Image Negative

The Negative of the image was found out by replacing any Intensity 'i' in the original image by 'i-1' in the negative.


`Original Image`	`Negative Image`

Contrast Stretching

Contrast Stretching on the image shown below was done. It can be noticed that the source image is dull and most of its grey levels
are cluttered up in the center of the histogram. After contrast stretching these gray level have been 'stretched' giving a better
contrast to the image.First the transfer function used for the process is shown.

Original Image Image after Contrast Stretching

Histogram of the Original Image Hitsogram after Contrast Stretching

Thresholding

The same routine can also be used for thresholding (i.e. changing the image to black and white) by using an appropriate tranfer function
as shown.

Image after thresholding

Page last updated on 28 January, 2004.	`AT cse.iitd.ac.in`	© Parag Chaudhuri , 2009


`Original Image`	`Image after Contrast Stretching`

`Histogram of the Original Image`	`Hitsogram after Contrast Stretching`