Importance

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Abstract

A binary image reduction method for reducing a binary original picture at a conversion ratio .alpha..sub.x smaller than 1 in a horizontal direction and at a conversion ratio .alpha..sub.y smaller than 1 in a vertical direction to obtain a converted picture, x satisfying 1/nx>.alpha..sub.x .gtoreq.1/(n.sub.x +1) y satisfying 1/n.sub.y >.alpha..sub.y .gtoreq.1/(n.sub.y +1) where n.sub.x and n.sub.y are natural numbers, The method being composed of the steps of: obtaining a positional relationship between a target of converted pixels of the converted picture and original pixels on the original picture, forming a rectangular area on the original picture having a side of 2(n.sub.x +1) original pixels in the horizontal direction and a side of 2(n.sub.y +1) original pixels in the vertical direction such that the position of the target of a converted pixel occupies a central position of the rectangular area; detecting the presence/absence of a line segment having a predetermined width and a predetermined length in the rectangular area using some or all of 4(n.sub.x +1) original pixels in the rectangular area; and assigning values of pixels of the line segment as the values of the targets of converted pixels when the line segment is present in the rectangular area and the targets of converted pixels are each the converted pixel closest to the detected line segment.

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First Claim