Video image quality

Details Video image quality Video image quality

2004-10-21

2009-06-02

Do, Anh Hong (Department: 2624)

Image analysis

Color image processing

Color correction

C382S166000, C382S164000, C382S274000

Reexamination Certificate

active

07542600

ABSTRACT:
Video image quality may be improved by correcting exposure levels and/or enhancing contrast amounts on each frame. One or more of the following phases may be implemented: skin-color model building, face detecting, exposure level correcting, and contrast enhancing. In a described implementation, a Gaussian skin-color model is built for each image frame during runtime. The Gaussian skin-color model is built with training pixels that are selected responsive to a defined skin color range, which is created offline from manually-selected skin pixels of multiple test sequences. In another described implementation, each pixel of an image frame is re-exposed using a ratio of contrast amount control variables (CACVs). More specifically, a pixel may be converted to a corresponding light intensity using a first CACV, and the corresponding light intensity may be reconverted to a pixel using a second CACV to enhance the contrast and possibly reduce fuzziness of the image frame.

REFERENCES:
patent: 3988602 (1976-10-01), Gorsica, Jr.
patent: 5267331 (1993-11-01), Siwoff
patent: 5359675 (1994-10-01), Siwoff
patent: 6580824 (2003-06-01), Deng et al.
patent: 6631206 (2003-10-01), Cheng et al.
patent: 6798921 (2004-09-01), Kinjo
patent: 6940545 (2005-09-01), Ray et al.
patent: 7043474 (2006-05-01), Mojsilovic et al.
patent: 7376270 (2008-05-01), Chen et al.
patent: 2001309195 (2001-11-01), None
patent: 02004054960 (2004-02-01), None
Shi et al., “Automatic Image Quality Improvement for Videoconferencing”, IEEE, vol. 3, May 2004, pp. III-701 to III-704.
Messina et al., “Image Quality Improvement by Adaptive Exposure Correction techniques”, IEEE, vol. 1, Jul. 2003, pp. I-549 to I-552.
Bhukhanwala et al., “Automated Global Enhancement of Digitized Photographs” IEEE Trans. On Consumer Electronics vol. 40 No. 1 Feb. 1994 pp. 1-10.
Jones et al., “Statistical color models with application to skin detection” IEEE Proc. of CVPR Jun. 1999 pp. 274-280.
Messina et al., “Image Quality Improvement by Adaptive Exposure Correction Techniques” Proc. of ICME Jul. 2003 pp. 549-552.
Saitoh F., “Image Contrast Enhancement Using Genetic Algorithm” Proc. of IEEE International Conference on SMC Oct. 1999 vol. 4 pp. 899-904.
Soriano et al., “Adaptive skin color modeling using the skin locus for selecting training pixels” Pattern Recognition 36 2003 pp. 681-690.
Starck et al., “Gray and Color Image Contrast Enhancement by the Curvelet Transform” IEEE Trans. on Image Processing vol. 12 No. 6 Jun. 2003 pp. 706-717.
Yang et al., “Detecting human faces in color images” Proc. of ICIP Oct. 1998 pp. 127-130.

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