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Sayısal Görüntü İşleme Teknikleri

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Sayısal Görüntü İşleme Teknikleri

Doç. Dr. Mehmet Serdar Güzel

Slides are mainly adapted from the following course page:

http://www.comp.dit.ie/bmacnamee

&&

https://www.tutorialspoint.com/dip/histogram_equalization.htm

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Lecturer

 Instructor: Assoc. Prof Dr. Mehmet S Güzel

 Office hours: Tuesday, 1:30-2:30pm

 Open door policy – don’t hesitate to stop by!

 Watch the course website

 Assignments, lab tutorials, lecture notes

slide

2

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 Image Enhancement 2

slide

3

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Image Histograms

The histogram of an image shows us the distribution of intensity levels in the image Massively useful in image processing, especially in segmentation

Grey Levels

F re qu en ci es

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Histogram Examples (cont…)

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Histogram Equalization

 Histogram equalization is used to enhance contrast. It is not necessary that contrast will always be increase in this. There may be some cases were histogram

equalization can be worse. In that cases the contrast is

decreased.

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Histogram Equalization

 First we have to calculate the PMF (probability mass

function) of all the pixels in this image. If you donot know how to calculate PMF, please visit our tutorial of PMF

calculation.

 Our next step involves calculation of CDF (cumulative

distributive function). Again if you donot know how to

calculate CDF , please visit our tutorial of CDF calculation.

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Histogram Equalization

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Histogram Equalization

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Histogram Examples

A selection of images and their histograms

Im a g e s ta ke n f ro m G o n za le z & W o o d s, D ig ita l I m a g e P ro ce ss in g ( 2 0 0 2 )

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