Noise reduction in digital fluoroscopy systems

Details Noise reduction in digital fluoroscopy systems Noise reduction in digital fluoroscopy systems

1981-04-24

1983-01-04

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358111, 378 99, H04N 521

Patent

active

043674909

ABSTRACT:
Apparatus for reducing the effect of x-ray statistical noise and electronic noise in a fluorographic system that displays an x-ray image on a television screen. Analog video signals based on the x-ray image are amplified logarithmically and digitized to yield live pixel signals. Processed pixel signals are averaged in a full image store or memory. Motion is detected by subtracting the stored pixels from the live pixels on a pixel-by-pixel basis in an ALU. The difference resulting from subtraction is used as part of an address to a look-up table (LUT) which contains values equivalent to the difference signals times a noise reduction multiplicative factor, K. The other part of the addresses is the live pixel value. There are several replications of the look-up tables each relating to a particular brightness level range. The one selected is determined by the live signal part of the address which relates to brightness. The K times the difference signals in the ranges are chosen so the amount of noise reduction varies with brightness level as desired for logarithmic signals. The pixels processed as explained above are added in-phase with the stored and averaged pixels and returned to the corresponding full image memory locations.

REFERENCES:
patent: 4246610 (1981-01-01), Takahashi
patent: 4296436 (1981-10-01), Achida

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