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Purdue University
School of Electrical and Computer Engineering
Digital Image Processing Laboratories

Pointwise Operations and Gamma

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Abstract

This laboratory discusses various types of point operations applied to images.  Enhancement techniques such as histogram equalization and contrast stretching are discussed.  The concept of gamma which describes a nonlinear behavior of display devices is covered, as well as the point operation used to compensate for this nonlinearity.

To run this laboratory, you will need:

• Matlab with both the signal and image processing tool boxes.
• An application for displaying TIFF images.
• An ANSI C compiler such as gcc or MS Visual Studio.

Laboratory Procedure - Instructions for running the laboratory in pdf format.

race.tif - Image used in lab.

kids.tif - Image used in lab.

linear.tif - Image stored on a linear scale.

gamma15.tif - Image gamma corrected for gamma=1.5.

Questions or comments should be sent to:

Prof. Charles A. Bouman, School of Electrical and Computer Engineering, Purdue University, West Lafayette IN 47907; bouman@ecn.purdue.edu