// 第五题#include 
     
      #include 
      
       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 
     
      #include 
      
       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 
     
      #include 
      
       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;}