import{_ as e,c as a,a as t,o as s}from"./app-B5iJDTQ8.js";const p={};function o(c,n){return s(),a("div",null,n[0]||(n[0]=[t(`

JPEG算法解密(五)

最后,我提供给大家一个简易的jpeg压缩算法的代码,这份代码用C++编写,以开源方式提供,放在了github上,可以到下面这个网址下载
http://github.com/thejinchao/jpeg_encoder
使用方法很简单,像下面这样就可以了

#include "jpeg_encoder.h"
 
JpegEncoder encoder;
//输入的文件必须是24bit的bmp文件,尺寸必须是8的倍数
encoder.readFromBMP(inputFileName);
 
//第二个参数在1~199之间,代表文件压缩程度,数字越大,压缩后的文件体积越小
encoder.encodeToJPG(outputFileName, 50);

这份代码只是为了配合这个系列的文章,所以没有考虑优化,如果你想在实际工程中使用jpeg的压缩算法,还是使用被广泛应用的libjpeg或者OpenJpeg。


参考资料:
【1】http://www.impulseadventure.com/photo/jpeg-huffman-coding.html
【2】http://www.mysanco.cn/index.php?class=wenku&action=wenku_item&id=96
【3】http://www.codingnow.com/2000/download/jpeg.txt
【4】http://jingyan.baidu.com/article/cbf0e500f1ce562eaa2893f4.html
【5】http://www.codeproject.com/Articles/83225/A-Simple-JPEG-Encoder-in-C

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