Use 1 block frame at a time in denoising
Use 1 block frame at a time in denoising

Seems that using any more than 1 frame starts slowing things down
computationally. Particularly issues start to show up if the frame size
gets large. As the computations are embarrassingly parallel per frame,
it doesn't really matter how many we work with at a time (unless there
are IO or memory constraints), so using 1 frame at a time ends up being
fine.

nanshe-org/nanshe_workflow,DudLab/nanshe_workflow