OpenCV第三章练习5-7

// 第五题
#include <opencv/cv.h>
#include <opencv/highgui.h>

int main(int argc, char **argv)
{
    int i,j;
    IplImage *img = cvCreateImage(cvSize(210,210), 8, 1);
    cvSetZero(img);

    for(i = 0;i<10; i++)
    {
        cvSetImageROI(img, cvRect(i*10, i*10, img->width-2*i*10, img->height-2*i*10));
        cvSet(img,cvScalar(i*20),NULL);
    }

    cvResetImageROI(img);
    cvNamedWindow("example_p104_5", 1);
    cvShowImage("example_p104_5", img);

    cvWaitKey(0);

    cvReleaseImage(&img);
    cvDestroyWindow("example_p104_5");
}

// 第六题
#include <opencv/cv.h>
#include <opencv/highgui.h>

int main(int argc, char *argv[])
{
    IplImage *img, *img1, *img2;
    char src[] = "F:\\test\\p104_6\\p104_6\\lena.jpg";

    img = cvLoadImage(src,1);
    if( img == NULL )
　　　　return 1;
　　
    img1 = cvCreateImageHeader(cvSize(20,30),img->depth,img->nChannels);
    img1->origin = img->origin;
    img1->widthStep = img->widthStep;
    img1->imageData = (char *)cvPtr2D(img,5,10,NULL);
    cvNot(img1,img1);

    img2 = cvCreateImageHeader(cvSize(20,30),img->depth,img->nChannels);
    img2->origin = img->origin;
    img2->widthStep = img->widthStep;
    img2->imageData = (char *)cvPtr2D(img,50,60,NULL);
    cvNot(img2,img2);

    cvNamedWindow("p104_6",CV_WINDOW_AUTOSIZE);
    cvShowImage("p104_6",img);
    cvWaitKey(0);

    cvReleaseImage(&img);
    cvReleaseImage(&img1);
    cvReleaseImage(&img2);
    cvDestroyWindow("p104_6");
}

。。。啊，我加载的图片太大了，结果的小方块太小了。。。

// 第七题
#include <opencv/cv.h>
#include <opencv/highgui.h>

int main(int argc, char *argv[])
{
    IplImage *img, *red, *green, *blue;
    char src[] = "F:\\test\\p104_7\\p104_7\\fruits.jpg";

    img =cvLoadImage(src,1);
　　 if( img == NULL)
　　　　return 1;

    red = cvCreateImage(cvSize(img->width, img->height), img->depth, 1);
    green = cvCreateImage(cvSize(img->width, img->height), img->depth, 1);
    blue = cvCreateImage(cvSize(img->width, img->height), img->depth, 1);

    cvSplit(img, red, green, blue, NULL);
    cvZero(img);
    cvMerge(NULL, green, NULL, NULL, img);
    cvNamedWindow("p104_7", 1);
    cvShowImage("p104_7", img);
    cvWaitKey(0);

    IplImage *clone1 = cvCreateImage(cvGetSize(green), green->depth, green->nChannels);
    IplImage *clone2 = cvCreateImage(cvGetSize(green), green->depth, green->nChannels);
    cvCopy(green, clone1, NULL);
    cvCopy(green, clone2, NULL);
//    IplImage *clone1 = (IplImage *)cvClone(green);
//    IplImage *clone2 = (IplImage *)cvClone(green);
    double min_val = 0.0, max_val = 0.0;
    cvMinMaxLoc(green, &min_val, &max_val, NULL, NULL, NULL);
    unsigned char thresh = (unsigned char)((max_val-min_val)/2.0);
    cvSet(clone1, cvScalar(thresh), NULL);
    cvSetZero(clone2);
    cvCmp(green, clone1, clone2, CV_CMP_GE);
    cvSubS(green, cvScalar(thresh/2), green, clone2);
    cvShowImage("p104_7", green);
    cvWaitKey(0);

    cvReleaseImage(&img);
    cvReleaseImage(&red);
    cvReleaseImage(&green);
    cvReleaseImage(&blue);
    cvDestroyWindow("p104_7");
    return 0;
}