马赛克操作就是在指定大小的范围内，图像的颜色取成相同的。
int masaike(unsigned char *srcData, int width, int height, int stride, int mode)
{
//@ stride：每个马赛克块的大小
//@ mode: 未使用参数
int ret = 0;
int i, j, gray, offset;
//offset = stride - width * 3;//这个参数没有用到
//有些情况下会对图像的宽度保持为4的倍数之类的，这种情况下需要这个参数
//就是遍历像素的时候，每次换行时，指针跳过填充的部分
offset = 4 - (width * 3) % 4;
unsigned char* pSrc = srcData;
int R, G, B;
for (j = 0; j < height; j++)
{
for (i = 0; i < width; i++)
{
if (j%stride == 0)
{
if (i%stride == 0)
{
B = pSrc[0];
G = pSrc[1];
R = pSrc[2];
}
else
{
pSrc[0] = B;
pSrc[1] = G;
pSrc[2] = R;
}
}
else
{
unsigned char* tmp = pSrc - width*3;
pSrc[0] = tmp[0];
pSrc[1] = tmp[1];
pSrc[2] = tmp[2];
}
pSrc += 3;
}
//pSrc += offset;
}
return ret;
};int main()
{
Mat img_src = imread("darling.jpg", IMREAD_COLOR);
//namedWindow("img_src", CV_WINDOW_NORMAL);
imshow("img_src", img_src);
cout << img_src.step << endl;
unsigned char * data = (unsigned char*)malloc(sizeof(unsigned char) * img_src.cols * img_src.rows*img_src.channels());
memcpy(data, img_src.data, sizeof(unsigned char) * img_src.cols * img_src.rows*img_src.channels());
int flag = masaike(data, img_src.cols, img_src.rows, 8, 0);
Mat img_dst(img_src.rows, img_src.cols, CV_8UC3, data);
//namedWindow("img_dst", CV_WINDOW_NORMAL);
imshow("img_dst", img_dst);
waitKey();
return 0;
}
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