How is the effectiveness metric in Otsu's method (graythresh) calculated?

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coolguynp
coolguynp 2015-5-19
回答： Image Analyst 2015-5-19
What is the mathematical formula used to evaluate threshold effectiveness metric in graythresh method? What is the best way to use this metric?

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Image Analyst
Image Analyst 2015-5-19
I don't know and I wouldn't worry about it. It either works or it doesn't, and in my experience, it usually doesn't. It only seems to work well with images that have a uniform background and a nicely bimodal histogram, which is rarely encountered in the real world except in things like machine vision apps that are looking at parts, like for a robot "pick and place" type of app.

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