What's the best way of understanding opencv's warpperspective and warpaffine?

问题

I'm trying to transform a static image to give the illusion of it being taken from different angles. It seems like warpPerspective and warpAffine are the functions I should understand to make this work. However, even after read the OpenCV docs, I'm having difficulty understanding them.

What tutorials/docs should I read that explain them very well?

回答1:

warpPerspective does a projective transformation or homography:

http://en.wikipedia.org/wiki/Homography

warpAffine does an affine transformation:

http://en.wikipedia.org/wiki/Affine_transformation

Abid Rahman, already mentioned a good book. If you want a more theoretical one, Multiple View Geometry is considered the bible of these topics.

回答2:

You didn't mention the language you use.

1. OpenCV documentation has got diagramatic explanation of these functions and that is really good.

2. Apart from that, OpenCV also got a tutorial on this with working C++ code. : Affine Transformations

   ( If you use Python, find it here : Affine Transform)

3. And Gary Bradsky's book "Learning OpenCV" has got a good explanation of this, if you like, on page 163. You can read it from "Google Books"

来源：https://stackoverflow.com/questions/10962228/whats-the-best-way-of-understanding-opencvs-warpperspective-and-warpaffine