Image signal processing method and apparatus

Details Image signal processing method and apparatus Image signal processing method and apparatus

1981-10-30

1983-08-23

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, 358284, H04N 140

Patent

active

044007388

ABSTRACT:
A two stage image processing apparatus and method wherein, in a first stage, successive groups of image pixels are used to address a RAM based look up table to provide a preliminary breakdown between halftone and textural images. As a second stage, to further enhance the differentiation between halftone and textural images, the output of the RAM address table is employed to generate a count signal. Previous counts stored in a succession of counters are used to determine a new count, a predetermined number of which are summed as a block by an adder in response to the count signal. The is compared with a preset threshold to generate a control signal for operating a pixel generator. The new counts are used to update the counters, the count on the counter serving to represent prior pixel processing conditions.

REFERENCES:
patent: 3952144 (1976-04-01), Kolker
patent: 4194221 (1980-03-01), Stoffel
patent: 4196453 (1980-04-01), Warren
patent: 4205341 (1980-05-01), Mitsuya et al.
patent: 4342051 (1982-07-01), Suzuki et al.

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