Heat-sensitive infrared-light image sensor with circuitry for ca

Details Heat-sensitive infrared-light image sensor with circuitry for ca Heat-sensitive infrared-light image sensor with circuitry for ca

1996-12-16

1999-01-19

Chin, Tommy P.

Television

Responsive to nonvisible energy

Infrared

348247, 348244, H04N 533

Patent

active

058619135

ABSTRACT:
A heat-sensitive infrared-light image sensor is provided with an array of reference cells and video cells. During a setup (initialization) mode, video offset values are produced as representative of deviations of video samples from the video cells and stored in a memory. First reference offset values are produced as representative of deviations of reference samples from the reference cells and a first average value representing an average of the first reference offset values is derived and stored into a first register. During an operational mode, second reference offset values are produced as representative of deviations of reference samples from the reference cells, and a second average value representing an average of the second reference offset values is derived and stored into a second register. The first and second average values are read from the first and second registers and an amount of drift of operational characteristics of the image sensor from initial characteristics of the image sensor is determined from the read average values. The video offset values are read from the memory and modified with the determined amount of drift. Temperature-dependent drift components of video samples from the video cells are canceled out with the modified video offset values.

REFERENCES:
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patent: 4555732 (1985-11-01), Tuhro
patent: 4694334 (1987-09-01), Bucher et al.
patent: 5132801 (1992-07-01), Yamano
patent: 5291293 (1994-03-01), Kapan
patent: 5473660 (1995-12-01), Bastiaens et al.
patent: 5748803 (1998-05-01), Schielke

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