Image analysis – Image segmentation
Reexamination Certificate
2008-09-09
2008-09-09
Bali, Vikkram (Department: 2624)
Image analysis
Image segmentation
C382S224000, C375S240200
Reexamination Certificate
active
10861310
ABSTRACT:
A system and method for classifying an image block of a printed image into contone, halftone, or error diffusion classes, includes scanning the printed image; selecting an n by n block of pixels from the scanned image in a luminance channel; calculating an array of DCT coefficients of the pixel block, wherein the calculated DCT coefficients are representative of spatial frequency and spatial orientation of the pixel block; comparing the array of DCT coefficients with an array of predetermined values, wherein the array of predetermined values are indicative of contone, halftone and error diffusion classes; and determining the image classification of the pixel block based on the comparison of the DCT coefficients with the array of predetermined values. If the image is determined to be halftone, then the method further evaluates the DCT coefficients to determine the frequency of the halftone screen.
REFERENCES:
patent: 4672441 (1987-06-01), Hoelzlwimmer et al.
patent: 5128757 (1992-07-01), Citta et al.
patent: 5187755 (1993-02-01), Aragaki
patent: 5341226 (1994-08-01), Shiau
patent: 5416613 (1995-05-01), Rolleston et al.
patent: 5687303 (1997-11-01), Motamed et al.
patent: 5760913 (1998-06-01), Falk
patent: 5765029 (1998-06-01), Schweid et al.
patent: 5778092 (1998-07-01), MacLeod et al.
patent: 5850474 (1998-12-01), Fan et al.
patent: 5854857 (1998-12-01), de Queiroz et al.
patent: 5867593 (1999-02-01), Fukuda et al.
patent: 5907362 (1999-05-01), Yamamoto
patent: 6031618 (2000-02-01), Wang
patent: 6069973 (2000-05-01), Lin et al.
patent: 6091767 (2000-07-01), Westerman
patent: 6141120 (2000-10-01), Falk
patent: 6175650 (2001-01-01), Sindhu et al.
patent: 6181829 (2001-01-01), Clark et al.
patent: 6252994 (2001-06-01), Nafarieh
patent: 6307962 (2001-10-01), Parker et al.
patent: 6353675 (2002-03-01), Sharma
patent: 6493387 (2002-12-01), Shin et al.
patent: 2002/0076103 (2002-06-01), Lin et al.
patent: 2003/0072487 (2003-04-01), Fan et al.
U.S. Appl. No. 10/604,200, filed Jun. 30, 2003, Reiner Eschbach et al.
U.S. Appl. No. 10/604,201, filed Jun. 30, 2003, Gaurav Sharma et al.
Xerox, filed Jun. 4, 2004, Shen-ge Wang, et al.
Gaurav Sharma, Shen-Ge Wang, Deepthi Sidavanahalli, Keith Knox, “The Impact of UCR on Scanner Calibration”, Proc. IS&T's 1998 PICS Conference, pp. 121-124.
Lin Ying-Wei
Wang Shen-Ge
Xu Beilei
Bali Vikkram
Rashid David P
Walder Jeannette
Xerox Corporation
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