1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.100-1999-MSW-E.DOC 22.10.03 15.07.10 QUESTION ITU-R 100/6 Television and multimedia images quality levels (1999) The ITU Radiocommunication Assembly considering a) that the development of broadcast, and non-broadcast, television systems
2、 is being widely undertaken, and, with their development, new levels of potential image quality are available; b) that with the development of new image transmission and presentation technologies in broadcast and non-broadcast television, television system parameters can be chosen on the basis of co
3、mpromises between image quality and the cost of image transmission and presentation; c) that for the definition of the requirements for television systems and their parts the potential level of image quality to be provided by these systems is an important element; d) that Recommendation ITU-R BT.112
4、7 proposes image quality levels for HDTV, EDTV, SDTV and LDTV for TV broadcasting services, and draft ITU-T Recommendation P.911 proposes image quality levels TV0-TV5, MM0-MM5 for multimedia communication applications, and it would be valuable to have a single unified classification of the image qua
5、lity levels for broadcast and non-broadcast television, transmitted in TV and multimedia environment; e) that in the MPEG-1, MPEG-2 and MPEG-4 specifications, methods of video compression providing any levels of image quality are available; f) that use of digital methods of image processing allows a
6、 flexible trade-off of image quality, bit rate and complexity of hardware and software; g) that new technologies make possible to build of a unified basis for the systems, providing different levels of quality of image transmission - from high resolution imagery to multimedia images transmitted, for
7、 example, as a sequence of still pictures, with near zero frame rate; h) that in future the designers and users of TV systems and TV equipment will be interested in the levels of quality, provided by TV systems under development and in operation, decides that the following Question should be studied
8、 1 How can television systems including image transmission in broadcasting environments be classified in a coherent, logical, and useful way based on picture quality? 2 How do image systems for HRI, HDTV, EDTV, EQTV, SDTV, LDTV and MM relate to each other, and within equipment development margins, t
9、o compressed bit rates? - 2 - 6/1-E C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.100-1999-MSW-E.DOC 22.10.03 15.07.10 3 Which guidelines can be given for coding algorithms, spatial format, delivered frame rate, delay variation, channel impairment for each level of quality? 4 Which
10、 levels of colour quality, analogue quality and digital quality are appropriate for each level of image quality? further decides 1 that the results of above studies should be addressed to: update existing Recommendation(s); prepare new Recommendation(s); 2 that the above studies should be completed
11、by 2005; 3 that Recommendation ITU-R BT.1127 can be used as a initial basis of this study. NOTE 1 This Question should be considered in conjunction with and in the light of Question ITU-R 99/6 “Relationship between quality, quality evaluation methodology and type of application, in a multimedia environment”. _
