Quadrant-based density detection for lead edge lightening

Details Quadrant-based density detection for lead edge lightening Quadrant-based density detection for lead edge lightening

1996-12-17

1998-09-01

Rogers, Scott

Image analysis

Image enhancement or restoration

Object boundary expansion or contraction

358452, 358300, 399187, G06K 944, G03G 1500, G03G 2100, H04N 1387

Patent

active

058022155

ABSTRACT:
A lead edge lightening circuit which will lighten a scan line based on a seven by seven pixel area surrounding the current pixel. The area is divided into four sub-areas, each of four by four pixels, and each having the current pixel at one corner. Each sub-area is summed and compared to a threshold number. If the threshold number is equalled or exceeded by at least one of the four sums, an overlay bit, which can be white or black, is output. The current pixel is replaced by a white pixel if a white pixel has been output, otherwise the current pixel remains unchanged.

REFERENCES:
patent: 3834807 (1974-09-01), Fuller et al.
patent: 4743947 (1988-05-01), Yamamoto
patent: 4945386 (1990-07-01), Ito et al.
patent: 4972209 (1990-11-01), Tanigawa
patent: 5200837 (1993-04-01), Sakurai
patent: 5333039 (1994-07-01), Sagara

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