A 0.5 V, 14.28 kframes/s, 96.7 dB Smart Image Sensor With Array Level Image Signal Processing for IoT Applications
This paper presents a smart image sensor with multiple operation modes, including edge extraction, multipoint tracking (MPT) and high dynamic range (HDR) imaging for wireless sensor nodes in Internet of Things applications. The pixel consists of a 0.5 V operated pulsewidth modulation sensor for achieving HDR response and low fixed pattern noise. Array level image signal processing is implemented using a local interpixel feedback network, in pixel low power dynamic logics, and a corresponding peripheral with an event driven hand shaking readout. A prototype chip with a 64 x 64 CMOS image sensor (CIS) array is designed and fabricated in a TSMC 0.18 mm CIS technology. In the MPT mode, the measured tracking speed is 14.28 kframes/s with an error of 0.36 pixels and a tracking capability up to four points. In the HDR imaging mode, the achieved DR is 96.7 dB.
IEEE Transactions on Electron Devices