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Title: Real time, TV-based, point-image quantizer and sorter

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 determinedmore » 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.« less

Inventors:
 [1];  [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
862548
Patent Number(s):
3958079
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01T - MEASUREMENT OF NUCLEAR OR X-RADIATION
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
time; tv-based; point-image; quantizer; sorter; device; provided; improving; vertical; resolution; television-based; two-dimensional; readout; radiation; detection; systems; determine; location; light; nuclear; impinging; target; viewed; television; camera; desired; store; data; indicative; centroid; images; example; embodiment; detected; form; scintillation; occurring; crystal; stored; charge; image; tube; scanned; raster; position; according; corresponding; scan; horizontal; overlap; lines; axis; digital; logic; circuits; series-connected; shift; registers; 512; bit; positions; selected; increment; resolutions; line; shifted; clock; pulses; rate; portion; center; determined; front; set; register; compared; bit-by-bit; preceding; detect; coincident; detecting; depending; circuitry; event; interpolation; adjacent; address; accordingly; separate; memory; camera tube; center position; detection systems; clock pulse; logic circuits; television camera; nuclear radiation; vertical axis; radiation detection; horizontal position; clock pulses; digital logic; logic circuit; radiation impinging; scan line; vertical resolution; shift register; radiation detected; data indicative; image position; horizontal center; /348/

Citation Formats

Case, Arthur L, and Davidson, Jackson B. Real time, TV-based, point-image quantizer and sorter. United States: N. p., 1976. Web.
Case, Arthur L, & Davidson, Jackson B. Real time, TV-based, point-image quantizer and sorter. United States.
Case, Arthur L, and Davidson, Jackson B. Thu . "Real time, TV-based, point-image quantizer and sorter". United States. https://www.osti.gov/servlets/purl/862548.
@article{osti_862548,
title = {Real time, TV-based, point-image quantizer and sorter},
author = {Case, Arthur L and Davidson, Jackson B},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {1}
}

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