Techniques

Raman B. Paranjape 1 Introduction 3

University of Regina 2 Preliminaries and Definitions 3

3 Pixel Operations 4

3.1 Compensation for Nonlinear Characteristics of Display or Print Media • 3.2 Intensity Scaling • 3.3 Histogram Equalization

4 Local Operators 7

4.1 Noise Suppression by Mean Filtering • 4.2 Noise Suppression by Median Filtering • 4.3 Edge Enhancement • 4.4 Local-Area Histogram Equalization

5 Operations with Multiple Images 15

5.1 Noise Suppression by Image Averaging • 5.2 Change Enhancement by Image Subtraction

6 Frequency Domain Techniques 16

7 Concluding Remarks 16

References 17

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