Method and apparatus for linearly filtering two-dimensional sign

Details Method and apparatus for linearly filtering two-dimensional sign Method and apparatus for linearly filtering two-dimensional sign

1976-12-30

1978-06-27

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

324 77K, 358166, 358253, H04N 521, H04N 572

Patent

active

040978982

ABSTRACT:
A method of linearly filtering spatially two-dimensional signals. The signal to be filtered is applied to an electronic imaging system. For providing a scanning movement, the signal is deflected in the electronic imaging system and swept over at least one mask in which a desired corrective filter function is established in the form of a specific transmission characteristic. The light passed by the mask is detected by means of at least one photodetector placed behind the mask. The output signal of the photodetector is a representation of the filtered two-dimensional signal as a function of the time.

REFERENCES:
patent: 2205504 (1940-06-01), Urtel
patent: 2905757 (1959-09-01), James
patent: 3149968 (1964-09-01), Stephens
patent: 3288240 (1968-06-01), Robbins
patent: 3609235 (1969-10-01), Sawyer
patent: 3987243 (1976-10-01), Schwartz

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