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United States Patent (10) Patent No.: US 8.411.206 B2 Pettitt Et Al

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United States Patent (10) Patent No.: US 8.411.206 B2 Pettitt Et Al USOO841 1206B2 (12) United States Patent (10) Patent No.: US 8.411.206 B2 Pettitt et al. (45) Date of Patent: Apr. 2, 2013 (54) APPARATUS AND METHOD FOR DECODING 6,342,898 B1* 1/2002 Pettitt ........................... 345 601 EXTENDED COLOR SPACE DATA 6,594,387 B1 * 7/2003 Pettitt et al. ................... 382, 167 7,164,397 B2 1/2007 Pettitt et al. 7,181,065 B2 2/2007 Pettitt et al. (75) Inventors: Gregory S. Pettitt, Farmersville, TX 7,184,080 B2 * 2/2007 Kehtarnavaz et al. ..... 348,223.1 (US); Rajeev Ramanath, Plano, TX 7,545,533 B2 * 6/2009 Oket al. ............ ... 358/19 (US) 7,688,331 B2* 3/2010 Yoon et al. .. ... 345,591 2001 OO15774 A1* 8, 2001 Endo et al. .. ... 348,807 (73) Assignee: Texas Instruments Incorporated, 2004/0199346 A1* 10, 2004 Stokes ............................ TO2.88 Dallas, TX (US 2005/0062756 A1* 3/2005 Dyke et al. ... 345 604 allas, TX (US) 2006/0203120 A1* 9, 2006 Jun ......... ... 348,364 - 2007/009 1213 A1* 4/2007 Jaspers ... 348,687 (*) Notice: Subject to any disclaimer, the term of this 2007, 0109431 A1* 5, 2007 Lee ......... ... 348,254 patent is extended or adjusted under 35 2007, 0133021 A1* 6, 2007 Lee et al. .... ... 358/19 U.S.C. 154(b) by 1318 days. 2007/0140558 Al 6/2007 Pettitt et al. ... 382/167 2008/0284.915 A1 * 1 1/2008 Figueroa et al. ....... ... 348,649 (21) Appl. No.: 11/965,671 2009,0085924 A1 ck 4/2009 Ben-Chorin-?hnri et al. ......... 345,591 * cited by examiner (22) Filed: Dec. 27, 2007 O O Primary Examiner — Pankaj Kumar (65) Prior Publication Data Assistant Examiner — Reuben M Brown US 2009/O167955A1 Jul. 2, 2009 (74) Attorney, Agent, or Firm — Warren L. Franz; Wade J. Brady, III; Frederick J. Telecky, Jr. (51) Int. Cl. HO)4N 7/173 (2006.01) (57) ABSTRACT H04N 5/46 (2006.01) In one embodiment, an image decoding system for a YCC, G09GGO6K 5/009/OO (2006.01)2006.O1 formatted signal includes a color space converter capable of ( .01) representing an RGB image signal with one or two negative HO4N 9/64 (2006.01) image signal components. The image decoding system fur (52) U.S. C. ........ 348/661; 348/624; 348/557; 348/651: ther includes a degamma correction unit and an image signal 382/167 formatter. An offset of the image black level from Zero cor (58) Field of Classification Search .................. 348/649, responding to the image signal offset produced by the color 348/650, 557, 624, 708, 651,653, 661; 382/167; space converter is employed to perform degamma correction. 345f591,602,604 In a further embodiment, gain, offset, and sign are removed See application file for complete search history. from the image signal produced by the color space converter prior to degamma correction. The image signal formatter may (56) References Cited utilize a one-dimensional and a three-dimensional lookup table to produce an image signal that may include secondary U.S. PATENT DOCUMENTS and white image components. The system advantageously 5,528,296 A 6/1996 Gove et al. .................... 348,275 accommodates decoding XVYCC-encoded image data in con 5,677,741 A * 10/1997 Yui .............................. 348,649 5,726,682 A * 3/1998 Lumet al. ..................... 345 604 ventional as well as new hardware display system architec 5,784,050 A * 7/1998 Corry ............................ 345 604 tures. 6,215,913 B1 * 4/2001 Clatanoff et al. ............. 382,275 6,268,847 B1 * 7/2001 Glen ............................. 345 604 8 Claims, 4 Drawing Sheets GAIN, OFFSET, AND 1404 1406 U.S. Patent Apr. 2, 2013 Sheet 1 of 4 US 8.411.206 B2 Y 254 XVYCC 235 128 16 1 Cb ORC 1 16 128 240 254 FIG. 2 300 304 307 e.g., XWCC e.g., RGB SIGNALS EXPANDED SIGNALS DISPLAY DECODING UNIT SYSTEM U.S. Patent Apr. 2, 2013 Sheet 2 of 4 US 8.411.206 B2 310-N ILLUMINATION SYSTEM IMAGE PROCESSING UNIT EXPANDED OECOOING UNIT FIG. 4 304 COLOR SPACE DEGAMMA IMAGE SIGNAL CONVERTER UNIT FORMATTER 302 320 322 306 314 316 318 FIG. 5 304 314 ? RGB DATA Y HD/SD Cb CONVERSION OFFSET LIMITER C MATRIX UNIT wi 626 616 FIG. 6 U.S. Patent Apr. 2, 2013 Sheet 3 of 4 US 8.411.206 B2 701 OUTPUT 702 SIGNAL 703 O O INPUT SIGNAL FIG. 7 OUTPUT SIGNAL 0 INPUT SIGNAL FIG. IO R'G'B' DATA . - HD/SD s - CONVERSION OFFSETE LIMITER MATRIX UNIT 620 622 624 626 OFFSET, GAIN, AND SIGN CORRECTION PRE-PROCESSING U.S. Patent Apr. 2, 2013 Sheet 4 of 4 US 8.411.206 B2 OUTPUT SIGNAL 0 INPUT SIGNAL FIG. I.3 1404 1406 US 8,411,206 B2 1. 2 APPARATUS AND METHOD FOR DECODING Due to its Superiority over traditional encoding schemes EXTENDED COLOR SPACE DATA and standards, the XVYCC standard has rapidly become deployed in Systems utilizing high performance display TECHNICAL FIELD devices. With Such growing use, it has become imperative for image display systems to be capable of decoding image sig Embodiments of this invention relate generally to an appa nals in extended color spaces, such as that provided by the ratus and method for image signal processing, and more XVYCC color space, and/or be capable of handling negative particularly to image signal decoding methods and apparatus color components during a decoding process. capable of decoding image signals in extended color spaces. Thus, what is needed in the art is an image signal decoding 10 arrangement that overcomes these prior color-space limita BACKGROUND tions, including inability to handle signals representing nega tive color component excursions. In imaging applications, electronic images are generated by image generation systems such as digital video cameras SUMMARY OF THE INVENTION and scanners. The electronic images are delivered to and 15 reproduced by image display systems, such as television Embodiments achieve technical advantages as an image receivers, projectors, and other display devices. decoding system. In an advantageous embodiment, an image However, an image generated by an image generation sys decoding system includes a decoding process capable of tem generally cannot be directly displayed by an image dis decoding image signal components in extended color spaces, play system without further image processing because the Such as image signal components of an image signal encoded color spaces may not be the same for the two systems. Even in aYCC, format, and more particularly, capable of decoding when the color spaces are functionally the same, the image negative image signal components during the decoding pro produced by the image generation system may be in a data cess. In an advantageous embodiment, the image decoding format different from the data format required by the display 25 system includes a color space converter, a degamma unit, and system. This problem can be solved by converting the gener an image signal formatter. In an advantageous embodiment, ated image (i.e., the image data signals received by the image the image decoding system further includes an offset, gain, display system) into an image data format that is compatible and sign correction pre-processing unit operative before sig with the image data format of the color space of the display nal processing in the degamma unit. In an advantageous system. Such image data conversion is often referred to as 30 embodiment, the image decoding system is capable of decod data decoding, and the converted image data are often ing an input in image signal including an image signal com referred to as decoded image data. ponent with a black level offset from the origin of the image A number of techniques to represent a colored image with coordinate system. a signaling arrangement are presently known. For example, the RGB ("red-green-blue') color space is the signal arrange 35 BRIEF DESCRIPTION OF THE DRAWINGS ment that was originally developed for color CRTs (cathode ray tubes). To reproduce a color image in a display device For a more complete understanding of the embodiments, requires that the image be captured and encoded with a sig and the advantages thereof, reference is now made to the naling arrangement in an image source and then be decoded following descriptions taken in conjunction with the accom and reproduced in the display device. Most of the current 40 panying drawings, in which: techniques for decoding signals representing an image in a FIG. 1 illustrates a CIE 1931 XYZ, x-y chromaticity dia display device are operable, however, only for positive image gram representing all visible colors for a typical human eye, data during the decoding processes, which is not compatible and a more limited color rendition capability of a display with, and does not take advantage of the extended color system; spaces of recently developed high performance display 45 FIG. 2 illustrates the color gamut of an sRGB signal in the devices, such as DLP(R) display devices, which comprise ITU-R BT.709-2 standard, the color gamut of the syCC, DMD (“Digital Micrometer Device') display elements. standard, and the color gamut of the XVYCC standard; Following development of the RGB color-encoding sys FIG. 3 illustrates a schematic diagram of an advantageous tem, the YCC, color-encoding standard was developed to embodiment of an image signal decoding process; provide a family of color spaces which can be stored and 50 FIG. 4 illustrates a simplified schematic drawing of an transmitted with greater signaling efficiency than RGB color exemplary advantageous embodiment of a display system space signals. More recently, with a view toward providing including the decoding process illustrated in FIG.
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