Adaptive directional edge-preserving false contour filtering

Details Adaptive directional edge-preserving false contour filtering Adaptive directional edge-preserving false contour filtering

2006-01-12

2010-06-29

Werner, Brian P (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C382S264000, C382S269000, C345S611000

Reexamination Certificate

active

07747100

ABSTRACT:
A method for adaptive false contour reduction includes: detecting contour location information by removing a flat region having certain brightness values from a first input image based on a bright value difference between the first input image and a second input image with a bit depth of the first input image reduced; detecting false-contour direction and location information by measuring directional contrast of the flat region-removed first image, and distinguishing the false contour area and an edge area out of the false contour location information based on the measured contrast; and smoothing the false contour area by using the false contour direction and location information, and removing the false contour from the first input image. Thus, a flat region can be automatically removed by using a brightness value difference between a bit depth-reduced image and an original input image and detect a false contour, thereby enhancing a precision degree of false contour detection. Further, signal components can be prevented from being degraded by performing smoothing over only a false contour.

REFERENCES:
patent: 4366507 (1982-12-01), Mori
patent: 4561022 (1985-12-01), Bayer
patent: 5025478 (1991-06-01), Morris et al.
patent: 5343309 (1994-08-01), Roetling
patent: 5920356 (1999-07-01), Gupta et al.
patent: 6094508 (2000-07-01), Acharya et al.
patent: 6414657 (2002-07-01), Kasahara et al.
patent: 6707952 (2004-03-01), Tan et al.
patent: 6941016 (2005-09-01), Wagman et al.
patent: 2005/0207492 (2005-09-01), Pao
patent: 06-225179 (1994-08-01), None
patent: 2003-015587 (2003-01-01), None
patent: 2003-304400 (2003-10-01), None
patent: 10-2004-0072070 (2004-08-01), None
Lee, J.W., et al. (Feb. 2006) “Two-stage false contour detection using directional contrast features and its application to adaptive false contour reduction.” IEEE Trans. on Consumer Electronics, vol. 52 No. 1, pp. 179-188.
Song, W-J., et al. (Aug. 1988) “Edge-preserving noise filtering based on adaptive windowing.” IEEE Trans. on Circuits and Systems, vol. 35 No. 8, pp. 1048-1055.
Joy, G. et al. (Mar. 1996) “Reducing false contours in quantized color images.” Computers and Graphics: Techniques for Virtual Environments, vol. 20 No. 2, pp. 231-242.
ISO/IEC Standard 14496-2:2001(E). (Dec. 2001) “Information technology—coding of audio-visual objects—part 2: visual.”.
Moravec, H.P. (Jul. 1983) “The Stanford Cart and the CMU Rover,” Proc. of the IEEE, vol. 71 No. 7, pp. 872-884.
Daly et al. (Jun. 2004) “Decontouring: prevention and removal of false color artifacts.” SPIE vol. 5292, pp. 130-149.

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