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Image compression method and apparatus, and image coding method and apparatus

  • US 20030198381A1
  • Filed: 04/17/2003
  • Published: 10/23/2003
  • Est. Priority Date: 04/17/2002
  • Status: Active Grant
First Claim
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1. An image compression method of compressing a color image, comprising:

  • an index conversion step of converting each pixel of the color image into an index assigned in correspondence with a color value and generating color information containing the number of pixels for each indexed color and an index image obtained by converting each of the pixels into an index;

    a background determination step of determining a color value corresponding to a predetermined index in the index image as a background color of the color image;

    an order determination step of determining, on the basis of the color information and the background color, an order in which the color image is compressed for each index;

    a binary image generating step of generating a binary image for each index from the index image;

    a compression step of compressing the binary image according to the order; and

    a generating step of generating compressed image data by integrating background data containing a size of the color image and a color value of the background color and compressed data of the binary image for each of the indexes.

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