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:
Dec. 08, 1992
Filed:
Dec. 14, 1990
Gary L Taylor, Fort Collins, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A color encoder for reducing visible artifacts even when the values of the respective color signals are truncated during encoding. Since the human eye is most sensitive to luminance variations in the displayed image, luminance errors (and hence visible artifacts) are minimized by adding red and green color error signals to the blue color intensity signal prior to encoding so that luminance detail may be maintained. The blue channel is chosen for this purpose since the human eye is least sensitive to changes in blue and yellow. The color maps for the resulting encoded signals may be scaled such that the red and green values are raised and/or the blue values lowered so as to maintain the same relative intensity of luminance in the displayed image. Errors in the displayed luminance signal may thus be made up to four times smaller without increasing the amount of memory required and without adding expensive processing circuitry.