Method and sensor for determining the local contrast of an...

Details Method and sensor for determining the local contrast of an... Method and sensor for determining the local contrast of an...

2007-01-30

2007-01-30

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208200

Reexamination Certificate

active

10526358

ABSTRACT:
The invention relates to a method of calculating the local contrast at each pixel (PC) in a network (Mp) of photosensitive pixels which are arranged in at least one dimension (x, y). The inventive method consists in, during successive image acquisition cycles, producing a signal which is representative of the local luminance at each pixel, said luminance-representative signals being integrated values of luminance values sensed by the respective pixels (pC, pG, pD, pH, pB). The inventive method consists in: sampling the integrated values of the signals representing the luminance values at the pixels adjacent (pG, pD, pH, pB) to a considered pixel (pC), said sampling taking place at an instant in the cycle when the integrated value of the luminance at the considered pixel (pC) is equal to a pre-determined reference value; and determining the local contrast at the considered pixel (pC) on the basis of values thus sampled.

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Kavidias, S., et al., “A Logarithmic Response CMOS Image Sensor with On-Chip Calibration”, IEEE Journal of Solid-State Circuits vol. 35, Aug. 2002.

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