#include <cv.h> #include <highgui.h> #include <stdio.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* msk = 0; IplImage* dst = 0 ; void on_mouse( int event, int x, int y, int flags, void* ustc) { static CvPoint pre_pt = {-1,-1}; static CvPoint cur_pt = {-1,-1}; CvFont font; cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA); char temp[16]; if( event == CV_EVENT_LBUTTONDOWN ) { cvCopy(org,img); sprintf(temp,"(%d,%d)",x,y); pre_pt = cvPoint(x,y); cvPutText(img,temp, pre_pt, &font, cvScalar(0,0, 0, 255)); cvCircle( img, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); cvShowImage( "image", img ); cvCopy(img,tmp); } else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON)) { cvCopy(tmp,img); sprintf(temp,"(%d,%d)",x,y); cur_pt = cvPoint(x,y); cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); cvLine(img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 ); cvShowImage( "image", img ); } else if( event == CV_EVENT_LBUTTONUP ) { sprintf(temp,"(%d,%d)",x,y); cur_pt = cvPoint(x,y); cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255)); cvCircle( img, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); cvLine( img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 ); cvSetZero(msk); cvLine( msk, pre_pt, cur_pt, cvScalar(255,255,255,0), 1, CV_AA, 0 ); cvShowImage( "image", img ); int width=org->width; int height=org->height; int step=org->widthStep; uchar *data=(uchar*)org->imageData; int mask_step=msk->widthStep; uchar *mask_data=(uchar*)msk->imageData; cvSet(dst,cvScalar(255,255,255)); int length=cvCeil(sqrt((pre_pt.x-cur_pt.x)*(pre_pt.x-cur_pt.x)+(pre_pt.y-cur_pt.y)*(pre_pt.y-cur_pt.y))); double bin_width=(double)dst->width/length; double bin_height=(double)dst->height/255; int count=0; for(int i=0;i<width;i++) { for(int j=0;j<height;j++) { if(mask_data[j*mask_step+i]!=0) { CvPoint pt; pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3+2])*bin_height); cvCircle(dst, pt,1,cvScalar(0,0,255,0) ,CV_FILLED, CV_AA, 0 ); pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3+1])*bin_height); cvCircle(dst, pt,1,cvScalar(0,255,0,0) ,CV_FILLED, CV_AA, 0 ); pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3])*bin_height); cvCircle(dst, pt,1,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 ); count++; } } } cvNamedWindow("dst",1); cvShowImage("dst",dst); } } int main() { org=cvLoadImage("lena.jpg",1); img=cvCloneImage(org); tmp=cvCloneImage(org); msk=cvCreateImage(cvSize(img->width,img->height),8,1); cvSetZero(msk); dst=cvCreateImage(cvSize(400,300),8,3); cvSet(dst,cvScalar(255,255,255)); cvNamedWindow("image",1); cvSetMouseCallback( "image", on_mouse, 0 ); cvShowImage("image",img); cvWaitKey(0); cvDestroyAllWindows(); cvReleaseImage(&org); cvReleaseImage(&img); cvReleaseImage(&tmp); cvReleaseImage(&msk); cvReleaseImage(&dst); return 0; }
效果图如下，上图是绘线窗口，下图是线上的RGB强度分布图。
