Is your feature request related to a problem? Please describe.

In the current image resizing algorithms in GIL, there is nearest neighbour and bilinear sampler. But bicubic sampler is not available. Bicubic interpolation is also a very popular algorithm which might be needed useful for resizing.

Describe the solution you'd like

Implementing a bicubic sampler in sampler.hpp

C++ Example

So the way I have currently implemented it is using this as a reference, here

But there are issues with my implementation, I cannot figure out why image artifacts are being generated in the output image.

Can someone help me with what I am missing?

Describe alternatives you've considered

Another method for bicubic interpolation is using convolution like this

Additional context

Bicubic interpolation is a very popular technique for image interpolation because it is smoother than bilinear interpolation and nearest neighbour interpolation, though it requires higher computational power.

PR #588

Future milestones :

• (maybe?) Clean up sampler.hpp comments
• Add tests
• Ensure all tests pass