chris-rank
commented
2 years ago In addition, there is a novel paper from Google with an improved version of the HDR+ algorithm, which uses a slightly adapted merging in the frequency domain: http://graphics.stanford.edu/papers/night-sight-sigasia19/night-sight-sigasia19.pdf
The differences to the original implementation are small, but the authors claim a significant improvement of noise reduction and motion robustness. I have already checked the formulas and it will be easy to extend the functions I already have implemented.
martin-marek
I would suggest to perform the merging of tiles in the frequency domain as suggested in the original paper. I already have a working function for this task implemented in your app. However, it requires some additional functionality that I have not yet implemented. First initial results already show a better image quality than the current implementation. One disadvantage of my current implementation is that it would only work with Bayer patterns. As the Fourier transformation is a little bit tricky, extension to generic patterns is a lot of work. Furthermore, the 2x2 pattern can be computed using SIMD instructions in Metal, which increases performance quite a bit. I would be more than happy to contribute here.