Image version 0.28.0 is just out. This version brought to you by @sodapopcan who worked out how to implement warp perspective using Nx and vix. Thanks for the PR and collaboration - that was a lot of fun. The changelog is:
Bug Fixes
- Fixes resizing images with alpha bands. Resizing images with alpha bands requires premultiplying the alpha band into the image and reversing that after resizing.
Enhancements
-
Adds
Image.warp_perspective/4to apply a warp transformation to an image. Thanks very much to @sodapopcan for the PR and collaboration. -
Adds
Image.straighten_perspective/3to apply a warp perspective that straighens the image. It is basicallyImage.warp_perspective/4with algorithmically deriveddestinationparameter. -
Adds
Image.map/2which applies a transformation matrix (not a convolution kernel) to an image. A transformation matrix can be returned fromImage.transform_matrix/3. These two functions underpinImage.warp_perspective/4. -
Adds
Image.crop/2which is a variation ofImage.crop/5that takes the same format of bounding box as that applied toImage.warp_perspective/4making it easy to apply a warp transform and then crop to the transformed area. Note that cropping requires that the bounding box be a rectangle, not an arbitrary quadrilateral.
Cant get it to run though 
it complains about my vectors and I’m stuck 
And I managed to write a script that swaps a billboard/sign 
