Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1996-02-07
1999-07-06
Moore, David K.
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
382270, G06K 936
Patent
active
059206551
ABSTRACT:
An appropriate binarization threshold can be automatically set between the object density and the background density in a multi-level input image, by determining the frequencies of the luminance levels of the entire image, then calculating the average and deviation of the frequencies, then specifying a region containing the optimum threshold for separating the object and the background in the image, by judging the magnitude of the deviation, and taking the average luminance of the specified region as the binarization threshold. Also in processing an image containing objects of three or more luminance levels, highly precise binarization according to the luminance hierarchy allows exact separation of the image regions, enabling precise character recognition process according to the hierarchic luminance levels.
REFERENCES:
patent: 4701807 (1987-10-01), Ogino
patent: 4918543 (1990-04-01), Petilli
patent: 5091963 (1992-02-01), Litt et al.
patent: 5097520 (1992-03-01), Bessho et al.
patent: 5130819 (1992-07-01), Ohta
patent: 5251046 (1993-10-01), Kato et al.
patent: 5363219 (1994-11-01), Yoshida
patent: 5452107 (1995-09-01), Koike
Makita Takeshi
Mori Hiroshi
Yamada Osamu
Brinich Stephen
Canon Kabushiki Kaisha
Moore David K.
LandOfFree
Binarization image processing for multi-level image data does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Binarization image processing for multi-level image data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Binarization image processing for multi-level image data will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-905419