Publications by Ömer Cogal | EPFL Graph Search

Large field of view multi-camera endoscopic apparatus with omni-directional illumination

A multi-camera hemispherical very wide field of view imaging apparatus with omnidirectional illumination capability comprises a cylindrical body (4, 4.a, 4.b), a hemispherical mechanical frame (2) arranged on one end of the cylindrical body (4, 4.a, 4.b), ...

2020

Large Field of View Multi-Camera Endoscopic Apparatus with Omni-Directional Illumination

Yusuf Leblebici, Ömer Cogal

A multi-camera hemispherical very wide field of view imaging apparatus with omnidirectional illumination capability comprises a cylindrical body (4, 4.a, 4.b), a hemispherical mechanical frame (2) arranged on one end of the cylindrical body (4, 4.a, 4.b), ...

2017

An Insect Eye Inspired Miniaturized Multi-Camera System for Endoscopic Imaging

Yusuf Leblebici, Ömer Cogal

In thiswork,we present aminiaturized high definition vision system inspired by insect eyes, with a distributed illumination method, which can work in dark environments for proximity imaging applications such as endoscopy. Our approach is based on modeling ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Multi-Camera Platform for Panoramic Real-Time HDR Video Construction and Rendering

Yusuf Leblebici, Vladan Popovic, Kerem Seyid, Ömer Cogal, Eliéva Arlette Pignat

High dynamic range (HDR) images are usually obtained by capturing several images of the scene at different exposures. Previous HDR video techniques adopted the same principle by stacking HDR frames in time domain. We designed a new multi-camera platform wh ...

Springer Heidelberg2016

A Real-time Multi-aperture Omnidirectional Visual Sensor Based on Interconnected Network of Smart Cameras

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

Centralized and multi-level implementations of the Panoptic omnidirectional multiaperture visual system were previously presented by the authors, relying on transmission of all camera outputs to a single central processing node for omnidirectional image an ...

Institute of Electrical and Electronics Engineers2015

A Miniaturized Insect Eye Inspired Multi-camera Real-time Panoramic Imaging System

Ömer Cogal

During the last 50 years miniaturization became a key element in human history, since it opens doors for manufacturing new devices that enhances the quality of human life. Camera and imaging systems are following this miniaturization trend as well. Meanwhi ...

EPFL2015

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

Spherical Panorama Construction using Multi Sensor Registration Priors and Its Real-time Hardware

Yusuf Leblebici, Vladan Popovic, Ömer Cogal

2013

FireBird: PowerPC e200 Based SoC for High Temperature Operation

Thomas Maeder, Yusuf Leblebici, Pascal Andreas Meinerzhagen, Radisav Cojbasic, Andreas Peter Burg, Conor Joseph Slater, Ömer Cogal, Carl Christian Sten Dominic Senning

PowerPC Architecture microcontrollers are commonly used in embedded applications. In this work we present FireBird, the first PowerPC based SoC for reliable operation beyond 200C. It is a significant challenge to design SoCs for reliable operation at high ...

2013

Hemispherical Multiple Camera System for High Resolution Omni-Directional Light Field Imaging

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

Inspiration from light field imaging concepts has led to the construction of multi-aperture imaging systems. Using multiple cameras as individual apertures is a topic of high relevance in the light field imaging domain. The need for wide field-of-view (FOV ...

Institute of Electrical and Electronics Engineers2013