Histogram equalization

A histogram which is zero apart from a central area containing strong peaks is transformed by stretching the peaked area to fill the entire x-axis.
Histograms of an image before and after equalization.

In image processing, Histogram equalization is a method of contrast adjustment using the image's histogram.

Histogram equalization is a specific case of the more general class of histogram remapping methods. These methods seek to adjust the image to make it easier to analyze or improve visual quality.

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