Image analysis – Image compression or coding – Quantization
Patent
1996-06-04
1998-06-09
Kelley, Christopher S.
Image analysis
Image compression or coding
Quantization
382272, G06K 946
Patent
active
057648115
ABSTRACT:
An image processing apparatus 30, which can solve the problems of delay in dot generation in beginning portions of areas of low or high density and tailing after finishing areas of low or high density and carry out speedy binary coding image processing without accompanying side effects of quality depletion and without the need to utilize a complicated processing circuit: includes error correction means 34 which corrects multigradation image data 200 and outputs it, threshold error setting means which sets a binary coding threshold value based on the gradation value of said target pixel multigradation image data 200 and binary coding means 36 which, based on the set threshold value, converts the previously mentioned corrected pixel data into the previously mentioned bigradation image data and outputs it; the gradation value of the previously mentioned target pixel multigradation image data being data, the median value of the previously mentioned first gradation value and second gradation value being m and the previously mentioned threshold value being slsh, the previously mentioned threshold setting means, 36, when the gradation value of the previously mentioned target pixel multigradation image data is in the neighborhood of the previously mentioned first and second gradation values, the binary coding threshold value is set within the tolerance range shown in the following equations:
REFERENCES:
patent: 5045952 (1991-09-01), Eschbach
patent: 5208873 (1993-05-01), Nakajima
patent: 5268774 (1993-12-01), Eschbach
patent: 5307425 (1994-04-01), Otsuka
patent: 5325211 (1994-06-01), Eschbach
patent: 5325448 (1994-06-01), Katayama et al.
Patent Abstracts of Japan, vol. 13, No. 376 (M-862), Aug. 21, 1989, JP-A-01 130 945 (Canon Inc) May 23, 1989 *abstract*.
Patent Abstracts of Japan, vol. 16, No. 441 (E-1264), Sep. 14, 1992, JP-A-04 154 370 (fujitsu Ltd) May 27, 1992 *abstract*.
Kelley Christopher S.
Seiko Epson Corporation
LandOfFree
Image processing apparatus and computer readable medium for impl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image processing apparatus and computer readable medium for impl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image processing apparatus and computer readable medium for impl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2211193