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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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    copied!<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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