Image processing apparatus with high- and low-resolution image s

Details Image processing apparatus with high- and low-resolution image s Image processing apparatus with high- and low-resolution image s

1985-06-18

1988-11-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, 358284, H04N 140

Patent

active

047823992

ABSTRACT:
An image processing apparatus has image input systems for inputting image data at high and low resolutions, a high pass filter for filtering the low-resolution image data, an image property discrimination processor for discriminating an edge in the high-pass filtered low-resolution image data, and a signal selection circuit for selecting the image of high or low resolution in accordance with the discrimination result of the discrimination processor. The apparatus processes image signals so as to reproduce optimum quality images for all types of original images including character and halftone images.

REFERENCES:
patent: 4004079 (1977-01-01), Boston
patent: 4194221 (1980-03-01), Stoffel
patent: 4288821 (1981-09-01), Lavallee et al.
patent: 4403257 (1983-09-01), Hsieh
patent: 4554593 (1985-11-01), Fox et al.
patent: 4577235 (1986-03-01), Kannapell et al.
H. R. Schindler et al., "Optical Scanning of Continuous-Tone and Line Documents With Spatial Frequency Separation for Improved Data Handling and Compaction", IBM Technical Disclosure Bulletin, vol. 20, No. 12, May 1978, pp. 5416-5421.
Tomory, Ronald S., "Halftone Detection Using Transition Counter", Xerox Disclosure Journal, vol. 5, No. 6, Nov./Dec. 1980, p. 643.

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