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quatrope / astroalign

A tool to align astronomical images based on asterism matching
MIT License
140 stars 44 forks source link

Implement "downsampling" #69

Open ysBach opened 3 years ago

ysBach commented 3 years ago

I've just encountered ~10 4K images to combine. I am using Macbook Pro 15" (MBP 15" [2018, macOS 11.4, i7-8850H (2.6 GHz; 6-core), RAM 16 GB (2400MHz DDR4), Radeon Pro 560X (4GB)]), and it takes ~ 3-4 seconds to register an image. I tested with 4x4 binning to the data, and it was << 1 sec order (as expected).

I guess something like bin_factors=(2, 2) can be implemented to aa.register...

(of course I can do this by myself using (1) bin each image, (2) find transform, (3) slightly modify the transform matrix, (4) apply the updated transform. But it is a bit too much of coding...)

martinberoiz commented 3 years ago

Hi @ysBach, that is a good suggestion.

I have a few other features that are in line to imlement and I will add this one to the list. I will probably plan a sprint soon to code these additions.