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POVector out of range
 

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  1. POVector out of range
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    <p>I am trying to draw a bounding box around contours using OpenCV. This is a real time application where all the images are grabbed from a camera real time, and Following is the important part of the code</p> <p><strong>RTMotionDetector.h</strong></p> <pre><code>vector&lt;vector&lt;Point&gt;&gt; *contours; vector&lt;vector&lt;Point&gt;&gt; *contoursPoly; </code></pre> <p><strong>RTMotionDetector.cpp</strong></p> <pre><code>RTMotionDetector::RTMotionDetector(void) { current = new Mat(); currentGrey = new Mat(); canny = new Mat(); next = new Mat(); absolute = new Mat(); cam1 = new VideoCapture(); cam2 = new VideoCapture(); contours = new vector&lt;vector&lt;Point&gt;&gt;(); contoursPoly = new vector&lt;vector&lt;Point&gt;&gt;(); boundRect = new vector&lt;Rect&gt;(); } double RTMotionDetector::getMSE(Mat I1, Mat I2) { Mat s1; //Find difference cv::absdiff(I1, I2, s1); // |I1 - I2| imshow("Difference",s1); //Do canny to get edges cv::Canny(s1,*canny,30,30,3); imshow("Canny",*canny); //Find contours findContours(*canny,*contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE); //System::Windows::Forms::MessageBox::Show(""+contours-&gt;size()); //Draw contours drawContours(*current,*contours,-1,Scalar(0,0,255),2); for(int i=0;i&lt;contours-&gt;size();i++) { cv::approxPolyDP(Mat((*contours)[i]),(*contoursPoly)[i],3,true); //boundRect[i] = boundingRect(contoursPoly[i]); } } </code></pre> <p>As soon as the following part gets executed, I am getting an error</p> <pre><code>cv::approxPolyDP(Mat((*contours)[i]),(*contoursPoly)[i],3,true); </code></pre> <p>Here is the error I am getting. </p> <p><img src="https://i.stack.imgur.com/stgqP.png" alt="enter image description here"></p> <p>If I comment out that piece of code, then no issues. I know this is <code>ArrayIndexOutOfBounds</code> issue but I really can't find a fix. May be because I am new to Windows Programming. </p> <p>It is very important that <code>contours</code> stay as a pointer instead of local variable, because local variable slowed the program in an unbelievable way. </p> <p>Please help me to fix this issue. Thank you.</p>
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    1. USDaniel Daranas
    1. USYohan Weerasinghe
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    1. COI've never seen so many `new`s in one place. Please use smart pointers **if you absolutely must have pointers**.
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      1. USchris
    2. COPress Retry, debug the application. Chances are you're not filling your vector with anything.
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      1. USThe Forest And The Trees
    3. CO@TheForestAndtheTrees: I did. Nothing changed :(
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      1. USYohan Weerasinghe
 

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