OpenCV:如何旋转IplImage? [英] OpenCV: how to rotate IplImage?

问题描述

我需要将图像旋转很小的角度，例如1-5度. OpenCV 是否提供简单的方法?通过阅读文档，我可以假定应该涉及到 getAffineTransform()，但是没有直接的示例来做类似的事情:

I need to rotate an image by very small angle, like 1-5 degrees. Does OpenCV provide simple way of doing that? From reading docs i can assume that getAffineTransform() should be involved, but there is no direct example of doing something like:

IplImage *rotateImage( IplImage *source, double angle);

推荐答案

如果您使用OpenCV> 2.0，那么就像

If you use OpenCV > 2.0 it is as easy as

using namespace cv;

Mat rotateImage(const Mat& source, double angle)
{
    Point2f src_center(source.cols/2.0F, source.rows/2.0F);
    Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
    Mat dst;
    warpAffine(source, dst, rot_mat, source.size());
    return dst;
}

注意:角度以度为单位，而不是弧度.

Note: angle is in degrees, not radians.

有关更多详细信息，请参见C ++接口文档，并根据需要进行调整:

See the C++ interface documentation for more details and adapt as you need:

• getRotationMatrix
• warpAffine

• getRotationMatrix
• warpAffine

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