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Showing papers on "Channel (digital image) published in 1971"


Journal ArticleDOI
TL;DR: In this paper, a channel electron multiplier plate has been used in an X-ray image intensifier to produce a full size distortion-free viewing system with sufficient image brightness to obviate the need for dark adaption.
Abstract: A channel electron multiplier plate has been used in an X-ray image intensifier to produce a full size distortion-free viewing system with sufficient image brightness to obviate the need for dark adaption. The useful diameter of the tube is 120 mm and the thickness is only a few centimeters. The characteristics of a channel plate are discussed and related to the requirements of an X-ray intensifier. Practical considerations such as field emission and gas desorption, which affect the design and performance of the tube, are also considered. The resolution capability is comparable with other X-ray image converters as it is primarily determined by the X-ray detecting layer. It is shown that the efficiency of this layer also determines the signal-to-noise ratio of the output picture and an expression is derived to show that a photocathode of only moderate sensitivity is adequate to reduce the effect of the exponential pulse height distribution of the channel plate output to negligible proportions. In addition to quantitative details of the tube performance a subjective assessment has been made relating the minimum visually perceptible detail with contrast for various X-ray dose rates.

10 citations


Patent
07 May 1971
TL;DR: In this paper, an image-transmitting device is made by bringing to get together SEVERAL SEPARATE OPTICAL FIBERS to form a flat tape, and then the length of the tape is split into separate lengths.
Abstract: AN IMAGE TRANSMITTING DEVICE IS MADE BY BRINGING TOGETHER SEVERAL SEPARATE OPTICAL FIBERS TO FORM A FLAT TAPE. THE TAPE IS CUT INTO SEPARATE LEGTHS AFTER THE FIBRES HAVE BEEN CAUSED TO ADHERE TO ONE ANOTHER. THE LENGTHS ARE STACKED AND THE ENDS AT LEAST OF THE STACKED TAPES BONDED TOGETHER. APPARATUS FOR MAKING THE IMAGE TRANSMITTING DEVICE INCORPORATES A DEVICE FOR BRINGING INDIVIDUAL FIBRES TOGETHER TO FORM A TAPE, MEANS FOR CUTTING THE TAPE INTO LENGTHS AND MEANS SUCH AS A CHANNEL IN WHICH THE CUT LENGTHS OF TAPE ARE STACKED.

5 citations


Patent
12 Jan 1971
TL;DR: In this paper, a solid state color killer circuit is used to disable the chrominance channel when monochrome signals are received. But the color signal processing is performed on the direct current potential of the circuit.
Abstract: A solid state color killer circuit which functions as a switching circuit to control a direct current potential which is applied to a stage in the chrominance channel to disable the chrominance channel when monochrome signals are received. When color signals are received, the color killer circuit shunts the direct current potential away from the chrominance channel to permit normal color signal processing. The circuit is adapted to provide a visual indication of the presence or absence of color signals.