The CCIR CONSIDERING (a) that Recommendation 500 specifies the method to be used for the subjective assessment of the quality of television pictures with a view to determining the relationship between that quality and the objective value of the specific distortion; (b) that Recommendation 567 describes the objective parameters of typical transmission impairment and the corresponding measurement methods and test signals; ？ that many experimental findings have been published concerning distortion to the composite signal in 525 and 625-line colour-television systems in NTSC, PAL and SECAM coding and that, despite considerable dispersion, those results can be used for determining an impairment characteristic which is representative of an average situation; (d) that it would be useful to have impairment characteristics which are accepted as reference values.
ITU-R BT.654 FRENCH-1986 history
1986ITU-R BT.654 FRENCH-1986 Subjective quality of television pictures in relation to the main impairments of the analogue composite television signal