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Is there any open source library available meant for image filtering effects(like fisheye, old movie etc.), based on opencv library. If you refer to any book/site on opencv which will be helpful for this purpose, I will be extremely grateful.
There isn’t any based on OpenCV, because this is not the purpose of OpenCV. On the other hand, a very popular library for this is ImageMagick.
ImageMagick comprises a set of tools to to create, edit, compose, or convert images, but it also provides a C++ API through Magick++, which is what you should take a look at.
I also suggest you check Fred’s ImageMagick Scripts for a list of several effects that were easily achieved using ImageMagick tools.