A Micropower Centroiding Vision Processor

Constandinou, Timothy G.; Toumazou, C.

doi:10.1109/jssc.2006.874330

Cited by 24 publications

(9 citation statements)

References 24 publications

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“…Figure 4 shows the circuit schematic of the edge detector element. This has been adapted from Constandinou et al [9,10] to the expected contrast ratio and photocurrent levels. A global tuning mechanism is maintained by driving the I bias and I tune references off-chip and internally duplicating and distributing to the individual edge detector elements.…”

Section: Horizon Detector Circuitmentioning

confidence: 99%

Micro‐Optoelectromechanical Tilt Sensor

Constandinou

Georgiou

2008

Journal of Sensors

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This paper presents a novel hybrid CMOS/MEMS tilt sensor with a5∘resolution over a300∘range. The device uses a MEMS-based semicircular mass suspended from a rigid body, projecting a shadow onto the CMOS-based optical sensor surface. A one-dimensional photodiode array arranged as a uniformly segmented ring is then used to determine the tilt angle by detecting the position of the semicircular mass. The complete sensor occupies an area of under 2.5 mm×2.5 mm.

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Section: Horizon Detector Circuitmentioning

confidence: 99%

Micro‐Optoelectromechanical Tilt Sensor

Constandinou

Georgiou

2008

Journal of Sensors

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“…4 shows the circuit schematic of the edge detector element. This has been adapted from [9], [10] to the expected contrast ratio and photocurrent levels. A global tuning mechanism is maintained by driving the I bias and I tune references off-chip and internally duplicating and distributing to the individual edge detector elements.…”

Section: B Edge Detector Circuitmentioning

confidence: 99%

An ultra-low-power micro-optoelectromechanical tilt sensor

Constandinou

Georgiou

Andreou

2008

2008 IEEE International Symposium on Circuits and Systems (ISCAS)

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Abstract-This paper presents a novel hybrid CMOS/MEMS tilt sensor with a 5 o resolution over a 330 o range. The device uses a MEMS-based semicircular mass suspended from a rigid body, projecting a shadow onto the CMOS-based optical sensor surface. A one-dimensional photodiode array arranged as a uniformly segmented ring is then used to determine the tilt angle by detecting the position of the semicircular mass. The complete sensor occupies an area of under 2.5mm×2.5mm.

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“…Digital imaging systems such as stereo cameras are the most widely known existing technology in this application space [6,7]. These use active pixel sensors (APS) to generate a video, then identify and track an object frame-by-frame using image analysis algorithms [8][9][10]. APS tracking systems are powerful and flexible but require high-quality optical lenses, large area (several cm 2 ) megapixel image sensors, and dedicated high-speed image processors.…”

Section: Introductionmentioning

confidence: 99%

Integrated Circuit Angular Displacement Sensor with On-chip Pinhole Aperture

Wijesinghe

Dey

Marshall

et al. 2020

Sensors

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Sensors that remotely track the displacement of a moving object have a wide range of applications from robotic control to motion capture. In this paper, we introduce a simple, small silicon integrated circuit sensor that tracks the angular displacement of an object tagged with a small light source, such as a light-emitting diode (LED). This sensor uses a new angular transduction mechanism, differential diffusion of photoelectrons generated from the light spot cast by the light tag onto a Si anode, that is described by a simple physics model using pinhole optics and carrier diffusion. Because the light spot is formed by a pinhole aperture integrated on the sensor chip, no external focusing optics are needed, reducing system complexity, size, and weight. Prototype sensors based on this model were fabricated and their basic characteristics are presented. These sensors transduce angular displacement of an LED across orthogonal latitudinal and longitudinal arcs into normalized differential photocathode currents with signal linearly proportional to LED angular position across a ± 40° field-of-view. These sensors offer potential performance and ease-of-use benefits compared to existing displacement sensor technologies.

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A Micropower Centroiding Vision Processor

Cited by 24 publications

References 24 publications

Micro‐Optoelectromechanical Tilt Sensor

Micro‐Optoelectromechanical Tilt Sensor

An ultra-low-power micro-optoelectromechanical tilt sensor

Integrated Circuit Angular Displacement Sensor with On-chip Pinhole Aperture

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