生活随笔
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鼠标马赛克图像部分区域
小编觉得挺不错的,现在分享给大家,帮大家做个参考.
这是一个简单的马赛克程序，利用选定矩形区域的平均值代替该区域各点的像素值。大家有没有更好的方法马赛克呢？
[c-sharp] view plaincopy
#include <cv.h> #include <highgui.h> #pragma comment( lib, "cv.lib" ) #pragma comment( lib, "cxcore.lib" ) #pragma comment( lib, "highgui.lib" ) IplImage* org = 0; IplImage* img = 0; IplImage* tmp = 0; IplImage* dst = 0; int foo=6; void on_mouse( int event, int x, int y, int flags, void* ustc) { CvPoint p0; CvPoint p1; if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON)) { img=cvCloneImage(tmp); cvResetImageROI(img); if(x<foo) { if(y<foo) { p0=cvPoint(0,0); p1=cvPoint(2*foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(0,img->height-2*foo); p1=cvPoint(2*foo,img->height); } else { p0=cvPoint(0,y-foo); p1=cvPoint(2*foo,y+foo); } } else if(x>img->width-foo) { if(y<foo) { p0=cvPoint(img->width-2*foo,0); p1=cvPoint(img->width,2*foo); } else if(y>img->height-foo) { p0=cvPoint(img->width-2*foo,img->height-2*foo); p1=cvPoint(img->width,img->height); } else { p0=cvPoint(img->width-2*foo,y-foo); p1=cvPoint(img->width,y+foo); } } else { if(y<foo) { p0=cvPoint(x-foo,0); p1=cvPoint(x+foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(x-foo,img->height-2*foo); p1=cvPoint(x+foo,img->height); } else { p0=cvPoint(x-foo,y-foo); p1=cvPoint(x+foo,y+foo); } } cvRectangle(img,p0,p1,CV_RGB(0,255,0)); cvShowImage( "img", img ); } else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON)) { if(x<foo) { if(y<foo) { p0=cvPoint(0,0); p1=cvPoint(2*foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(0,img->height-2*foo); p1=cvPoint(2*foo,img->height); } else { p0=cvPoint(0,y-foo); p1=cvPoint(2*foo,y+foo); } } else if(x>img->width-foo) { if(y<foo) { p0=cvPoint(img->width-2*foo,0); p1=cvPoint(img->width,2*foo); } else if(y>img->height-foo) { p0=cvPoint(img->width-2*foo,img->height-2*foo); p1=cvPoint(img->width,img->height); } else { p0=cvPoint(img->width-2*foo,y-foo); p1=cvPoint(img->width,y+foo); } } else { if(y<foo) { p0=cvPoint(x-foo,0); p1=cvPoint(x+foo,2*foo); } else if(y>img->height-foo) { p0=cvPoint(x-foo,img->height-2*foo); p1=cvPoint(x+foo,img->height); } else { p0=cvPoint(x-foo,y-foo); p1=cvPoint(x+foo,y+foo); } } dst=cvCloneImage(tmp); cvSetImageROI(dst,cvRect(p0.x,p0.y,p1.x-p0.x,p1.y-p0.y)); CvScalar mean=cvAvg(dst); cvSet(dst,mean); cvResetImageROI(dst); tmp=cvCloneImage(dst); cvRectangle(dst,p0,p1,CV_RGB(0,255,0)); cvShowImage( "img", dst ); } } int main() { org=cvLoadImage("lena.jpg",1); img=cvCloneImage(org); tmp=cvCloneImage(org); dst=cvCloneImage(org); cvNamedWindow("img",1); cvSetMouseCallback( "img", on_mouse, 0 ); cvShowImage("img",img); cvWaitKey(0); cvDestroyAllWindows(); cvReleaseImage(&org); cvReleaseImage(&img); cvReleaseImage(&tmp); cvReleaseImage(&dst); return 0; }
效果图如下，这里马赛克了lena图的左眼。
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