Histogram Equalization

1. What is meant by histogram equalization?
2. What are the applications of histogram equalization?
3. Is histogram equalization the same as contrast stretching?

What is meant by histogram equalization?

Histogram equalization is a technique for adjusting image intensities to enhance contrast. Let f be a given image represented as a mr by mc matrix of integer pixel intensities ranging. from 0 to L − 1. L is the number of possible intensity values, often 256.

What are the applications of histogram equalization?

Histogram equalization is a straightforward image-processing technique often used to achieve better quality images in black and white color scales in medical applications such as digital X-rays, MRIs, and CT scans.

Is histogram equalization the same as contrast stretching?

In Histogram equalization, you want to flatten the histogram into a uniform distribution. In contrast stretching, you manipulate the entire range of intensity values. Like what you do in Normalization. Note that contrast stretching is also called Histogram stretching.