《学习OpenCV》练习题第三章第二题

#include <highgui.h>
#include <cv.h>
#include <stdio.h>

#pragma comment (lib,"opencv_calib3d231d.lib")
#pragma comment (lib,"opencv_contrib231d.lib")
#pragma comment (lib,"opencv_core231d.lib")
#pragma comment (lib,"opencv_features2d231d.lib")
#pragma comment (lib,"opencv_flann231d.lib")
#pragma comment (lib,"opencv_gpu231d.lib")
#pragma comment (lib,"opencv_haartraining_engined.lib")
#pragma comment (lib,"opencv_highgui231d.lib")
#pragma comment (lib,"opencv_imgproc231d.lib")
#pragma comment (lib,"opencv_legacy231d.lib")
#pragma comment (lib,"opencv_ml231d.lib")
#pragma comment (lib,"opencv_objdetect231d.lib")
#pragma comment (lib,"opencv_ts231d.lib")
#pragma comment (lib,"opencv_video231d.lib")

#define ROWS 400
#define COLS 400

/*
 *《学习OpenCV》第三章第二题
 * 完成时间：0:22 3/2 星期六 2013
 */
int main()
{
    // 创造一个三通道二维矩阵，大小为ROWS*COLS
    CvMat* mat = cvCreateMat(ROWS, COLS, CV_8UC3);
    
    // 将所有数值初始化为零 
    for(int i = 0; i < mat->cols; i++)
    {
        for(int j = 0;j < mat->rows; j++)
        {
            cvSet2D(mat, i, j, cvScalarAll(0));
        }
    }

    // 画一个圆
    cvCircle(mat, cvPoint(ROWS/2, COLS/2), ROWS/4, cvScalar(255, 255, 0), 3, 8, 0);

    // 显示图像
    cvShowImage("img", mat);
    cvWaitKey(0);

    cvReleaseMat(&mat);
    cvDestroyAllWindows();

    return 0;
}

运行结果：