Image processing device

Details Image processing device Image processing device

1993-11-16

1996-05-07

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358455, 358465, 358448, 358447, H04N 140

Patent

active

055151809

ABSTRACT:
The present invention is made to reduce the effect of variation of pulses for driving a printer when recording image data and to improve the gray level representation of picture images to be printed. Data incoming through an image reading device are quantized and processed two pixels at a time by a gray level image processing circuit. The two-pixels' data are first discriminated by an edge discriminator to determine whether they represent an edge portion within the image or not. An object image, on which an operation for inter-pixel spacing shall be conducted, is selected according to the discrimination result. The arithmetic and logic portion performs the above-mentioned operation by two pixels at a time if the data correspond to a non-edge portion and performs correction for enhancement if the data correspond to an edge. This may eliminate the effect of dot displacement due to variation of drive pulses of a printer and improve the quality, in particular, of a gray level image portion.

REFERENCES:
patent: 4638369 (1987-01-01), Hsieh
patent: 5144687 (1992-09-01), Honda
patent: 5299030 (1994-03-01), Kim

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