Implement full affine transform

[opatiny]

We want a function that takes in two sets of N points and returns the best 2x3 transformation matrix between them.
image

https://nghiaho.com/?p=2208

We need a minimum of 3 points to get the affine transform. The best affine transform can then be found using RANSAC.

[targos]

Shouldn't this issue be in https://github.com/mljs/affine-transform ?

[opatiny]

Oh no.... I got confused again...

Actually they are 2 different things I think:

1. the function that takes only 3 points and returns the matrix -> this should indeed go to affine-transform
2. the function that takes more than 3 points and that returns the best fitting transform (using ransac) -> put that in image-js-ts?

Currently for the partial affine transform, point 2 is made in image-js-ts, but I feel that it would be nearly more intuitive to have the function fitting N points in affine-transform as well. Indeed this function is completely unrelated to images.

This would imply migrating some of the code from image-js-ts to ml-affine-transform, which would then have ml-ransac as a dependency.

Wdyt @targos ?

[targos]

I'd be fine migrating code from image-js to ml-affine-transform, especially since the existing getAffineTransform function over there already takes many points (not just 3).