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Alexandre Schmid

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Publications associées (158)

A Sub-mW Pulse-Based 5-bit Flash ADC with a Time-Domain Fully-Digital Reference Ladder

Alexandre Schmid, Yusuf Leblebici, Radisav Cojbasic, Nikola Katic

Journal article A sub-mW pulse-based 5-bit flash ADC with a time-domain fully-digital reference ladder: A Katic, Nikola; Cojbasic, Radisav; Schmid, Alexandre; Leblebici, Yusuf Published in: Microelectronics Journal (ISSN: 0026-2692), vol. 46, num. 12, ...

Elsevier2015

Real-Time Omnidirectional Imaging System with Interconnected Network of Cameras

Alexandre Schmid, Yusuf Leblebici, Hossein Afshari, Vladan Popovic, Kerem Seyid

The Panoptic camera is an omnidirectional multi-aperture visual system which is realized by mounting multiple imaging sensors on a hemispherical frame. In this chapter, we will present a novel distributed and parallel implementation of the real-time omnidi ...

Springer-Verlag2015

A comparative experimental investigation on responsivity and response speed of photo-diode and photo-BJT structures integrated in a low-cost standard CMOS process

Alexandre Schmid, Yusuf Leblebici, Nikola Katic

A variety of smart imaging and neuromorphic applications perform time-domain image acquisition in order to imitate biological systems and reduce the growing transmission bandwidth of the modern imaging devices. Because they operate in time-domain, they req ...

Elsevier2015

A Relative Imaging CMOS Image Sensor for High Dynamic Range and High Frame-Rate Machine Vision Imaging Applications

Alexandre Schmid, Yusuf Leblebici, Radisav Cojbasic, Nikola Katic, Vladan Popovic

This paper proposes an unconventional image acquisition scheme for machine vision applications, based on detecting ratios of illumination (pixel) intensities. Detecting relative ratios enables capturing the scene features and patterns almost independently ...

Institute of Electrical and Electronics Engineers2015

Enhanced Compressed Look-up-Table Based Real-Time Rectification Hardware

Alexandre Schmid, Yusuf Leblebici, Abdulkadir Akin, Luis Manuel Gaemperle, Halima Najibi

Real-time disparity estimation requires real-time rectification which involves solving the models of lens distortions, image translations and rotations. Low complexity look-up-table based rectification algorithms usually require an external memory to store ...

Springer-Verlag Berlin2015

An Implantable High-Voltage Cortical Stimulator for Post-stroke Rehabilitation Enhancement with High-Current Driving Capacity

Alexandre Schmid, Mustafa Kilic

This paper presents a high-voltage, high-current implantable cortical stimulation integrated circuit aiming at supporting rehabilitation of patients suffering from stroke. In this context, a large area of the motor cortex needs to be stimulated, requiring ...

2015

Analysis and Characterization of Variability in Subthreshold Source-Coupled Logic Circuits

Alexandre Schmid, Yusuf Leblebici, Seyed Armin Tajalli, Mahsa Shoaran

This article explores the effect of device parameter variations on the performance of subthreshold source-coupled logic (STSCL) circuits. A test chip has been fabricated in a standard CMOS 90 nm technology to study the matching properties of STSCL circuits ...

2015

A 5.43-μW 0.8-V Subthreshold Current-Sensing Σ∆ Modulator for Low-Noise Sensor Interfaces

Alexandre Schmid, Yusuf Leblebici, Seyed Armin Tajalli, Nikola Katic

A micro-watt power subthreshold current modulator suitable for low-power and low-noise sensor interfaces is presented. The prototype design is based on Subthreshold Source Coupled Logic (STSCL) cells and implemented in a 0.18 μm standard CMOS technology. T ...

2014

Compact Low-Power Cortical Recording Architecture for Compressive Multichannel Data Acquisition

Alexandre Schmid, Pierre Vandergheynst, Mahdad Hosseini Kamal, Mahsa Shoaran

This paper introduces an area- and power-efficient approach for compressive recording of cortical signals used in an implantable system prior to transmission. Recent research on compressive sensing has shown promising results for sub-Nyquist sampling of sp ...

2014

CMOS-Integrated Photodetectors for Neuromorphic and Smart Imaging Applications: a Low-Cost Design and Measurement Method

Alexandre Schmid, Yusuf Leblebici, Nikola Katic

2014

Dynamically adaptive real-time disparity estimation hardware using iterative refinement

Alexandre Schmid, Yusuf Leblebici, Abdulkadir Akin, Ipek Baz

The computational complexity of disparity estimation algorithms and the need of large size and bandwidth for the external and internal memory make the real-time processing of disparity estimation challenging, especially for High Resolution (HR) images. Thi ...

2014

A Retina-Inspired Robust On-Focal-Plane Multi-Band Edge-Detection Scheme for CMOS Image Sensors

Alexandre Schmid, Yusuf Leblebici, Nikola Katic

An edge-detection scheme suitable for machine vision and digital motion detection applications is presented. The scheme is inspired by the human visual system (human retina) and modified for a compact and scalable CMOS hardware implementation. In addition, ...

IEEE2014

In-Vivo Validation of a Compact Inductively-Powered Neural Recording Interface

Catherine Dehollain, Alexandre Schmid, Mahsa Shoaran, Gürkan Yilmaz

2014

A Novel Compressive Sensing Architecture for High-Density Biological Signal Recording

Alexandre Schmid, Hossein Afshari, Mahsa Shoaran

The massive amount of data recorded by dense electrode arrays which are routinely connected to Nyquist-sampling signal conditioning blocks introduces new design challenges for implantable and wireless biological signal acquisition. Five different architect ...

2014

Low distortion switched-capacitor event-driven analog to digital converter

Alexandre Schmid, Yusuf Leblebici

An event-driven tracking analog to digital converter (ADC) architecture is proposed. The proposed architecture has less sensitivity to amplifier and DAC non-linearity, reduces the swing and dynamic common-mode range requirement of the operational transcond ...

2013

Image Blending in a High Frame Rate FPGA-based Multi-Camera System

Alexandre Schmid, Yusuf Leblebici, Hossein Afshari, Abdulkadir Akin, Vladan Popovic, Kerem Seyid, Ömer Cogal

Panoptic is a custom spherical light field camera used as a polydioptric system where imagers are distributed over a hemispherical surface, each having its own vision of the surroundings and a distinct focal plane. The spherical light field camera records ...

2013

A Hardware-Oriented Dynamically Adaptive Disparity Estimation Algorithm and its Real-Time Hardware

Alexandre Schmid, Yusuf Leblebici, Abdulkadir Akin, Ipek Baz, Irem Boybat Kara, Hüseyin Baris Atakan

2013

The PANOPTIC Camera: A Plenoptic Sensor with Real-Time Omnidirectional Capability

Alexandre Schmid, Yusuf Leblebici, Pierre Vandergheynst, Luigi Bagnato, Laurent Jacques, Hossein Afshari

A new biologically-inspired vision sensor made of one hundred "eyes" is presented, which is suitable for real-time acquisition and processing of 3-D image sequences. This device, named the Panoptic camera, consists of a layered arrangement of approximately ...

Springer Verlag2013

Column-Separated Compressive Sampling Scheme for Low Power CMOS Image Sensors

Alexandre Schmid, Yusuf Leblebici, Pierre Vandergheynst, Mahdad Hosseini Kamal, Nikola Katic, Mustafa Kilic

A novel compressive sampling scheme suitable for highly scalable hardware implementations is presented. The scheme utilizes an identical pseudo-random sequence for every image column, therefore reducing in-pixel hardware complexity and allowing measurement ...

IEEE2013

Compressed look-up-table based real-time rectification hardware

Alexandre Schmid, Yusuf Leblebici, Abdulkadir Akin, Luis Manuel Gaemperle, Ipek Baz

Stereo image rectification is a pre-processing step of disparity estimation intended to remove image distortions and to enable stereo matching along an epipolar line. A real-time disparity estimation system needs to perform real-time rectification which re ...

2013

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