Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-04-25
1976-05-18
Safourek, Benedict V.
Telegraphy
Systems
Simplex-reversing periodic
178 6, 178DIG36, H04N 718, G06M 1102
Patent
active
039580792
ABSTRACT:
A device is provided for improving the vertical resolution in a television-based, two-dimensional readout for radiation detection systems such as are used to determine the location of light or nuclear radiation impinging a target area viewed by a television camera, where it is desired to store the data indicative of the centroid location of such images. In the example embodiment, impinging nuclear radiation detected in the form of a scintillation occurring in a crystal is stored as a charge image on a television camera tube target. The target is scanned in a raster and the image position is stored according to a corresponding vertical scan number and horizontal position number along the scan. To determine the centroid location of an image that may overlap a number of horizontal scan lines along the vertical axis of the raster, digital logic circuits are provided with at least four series-connected shift registers, each having 512 bit positions according to a selected 512 horizontal increment of resolutions along a scan line. The registers are shifted by clock pulses at a rate of 512 pulses per scan line. When an image or portion thereof is detected along a scan, its horizontal center location is determined and the present front bit is set in the first shift register and shifted through the registers one at a time for each horizontal scan. Each register is compared bit-by-bit with the preceding register to detect coincident set bit positions until the last scan line detecting a portion of the image is determined. Depending on the number of shift registers through which the first detection of the image is shifted, circuitry is provided to store the vertical center position of the event according to the number of shift registers through which the first detection of the event is shifted. Interpolation circuitry is provided to determine if the event centroid is between adjacent scan lines and stored in a vertical address accordingly. The horizontal location of the event is stored in a separate address memory.
REFERENCES:
patent: 3551052 (1970-12-01), Reiber
patent: 3740468 (1973-06-01), Gardner
patent: 3780223 (1973-12-01), Perry
patent: 3814845 (1974-06-01), Hurlbrink et al.
Case Arthur L.
Davidson Jackson B.
Breeden David E.
Carlson Dean E.
Coles Edward L.
Safourek Benedict V.
The United States of America as represented by the United States
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