Method and apparatus for sub-pixel centroiding of a photon event

Details Method and apparatus for sub-pixel centroiding of a photon event Method and apparatus for sub-pixel centroiding of a photon event

1988-12-23

1990-12-18

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

2502061, 358103, 382 27, 382 48, G06K 900

Patent

active

049792210

ABSTRACT:
A photon signal received on a CCD is digitized and coupled to a 3.times.3 pixels data analysis array (DAA). The digital signals read out from the penultimate three pixels of the DAA are used to address a first look up table held in a memory, the digital signals read out from the last three pixels of the DAA are used to address a second look up table held in a memory. The data stored at the two addressed locations are then read out and logically ANDed to produce an output signal only when both ANDed data correspond to a valid photon event. The output signal thus defines the position of the center of the photon signal at a high level of precision.

REFERENCES:
patent: 3120578 (1964-02-01), Potter et al.
patent: 4330705 (1982-05-01), Kollodge
patent: 4499597 (1985-02-01), Alues
patent: 4625330 (1986-11-01), Higgins
patent: 4658431 (1987-04-01), Yokota
patent: 4805226 (1989-02-01), Guebey

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