学习Opencv4.doc

4.3 #include cv.h #include highgui.h #include stdio.h CvRect g_rect; bool g_isdown; void my_callback(int event, int x, int y, int flags, void* param); //将image图像的rect区域部分做加亮处理 void high_light(IplImage *image,CvRect rect); //对选中的部分绘制直方图 void Draw_hist(IplImage* img,CvRect Rect); int main() { IplImage *orginal_image=cvLoadImage(fruits.jpg); assert(orginal_image!=NULL); IplImage *temp_image=cvCreateImage(cvGetSize(orginal_image), orginal_image-depth, orginal_image-nChannels); assert(temp_image!=NULL); cvNamedWindow(Show); cvSetMouseCallback(Show,my_callback,(void*)temp_image); while (1) {IplImage *temp_image= cvCloneImage(orginal_image); if (true==g_isdown) { high_light(temp_image,g_rect); Draw_hist(temp_image,g_rect); } else { high_light(temp_image,g_rect); Draw_hist(temp_image,g_rect); } cvShowImage(Show,temp_image); if (27==cvWaitKey(30)) { break; } } cvDestroyAllWindows(); return 0; } void my_callback(int event, int x, int y, int flags, void* param) { IplImage *image=(IplImage*)(param); switch (event) { case CV_EVENT_LBUTTONDOWN :{ g_isdown=true; g_rect=cvRect(x,y,0,0); } break; case CV_EVENT_MOUSEMOVE:{ if (true==g_isdown) { g_rect.width=x-g_rect.x; g_rect.height=y-g_rect.y; } } break; case CV_EVENT_LBUTTONUP :{ g_isdown=false; if (g_rect.width0) { g_rect.x=g_rect.x+g_rect.width; g_rect.width*=-1; } if (g_rect.height0) { g_rect.y=g_rect.y+g_rect.height; g_rect.height*=-1; } high_light(image,g_rect); Draw_hist(image,g_rect); } break; } } //将图像进行加亮处理 void high_light(IplImage *image,CvRect rect) { assert(image!=NULL); int row,col; for (row=rect.y;rowrect.y+rect.height;row++) { uchar *ptr=(uchar*)(image-imageData+row*image-widthStep); for (col=rect.x;colrect.x+