Method for reducing a binary image

Details Method for reducing a binary image Method for reducing a binary image

1984-10-24

1987-04-07

Ciarlante, Anthony V.

Image analysis

Histogram processing

For setting a threshold

G06K 942

Patent

active

046566643

ABSTRACT:
The method of the present invention reduces a binary digital image in size by a factor F by a method including the steps of: storing the image in bit sequence; removing one or more rows of bits along the vertical axis of the image to convert i rows of bits to j rows of bits where 0.5i.ltoreq.j<i; modifying a line adjacent to each line discarded to preserve selected information from the discarded line; repeating the steps of removing and modifying a predetermined number of times to achieve a reduction by a factor F1 along the vertical axis; rotating the image in a first direction by ninety degrees; removing one or more rows of bits along the original horizontal axis of the image to convert i rows of bits to j rows of bits where 0.5i.ltoreq.j<i; modifying a line adjacent to each line discarded to preserve selected information from the discarded line; repeating the steps of removing and modifying a predetermined number of times to achieve a reduction by a factor F2 along the original horizontal axis; rotating the image back to its original orientation; storing the reduced size image generated by the above steps.

REFERENCES:
patent: 3976982 (1976-08-01), Eiselen
patent: 4280143 (1981-07-01), Judd
patent: 4303948 (1981-12-01), Arai et al.
patent: 4435703 (1984-03-01), Hunt et al.

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