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JppDemo.zip (82398, 2001-09-17)

/******************************************************************************** * Author: Dr. Tony Lin * * graduated from Peking University in 2001, *** * * Email: In china: tonylin0602@263.net; * * Foreign: tonylin0602@sina.com * * Release Date: 2001/9/14 * * * * Name: mini JPEG class, rewrite from IJG codes * * Source: IJG v.6a JPEG LIB * * Purpose 1. Readable, reusable * * 2. Customized Jpeg format, so compact * * 3. Standard c++ types, for easily understanding * * Acknowlegement: Thanks for great IJG, and Chris Losinger * * * * Legal Issues: (almost same as IJG with followings) * * * * 1. We don't promise that this software works. * * 2. You can use this software for whatever you want. * * You don't have to pay. * * 3. You may not pretend that you wrote this software. If you use it * * in a program, you must acknowledge somewhere. That is, please * * metion IJG, and Me, Dr. Tony Lin. * * * *********************************************************************************/ ///////////////////////////////////////////////////////////////////////////////// JppDemo platform: vc 6.0 Important files: MiniJpegEnc.h/cpp; MiniJpegDec.h/cpp; Dib.h/cpp JPP format: image width, 2 bytes; image height, 2 bytes; quality, 2 bytes; real huffman-encoded image data, left bytes. Compress key steps (with decompress in inverse order): (1) Color convertion and sub-sampling; (2) DCT: AA&N integer dct algorithm; (3) Quantization; (4) Huffman entropy encoding. Notice: We dont need any marker which started with 0xFF; So we can safely put only one byte with 0xFF if one huffman-encoder outputing byte is 0xFF.

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