The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 2006
Filed:
Mar. 14, 2001
Xiao-fan Feng, Vancouver, WA (US);
Jon Matthew Speigle, Vancouver, WA (US);
John Charles Dalrymple, Portland, OR (US);
James Zhixin Chang, Vancouver, WA (US);
Xiao-fan Feng, Vancouver, WA (US);
Jon Matthew Speigle, Vancouver, WA (US);
John Charles Dalrymple, Portland, OR (US);
James Zhixin Chang, Vancouver, WA (US);
Sharp Laboratories of America, Inc., Camas, WA (US);
Abstract
A method for background adjustment. A background lightness level in an original image is estimated. Pixels are then converted to a luminance-chrominance color space. Pixels have lightness levels equal to the background lightness level are mapped to a value corresponding to white as background pixels. Chroma values for the background pixels are compared to a threshold and adjusted as needed, either by adjusting the lightness value or by removing the chrominance values. The luminance-chrominance data is then converted to output space.