Patent US8094238 - Video signal processing device and video signal processing method

US008094238B2

(12) United States Patent

Tagami (54) VIDEO SIGNAL PROCESSING DEVICE AND VIDEO SIGNAL PROCESSING METHOD (75) Inventor: Tomohisa Tagami, Osaka (JP) (73) Assignee: Panasonic Corporation, Osaka (JP) ( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. l54(b) by 703 days. (21) Appl. No.: 12/295,114 (22) PCT Filed: Apr. 10, 2007 (86) PCT No.: PCT/JP2007/057896 § 371 (C)(1), (2), (4) Date: Sep. 29, 2008 (87) PCT Pub. No.: WO2007/119718 PCT Pub. Date: Oct. 25, 2007 (65) Prior Publication Data US 2009/0251596 A1 Oct. 8, 2009 (30) Foreign Application Priority Data Apr. 11,2006 (JP) ............................... .. 2006-108698 (51) Int. Cl. H04N 5/202 (2006.01)

(52) U.S. Cl. ..................................................... .. 348/674 (58) Field of Classification Search ......... .. 348/674-677 See application file for complete search history.

(56) References Cited U.S. PATENT DOCUMENTS 4,786,968 A * ll/I988 Kutner ........................ .. 348/674 7,860,339 B2 * I2/2010 Yamashita et al. .......... .. 382/274

FOREIGN PATENT DOCUMENTS

JP 2001-184016 A 7/2001

JP 2002-016805 A 1/2002

JP 2003-348442 A 12/2003

JP 2004-133033 A 4/2004

JP 2004/140702 5/2004

WO 02/01850 1/2002 OTHER PUBLICATIONS

English language Abstract of JP 2001-184016 A. English language Abstract of JP 2002-016805 A. English language Abstract of JP 2003-348442 A. English language Abstract of JP 2004-133033 A. English language Abstract of JP 2004-140702.

* cited by examiner

Primary Examiner * Michael Lee

(74) Attorney, Agent, or Firm * Greenblum & Bernstein, P.L.C.

(57) ABSTRACT

A video signal processing device is a video signal processing device for converting an input first video signal to a second video signal, and inputting to a display panel, the video signal processing device including an input unit for receiving an input of a set value of the second video signal to be converted and output in correspondence to a signal level for each of a plurality of sample points of the signal level of the first video signal; a calculating unit for interpolation calculating the signal level of the second video signal to be converted and output for the signal level between each sample points; and a control unit for transferring a conversion table including a set value of the second video signal for each sample point of the first video signal and an interpolation calculated interpolation value between each sample points to a memory unit; wherein the memory unit converts to the second video signal of a corresponding signal level based on the conversion table according to the signal level of the input first video signal, and outputs the second video signal.

12 Claims, 12 Drawing Sheets

SET VALUE OF SECOND VIDEO

SIGNAL FOR FIRST VIDEO SIGNAL

OF SAMPLE POINTS

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Video signal processing device and video signal processing method