国际上已公认,由观看员对电视图象质量进行分等评定的主观评价方法,是研究电视系统中图象受损的物理量与图象质量的主观感觉之间关系的一种成功的方法。从三十年代开始这方面的研究工作以来,大量的实验和实际应用情况已充分证明,主观评价结果具有足够高的置信度。因此不仅在制定系 It is internationally recognized that the subjective assessment of ratings of television images by viewers is a successful approach to the study of the relationship between the physical quantities of image impairments and subjective perceptions of image quality in television systems. Since the beginning of the thirties research work in this area, a large number of experimental and practical applications have been fully proved that the subjective evaluation results with high enough confidence. So not only in the development of department