Ralf M. Philipp

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A current mode CMOS active pixel sensor (APS) providing linear light-to-current conversion with inherently low fixed pattern noise (FPN) is presented. The pixel features adjustable-gain current output using a pMOS readout transistor in the linear region of operation. This paper discusses the pixel’s design and operation, and presents an analysis of the(More)
Neuromorphic vision systems are ideal for mobile applications because they promise compact computational sensing at lower power consumption compared to the traditional imager/ADC/CPU systems. These properties are particularly important for unmanned aerial vehicles. We present current-mode low noise imaging, which is typically difficult to realize, and(More)
An architectural overview of an image sensor with general spatial processing capabilities on the focal plane is presented. The system has been fabricated on two separate tiers, implemented on silicon-on-insulator technology with vertical interconnect capabilities. One tier is dedicated to imaging, where photosensitivity and pixel fill have been optimized.(More)
A single chip containing two 128×128 pixel imagers and currentmode disparity computation circuitry is described. Previous stereo vision sensors have not integrated computation circuitry [1] on the focal plane, or been limited to single depth values [2]. The previous single-chip stereo imager [3] used continuous-time imaging and computation circuits. These(More)
This paper introduces a depth-computation architecture designed for, but not limited to, a single-chip current mode analog VLSI (aVLSI) implementation of stereo vision. The architecture implements a modified version of the block matching algorithm; pixel blocks are averaged (summed) vertically before comparison along the horizontal axis. This both reduces(More)
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