Image enhancement circuit

Details Image enhancement circuit Image enhancement circuit

1986-06-27

1987-10-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358284, 358167, 382 54, H04N 514, H04N 5213

Patent

active

047002298

ABSTRACT:
An image enhancement circuit for eliminating noise from a series of image signals g.sub.i (t) representing images of a quasi-stationary object in a noisy environment. The image enhancement circuit is provided with an accumulator circuit and a weighting circuit. The weighting circuit receives a difference signal indicating the difference between the actual image signal g.sub.i (n) and the output signal h.sub.i (n) of the accumulator circuit. In the weighting circuit, the difference signal is multiplied by a weighting factor k(i) which is dependent on the ordinal number i of the actual image signal g.sub.i (n). For example, k(i)=1/i. The weighted difference signal is then added to the accumulator.

REFERENCES:
patent: 4058836 (1977-11-01), Drewery et al.
patent: 4607284 (1986-08-01), Raven et al.
Bruggemann, Harro.,"Temporal Filtering Using Pixel Incrementing." J. Soc. Motion Picture and Television Engineers, pp. 686-694 (Aug., 1981).
Pratt, W. K., Digital Image Processing. John Wiley and Sons, pp. 434-437 (1978).

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