Compressed package includes: 1. The JPEG and DPCM algorithm article 2. To achieve its compression algorithm procedure 3. The image compression information. Readers please note: <1> discussed here is the gray image compression does not involve color images. <2> to achieve compression, the input image data using a custom format (com format), record the first four bytes of the image width and height, and then is gradually Line of image data, image mark the beginning and no end. This format of image data is obtained from the BMP image. <3> There are no procedures for JPEG decompression algorithm, compressed data stored as a standard JPEG file format, you can open in any view. DPCM method of solution Compressed program data is still stored as com format, you can watch it turn into a PGM format, compressed in the com format to PGM program. <4> All the C programs are in Linux (Rethat7.3) to complete.

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