Image analysis – Histogram processing – For setting a threshold
Patent
1989-02-24
1991-08-06
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 46, G06K 900
Patent
active
050383841
ABSTRACT:
An apparatus for reading information includes an original picture forming arrangement for converting a picture element signal of an object to a digital signal, and a word map forming arrangement for dividing the original image into rectangular sections that define a pattern contained in the original picture image for forming a word map, units of the word map being correlated with corresponding ones of the rectangular sections and coded to form a bit map. A first calculating arrangement is provided for distinguishing the pattern contained in the original picture image from the background, for determining an estimated inclination angle of the pattern contained in the original picture image. A second picture image forming arrangement rotates the pattern by an angle corresponding to the estimated inclination angle to form a second picture image, and a second calculating arrangement maps the second picture image in a horizontal direction and in a vertical direction to determine an inclination correcting angle required to substantially completely horizontally orient the pattern in the second picture image. A third picture image forming arrangement is provided for rotating the pattern contained in the second picture image by the inclination correcting angle to form a third picture image which has a corrected orientation of the pattern of the original picture image.
REFERENCES:
patent: 4450579 (1984-05-01), Nakashima et al.
patent: 4736437 (1988-04-01), Sacks et al.
Boudreau Leo H.
Nihon Taisanbin Kogyo Kabushiki Kaisha
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