ITU-R BT 815-1-1994 Specification of a signal for measurement of the contrast ratio of displays《显示对比度测试信号的规范》.pdf
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1、Rec. ITU-R BT.815-1 425 SPECIFICATION OF A SIGNAL FOR MEASUREMENT OF THE CONTRAST RATIO OF DISPLAYS (Question ITU-R 21 1/11) (1992-1994) The ITU Radiocommunication Assembly, considering that a reliable method to measure the contrast ratio of various displays is required; a) b) that the use of differ
2、ent signals can lead to different results; c) (APL) as close as possible to normal programme pictures, that the measurement of the contrast ratio should be carried out using a signal with an average picture level recommends 1. consistent measurement of contrast ratio. that the test signal and method
3、 of measurement shown in Annex 1 should be employed to facilitate the ANNEX 1 The test signai and method of measurement The test signal (see Fig. 1) consists of a peak white level patch surrounded by four black level patches, all set against a background of grey. The grey level of the waveform is at
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