What is the functionality of warpImage which is an inherited member function from shape transformer

asked 2017-05-26 03:25:11 -0600

virtual void cv::ShapeTransformer::warpImage ( InputArray transformingImage, OutputArray output, int flags = INTER_LINEAR, int borderMode = BORDER_CONSTANT, const Scalar & borderValue = Scalar() ) const pure virtual

Can somebody brief me the idea behind this function and its utility?

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answered 2017-05-26 03:48:45 -0600

kbarni

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Short answer: it's a pure virtual function, so it has no utility and the idea is to provide a common function interface for the inherited classes.

Longer answer: ShapeTransformer is a virtual class with no functionality. It's a common base for the Affine and ThinSpline transformers, so OpenCV's algorithms can use both classes using the same code (hence the "pure virtual" function).

That said, you can avoid to use directly either the AffineTransformer or ThinPlateSplineShapeTransformer classes, it's more simple to use the geometric image transformation functions, like WarpAffine, WarpPerspective, Remap, LogToPolar, Undisort, etc.