Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Reexamination Certificate
2005-02-16
2009-11-24
Kim, Charles (Department: 2624)
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
C382S172000
Reexamination Certificate
active
07623727
ABSTRACT:
In a digital camera, a CPU divides a multi-valued image into blocks and selects object blocks, which are to be the object of processing. A CCD outputs luminance values of the multi-valued image. A low luminance threshold value setter sets low luminance threshold values on the basis of mean luminance values of blocks adjacent to the object block. A mean luminance value calculator calculates mean luminance values using luminance values from which luminance values that do not reach the low luminance threshold value in a block have been removed. A binarization threshold value setting circuit sets a binarization threshold value of the block based on the mean luminance values. A binarizer then binarizes the multi-valued image in the block on the basis of the binarization threshold values.
REFERENCES:
patent: 4578711 (1986-03-01), White et al.
patent: 4599656 (1986-07-01), Bellinghausen
patent: 4667250 (1987-05-01), Murai
patent: 4760464 (1988-07-01), Sakano
patent: 5268773 (1993-12-01), Park et al.
patent: 5313533 (1994-05-01), Scott
patent: 5450163 (1995-09-01), Iwasaki
patent: 5469267 (1995-11-01), Wang
patent: 5583659 (1996-12-01), Lee et al.
patent: 5617484 (1997-04-01), Wada et al.
patent: 5768441 (1998-06-01), Yoshizawa et al.
patent: 5796876 (1998-08-01), Wang et al.
patent: 5838838 (1998-11-01), Overton
patent: 5920655 (1999-07-01), Makita et al.
patent: 2001/0035975 (2001-11-01), Ishii
patent: 63-95779 (1988-04-01), None
patent: 64-51586 (1989-02-01), None
patent: 3-237571 (1991-10-01), None
patent: 4-92982 (1992-03-01), None
patent: 7-212591 (1995-08-01), None
Zhao et al, “Binary character/graphics image extraction: a new technique and six evaluation aspects”, 11th IAPR International Conference on Pattern Recognition, Sep. 1992.
Sadao Takahashi, “Thresholding Technique for Document Images from Digital Camera,” Research and Development Center, Ricoh Co., Ltd.
Kim Charles
Koziol Stephen R
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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