如何使用OpenCV 2.4.3进行转换? [英] how to imRotate with OpenCV 2.4.3?
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问题描述
如何使用 OpenCV 2.4.3 实现imrotate(Mat src,Mat dst,双角度)?
有一个函数 warpAffine(),但它确实更多并且令人困惑。它会超出界限。
how can i implement imrotate(Mat src,Mat dst,double angle) using OpenCV 2.4.3? there is a function warpAffine() but it does to much more and is confusing. and it crops what goes out of bounds.
我希望它能够使画布更大,以适应所有事物。用黑色填充空白点。
i want it to make a bigger the canvas to fit everything. and fill empty spots with black.
推荐答案
我这样解决了。谢谢你的回答。
I solved it like this. thank to your answer.
Mat rotateImage(const Mat source, double angle,int border=20)
{
Mat bordered_source;
int top,bottom,left,right;
top=bottom=left=right=border;
copyMakeBorder( source, bordered_source, top, bottom, left, right, BORDER_CONSTANT,cv::Scalar() );
Point2f src_center(bordered_source.cols/2.0F, bordered_source.rows/2.0F);
Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
Mat dst;
warpAffine(bordered_source, dst, rot_mat, bordered_source.size());
return dst;
}
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