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POFinding Points in Contours
 

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    <p>So here is the code that i used to detect the <b>contours</b>:</p> <pre class="lang-cpp prettyprint-override"><code>IplImage* DetectAndDrawQuads(IplImage* img) { CvSeq* contours; CvSeq* result; CvMemStorage *storage = cvCreateMemStorage(0); IplImage* ret = cvCreateImage(cvGetSize(img), 8, 3); IplImage* temp = cvCreateImage(cvGetSize(img), 8, 1); cvCvtColor(img, temp, CV_BGR2GRAY); cvFindContours(temp, storage, &amp;contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0)); while(contours) { result = cvApproxPoly(contours, sizeof(CvContour), storage, CV_POLY_APPROX_DP, cvContourPerimeter(contours)*0.10, 0); //*0.2 if((result-&gt;total) == 4) { CvPoint *pt[4]; for(int i=0;i&lt;4;i++) pt[i] = (CvPoint*)cvGetSeqElem(result, i); cvLine(ret, *pt[0], *pt[1], cvScalar(255)); cvLine(ret, *pt[1], *pt[2], cvScalar(255)); cvLine(ret, *pt[2], *pt[3], cvScalar(255)); cvLine(ret, *pt[3], *pt[0], cvScalar(255)); } contours = contours-&gt;h_next; } cvReleaseImage(&amp;temp); cvReleaseMemStorage(&amp;storage); return ret; } int main() { IplImage* img = cvLoadImage("D:\\Database\\eye2.jpg"); IplImage* contourDrawn = 0; cvNamedWindow("original"); cvShowImage("original", img); contourDrawn = DetectAndDrawQuads(img); cvNamedWindow("contours"); cvShowImage("contours", contourDrawn); cvWaitKey(0); return 0; } </code></pre> <p>And this is the <b><i>Pic</b></i> that I used to test the program: <a href="http://i.stack.imgur.com/6FrMQ.jpg" rel="nofollow">Input</a></p> <p>I am trying to get the contours as a preliminary step in finding the facial expression of an inputted face. And this is the <b><i>Result</b></i> when i tried to run the program (<b>Original</b> [left] and <b>Output</b> [right]): <a href="http://i.stack.imgur.com/zQbzQ.jpg" rel="nofollow">Result</a></p> <p>As you can see there seems to be some noise left in the binary image (Which I actually preprocessed before it is being inputted in my find contours program (the codes above)). </p> <h2>My Question is:</h2> <p><br> <br></p> <ol> <li>How to find the points in the contours (e.g, top, bottom, center, leftmost, and rightmost --> essential points to make geometrical calculations to determine facial expression). </li> </ol> <p>Thank you very much if you will help me. So far, this is the best output i could generate regarding finding contours. Also if you can help me extract the contours more accurately then that will be very much appreciated. Thank you. :)</p>
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