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I have an image where I want to find a specific location (coordinate) based on its color. For example 
I want to find coordinates of edges of this Black box.
How can i detect Black color in this image in Java?
Note: My target is to develop a program to detect eyes in a face
as far as I know Fourier transform is used in image processing. With that you get your picture in frequency domain that represents a signal (in case of image signal is two dimensional). You can use Fast Fourier Transform algorimth (FFT in java, Fun with Java, Understanding FFT). There’s a lot of papers about eye detection issue you can read and take inspiration from: