A motion detection algorithm, based on biological and computational models, for focal plane implementation has been developed, This Temporal Domain Optical Flow Measurement (TDOFM) algorithm uses computational compone...
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A motion detection algorithm, based on biological and computational models, for focal plane implementation has been developed, This Temporal Domain Optical Flow Measurement (TDOFM) algorithm uses computational components which have direct and compact electronic counterparts, It uses a binary image of zero-crossings, 2 level analog signals, the signs of spatiotemporal derivatives, 1-b multiplication and pulsewidths to measure image velocity, Compared to other IC visual motion detectors, this sensor represents the first instance of a robust, wideband and general purpose 2-D motion sensor which reports speed and direction explicitly, has a wide dynamic range and has a compact IC implementation. The front-end of the motion cells is an edge detection circuit which responds to 5-6 orders of magnitude of light intensity and produces near maximum outputs for contrasts as low as 40% in bright and dim ambient conditions. The theoretical velocity measurement dynamic range of the sensor is 4-5 orders of magnitude, and motion ranging over three orders of magnitude has been measured, The variation in the measured speed is less than 15% across 1- and 2-D implementations, multiple chips, cells and directions, The complete system, including the photoreceptors and edge detection circuits, consumes less than 0.4 mW per cell at +/- 3.5 V.
We propose a novel signal scanning method using a tree structure of automata. This method has a kind of image compression capability, about 1/6-1/20 for samples images, by skipping the scan of non-active elements with...
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We propose a novel signal scanning method using a tree structure of automata. This method has a kind of image compression capability, about 1/6-1/20 for samples images, by skipping the scan of non-active elements with a selectively activated signal path only to active elements. We also demonstrate the effect of data compression for some examples and an implementation of tree structure on a VLSI chip. (C) 1998 Elsevier Science Ltd. All rights reserved.
We propose a motion adaptive sensor for image enhancement and wide dynamic range, which has computational elements based on a column-parallel architecture. The proposed sensor not only operates at high frequency but a...
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ISBN:
(纸本)0819423548
We propose a motion adaptive sensor for image enhancement and wide dynamic range, which has computational elements based on a column-parallel architecture. The proposed sensor not only operates at high frequency but also detects motion and saturation of the stored charge on photo diode independently pixel by pixel. The motion adaptive sensor is able to control the suitable storage time in each pixel which results in no motion-blur and no saturation so that it is expected to have high temporal resolution in the moving area, high SNR in the static area and also an effect resulting in wide dynamic range. In this paper, toe discuss the principle, design of motion adaptive sensor and some results of simulations.
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