation of basic picture quality for enhanced PAL and SECAM emission systems, th
4、e double-stimulus continuous quality-scale method is recommended for both kinds of assessments (enhanced and compatiblepictures) (see Recommendation ITU-R BT.500).As a reference it is recommended to use: a 4:2:2 picture with an aspect ratio of 16:9 for the enhanced picture; a full-screen PAL or SECA
5、M picture for the compatible picture, if necessary produced by a pan-and-scantechnique.Test sequences should be critical but not unduly so with respect to the intended enhancements and possibledegradations mentioned above. The increasing use of computer graphics and video effects should also be take
6、n intoconsideration. Some sequences should include fine detailed structures and edges, which could cause cross effects inthe PAL or SECAM formats. Still and moving picture sequences are required;2. that for the evaluation of failure characteristics, echo behaviour and interference behaviour, the dou
7、ble-stimulus impairment scale method (Recommendation ITU-R BT.500) should be used for the tests of the enhanced andthe compatible picture. It is recommended to use the source references as in 1 above;3. that, for subjective assessments, the general viewing conditions be as given in Recommendation IT
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