Image processing apparatus using recursive filters

Details Image processing apparatus using recursive filters Image processing apparatus using recursive filters

1992-05-15

1994-03-22

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

378 9812, H05G 164

Patent

active

052969371

ABSTRACT:
In a diagnostic X-ray apparatus, an image signal output from a TV camera connected to an image intensifier tube is supplied to a noise reducer through an A/D converter. The noise reducer comprises a first recursive filter for adding a value which is (1-a) times the input to the noise reducer and a value which is a times an output of the first recursive filter (a factor a is fixed to a value close to 1), a second recursive filter for adding a value which is (1-k) times the output of said fluoroscopy means and a value which is k times the output of the first recursive filter, a subtracter for subtracting the output of the second recursive filter from the input to the noise filter for every pixel, and a factor table for setting the factor k of the second recursive filter in accordance with the difference obtained by the subtracter such that the factor k and the difference have an inverse proportional relationship if the difference has a positive value.

REFERENCES:
patent: 4677478 (1987-06-01), Kruger et al.
patent: 5016104 (1991-05-01), Lim
patent: 5018179 (1991-05-01), Kaneko
patent: 5051842 (1991-09-01), Shimazaki

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