Histogram Equalization of Grayscale Images

Grayscale image histogram equalization; Gradient enhancement; Histogram specification; Grayscale image histogram data; Direct grayscale transformation: Contrast enhancement techniques

Histograms and Histogram Equalization

Histograms and histogram equalization are techniques used to enhance local contrast in many images, particularly when the useful data in an image has very similar contrast levels. By redistributing brightness values across the histogram, this method improves local contrast without affecting overall contrast. Histogram equalization achieves this by effectively expanding the most frequent intensity ranges. In implementation, this typically involves calculating cumulative distribution functions and mapping original pixel values to new values for optimal dynamic range utilization.