[英]How can an image be rotated with OpenCV with a custom colour for the gaps around the edge?
I would like to rotate an image in OpenCV (I'm currently doing it this way image manipulation SO answer ) but would like to specify the colour used to fill the gaps created by the rotation - by default, it's black (see below) 我想在OpenCV中旋转图像(我目前正在以这种方式进行图像处理,例如SO Answer ),但想指定用于填充旋转所产生的间隙的颜色-默认情况下为黑色(请参见下文)
How could this be done? 怎么办呢?
I think the answer lies in the official doc : 我认为答案在于官方文档 :
C: void cvWarpAffine(const CvArr* src, CvArr* dst, const CvMat* map_matrix, int flags=CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS, CvScalar fillval=cvScalarAll(0) )
where 哪里
CvScalar fillval=cvScalarAll(0)
specifies the fill color of the "gap". CvScalar fillval=cvScalarAll(0)
指定“间隙”的填充颜色。
Just specify the fillval
with a color scalar when calling this function. 只需在调用此函数时用颜色标量指定
fillval
。
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