Equalization

Performing image equalisation and then Jpeg compression

Performing image equalisation and then Jpeg compression
  1. What is equalization in image?
  2. What happens if we apply histogram equalization twice to the same image?

What is equalization in image?

Histogram Equalization is a computer image processing technique used to improve contrast in images . It accomplishes this by effectively spreading out the most frequent intensity values, i.e. stretching out the intensity range of the image.

What happens if we apply histogram equalization twice to the same image?

The answer is no change. If histogram equalization is applied twice, there is no change. This is because a histogram equalization is idempotent. In other words, the value of the histogram equalization does not change when it is multiplied by itself.

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