The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1989
Filed:
Sep. 11, 1987
Jean L Ploix, Issy Les Moulineaux, FR;
Thomson-CGR, Paris, FR;
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.