It was a bit tricky to work with Halide. The Halide code itself is beautiful, but it depends on LLVM which takes forever to build and link, and I ran into some snags with Windows support. I originally wanted to write the whole algorithm in Halide and run it on the GPU, but it turned out that the Halide language isn't expressive enough to implement a Hough transform. I had to write that bit in C and I'm currently only using Halide to do some more straightforward image processing tasks like edge detection filters, blurring, and resampling. It works really well for that though, and performance-wise it runs rings around the naive nested C for loops that I would otherwise have to write.