Shadow detection in a single image

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8577170
APP PUB NO 20130071016A1
SERIAL NO

13234116

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A digital image is divided into patches of pixels, or “superpixels”, where each of the pixels in the patch has approximately the same color value and each of the patches is of approximately the same size. Subsequently, eigenvalues are generated for each patch based on the color values of the individual pixels in the patch, as expressed in a multidimensional color-space. A ratio between the first largest eigenvalue and the second largest eigenvalue for each patch is determined and is then, subsequently, normalized, either based on the intensity of the corresponding patch or normalized to a range between zero and one. The resulting values are compared to a threshold to identify those regions of the digital image that are deemed to be in shadow, thereby generating a shadow mask for the digital image, or are weighted to generate a shadow probability mask.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MICROSOFT TECHNOLOGY LICENSING, LLCREDMOND, WA30290

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ofek, Eyal Redmond, US 141 2023
Omer, Ido Seattle, US 18 81

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TOSHIBA ENGINEERING CORPORATION (1)
* 6208417 Method and apparatus for detecting minute irregularities on the surface of an object 2 1999
 
INTELLIVIEW TECHNOLOGIES INC. (1)
* 8045761 Detection of environmental conditions in a sequence of images 2 2006
 
LUCENT TECHNOLOGIES INC. (1)
* 6956898 Method and apparatus for dense motion field based coding 7 1999
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 2010/0150,442 METHOD AND APPARATUS FOR SKIN COLOR CORRECTION AND DIGITAL PHOTOGRAPHING APPARATUS USING BOTH 2 2009
 
HONEYWELL INTERNATIONAL INC. (1)
7639878 Shadow detection in images 10 2005
 
RICOH COMPANY, LTD. (1)
* 2010/0232,705 Device and method for detecting shadow in image 4 2010
 
THE RESEARCH FOUNDATION OF STATE UNIVERSITY OF NEW YORK (1)
* 7366323 Hierarchical static shadow detection method 13 2004
 
AT&T CORP. (1)
* 6349113 Method for detecting moving cast shadows object segmentation 34 1998
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
THOMSON LICENSING (2)
* 9349194 Method for superpixel life cycle management 0 2015
* 2015/0332,480 METHOD FOR SUPERPIXEL LIFE CYCLE MANAGEMENT 1 2015
* Cited By Examiner

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