Method and apparatus for encoding and decoding data
    1.
    发明授权
    Method and apparatus for encoding and decoding data 失效
    用于对数据进行编码和解码的方法和装置

    公开(公告)号:US5717394A

    公开(公告)日:1998-02-10

    申请号:US768237

    申请日:1996-12-17

    摘要: A method and apparatus for decompressing and compressing data is described. The present invention provides an encoder for use in a compression system having a decoder for decoding information generated by the encoder. The encoder of the present invention includes a coder for producing codeword information in response to data. The encoder also includes a reorder unit that generates a coded data stream in response to the codeword information from the coder. The reorder unit comprises a run count reorder unit for arranging codewords into a decoding order and a bit pack unit to combine variable length codewords into fixed length interleaved words and to output the fixed length interleaved words in an order required by the decoder.

    摘要翻译: 描述了用于解压缩和压缩数据的方法和装置。 本发明提供一种用于具有解码器的压缩系统中的编码器,用于解码由编码器产生的信息。 本发明的编码器包括用于响应于数据产生码字信息的编码器。 编码器还包括重排序单元,其响应于来自编码器的码字信息产生编码数据流。 重排单元包括用于将码字排列成解码顺序的运行计数重排序单元和用于将可变长度码字组合成固定长度交织字的位组单元,并以解码器所要求的顺序输出固定长度交错字。

    JPEG 2000-like access using the JPM compound document file format
    2.
    发明授权
    JPEG 2000-like access using the JPM compound document file format 有权
    JPEG 2000型访问使用JPM复合文档格式

    公开(公告)号:US07477793B1

    公开(公告)日:2009-01-13

    申请号:US10404507

    申请日:2003-03-31

    IPC分类号: G06K9/36

    摘要: Compound document images are usually high resolution and high quality images that include color, graphics, and images in addition to text. The need for good compression is important for storage and transmission. Due to the large size, even compressed, it is often difficult to access document images quickly and efficiently for display on monitors. The nascent JPM file format enables the best compound document image compression in terms of rate-distortion. However, the access into a JPM file is limited by the access features of the coders used. JPEG 2000 is an image coding system that allows access to lower resolutions, progressive bit-rates, and regions of interest.

    摘要翻译: 复合文档图像通常是高分辨率和高质量图像,包括除了文本之外的颜色,图形和图像。 需要良好的压缩对于存储和传输很重要。 由于大尺寸,甚至压缩,通常难以快速有效地访问文档图像以在显示器上显示。 新兴的JPM文件格式使得能够在速率失真方面实现最佳的复合文档图像压缩。 然而,访问JPM文件受到所使用的编码器的访问特征的限制。 JPEG 2000是允许访问较低分辨率,逐行比特率和感兴趣区域的图像编码系统。