1、 Rec. ITU-R BT.1201-1 1 RECOMMENDATION ITU-R BT.1201-1 Extremely high resolution imagery (Question ITU-R 40/6) (1995-2004) The ITU Radiocommunication Assembly, considering a) that extremely high resolution imagery (EHRI) could be used as future imaging systems in various fields, such as computer gra
2、phics, printing, medical, industrial, educational, and television for image capture, processing, distribution, satellite and terrestrial broadcasting, and so on; b) that for constructing such systems, it is necessary to consult with many experts in various related fields; c) that studies and applica
3、tion experiments on EHRI are being conducted in various parts of the world; d) that common usage of devices is preferable for economical implementation of the EHRI; e) that bit-rate reduction technologies take a major role in transmission of the EHRI; f) that required spatial and temporal resolution
4、s and aspect ratios might differ depending on the applications in the market place; g) that conversion of spatial and temporal sampling lattices are becoming possible between different formats without introducing artifacts to the converted images, recommends 1 that common usage of technology and dev
5、ices among different television applications in EHRI should be facilitated in order to maximize both the use of limited resources and the benefit to those applications; 2 that pixel aspect ratio of electronic picture acquisition devices and picture display devices should be square. Television system
6、 image spatial resolution of the electronic devices for acquisition and display should be related to 1 920 pixels in the horizontal and 1 080 pixels in the vertical directions based on Recommendation ITU-R BT.709 by simple integer ratios; 3 that the sampling structure should be harmonized with the c
7、onstraints of existing video compression standards; 4 that a television colorimetry schema should be used that adopts reference colorimetry values as specified in Recommendation ITU-R BT.1361, but allows other interoperable colorimetry values to be applied should a particular application require; 5 that a television contrast gradient (“gamma”) schema should be used that adopts reference contrast gradient values as specified in Recommendation ITU-R BT.1361, but allows other interoperable contrast gradient values to be applied should a particular application require.
