Integrated sensor and processor for visual images

Details Integrated sensor and processor for visual images Integrated sensor and processor for visual images

1987-11-09

1988-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

307328, H01J 4014, H02H 0000

Patent

active

047868180

ABSTRACT:
An integrated sensor and analog processor for visual images is produced from an array of photoreceptor signals that are the space-time derivative of the photoreceptor outputs. Each photoreceptor output V.sub.R is first processed by an integrator having a predetermined time constant using a differential transconductance amplifier driving an integrating capacitor, and feeding the output signals V.sub.H back to the negative input, thereby generating a time integrated signal for each pixel of the array. The output terminal of the integrating amplifier is connected to a node that is coupled to the outputs of similar integrators of neighboring pixels by resistive connections thereby forming a spatially smoothed version of the image. At each node a differential amplifier takes the difference between the node potential and local receptor potential, whereby an output representing a first temporal derivative and second spatial derivative is computed.

REFERENCES:
patent: 4602289 (1986-07-01), Sekine
patent: 4644178 (1987-02-01), Michalik
patent: 4680476 (1987-07-01), Berger et al.
patent: 4733097 (1988-03-01), Iwabuchi et al.

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