Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-07-20
1984-09-25
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358228, 364414, 378 99, H04N 532
Patent
active
044738439
ABSTRACT:
An X-ray detector receives X-ray radiation from an object under examination and generates a detector image thereof. An image intensifier including a screen enhances the detector image and generates an image intensifier image which emits light. A video camera views the image intensifier image and generates a video signal comprised of frames of digital data. These data describe the signal levels of the image intensifier image. A display device connected to the camera receives the video signal and displays an image in accordance with the distribution of X-ray radiation. An iris is arranged between the image intensifier and the video camera. The iris has an aperture of variable size for controlling the intensity of light transmitted from the image intensifier to the video camera. A control circuit is provided for controlling the aperture of the iris. This control circuit comprises a first storage device receiving the video signal and storing digital data corresponding to one of the frames, a threshold device for determining the maximum signal level of the digital data contained in the stored frame, a second storage device sorting information about parameter values indicative of a plurality of aperture sizes and about maximum image signal levels corresponding to these sizes ("look-up" table), a device evaluating from the maximum signal level and from the information stored in the second storage device a desired parameter indicative of a desired size of the aperture, and a device for setting the actual size of the aperture, whereby the setting device is responsive to the desired parameter evaluated by the evaluating device.
REFERENCES:
patent: 4300167 (1981-11-01), Miller
patent: 4355331 (1982-10-01), Georges
G. S. Carrera et al, "Diagnostic Imaging" Nov. 1981, pp. 66 and 67.
Bishop Marc D.
Lucchesi Oreste J.
Britton Howard W.
Milde Jr. Karl F.
Siemens Gammasonics Inc.
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