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7 June 2004 Biomimetic sampling architectures for CMOS image sensors
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We demonstrate a non-orthogonal architecture for a CMOS active pixel image sensor, called here pyramid architecture, for improved two-dimensional spatial sampling. In the pyramid architecture 2D sampling using concentric rings replaces the 1D row sampling in the classical imager architecture, and diagonal output busses replace the conventional vertical column busses. Moreover, we propose a scanning scheme in which, instead of rolling over to the first ring (or row) at the end of image capture, the scan returns from the outer ring towards the first inner ring at the centre of the sensor. This leads to two scenes of differing integration times that, after being fused, results in a foveated increase in intra-scene dynamic range. Results from a sensor fabricated in 0.18μm CMOS technology are presented and discussed. We will also present a multi-resolution architecture which is based on the pixel structures as building block to control the acquired image resolution.
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Faycal Saffih and Richard Hornsey "Biomimetic sampling architectures for CMOS image sensors", Proc. SPIE 5301, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V, (7 June 2004);

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