如何使用 OpenCV 2.4.3 imRotate?

2022-01-16 00:00:00 opencv image-processing rotation c++

如何使用 OpenCV 2.4.3 实现 imrotate(Mat src,Mat dst,double angle)?有一个函数 warpAffine() 但它做的更多而且令人困惑.它会裁剪超出范围的内容.

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.

我想让它的画布更大，以适应一切.并用黑色填充空白处.

i want it to make a bigger the canvas to fit everything. and fill empty spots with black.

推荐答案

我是这样解决的.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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