opencv图像处理之仿射变换

void cv::warpAffine	(	InputArray	src,
		OutputArray	dst,
		InputArray	M,
		Size	dsize,
		int	flags =  INTER_LINEAR ,
		int	borderMode =  BORDER_CONSTANT ,
		const Scalar &	borderValue =  Scalar()
	)

在图像上运用仿射变换

warpaffine功能运用指定的矩阵对源图像进行处理：

dst(x,y)=src(M11x+M12y+M13,M21x+M22y+M23)

when the flag WARP_INVERSE_MAP is set. Otherwise, the transformation is first inverted with cv::invertAffineTransform and
then put in the formula above instead of M. The function cannot operate in-place.

Parameters

src	源图像
dst	输出图像与源图像大小和通道数一样的
M	2×3 t转换矩阵
dsize	输出图像的大小
flags	插值的结合 (see cv::InterpolationFlags) 和可选的 WARP_INVERSE_MAP 代表M 是逆向的转换( dst→src ).
borderMode	像素外推方法 (see cv::BorderTypes); when borderMode=BORDER_TRANSPARENT, it means that the pixels in the destination image corresponding to the "outliers" in the source image are not modified by the function.
borderValue	value used in case of a constant border; by default, it is 0