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An Analog VLSI Chip for Estimating the Focus of Expansion
 In 1997 ISSCC Digest of Technical Papers
, 1996
"... For applications involving the control of moving vehicles, the recovery of relative motion between a camera and its environment is of high utility. This thesis describes the design and testing of a realtime analog vlsi chip which estimates the focus of expansion (foe) from measured timevarying ima ..."
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Cited by 6 (1 self)
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For applications involving the control of moving vehicles, the recovery of relative motion between a camera and its environment is of high utility. This thesis describes the design and testing of a realtime analog vlsi chip which estimates the focus of expansion (foe) from measured timevarying images. Our approach assumes a camera moving through a fixed world with translational velocity; the foe is the projection of the translation vector onto the image plane. This location is the point towards which the camera is moving, and other points appear to be expanding outward from. By way of the camera imaging parameters, the location of the foe gives the direction of 3D translation. The algorithm we use for estimating the foe minimizes the sum of squares of the differences at every pixel between the observed time variation of brightness and the predicted variation given the assumed position of the foe. This minimization is not straightforward, because the relationship between the brightn...
Design and Analysis of CurrenttoVoltage and Voltage toCurrent Converters using 0.35µm technology
"... Abstract — This paper presents the design of a CurrenttoVoltage (I−V) and VoltagetoCurrent (V−I) converters for use in currentmode analog integrated circuits are described. The proposed I−V converter and VI Converter has high linear range. The circuit uses MOS transistors in linear and saturat ..."
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Abstract — This paper presents the design of a CurrenttoVoltage (I−V) and VoltagetoCurrent (V−I) converters for use in currentmode analog integrated circuits are described. The proposed I−V converter and VI Converter has high linear range. The circuit uses MOS transistors in linear and saturation regions to produce an output current linearly related to the input voltage. Both circuits have been implemented in a 0.35μm standard digital CMOS process. Keywords—Current mode circuits, CurrenttoVoltage converter, Voltagetocurrent Converter I.