IplImage和Mat访问图像中每个像素

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opencv1.0,IplImage类型存储图像数据，3通道

void print_img(IplImage* img){    int x,y;    FILE *file;    file = fopen("1.txt", "w");    uchar* data = (uchar *)img->imageData;    int step = img->widthStep / sizeof(uchar);    int channels = img->nChannels;    for (int i = 0; i<img->height; i++)        for (int j = 0; j<img->width; j++)        {            fprintf(file, "%d %d %d ", data[i*step + j*channels + 0], data[i*step + j*channels + 1], data[i*step + j*channels + 2]);        }    fclose(file);}

opencv2.4.9，Mat类型存储图像数据，3通道

void print_img(Mat img){    int x,y;    FILE *file;    file = fopen("1.txt", "w");    for (int x = 0; x<img.rows; x++)    {        for (int y = 0; y<img.cols; y++)        {            fprintf(file, "%d %d %d ", img.at<Vec3b>(x, y)[0], img.at<Vec3b>(x, y)[1], img.at<Vec3b>(x, y)[2]);        }    }}

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