Video contrast enhancement with sub-segments

Patent metadata

Field	Value
Publication number	US-9245331-B2
Application number	US-201414283007-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	May 20, 2014
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A system and method for image contrast enhancement using sub-segments. A coarse piecewise linear transform is formed based on the intensity distribution in an image, the segments of the piecewise linear transform selected to produce, when the piecewise linear transform is applied to the image, an improved intensity distribution, e.g., one approximating a Rayleigh distribution. A fine piecewise linear transform is formed by forming sub-segments at each of the breakpoints of the coarse piecewise linear transform.

First claim

What is claimed is:

1. A method for processing an input image comprising intensity values, the method comprising:
calculating an intensity value distribution for the input image;
forming a first piecewise linear transform,
the first piecewise linear transform configured to transform the intensity distribution of the input image,
the first piecewise linear transform comprising a sequence of first segments,
each segment of the sequence of first segments having a gain,
the se…

Assignees

• Raytheon Co

Inventors

• Beardsley Christopher J
• Do Luan B

Classifications

• G06T5/009 Primary

  Physics · mapped topic

• G06K9/40

  Physics · mapped topic

• G06T2207/20016

  Physics · mapped topic

• G06T2207/10048

  Physics · mapped topic

• G06T2207/20204

  Physics · mapped topic