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Histogram Operations

A histogram is a chart that records the frequency with which pixels of various intensities appear in an image. The histogram gives you information about the spread of intensity values in a image. Is the image mainly dark, or mainly light? Does the image make use of most of the available intensity values, or are its pixels concentrated near just a few intensities? Are certain intensities underrepresented? The histogram represents the answers to these sorts of questions. This chapter describes histograms and the histogram operations provided by vImage.

Contents:

Histograms for Images in Integer Formats
Histograms For Images In Floating-Point Formats
Histogram Operations
Lookup Tables (LUTs)
Equalization
Histogram Specification
Contrast Stretch
Ends-In Contrast Stretch

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