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POHow to find convexity defects using opencv?
 

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  1. POHow to find convexity defects using opencv?
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    <p>I have the following code</p> <pre><code> #include"opencv2/opencv.hpp" #include&lt;iostream&gt; #include&lt;math.h&gt; using namespace std; using namespace cv; main() { Mat img1,img2,sub,gray1,gray2,lab,ycbcr; int v[3]; int row,col,i,j,t; VideoCapture cap(0); namedWindow("current"); cap&gt;&gt;img1; sub=img1; row=img1.rows; col=img1.cols; cvtColor(img1,gray1,CV_BGR2GRAY); vector&lt;vector&lt;Point&gt; &gt; cont; vector&lt;Vec4i&gt; hierarchy; while (1) { cap&gt;&gt;img2; cvtColor(img2,gray2,CV_BGR2GRAY); for(i=0;i&lt;row;++i) { for (j=0; j&lt;col; ++j) { if(abs(gray1.at&lt;uchar&gt;(i,j) - gray2.at&lt;uchar&gt;(i,j))&gt;10) { sub.at&lt;Vec3b&gt;(i,j)[0] = img2.at&lt;Vec3b&gt;(i,j)[0]; sub.at&lt;Vec3b&gt;(i,j)[1] = img2.at&lt;Vec3b&gt;(i,j)[1]; sub.at&lt;Vec3b&gt;(i,j)[2] = img2.at&lt;Vec3b&gt;(i,j)[2]; } else { sub.at&lt;Vec3b&gt;(i,j)[0]=0; sub.at&lt;Vec3b&gt;(i,j)[1]=0; sub.at&lt;Vec3b&gt;(i,j)[2]=0; } } } cvtColor(sub,ycbcr,CV_BGR2YCrCb); inRange(ycbcr,Scalar(7,133,106),Scalar(255,178,129),ycbcr); findContours(ycbcr,cont,hierarchy,CV_RETR_LIST,CV_CHAIN_APPROX_SIMPLE); Scalar color = CV_RGB(255,255,255); vector&lt;vector&lt;Point&gt; &gt; hullPoints(cont.size()); for( i = 0; i &lt; cont.size(); i++ ) convexHull(cont[i],hullPoints[i],false); for(i = 0 ;i &gt;= 0; i = hierarchy[i][0] ) { drawContours( ycbcr, cont, i, color,1, CV_AA, hierarchy );//for drawing contours drawContours( ycbcr, hullPoints, i, color,2, CV_AA, hierarchy );//for drawing convex hull } flip(ycbcr,ycbcr,1); imshow("current",ycbcr); if(waitKey(33)=='q') break; img1=img2.clone(); } } </code></pre> <p>How to find the convexity defects in this convexHull..cvConvexityDefects() require const cvArr * as arguments.But i have vector point type result from convexHull..So how to type cast ..?</p>
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    1. USJinu Joseph Daniel
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      1. POHow to find convexity defects using opencv?
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    1. COHave a look at [this question](http://stackoverflow.com/questions/6806637/convexity-defects-c-opencv)
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      1. POHow to find convexity defects using opencv?
      1. USmathematical.coffee
    2. COWhat version of OpenCV you are using? AFAIK cvConvexHull function is legacy, and in new versions you should use cvConvexHull2. Also OpenCV have CvPoint, CvMat and CvSequense types - why not to use them, instead of merging std and opencv types?
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      1. POHow to find convexity defects using opencv?
      1. USMikhail Churbanov
    3. COI 'm using openCV 2.3
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      1. USJinu Joseph Daniel
 

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