Magnification ratio conversion in image reproduction

Details Magnification ratio conversion in image reproduction Magnification ratio conversion in image reproduction

1985-03-27

1987-07-21

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 77, 382 47, H04N 104

Patent

active

046822437

ABSTRACT:
In reproducing images in a desired magnification ratio by storing in a memory image data obtained from an original and reading out the data from the memory, moire patterns are reduced by a sampling frequency constant in accordance with a magnification ratio that yields good reproduction quality. Image data synchronized with the sampling frequency are averaged among a number of pixels corresponding to the desired magnification ratio, for storage.

REFERENCES:
patent: 4163605 (1979-08-01), Yamada
patent: 4305093 (1981-12-01), Nasu
patent: 4327380 (1982-04-01), Yamada et al.
patent: 4454537 (1984-06-01), Okada et al.
patent: 4470074 (1984-09-01), Yamada
patent: 4521812 (1985-06-01), Knop
patent: 4605957 (1986-08-01), Yamada

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