公开(公告)号：US20020114529A1

公开(公告)日：2002-08-22

申请号：US10046764

申请日：2002-01-17

Applicant: MATSUSHITA GRAPHIC COMMUNICATION SYSTEMS, INC.

Inventor： Hitoshi Horie

IPC: G06K009/36

CPC classification number: H04N19/60 ,  H03M7/4006

Abstract: An arithmetic coding apparatus for carrying out complete pipeline processing is provided. This arithmetic coding apparatus analyzes an input image, reads image information accurately and performs arithmetic coding at ultra-high speed. Using a future prediction type Qe memory removes disturbance in the pipeline caused by renormalization. The arithmetic coding apparatus also generates a common context when coding multi-valued images without distinguishing between an AC component and DC component of a DCT coefficient. The apparatus is also provided with a circuit for outputting an arithmetic code which is a variable-length code with the length fixed to facilitate editing of a reconstructed image.

Abstract translation: 提供一种用于执行完整流水线处理的算术编码装置。 该算术编码装置分析输入图像，精确地读取图像信息，并以超高速进行算术编码。 使用未来的预测类型Qe记忆可以消除由重归一化引起的管道中的干扰。 当对多值图像进行编码而不区分DCT系数的AC分量和DC分量时，算术编码装置也产生公共上下文。 该装置还设置有用于输出算术代码的电路，该算术代码是具有固定长度的可变长度代码，以便于编辑重建图像。

公开(公告)号：US20020114527A1

公开(公告)日：2002-08-22

申请号：US10046827

申请日：2002-01-17

Applicant: MATSUSHITA GRAPHIC COMMUNICATION SYSTEMS, INC

Inventor： Hitoshi Horie

IPC: G06K009/36

CPC classification number: H04N1/41 ,  H03M7/4006 ,  H04N19/12 ,  H04N19/126 ,  H04N19/134 ,  H04N19/14 ,  H04N19/174 ,  H04N19/176 ,  H04N19/46 ,  H04N19/60

Abstract: The present invention provides an image coding method that efficiently compresses an image read through an optical system and significantly improves the quality of reproduced images. Image area separation section 2001 carries out image area decision in tile (macro block) units to separate the image into photographic image tiles and character image tiles. Then, layer separation section 2003 performs layer separation pixel by pixel to separate each pixel into pixels belonging to a background and pixels belonging to a foreground. Approximation processors 2008 and 2009 alleviate an increase of entropy due to layer separation through approximation processing and carry out JPEG-like processing on photographic images. The images are then subjected to coding with variable-length codes such as arithmetic codes. The coding rate is subjected to feedback control as appropriate taking into account the performance of the apparatus.

Abstract translation: 本发明提供一种图像编码方法，其有效地压缩通过光学系统读取的图像，并显着提高再现图像的质量。 图像区域分离单元2001执行图像区域决定（宏块）单元，以将图像分离成摄影图像块和角色图像块。 然后，层分离部2003逐像素地进行层分离，将各像素分割为属于背景的像素和属于前景的像素。 近似处理器2008年和2009年通过近似处理减轻了由于层分离引起的熵增加，并对摄影图像执行类似JPEG的处理。 然后将图像用诸如算术码的可变长度代码进行编码。 考虑到设备的性能，对编码率进行适当的反馈控制。