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    • 10. 发明申请
    • CONTEXT-BASED, ADAPTIVE, LOSSLESS IMAGE CODEC
    • 基于语境,自适应,无损图像编解码器
    • WO1996015620A1
    • 1996-05-23
    • PCT/CA1995000635
    • 1995-11-08
    • THE CHINESE UNIVERSITY OF HONG KONGWU, XiaolinMEMON, Nasir
    • THE CHINESE UNIVERSITY OF HONG KONG
    • H04N01/41
    • H04N1/41G06T9/004
    • An encoding/decoding method is provided for lossless (reversible) compression of digital pictures of all types, including continuous-tone images, graphics, multimedia images of mixed text, graphics and photographs, binary documents and drawings. Continuous-tone mode and binary mode are identified on a pixel-by-pixel basis (12). In continuous-tone mode, context modeling and prediction (20, 22, 26) are employed involving mostly integer arithmetic and simple logic in a conceptually sophisticated scheme. Both the encoding and decoding techniques are suitable for sequential and progressive transmission, although different specific algorithms may be employed for the different specific cases. The system is symmetric, meaning that the encoder and decoder have the same time and space complexities.
    • 提供了一种编码/解码方法,用于所有类型的数字图像的无损(可逆)压缩,包括连续色调图像,图形,混合文本的多媒体图像,图形和照片,二进制文件和图形。 逐像素地识别连续色调模式和二进制模式(12)。 在连续色调模式中,上下文建模和预测(20,22,26)在概念上复杂的方案中主要涉及整数运算和简单逻辑。 编码和解码技术都适用于顺序和逐行传输,尽管不同的具体算法可以用于不同的具体情况。 系统是对称的,这意味着编码器和解码器具有相同的时间和空间复杂性。