Adept AdeptSight User Guide - Manual (Page 436)

Histogram Operations
applied to an unsigned 8-bit image: Equalization, Stretching, Light Threshold and Dark
Threshold.
Example Of Image After Some Common Histogram Operations
Equalization
The Equalization operation enhances the Input Image by flattening the histogram of the
Input Image.
Stretching
The Stretching operation stretches (increases) the contrast in an image by applying a simple
piecewise linear intensity transformation, based on the histogram of the input image.
Light Threshold
The Light Threshold operation changes each pixel value depending on whether they are less
than or greater than the specified threshold. If an input pixel value is less than the threshold,
the corresponding output pixel is set to the minimum acceptable value. Otherwise, it is set to
the maximum acceptable value.
Dark Threshold
The Dark Threshold operation changes each pixel value depending on whether they are less
than or greater than the specified threshold. If an input pixel value is less than the threshold,
the corresponding output pixel is set to the maximum presentable value. Otherwise, it is set
to the minimum acceptable value.
AdeptSight User's Guide, Version 3.2.x, Updated: 8/23/2012
Page 436