Module 1.2: Histogram Equalization: Solved Numerical Example 2 | Digital Image Processing

Publicado em: 29 Setembro 2024
no canal de: Electronics By Ajay Sir
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📊 Mastering Histogram Equalizations: Step-by-Step Tutorial! 📊

In this video, I have discussed step by step procedure to solve numerical question based on Histogram Equalization.

Histogram: Histogram is a discrete function formed by counting the number of pixels that have a certain gray level in the image

In the dark images, components of the histogram are concentrated on the lower (dark) side of the gray scale. In bright images, the histogram is biased towards the higher side of the gray scale

In low contrast, the histogram will be narrow & centered towards the middle of the gray scale. In high contrast, a large variety of gray tones occupy the entire range of possible gray levels

Histogram Equalization:
1. It is the process that transforms the intensity values so that the histogram of the output image approximately matches the flat (uniform) histogram.

2. The aim is to create an image with equally distributed brightness levels over the whole brightness scale.

3. We can do it by adjusting the probability density function (pdf) of the original histogram of the image so that the probability spread equally.

4. Histogram equalization results are similar to contrast stretching but offer the advantage of full automation

5. Histogram Equalization automatically determines a transformation function to produce a new image with a uniform histogram.

You may refer the following books to practice more numerical questions:

1. R.C.Gonzalez and R.E.Woods, “Digital Image Processing”, Prentice Hall, 3rd Edition,2011.

2. S. Sridhar , “Digital Image Processing”, Oxford University Press,2011

If you have any suggestion/feedback or if you want videos on any topic related to digital image processing , please do comments in my video or write email to me: ask2ajaysir@gmail.com

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