Radiological installation using a camera television with low-rem

Details Radiological installation using a camera television with low-rem Radiological installation using a camera television with low-rem

1987-09-11

1989-07-11

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358111, 35821328, 378 99, H04N 718, H04N 532

Patent

active

048476862

ABSTRACT:
An imaging installation, especially for digital type radiology, comprises a pick-up tube television camera with no remanence or low remanence with a non-linear element producing a remanence of the image signal given by the camera. The remanence varies with the level of the signal. When a recursive filter is used to obtain this remanence which is variable with the signal level, the modulation f.sub.2, introduced by the modulator connected to the output of this filter by a frames memory, is defined by the function: f.sub.2 (x)=x[.lambda.(1-g(x))+.mu.g(x)],
a formula in which x is the ratio between the signal applied at the input of this modulator and the maximum value of the input signal, .lambda. and .mu. are constants, and g (x) is a linear function of x meeting the conditions: g (0) and g (1)=1.

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