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??An integrated circuit with on-chip photoreceptors is described, that computes the bi-directional velocity of a visual stimulus moving along a given axis in the focal plane by measuring the time delay of its detection at two positions. Due to the compactness of the circuit, a dense array of such motion-sensing elements can be monolithically integrated to(More)
We fabricated an improved version of an imager reported earlier [1], primarily by using better pixel circuit and layout principles. The new imager functions over 5 decades of background illumination and has much more symmetrical ON and OFF responses. This imager achieves massive redundancy reduction by temporally differentiating the image contrast. The(More)
With 'photo-ASKS' comprlsmg hght-sensitive structures, hght-emmmg devices and analog and chgtal clrcults, complete optlcal metrology systems can be Integrated on a smgle chip We report the reahzatlon of key components of such photo-ASICs usmg an mdustrual IC CMOS process We achieve photodlodes with an external quantum efficiency of 50-80% m the visible(More)
We describe a programmable multi-chip VLSI neuronal system that can be used for exploring spike-based information processing models. The system consists of a silicon retina, a PIC microcontroller, and a transceiver chip whose integrate-and-fire neurons are connected in a soft winner-take-all architecture. The circuit on this multi-neuron chip approximates a(More)
—The implementation of a compact continuous-time optical transient sensor with commercial CMOS technology is presented. In its basic version, this sensor consists of a photodiode, five transistors and a capacitor. The proposed circuit produces several output signals in parallel. These include a sustained, logarithmically compressed measure of the incoming(More)
We present a multi-chip neuromorphic system in which an Address Event Representation is used for inter-chip communication. The system comprises an analog VLSI transient imager with adaptive photoreceptors, an analog VLSI motion receiver chip and a prototyping communication infrastructure which allows for programmability of connections between the elements(More)
—Detailed processing of sensory information is a computationally demanding task. This is especially true for vision, where the amount of information provided by the sensors typically exceeds the processing capacity of the system. Rather than attempting to process all the sensory data simultaneously, an effective strategy is to focus on subregions of the(More)
We present a CMOS VLSI image sensor containing a 26 × 26 array of differentiating adaptive photoreceptors, combined with a current-mode hysteretic winner-take-all (WTA) network, able to detect and track high-contrast targets moving within its field of view. The device, implemented using standard 0.8 µm CMOS technology, dissipates 600 µW, with a power supply(More)