Katherine M Simonson

US Patent:

8103116, Jan 24, 2012

Filed:

Mar 2, 2009

Appl. No.:

12/396109

Inventors:

Katherine M. Simonson - Cedar Crest NM, US
Tian J. Ma - Albuquerque NM, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G06K 9/40

US Classification:

382255, 382236

Abstract:

A technique for detecting changes in a scene perceived by a staring sensor is disclosed. The technique includes acquiring a reference image frame and a current image frame of a scene with the staring sensor. A raw difference frame is generated based upon differences between the reference image frame and the current image frame. Pixel error estimates are generated for each pixel in the raw difference frame based at least in part upon spatial error estimates related to spatial intensity gradients in the scene. The pixel error estimates are used to mitigate effects of camera jitter in the scene between the current image frame and the reference image frame.

US Patent:

7912321, Mar 22, 2011

Filed:

Dec 19, 2005

Appl. No.:

11/305903

Inventors:

Katherine M. Simonson - Cedar Crest NM, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G06K 9/00
G06K 9/50
G06K 9/32

US Classification:

382294, 382103, 382199, 382296

Abstract:

In an image registration method, edges are detected in a first image and a second image. A percentage of edge pixels in a subset of the second image that are also edges in the first image shifted by a translation is calculated. A best registration point is calculated based on a maximum percentage of edges matched. In a predefined search region, all registration points other than the best registration point are identified that are not significantly worse than the best registration point according to a predetermined statistical criterion.