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2011-10-19T17:11:54.477
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2011-10-19T17:21:12.980
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I've found a solution that doesn't involve <a href="http://opencv.willowgarage.com/documentation/cpp/geometric_image_transformations.html#cv-warpaffine" rel="noreferrer"><code>warpAffine()</code></a>. But before that, I need to state (for future references) that my suspicion was right, you needed to pass the size of the destination when calling <a href="http://opencv.willowgarage.com/documentation/cpp/geometric_image_transformations.html#cv-warpaffine" rel="noreferrer"><code>warpAffine()</code></a>: <pre><code>warpAffine(image, rotated_img, rot_matrix, rotated_img.size()); </code></pre> As far as I can tell, the black border (caused by writing at an offset) drawed by this function seems to be it's standard behavior. I've noticed this with the C interface and also with the C++ interface of OpenCV running on Mac and Linux, using the versions 2.3.1a and 2.3.0. The solution I ended up using is much simpler than all this warp thing. You can use <a href="http://opencv.willowgarage.com/documentation/cpp/core_operations_on_arrays.html#cv-transpose" rel="noreferrer"><code>cv::transpose()</code></a> and <a href="http://opencv.willowgarage.com/documentation/cpp/core_operations_on_arrays.html#cv-flip" rel="noreferrer"><code>cv::flip()</code></a> to rotate an image by 90 degrees. Here it is: <pre><code>Mat src = imread(argv[1], 1); cv::Mat dst; cv::transpose(src, dst); cv::flip(dst, dst, 1); imwrite("rotated90.jpg", dst); </code></pre> <img src="https://i.stack.imgur.com/Hyel9.jpg" width="250" height="250"> ----I> <img src="https://i.stack.imgur.com/4X4so.jpg" width="250" height="250">
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