OpenCv cvFindContours 查询轮廓并返回轮廓数量

 1 #include "cv.h"
 2 #include "highgui.h"
 3 #include <stdio.h>
 4 #include <math.h>
 5 #include <iostream>
 6 #include <ctime>
 7 using namespace cv;
 8 CvSeq *contourSeq = NULL;
 9 
10 IplImage* ImageThreshold(IplImage* src)
11 {
12     IplImage *gray,*binaryim;
13     int height,width;
14     gray=cvCreateImage(cvGetSize(src),src->depth,1);
15     cvCvtColor(src,gray,CV_BGR2GRAY);
16     height=gray->height;
17     width=gray->width;
18     printf("The canvas‘width is ：%d,  height is ：%d\n\n",width,height);
19 
20     binaryim=cvCreateImage(cvGetSize(src),IPL_DEPTH_8U,1);
21     cvThreshold(gray,binaryim,128,255,CV_THRESH_BINARY_INV);
22     return binaryim;
23 
24 }
25 
26 IplImage* printlunkuo(IplImage *binaryim)
27 {
28     CvMemStorage *contourStorage=cvCreateMemStorage();
29     cvFindContours(binaryim, contourStorage, &contourSeq, sizeof(CvContour),CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0)); 
30     
31     IplImage *pOutlineImage = cvCreateImage(cvGetSize(binaryim), IPL_DEPTH_8U, 3);    
32     int nLevels = 5;
33     cvRectangle(pOutlineImage,cvPoint(0,0),cvPoint(pOutlineImage->height,pOutlineImage->width),CV_RGB(0,0,0),CV_FILLED);
34     cvDrawContours(pOutlineImage, contourSeq, CV_RGB(255,0,0), CV_RGB(0,255,0), nLevels,0.5); 
35 
36     int contourcount=0;
37     for(;contourSeq!=0;contourSeq=contourSeq->h_next)
38     {
39         contourcount++;
40     }
41     printf("contour count is %d",contourcount);
42 
43 
44     
45     return pOutlineImage;
46     
47 
48 
49 }
50 
51 
52 int main(int argc,char** argv)
53 {
54     IplImage *src,*binaryim,*contourim;
55     src=cvLoadImage("gtest2.bmp",1);
56     binaryim=ImageThreshold(src);
57     contourim = printlunkuo(binaryim);
58     
59     
60     cvSaveImage("save.bmp", contourim);
61     
62     
63     
64     
65     
66     
67     
68     cvNamedWindow("Binary_image",0);    
69     cvShowImage("Binary_image",binaryim);
70     cvNamedWindow("Contour_image",0);    
71     cvShowImage("Contour_image",contourim);
72     cvWaitKey(0);
73 
74     cvDestroyWindow("Binary_image");
75     cvReleaseImage(&binaryim);
76     cvDestroyWindow("Contours_image");
77     cvReleaseImage(&contourim);
78 
79 
80 }