Matthew Clapp

Matthew Clapp

PhD

About

15
Publications
1,948
Reads
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208
Citations

Publications

Publications (15)
Article
Full-text available
An array of 90times90 active pixel sensors (APS) with pixel-level embedded differencing and comparison is presented. The nMOS-only 6T 2C 25 mum times 25 mum pixel provides both analog readout of pixel intensity and a digital flag indicating temporal change at variable thresholds. Computation is performed through a pixel-level capacitively coupled c...
Chapter
In this chapter, three systems for imaging and visual information processing at the focal plane are described: current-mode, voltage-mode and mixed-mode image processing. It is demonstrated how spatiotemporal image processing can be implemented in the current and voltage modes. A computation-on-readout (COR) scheme is highlighted; this scheme maxim...
Article
Presented is a mixed-signal full-custom VLSI chip designed to receive sonar return signals from an ultrasonic microphone array, and extract input bearing angles of the incoming signals. Processing utilizes simple low-power analog spatiotemporal bandpass filters to extract wavefront velocity across the array, which translates to input bearing angle....
Conference Paper
Full-text available
An array of 90 times 90 active pixel sensors (APS) that performs both in-pixel temporal intensity change detection and analog-to-digital conversion is presented. The 6-T 3-C 25mum times 25mum pixel fabricated on a 0.5mum 3M2P CMOS process provides a digital output of light intensity via an integrated single slope ADC. Using the programmable thresho...
Conference Paper
Full-text available
Sonar array technology enables sensing of both range and angle bearing of objects with respect to the array. Instead of relying on a narrow angle of transmission and reception and multiple sensor positions, one array can receive returns from a large area and still offer angular localization of targets. We have designed and constructed array process...
Conference Paper
Full-text available
A 90×90 active pixel sensor (APS) achieves 2% in-pixel change/motion detection at 30f/s consuming 4.2mW. The 6T2C 25μm × 25 μm pixel in 0.5 μm 2P3M CMOS provides intensity readout, detection of change events and polarities. Event address and APS value output are asynchronous, facilitating compression. The imager is intended for low-power low-bandwi...
Conference Paper
Full-text available
The authors describe an analog VLSI chip designed to extract incoming bearing angle from ultrasonic signals received by an array of microphones. The processing uses spatiotemporal filters to extract the velocity of a wavefront moving across the array, and from this velocity the incident angle is computed. Spatiotemporal filtering is far more compat...
Article
A system is presented to process ultrasonic signals from an array of MEMS microphones to determine the angle of incidence of the original signal. Apparent velocity of the wavefront across the array is processed using spatiotemporal filters, each tuned to a different velocity. Simulation results demonstrate one-degree accuracy for SNR>14 dB.
Article
An imager chip has been designed, fabricated, and tested having two unique pixel types interleaved on the same array. The dual-pixel design enables optimization for two separate tasks. One type of pixel is an active pixel sensor (APS), which is used to produce a low-noise image. The other type is a custom-designed pixel optimized for computing the...
Conference Paper
Full-text available
Simulation results are presented for a method to process ultrasonic signals from an array of MEMS microphones to determine the angle of incidence of the original signal. Specifically, noise immunity is a primary concern, as is low-power operation and compact implementation. To achieve these objectives, a bank of spatiotemporal filters is the method...
Article
Image processing for space systems must be performed under tight space and power constraints while not compromising performance. Traditional computer vision approaches are not ideal because they are notoriously power hungry and physically large. We present two biologically inspired image processing systems that offer high performance on tight volum...
Article
Two types of focal plane image processing chips are presented. They address the two extremes of the application spectrum: general purpose and application specific designs. They both exploit the promise of focal-plane computation offered by CMOS technology. The general-purpose computational sensor, a 16 X 16 pixels prototype (easily scalable to larg...
Conference Paper
We present an architecture for applying synthetic aperture processing to determine the direction of arrival of ultrasonic waves. Three linear arrays of MEMS ultrasonic microphones have been designed and fabricated for this purpose. The microphones' diameters are 0.8, 0.4 and 0.2 mm, for resonance frequencies of approximately 34, 110 and 520 KHz, re...
Conference Paper
An imager chip has been designed, fabricated, and tested having two unique pixel types interleaved on the same array. The dual-pixel design enables optimization for two separate tasks. One type of pixel is an Active Pixel Sensor (APS), which is used to produce a low-noise image. The other type is a custom-designed pixel optimized for computing the...

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Projects

Project (1)
Project
To create a Mac/Windows application that counts objects in an image automatically using Machine Learning.