DCT离散余弦变换C版本

Calcular

于 2015-07-08 16:16:01 发布

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CC 4.0 BY-SA版权

文章标签： DCT

本文链接：https://blog.youkuaiyun.com/Calcular/article/details/46804829

本文介绍了一种使用C语言实现DCT（离散余弦变换）的方法，包括初始化变换矩阵、进行DCT变换和IDCT逆变换的函数。通过示例展示了DCT和IDCT对图像矩阵的操作过程。

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#include<iostream>
#include<math.h>
using namespace std;
#define PI 3.14159265354

#define DCT_SIZE 8

float DCT_Mat[DCT_SIZE][DCT_SIZE];
float DctMap[DCT_SIZE][DCT_SIZE]=
{
    130,130,130,129,134,133,129,130,
    130,130,130,129,134,133,130,130,
    130,130,130,129,132,132,130,130,
    129,130,130,129,130,130,129,129,
    127,128,127,129,131,129,131,130,
    127,128,127,128,127,128,132,132,
    125,126,129,129,127,129,133,132,
    127,125,128,128,126,130,131,131
};
   //需要DCT处理的图像输入口

/*float DctMap[DCT_SIZE][DCT_SIZE]=
{
    0,0,0,0,
    0,1,1,0,
    0,1,1,0,
    0,0,0,0
};*/

float DctMapTmp[DCT_SIZE][DCT_SIZE];

void InitDctMat()
{
    int i,j,t;
    for(i=0;i<DCT_SIZE;i++) DCT_Mat[0][i]=sqrt(2.0/DCT_SIZE)*sqrt(1.0/2);
    for(i=1;i<DCT_SIZE;i++)
    {
        t=0;
        for(j=0;j<DCT_SIZE;j++)
        {
            DCT_Mat[i][j]=sqrt(2.0/DCT_SIZE)*cos(PI/(2.0*DCT_SIZE)*(i+t));t+=2*i;
        }
    }
}

void DCT()
{