I am currently a professor of Electrical & Computer Engineering at Johns Hopkins University (JHU). I was the Associate Director for Education and Outreach of the National Science Foundation (NSF) sponsored Engineering Research Centers on Computer Integrated Surgical Systems and Technology at JHU and the former Director of Computer Engineering at JHU and the Institute of Neuromorphic Engineering (currently administered by University of Maryland, College Park).
Research interest includes mixed signal VLSI systems, computational sensors, computer vision, neuromorphic engineering, smart structures, mobile robotics, legged locomotion and neuroprosthetic devices.
I received my B. Sc. in physics, 1988, from Lincoln University, Pennsylvania. I completed my M.S.E.E. and Ph.D. in electrical engineering at the University of Pennsylvania in December 1991 and 1994, respectively. I have served as Chairman of the IEEE Circuits and Systems (CAS) Technical Committee on Sensory Systems and on Neural Systems and Application, and was re-elected as a member of CAS Board of Governors from 1/2007 – 1/2009. I was also the General Chair of the IEEE BioCAS Conference in 2008, and serves on its Steering Committee. I was also a member of Imagers, MEMS, Medical and Displays Technical Committee of the ISSCC Conference from 1999 – 2006. I also serve on numerous editorial boards and was recently appointed Deputy Editor in Chief for the IEEE Transactions on Biomedical Circuits and Systems. I am the recipient of the NSF’s Career and Office of Naval Research Young Investigator Program Awards. In 2006, I was named a Visiting African Fellow and a Fulbright Fellowship Grantee for his sabbatical at University of Cape Town, South Africa. I was invited to be a lecturer at the National Academies of Science Kavli Frontiers Program, held in November 2007. I won the 2010 JHU Applied Physics Lab R.W. Hart Prize for Best R&D Project in Development. I have also won publication awards, including the 2011 Best Paper Award for IEEE Transactions of Biomedical Circuits and Systems, 2003 Best Paper Award of the EURASIP Journal of Applied Signal Processing and “Best Ph.D. in a Nutshell” at the IEEE BioCAS 2008 Conference, and have been recognized for my activities in promoting the participation of women and minorities in science, technology, engineering and mathematics. In 2012, I was recognized as a “ScienceMaker”, as part of the HistoryMakers which is an African American history archive and was elected as an IEEE Fellow for contributions in “neuromorphic sensory-motor circuits and systems”.
Proto-Object Based Saliency Model with Second-Order Texture Feature
Automated Tracking System for Identification of Tagged Mice for Automatic Social Behavior Analysis
Computational stereo-vision model of proto-object based saliency in three-dimensional space
The Challenges of Designing an Inductively Coupled Power Link for μm-sized On-Chip Coils
Large-Scale Neuromorphic Spiking Array Processors: A Quest to Mimic the Brain
Using Deep Learning to Extract Scenery Information in Real Time Spatiotemporal Compressed Sensing
An Unsupervised Compressed Sensing Algorithm for Multi-Channel Neural Recording and Spike Sorting
An analogue neuromorphic Co-processor that utilizes device mismatch for learning applications
The Microbead: A Highly Miniaturized Wirelessly Powered Implantable Neural Stimulating System
Compressed Sensing for High Density Neural Recording
Spatiotemporal compressed sensing for video compression
Live demonstration: A compact all-CMOS spatiotemporal compressed sensing video camera
Neuromorphic visual saliency implementation using stochastic computation
Low-power, low-mismatch, highly-dense array of VLSI Mihalas-Niebur neurons
Live demonstration: Event-based image processing on CMOS Mihalas-Niebur neuron array transceiver
Iontophoresis instrumentation for the enhancement of gene therapy in wound healing
Live demonstration: A wirelessly powered highly miniaturized neural stimulator
In-vivo tests of an inductively powered miniaturized neural stimulator
A model based approach for realizing a safe wireless biotelemetry system
Novel integration and packaging concepts of highly miniaturized inductively powered neural implants
Active phantoms: a paradigm for ultrasound calibration using phantom feedback
Coil array design for maximizing wireless power transfer to sub-mm sized implantable devices
Real-time image segmentation using a spiking neuromorphic processor
Inference in spiking Bayesian neurons using stochastic computation
A CMOS current steering neurostimulation array with integrated DAC calibration and charge balancing
Intraspinal microstimulation produces over-ground walking in anesthetized cats
Intraspinal microstimulation produces over-ground walking in anesthetized cats
Stochastic image processing and simultaneous dewarping for aerial vehicles
A compact, low-power, fully analog implantable microstimulator
Enhanced visual perception through tone mapping
Compact all-CMOS spatiotemporal compressive sensing video camera with pixel-wise coded exposure
A 5 μW/channel 9b-ENOB BioADC array for electrocortical recording
Live demonstration: Real-time implementation of a proto-object-based dynamic visual saliency model
Giving machines humanlike eyes
CMOS implementation of pixel-wise coded exposure imaging for insect-based sensor node
Compressed sensing block-wise exposure control algorithm using optical flow estimation
FPGA emulation of a spike-based, stochastic system for real-time image dewarping
Active point out-of-plane ultrasound calibration
An unsupervised dictionary learning algorithm for neural recordings
How is motion integrated into a proto-object based visual saliency model?
A closed-loop compressive-sensing-based neural recording system.
HFirst: A Temporal Approach to Object Recognition
A dictionary learning algorithm for multi-channel neural recordings
Active Ultrasound Pattern Injection System (AUSPIS) for Interventional Tool Guidance
Live demonstration: A closed loop Compressive Sensing neural recording system
Energy-efficient multi-mode compressed sensing system for implantable neural recordings
Bioinspired imaging: discovery, emulation, and future prospects
Bioinspired Visual Motion Estimation
Active echo: a new paradigm for ultrasound calibration
Photoacoustic active ultrasound element for catheter tracking
An Efficient and Compact Compressed Sensing Microsystem for Implantable Neural Recordings
An efficient and compact compressed sensing microsystem for implantable neural recordings
Energy-efficient two-stage Compressed Sensing method for implantable neural recordings
Proto-object based visual saliency model with a motion-sensitive channel
A model of proto-object based saliency
Real-time motion estimation using spatiotemporal filtering in FPGA
A spiking neural network architecture for visual motion estimation
Selecting a safe power level for an indoor implanted UWB wireless biotelemetry link
Empowering Low-Cost CMOS Cameras by Image Processing to Reach Comparable Results with Costly CCDs
Reconstruction of neural action potentials using signal dependent sparse representations
Fast Neuromimetic Object Recognition Using FPGA Outperforms GPU Implementations
Fast neuromimetic object recognition using FPGA outperforms GPU implementations
Auditory modulation of visual proto-object formation in a hierarchical auditory-visual saliency map
Plenoptic cameras in real-time robotics
Live demonstration: A tactile perception system for sensing the visual world
Live demo: Spiking ratslam: Rat hippocampus cells in spiking neural hardware
A Miniaturized Platform for Laser Speckle Contrast Imaging
A miniaturized platform for laser speckle contrast imaging
Real Time Compressive Sensing Video Reconstruction in Hardware
Real time compressive sensing video reconstruction in hardware
Neuromorphic approach to a locomotion control algorithm as applied to the cat walking cycle
Intraspinal Microstimulation for Restoring Walking
Perceptual organization, attention and object recognition: Closing the loop
An entropy based ideal observer model for visual saliency
Parameter estimation of a spiking silicon neuron
Feed forward and feedback control for over-ground locomotion in anaesthetized cats
Design of a novel head-mountable microscope system for laser speckle imaging
Computer Aided Detection Of Retained Foreign Bodies
Maximum likelihood parameter estimation of a spiking silicon neuron
A CMOS in-pixel CTIA high-sensitivity fluorescence imager
Implementation of functional components of the locomotion processing unit
Neuromorphic silicon neuron circuits
Silicon Modeling of the Mihalaş–Niebur Neuron
A low-cost COTS UWB transceiver for biological applications achieves 50 Mb/s with < 10−6 Raw BER
A novel 3D display using multi-hyperstereo image stitching
Confession session: Learning from others mistakes
Optimization methods for spiking neurons and networks
Discriminating multiple nearby targets using single-ping ultrasonic scene mapping
An integrated imaging microscope for untethered cortical imaging in freely-moving animals
Synthesis of log-domain integrators for silicon synapses with global parametric control
A spike based 3D imager chip using a mixed mode encoding readout
Current mode image sensor with two transistors per pixel
Phase-based control of the central pattern generator for locomotion
Decoding of individuated finger movements using surface electromyography
A color detection glove with haptic feedback for the visually disabled
Real-time implementation of biofidelic sa1 model for tactile feedback
Simulation of a single ping ultrasonic bearing estimation design using spatiotemporal filtering
Which photodiode to use: a comparison of CMOS-compatible structures
Design and characterization of a miniaturized epi-illuminated microscope
Low-voltage high CMRR OTA for electrophysiological measurements
A switched capacitor implementation of the generalized linear integrate-and-fire neuron
A CMOS switched capacitor implementation of the Mihalas-Niebur neuron
Focal-plane change triggered video compression for low-power vision sensor systems
A silicon central pattern generator controls locomotion in vivo
Biomorphic circuits and systems: Control of robotic and prosthetic limbs
The feeling of color: A haptic feedback device for the visually disabled
A two-neuron cross-correlation circuit with a wide and continuous range of time delay
Towards control of dexterous hand manipulations using a silicon Pattern Generator
Practical considerations for the use of a Howland current source for neuro-stimulation
Configuring silicon neural networks using genetic algorithms
Real-time silicon implementation of V1 in hierarchical visual information processing
Implementing a neuromorphic cross-correlation engine with silicon neurons
Adaptive hysteretic comparator with opamp threshold level setting
A 5-bits precision CMOS bandgap reference with on-chip bi-directional resistance trimming
Finite element modeling of tissue for optimal ultrasonic transducer array design
Image sensor with focal plane change event driven video compression
A size and position invariant event-based human posture recognition algorithm
Correction to" Asynchronous Decoding of Dexterous Finger Movements Using M1 Neurons"[Feb 08 3-14]
Asynchronous decoding of dexterous finger movements using M1 neurons
Wireless systems could improve neural prostheses
Two transistor current mode active pixel sensor
Wireless address event representation system for biological sensor networks (Invited Paper)[6592-04]
CMOS imagers: from phototransduction to image processing
A multichip neuromorphic system for spike-based visual information processing
Towards the control of individual fingers of a prosthetic hand using surface EMG signals
Sensor-based dynamic control of the central pattern generator for locomotion
A simple neural cross-correlation engine
Linear current-mode active pixel sensor
AER auditory filtering and CPG for robot control
Wireless address event representation system for biological sensor networks
Spike-based MAX networks for nonlinear pooling in hierarchical vision processing
A robust multi-application automatic gain control chip
Video sensor node for low-power ad-hoc wireless networks
Optical flow approximation of sub-pixel accurate block matching for video coding
ISCAS Special Session Demo: Wireless Video Sensor for Ad-hoc Networks
CMOS camera with in-pixel temporal change detection and ADC
Non-Linear Neural Spike Train Decoding via Polynomial Kernel Regression
Towards a brain-computer interface for dexterous control of a multi-fingered prosthetic hand
Image sensor with general spatial processing in a 3D integrated circuit technology
Phase-dependent effects of spinal cord stimulation on locomotor activity
Dynamic control of spinal locomotion circuits
A floating-gate programmable array of silicon neurons for central pattern generating networks
A second-generation single-chip stereo imager
A 128 x128 33mW 30frames/s single-chip stereo imager
Normal flow measurement visual motion sensor
A simplified normal optical flow measurement CMOS camera
Neuromorphic vision systems for mobile applications
Power dissipation sources and possible control techniques in ultra deep submicron CMOS technologies
Modeling and Simulation of a VLSI Chip for Adaptive Speed Control of Brushed DC Motors
A configurable VLSI chip for DC motor control for compact, low-current robotic systems
Design of an ultrasonic micro-array for near field sensing during retinal microsurgery
Cmos pixel-level ADC with change detection
Electrical stimulation of a spinal central pattern generator for locomotion
A spiking silicon central pattern generator with floating gate synapses [robot control applications]
A 1V current-mode CMOS active pixel sensor
Temporal change threshold detection imager
A real-time spike-domain sensory information processing system [image processing applications]
CPG design using inhibitory networks
On-chip normal flow computation with aperture problem compensation circuitry
ColorCam: a color-based object recognition camera
Sonar echo-location in 2-D using mini-microphone array and spatiotemporal frequency filtering
Spatial acuity modulation of an address-event imager
Saliency-driven image acuity modulation on a reconfigurable array of spiking silicon neurons
A programmable array of silicon neurons for the control of legged locomotion
Low power current rectifiers for large scale current-mode signal processing
Normal optical flow measurement on a CMOS APS imager
A focal plane normal-flow measurement chip
A time-series novelty detection chip for sonar
Linear current mode imager with low fix pattern noise
A pipelined temporal difference imager
Active pixel sensor with on-chip normal flow computation on the read out
Second generation of high dynamic range, arbitrated digital imager
Sensing signal input bearing to sensor array using velocity-sensitive spatiotemporal filters
Focal-plane analog image processing
Bearing angle estimation for sonar micro-array using analog VLSI spatiotemporal processing
Entrainment of silicon central pattern generators for legged locomotory control
Vision chip for navigating and controlling micro unmanned aerial vehicles
A time-series processor for sonar mapping and novelty detection
A vision chip for color segmentation and pattern matching
A biomorphic digital image sensor
Biologically inspired vision sensors
Ultrasonic bearing estimation using a MEMS microphone array and spatiotemporal filters
Architecture for an aVLSI stereo vision system
Pipelined temporal difference imager
Implementation of steerable spatiotemporal image filters on the focal plane
Single chip for imaging, color segmentation, histogramming and pattern matching
A dual pixel-type array for imaging and motion centroid localization
High dynamic range, arbitrated address event representation digital imager
Novel Real-Time Tremor Transduction Technique for Microsurgery
Control of a robot leg with an adaptive aVLSI CPG chip
Programmable spatial processing imager chip
High-resolution focal plane image processing
High performance biomorphic image processing under tight space and power constraints
Biologically inspired visual motion detection in VLSI
Architecture for source localization with a linear ultrasonic array
A programmable focal-plane MIMD image processor chip
A dual pixel-type imager for imaging and motion centroid localization
A programmable spatiotemporal image processor chip
Single-capacitor-single-contact active pixel sensor
Toward biomorphic control using custom aVLSI CPG chips
Precision minimally invasive surgery by adaptive organ motion tracking and compensation
CPU-less robotics: distributed control of biomorphs
A foveated silicon retina for two-dimensional tracking
Visual Gait Modification 1st Year Technical Report
Intelligent robot vision sensors in VLSI
Hardware implementation of a visual-motion pixel using oriented spatiotemporal neural filters
Architecture for distributed actuation and sensing using smart piezoelectric elements
Neuromorphic and digital hybrid systems
A general purpose image processing chip: Orientation detection
A focal plane visual motion measurement sensor
VLSI model of Primate visual smooth pursuit
VLSI implementation of cortical visual motion detection using an analog neural computer
Real-time visual target tracking: two implementations of velocity-based smooth pursuit
Accurate and simple CMOS'one-over'circuit
A new temporal domain optical flow measurement technique for focal plane VLSI implementation
An analog neural computer with modular architecture for real-time dynamic computations
An analog neural computer with modular architecture for real-time dynamic computations
Real-time decomposition and recognition of acoustical patterns with an analog neural computer
Real-time 2D analog motion detector VLSI circuit
Design and performance of a prototype general purpose analog neural computer
A multichip analog neural network
Artificial neural networks: principles and VLSI implementation