Image signal correcting circuit

Details Image signal correcting circuit Image signal correcting circuit

1986-12-03

1988-10-25

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358 98, H04N 514

Patent

active

047807628

ABSTRACT:
Picture quality is improved by reducing an influence such as an illumination unevenness caused on the low band side by providing an image signal correcting device comprising a logarithmic compressing device for logarithmically compressing an image signal, a two-dimensional filter device of a characteristic of suppressing the low band side and relatively enhancing the high band side of this logarithmically compressed image signal and an exponential converting device for converting the image signal having passed through this two-dimensional filter to be of an exponential characteristic.

REFERENCES:
Riolfo, Benedetto, "Techniques for Two-Level Coding of T.V. Signals" CSELT Rapporti Technici, vol. VIII, No. 2, pp. 131-138, 1979.

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