I think you're putting a bit too much emphasis on the word "cold". Although it could have some connotation of emotional coldness here, I wouldn't say the overall sense of the expression emphasizes that the person has a cold heart. I don't think you'd ever hear "cold balls", as in your title. The word "steel" is an essential element of the expression in the ...


Depending on exactly what you mean by "digging them out" I would have thought that either "extracting" if the image data is useful or "removing/deleting" if the data is discarded would be appropriate. I would say "extracting/deleting pedestrians' images out of the background" though, to clarify the exact goal of the exercise.

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