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综合高频编码的码率取决于图中有效边沿的含量。本文给出了四幅测试图片的边沿统计数据,介绍了利用视觉掩盖现象删除无关边沿的方法。从主观试验结果看,自然测试图片和RMA测试卡可以编成码率3.25～3.3bit/pel,而质量和8bit/pel PCM原图仿佛。因此,当要求电视信号能编成码率34Mbit/s时,综合高频是PAL电视亮度信号一种可能的编码方法。用于考核演播室设备质量的菲利浦分辨率测试卡,因为边沿含量高,按上述码率编码时不能获得满意的图象质量。
The rate of synthesis of high-frequency encoding depends on the content of the active edge in the picture. In this paper, the edge statistics of four test images are given, and the method of using visual mask to delete irrelevant edges is introduced. From the subjective test results, the natural test pictures and RMA test cards can be compiled into a bit rate of 3.25 ~ 3.3bit / pel, while the quality and 8bit / pel PCM original seems. Therefore, when the demand for television signals can be compiled into a code rate of 34Mbit / s, the integrated high frequency is one of the possible encoding methods for PAL TV luminance signals. The Philips resolution test card used to assess the quality of studio equipment can not achieve satisfactory picture quality at the above code rate because of high edge content.