| US 7,447,355 B2 | ||
| Method for defining chromaticity regions according to luminance levels and adjusting chromaticity of images accordingly | ||
| Tsung-Ming Wang, Hsinchu (Taiwan); Hsi-Chun Huang, Hsinchu (Taiwan); and Chao-Chee Ku, Hsinchu (Taiwan) | ||
| Assigned to Weltrend Semiconductor Inc., Hsinchu (Taiwan) | ||
| Filed on May 16, 2005, as Appl. No. 10/908,511. | ||
| Claims priority of application No. 94105619 A (TW), filed on Feb. 24, 2005. | ||
| Prior Publication US 2006/0188152 A1, Aug. 24, 2006 | ||
| Int. Cl. G06K 9/00 (2006.01); G09G 5/02 (2006.01); G03F 3/08 (2006.01) | ||
| U.S. Cl. 382—167 [345/589; 358/518] | 30 Claims |
| 1. A method for defining a plurality of chromaticity regions according to luminance levels and adjusting chromaticity of images
accordingly, the method comprising the steps of:
(a) defining a plurality of chromaticity regions according to a variety of luminance levels; and
(b) multiplying an original chromaticity vector of a pixel with an adjusting factor to form an adjusted chromaticity vector,
the original chromaticity vector of the pixel corresponding to one of the chromaticity regions set in step (a), which corresponds
to a luminance level of the pixel,
wherein the chromaticity regions comprise a first chromaticity region corresponding to a first luminance level larger than
60 but not larger than 175, a pixel having a chromaticity vector within the first chromaticity region having a first chromaticity
component and a second chromaticity component conforming to the following constraints: 2*Cb−3*Cr<−64, 2*Cb−3*Cr>−288, Cb+Cr>−12, and 2*Cb+Cr<24, where Cb is the first chromaticity component and Cr the second chromaticity component.
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