《学习OpenCV》练习题第三章第五题

#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")

/*
 *《学习OpenCV》第三章第五题
 * 完成时间：2:49 3/2 星期六 2013
 */

// 图像高宽
#define IMG_SIZE   420

// 边界宽度
#define BORDER_WIDTH 10

int main()
{
    // 创建8位单通道图像
    IplImage * image = cvCreateImage(cvSize(IMG_SIZE, IMG_SIZE), 8, 1);

    // 初始化置零
    cvZero(image);
    
    // 灰度值
    int value = 0;
    // ROI区域大小
    int rect_size = IMG_SIZE;
    for(int length = IMG_SIZE; length >= 0 && value <= 200; length -= BORDER_WIDTH, value += 10)
    {
        cvSetImageROI(image, cvRect(IMG_SIZE - length, IMG_SIZE- length, rect_size, rect_size));

        rect_size -= 2 *BORDER_WIDTH;
        cvSet(image, cvScalarAll(value));
        cvResetImageROI(image);
    }

    cvNamedWindow("img", 1);
    cvShowImage("img", image);

    cvWaitKey(0);
    cvReleaseImage(&image);
    cvDestroyAllWindows();

    return 0;
}

运行结果：