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重要函数.txt
Package: jpegcompression.rar [view]
Upload User: yxlamp
Upload Date: 2021-05-06
Package Size: 2833k
Code Size: 0k
Category:
Compress-Decompress algrithms
Development Platform:
Visual C++
- jpeg_write_scanlines //编码正式开始
- pre_process_data //rgb->ycc
- compress_data //读入16行后开始进行dct、量化、编码的过程
- forward_DCT //准备进行dct变化,每次做两个8*8矩阵并对其进行量化
- 过程:对第一个分量的两个8*8矩阵做dct变化(每个矩阵做完dct均直接量化),对第二第三个分量只做一个8*8矩阵dct变化(忽略一个)。对以上不走重复一次,即每做4个一分量矩阵dct变化之后开始编码。即每次编码为16*16的矩阵