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The regular NLM takes a lot of time - what should I do?

The NLM, as described, assumes that for each pixel, the average is done over the entire image. It might be a good idea to only compute the average over close-by pixels, and not the entire image. Play with the value of "close-by" to find a good result.

Task 8 - The denoising function needs a directory to write the results to, and it is not provided in task 8. What do we do?

Create IN tmpDir a directory Result and give this folder to the denoising function. (While experimenting for parameters, it would be wise to delete this folder every experiment so your disk won't fill up

Adding noise to image - we get values outside [0,255] - should we leave them as is, or truncate them?

To make the simulations realistic, images after adding noise should be truncated, i.e., any value below 0 should be set to 0, and any value above 255 should be set to 255. This violates slightly the Gaussian noise assumption, but it is more realistic.