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:
Jun. 23, 2009
Filed:
Jul. 22, 2004
Eric Jeffrey, Richmond, CA;
Phil Van Dyke, Surrey, CA;
Eric Jeffrey, Richmond, CA;
Phil Van Dyke, Surrey, CA;
Seiko Epson Corporation, Tokyo, JP;
Abstract
Histogram circuitry is provided to increment a tonal value tally corresponding to received pixel data without immediately writing the incremented tally back to a histogram table within a main memory. Instead, the tonal value and corresponding incremented tonal value tally are stored in a temporary memory of the histogram circuitry. Since received pixel data has a high likelihood of having the same tonal value as recently received pixel data, the tonal value of the received pixel data is first checked for a match with one of the recently received tonal values stored in the temporary memory. If the received tonal value is present in the temporary memory, there is no need to access the histogram table within the main memory to retrieve the corresponding tally. The tally corresponding to the received tonal value can simply be incremented in the temporary memory of the histogram circuitry.