A technique is disclosed for reducing the bit rate of a bit stream coded into a compressed form according to the MPEG-2 standard, without causing significant degradation in image quality of a decoded image. An inverse DCT converter dequantizes a MPEG-2 bit stream and outputs resultant discrete cosine...http://www.google.com.tw/patents/US6658157?utm_source=gb-gplus-share專利 US6658157 - Method and apparatus for converting image information
