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Worth noting it's ~100-lines of Go code that's quite readable:

https://github.com/n7olkachev/imgdiff/blob/master/pkg/imgdif...

https://github.com/n7olkachev/imgdiff/blob/master/pkg/yiq/de...

This is a go question but I thought go funcs took less than a thread. This assigns one go func per cpu. Can it be faster with more go funcs per cpu?

Likely not. Green threads concept (goroutines) makes a lot of sense if you block on I/O (such as reading DB, making RPCs), you can multiplex a thread. However, in this case, there is not a lot of I/O involved so regular CPU-bound parallel programming practices apply.

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