学步园

首先，不知道这篇博文的标题合不合适，呵呵，大家有没有更合适的标题呢。

这篇博文是在前两篇的基础上写的，大家可以参看一下。下面贴代码了。

#include <cv.h><br /> #include <highgui.h><br /> #include <stdio.h><br /> #pragma comment( lib, "cv.lib" )<br /> #pragma comment( lib, "cxcore.lib" )<br /> #pragma comment( lib, "highgui.lib" )<br /> IplImage* org = 0;<br /> IplImage* img = 0;<br /> IplImage* tmp = 0;<br /> IplImage* msk = 0;<br /> IplImage* dst = 0 ;<br /> void on_mouse( int event, int x, int y, int flags, void* ustc)<br /> {<br /> static CvPoint pre_pt = {-1,-1};<br /> static CvPoint cur_pt = {-1,-1};<br /> CvFont font;<br /> cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);<br /> char temp[16];</p> <p> if( event == CV_EVENT_LBUTTONDOWN )<br /> {<br /> cvCopy(org,img);<br /> sprintf(temp,"(%d,%d)",x,y);<br /> pre_pt = cvPoint(x,y);<br /> cvPutText(img,temp, pre_pt, &font, cvScalar(0,0, 0, 255));<br /> cvCircle( img, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );<br /> cvShowImage( "image", img );</p> <p> cvCopy(img,tmp);<br /> }<br /> else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))<br /> {<br /> cvCopy(tmp,img);<br /> sprintf(temp,"(%d,%d)",x,y);<br /> cur_pt = cvPoint(x,y);<br /> cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255));<br /> cvLine(img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 );<br /> cvShowImage( "image", img );<br /> }<br /> else if( event == CV_EVENT_LBUTTONUP )<br /> {<br /> sprintf(temp,"(%d,%d)",x,y);<br /> cur_pt = cvPoint(x,y);<br /> cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255));<br /> cvCircle( img, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );<br /> cvLine( img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, CV_AA, 0 );<br /> cvSetZero(msk);<br /> cvLine( msk, pre_pt, cur_pt, cvScalar(255,255,255,0), 1, CV_AA, 0 );<br /> cvShowImage( "image", img );<br /> int width=org->width;<br /> int height=org->height;<br /> int step=org->widthStep;<br /> uchar *data=(uchar*)org->imageData;<br /> int mask_step=msk->widthStep;<br /> uchar *mask_data=(uchar*)msk->imageData;<br /> cvSet(dst,cvScalar(255,255,255));<br /> 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)));<br /> double bin_width=(double)dst->width/length;<br /> double bin_height=(double)dst->height/255;<br /> int count=0;<br /> for(int i=0;i<width;i++)<br /> {<br /> for(int j=0;j<height;j++)<br /> {<br /> if(mask_data[j*mask_step+i]!=0)<br /> {<br /> CvPoint pt;<br /> pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3+2])*bin_height);<br /> cvCircle(dst, pt,1,cvScalar(0,0,255,0) ,CV_FILLED, CV_AA, 0 );<br /> pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3+1])*bin_height);<br /> cvCircle(dst, pt,1,cvScalar(0,255,0,0) ,CV_FILLED, CV_AA, 0 );<br /> pt=cvPoint(bin_width*count,(dst->height-data[j*step+i*3])*bin_height);<br /> cvCircle(dst, pt,1,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );<br /> count++;<br /> }<br /> }<br /> }</p> <p> cvNamedWindow("dst",1);<br /> cvShowImage("dst",dst);<br /> }<br /> }<br /> int main()<br /> {<br /> org=cvLoadImage("lena.jpg",1);<br /> img=cvCloneImage(org);<br /> tmp=cvCloneImage(org);<br /> msk=cvCreateImage(cvSize(img->width,img->height),8,1);<br /> cvSetZero(msk);<br /> dst=cvCreateImage(cvSize(400,300),8,3);<br /> cvSet(dst,cvScalar(255,255,255));<br /> cvNamedWindow("image",1);<br /> cvSetMouseCallback( "image", on_mouse, 0 );<br /> cvShowImage("image",img);<br /> cvWaitKey(0);<br /> cvDestroyAllWindows();<br /> cvReleaseImage(&org);<br /> cvReleaseImage(&img);<br /> cvReleaseImage(&tmp);<br /> cvReleaseImage(&msk);<br /> cvReleaseImage(&dst);<br /> return 0;<br /> }

效果图如下，上图是绘线窗口，下图是线上的RGB强度分布图。

这里离散的显示分布图，大家有没有方法使连续起来呢？