An image data coding and/or decoding system according to the present invention has an input terminal for inputting an image data signal, a screen-area determining section for determining the area of the produced screen by analyzing the image data signal, a code amount assigning section for assignment...http://www.google.com.hk/patents/US6339657?utm_source=gb-gplus-share專利 US6339657 - Image compression of a facial region by adaptive quantization based on resolution
