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POImage copied in ROI doesn't follow camera c++. How to fix this?
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  1. POImage copied in ROI doesn't follow camera c++. How to fix this?
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    copied!<p>I work on Windows7 x64 with opencv and Visual Studio 2010 on c++ language.</p> <p>I created a project in which I show to my camera a rectangular area (call <strong><em>squared_surface</em></strong>). This area is recognized by tracing a rectangle with <code>findSquare ()</code> and <code>drawSquares ()</code> of opencv file <code>squares.cpp</code>. On this rectangle I create a ROI and there I copy an image (let's call <strong><em>copied_image)</em></strong></p> <p>My problem is that when I rotate <strong><em>squared_surface</em></strong> (in front of camera), <strong><em>copied_image</em></strong> does not follow it.</p> <p>I think I need to use the functions <code>getPerpective ()</code> and <code>warpPerspective ()</code>, but I do not know how. Can anyone help me?</p> <p>Here's the code:</p> <pre><code>int main(){ vector&lt;vector&lt;Point&gt; &gt; squares; cv::VideoCapture cap(0); for (;;) { cv::Mat image; cap &gt;&gt; image; findSquares(image, squares); for (size_t i = 0; i &lt; squares.size(); i++) { Rect rectangle = boundingRect(Mat(squares[i])); if((rectangle.width&lt;=630)&amp;&amp; (rectangle.width &gt;= 420) &amp;&amp; (rectangle.height&lt;= 490) &amp;&amp;(rectangle.height &gt;= 250 )) { cv::Size dsize = Size(rectangle.width, rectangle.height); Mat img1 = imread("scacchiera.jpg"); cv::resize(img1,img1,dsize,0,0, INTER_LINEAR); Rect roi (rectangle.x, rectangle.y,rectangle.width, rectangle.height); Mat imageRoi(image, roi); img1.copyTo(imageRoi); } } drawSquares(image, squares); imshow("camera",image); if(waitKey(30) &gt;= 0) break; } return 0; } </code></pre> <p><img src="https://i.stack.imgur.com/QD8Wx.jpg" alt="enter image description here"> <img src="https://i.stack.imgur.com/k8Qaq.jpg" alt="enter image description here"></p> <p>Thanks!</p> <p><strong>EDIT.</strong> I was thinking of rotating <strong>Copied_image</strong>, so it follows <strong>Squared_surface</strong>, but I need to calculate the angle of rotation of the rectangle identified by the camera (drawn in red in the above images). Is there a way to calculate this angle? </p> <p>Or how can I do so that <strong>Copied_image</strong> follows <strong>Squared_surface</strong> when I rotate squared_surface?</p> <p>Help me, please!</p>
 

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