Method of and apparatus for generating high-resolution binary im

Details Method of and apparatus for generating high-resolution binary im Method of and apparatus for generating high-resolution binary im

1987-02-26

1988-06-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358282, H04N 140

Patent

active

047515856

ABSTRACT:
An image data extracting circuit extracts multi-gradation image data obtained by reading a binary original by prescribed image regions about a pixel to be processed and latches the same. A linear edge detecting circuit detects a pixel to be processed corresponding to a linear edge portion of the original that is in conformity to the scanning direction by mutually comparing the gradients of the respective latched pixels. The circuit outputs a signal expressing linear edge patterns thereof and a signal expressing the gradient, i.e., density thereof. A second high-resolving circuit receives the signals to generate high-resolution binary image data forming a smooth linear edge having a resolution higher than the read resolution with an average density in response to the gradient of the pixel to be processed.

REFERENCES:
patent: 4237495 (1980-12-01), Yamamoto
patent: 4280144 (1981-07-01), Bacon
patent: 4570186 (1986-02-01), Kurata
patent: 4577235 (1986-03-01), Kannapell
patent: 4626902 (1986-12-01), Yamada

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