The techniques of image tracing, encoding and spread and contract are used to extract the essential picture feature for recognition.
文中还应用了图象跟踪、编码及扩展和收缩等技术，抽取出识别所必需的图象特征。
The optical methods of pseudocolor encoding of black and white picture based on density encoding some colour have been presented, but all methods required encoding process.
将黑白图象用光学手段按其密度编成各种颜色的方法，已有些报道，但均需编码过程。
Don't let the picture color reduction two GIF or JPEG encoding.
不要让图片进行两次GIF减色或JPEG编码处理。
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