Find a specific color in the image

I have an image where I want to find a specific location (coordinate) based on its color. For example, enter image description here I want to find the coordinates of the edges of this black box.

How can I determine the black color on this image in Java?

Note. My goal is to develop a program for detecting eyes in the face.

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Source: https://habr.com/ru/post/1796622/


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