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This paper presents a high DR, high temporal resolution, frame-free image/video camera that encodes and processes visual information in asynchronous spikes. The event-driven optical sensor features 9.3-bit grayscale imaging at up to 143dB DR and <;0.25% FPN with hardware-based lossless video compression and time-domain correlated double sampling. The main components of the camera - the asynchronous,...
This paper describes concept and implementation of an asynchronous, column-parallel readout method for event-based pulse-width-modulation (PWM) image sensors. These time-based imaging devices transmit exposure information in the form of asynchronous spike-events (AER) via an arbitrated asynchronous data bus that is common to all pixels. Event-collisions on the bus distort the time information and...
This live demonstration shows high DR, high temporal resolution, frame-free image/video acquisition based on asynchronous events. The presented camera features 9-bit gray-level imaging at up to 143dB DR and <;0.25% FPN with hardware-based lossless video compression and time-domain correlated double sampling. The main components of the camera - an asynchronous, time-based image sensor (ATIS) and...
The presented asynchronous, time-based CMOS dynamic vision and image sensor is based on a QVGA (304×240) array of fully autonomous pixels containing event-based change detection and PWM imaging circuitry. Exposure measurements are initiated and carried out locally by the individual pixel that has detected a brightness change in its field-of-view. Thus pixels do not rely on external timing signals...
A 0.18??m CIS contains a QVGA array of autonomous pixels that individually detect illumination changes and communicate new gray levels that are PWM encoded after each detected change, ideally realizing optimal lossless pixel-level video compression. Readout is frame-free 18b parallel AER. SNR of >56dB and infra-scene DRs of 143dB static and 125dB at 30fps equivalent have been achieved.
This paper presents analytical considerations and practical thoughts leading to the design and implementation of a low power, small-area voltage comparator for pixel-level signal processing in time-based image sensors. The circuit is based on a standard two-stage operational amplifier topology and features an offset suppression technique to minimize the area requirements, a tunable hysteresis and...
This paper presents a time-domain correlated double sampling (CDS) method for time-based/PWM image sensors. The concept has been realized in the pixel circuit design for a spiking asynchronous, time-based image sensor (ATIS). The pixel circuitry includes a two-stage voltage comparator with tunable hysteresis and dynamic current control, and pixel-level state logic. The sensor, based on a 240times304...
In this paper, a novel event-based dynamic IR vision sensor is presented. The device combines an uncooled microbolometer array with biology-inspired (ldquoneuromorphicrdquo) readout circuitry to implement an asynchronous, ldquospikingrdquo vision sensor for the 8-15 mum thermal infrared spectral range. The sensor's autonomous pixels independently respond to changes in thermal IR radiation and communicate...
This paper presents the characterization of a novel event-based 64 times 64 pixel temporal contrast IR sensor. The device consists of a micro-bolometer thermistor array and a CMOS readout IC employing asynchronous, spiking pixel circuits. The pixels independently respond to changes in thermal IR radiation and communicate detected variations in the form of asynchronous ldquoaddress-eventsrdquo (AER)...
In this paper we propose a fully asynchronous, time- based image sensor, which is characterized by high temporal resolution, low data rate (near complete temporal redundancy suppression), high dynamic range, and low power consumption. Autonomous pixels asynchronously communicate the detection of relative changes in light intensity, and the time from change detection to the threshold crossing of a...
This paper presents a 64times64 pixel micro-bolometer based temporal contrast IR sensor. The pixels of the sensor independently and asynchronously respond to changes in thermal IR radiation and communicate respective events via arbitrated AER. A 46 dB-gain, small-area, ultra low-power, low-mismatch differencing switched-capacitor amplifier has been designed for reading out the bolometer front-end...
This paper presents a small-area, ultra low-power, low-mismatch differencing amplifier for use in transient pixels of micro-bolometer based temporal contrast IR sensors. The two-stage capacitive-feedback amplifier works in the sub-threshold domain, has a voltage gain of 46 dB, a 3 dB bandwidth of about 10 kHz and consumes 85 nW of static power. The amplifier circuit has been fabricated in a 0.35 mum...
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