Sharpness emphasis signal processing

Details Sharpness emphasis signal processing Sharpness emphasis signal processing

1985-01-25

1987-06-02

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 80, 358166, H04N 140, H04N 514

Patent

active

046707930

ABSTRACT:
In forming a sharpness emphasis signal, accidental errors produced in digital processing of the image data of pixels in a matrix are cancelled by using look-up table memories to suppress the appearance of corresponding noises onto reproduction images. The invention further provides for use of a reduced number of bits in processing the data and particularly in processing sums of products used in the process, by providing for products to have substantially the same number of bits as the factors of the product.

REFERENCES:
patent: 4319268 (1982-03-01), Yamada
patent: 4335407 (1982-06-01), Atoji

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