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POcreate a customized sequence of CvPoint in OpenCv
 

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  1. POcreate a customized sequence of CvPoint in OpenCv
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    <p>I want to use cvDrawContours to draw my own contours created from CvSeq (normally, contours are retured from other functions of OpenCV). This is my solution but it does not work :(</p> <pre><code>IplImage* g_gray = NULL; CvMemStorage *memStorage = cvCreateMemStorage(0); CvSeq* seq = cvCreateSeq(0, sizeof(CvSeq), sizeof(CvPoint)*4, memStorage); CvPoint points[4]; points[0].x = 10; points[0].y = 10; points[1].x = 1; points[1].y = 1; points[2].x = 20; points[2].y = 50; points[3].x = 10; points[3].y = 10; cvSeqPush(seq, &amp;points); g_gray = cvCreateImage( cvSize(300,300), 8, 1 ); cvNamedWindow( "MyContour", CV_WINDOW_AUTOSIZE ); cvDrawContours( g_gray, seq, cvScalarAll(100), cvScalarAll(255), 0, 3); cvShowImage( "MyContour", g_gray ); cvWaitKey(0); cvReleaseImage( &amp;g_gray ); cvDestroyWindow("MyContour"); return 0; </code></pre> <p>I picked the method to create a customized contour sequence from CvPoint from this post <a href="https://stackoverflow.com/questions/6984994/opencv-sequences-how-to-create-a-sequence-of-point-pairs">OpenCV sequences -- how to create a sequence of point pairs?</a></p> <p>FOr the second try, I did it with Cpp OpenCV: </p> <pre><code>vector&lt;vector&lt;Point2i&gt;&gt; contours; Point2i P; P.x = 0; P.y = 0; contours.push_back(P); P.x = 50; P.y = 10; contours.push_back(P); P.x = 20; P.y = 100; contours.push_back(P); Mat img = imread(file, 1); drawContours(img, contours, -1, CV_RGB(0,0,255), 5, 8); </code></pre> <p>Perhaps I used the data incorrectly. The compiler alerts errors &amp; does not allow push_back points to vectors like that. Why??</p> <p>The error is like this: Error 2 error C2664: 'std::vector&lt;_Ty>::push_back' : cannot convert parameter 1 from 'cv::Point2i' to 'const std::vector&lt;_Ty> &amp;'</p>
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    1. COI have tried OpenCV C++. But still cannot work out. Perhaps I used it incorrectly. I added my trial in the question
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