Image processing device for resolution conversion

Details Image processing device for resolution conversion Image processing device for resolution conversion

1993-03-17

1995-05-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358453, 358455, 358447, 382298, H04N 1393

Patent

active

054186269

ABSTRACT:
An image processing device for effecting resolution conversion includes an image signal memory (1) for storing the input pixel levels I.sub.xy, and an enlargement/reduction calculator circuit (2) for calculating a grey level G.sub.XY of each output pixel corresponding to the average of the areas of input pixel intersecting with the output pixel. The error occurring upon quantization by a quantizer (4) is calculated by an error calculator (5), and, after being delayed by one pixel by an error memory (6), is fed back to a image signal compensator circuit (3) to be added to the grey level S3 to obtain the compensated gray level S4, which is quantized by the quantizer (4) to obtain the quantized level O.sub.XY.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4484347 (1984-11-01), Kashioka
patent: 4930021 (1990-05-01), Okada
patent: 5010497 (1991-04-01), Shimata
patent: 5125045 (1992-06-01), Murakami et al.
patent: 5131059 (1992-07-01), Kobayashi et al.
patent: 5153749 (1992-10-01), Katayama
patent: 5200839 (1993-04-01), Uchizono
patent: 5251046 (1993-10-01), Kato et al.
Xerox Disclosure Journal "A Density Preserving Digital Image Magnifier/Reducer" Jerry L. Potter, Dec. 1979.
IEEE Transactions on Communications "Survey of Electrohnic Techniques for Pictorial Image Reproduction" Stoffel & Moreland, 1981.
H. Morita, et al "Rapid Pixel Density Conversion Based on the Projection Method" Proceedings of the Image & Electronics Engin.

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