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State-of-the-art solutions to optical flow fail to jointly offer high density flow estimation, low power consumption and real time operation, rendering them unsuitable for embedded applications. Joint hardware-software scalability at run-time is crucial to achieve these conflicting requirements in one device. This paper therefore presents a scalable Lucas-Kanade optical flow algorithm, together with...
Flexible channel spacing for high spectral efficiency is investigated using a real-time 100GbE transponder. 40% better spectral efficiency than current 100G systems can be achieved with a 2,200-km transmission distance by reducing the channel spacing.
Development of optical sensors possessing a continuous field of view provides forming a number of informative features of the optical signal as an output signal of the sensor. These sensors allow both the sensor operating in real time and the feasibility of designing an analog processor based on the sensor array that combines optical signal recording with a new signal processing technique. They operate...
The proposed work presents a highly parallel architecture for motion estimation. Our system implements the well-known Lucas and Kanade algorithm with the multi-scale extension for the computation of large motion estimations in a dedicated device [field-programmable gate array (FPGA)]. Our system achieves 270 frames per second for a 640 480 resolution in the best case of the mono-scale implementation...
We propose a translucent elastic optical network based on a virtualized elastic regenerator. Using a real-time 128-Gb/s spectrum-selective subchannel regenerator, we verify the concept through mixed-rate superchannel regeneration and frequency-slot merger with spectrum conversion.
In recent years, many dense optical flow algorithms have been presented. Besides the actual result, the confidence of the result is of uttermost importance for safety-critical applications using flow. We focus on the determination of the confidence of optical flow.
Vignetting is one of the most common problem that may affect digital imaging. The effect becomes particularly evident when images are stitched together to increase the camera's field of view (e.g., when building a mosaic), where it can lead to errors in automatic analyses. To correct the effect, the most common approach is to acquire an empty field image in advance that is used later to perform a...
We present a method, scalable to 1Tb/s transmission systems, of performing electronic lookup on asynchronous 40Gb/s burst mode channels to facilitate real-time end-to-end interoperability between legacy 100MbE networks and 40Gb/s optical label switched networks.
This paper reviews the reconfiguration capabilities of a real-time compact optronic SAR processor in order to adapt for changes in altitude and look angles of a SAR system in flight, either airborne or space-based. The optronic processor can be reconfigured instantaneously making it suitable for all application requiring real-time SAR imagery despite modification of flight and orbit parameters. Moreover...
Magnetic resonance imaging (MRI) allows continuous temperature mapping inside the human body and is thus a promising tool to guide thermal therapies. For abdominal organs, a real time motion compensation is required to allow quantitative temperature measurements and to permit retro-active control of the heating device. Although optical flow based algorithms have shown promise for this role, intensity...
Real time, error free 4-PAM transmission at 25 Gbps and 30 Gbps over 300 m and 200 m of multimode fiber, respectively, using a VCSEL operating at the wavelength of 850 nm.
A photonic time-stretch enhanced recording oscilloscope enabling real-time burst sampling is realized within an optical switching fabric test-bed. 10-Gb/s eye diagrams are captured with the high-speed digitizer, showcasing the potential for real-time cross-layer network optimization.
Atmospheric distortion is a problem that affects a broad range of optical sensors in both the visible-light and infrared spectra. This phenomenon is particularly problematic for sensors that acquire image and video data along trajectories that cross strong thermal gradients. We present a restoration algorithm that focuses on motion compensation with control grid interpolation to improve degraded video...
We demonstrate 112Gb/s transmission using PM-QPSK format and FPGA-based real-time digital signal processing. By employing framed processing architecture for polarization demultiplexing and carrier phase estimation, stable operation of error free after FEC and wide frequency offset have been achieved.
This paper introduces a real-time compact optronic SAR processor that has the capability to generate ENVISAT/ASAR image swaths of 100 km × 100 km in 10 seconds exhibiting slant plane sampling distances of 4 meters in azimuth and 1 meter in range. It may be instantaneously reconfigured to process data from any of the 7 ASAR image swath modes. In this respect, numerous SAR image sets may be produced...
We present a method which enables rapid and dense reconstruction of scenes browsed by a single live camera. We take point-based real-time structure from motion (SFM) as our starting point, generating accurate 3D camera pose estimates and a sparse point cloud. Our main novel contribution is to use an approximate but smooth base mesh generated from the SFM to predict the view at a bundle of poses around...
7.5Gb/s real-time end-to-end optical OFDM (OOFDM) transceivers incorporating variable power loading on each individual subcarrier are demonstrated experimentally, for the first time, using a live-optimized RSOA intensity modulator having a modulation bandwidth as narrow as 1GHz. Colourless real-time 16-QAM-encoded OOFDM signal transmission at 7.5Gb/s over 25km SSMF is achieved across the C-band in...
At present, navigation path deviation caused by brain shift is the main factor that affects the accuracy of neurosurgical navigation. A new method of near infrared spectroscopy (NIRS) based neurosurgical navigation is presented in the paper. The correlation between NIRS optical parameters and medical image is used and the gray information of navigation path is regarded as the priori knowledge, the...
The first real-time, record-speed 41.25 Gb/s 8 QAM-OFDM receiver is demonstrated using FPGA-based DSP. Superior upstream WDM-OFDMA-PON performance with variable rate transmission is exhibited over 20 km SSMF and a 1:32 split.
A highest speed 12.1 Gb/s real-time OFDM transmitter is reported with optimized Q-factor (Q=3D22.3 dB). Statistical performance measurements using BER testing prove similar error distributions for 231-1 PRBS data at fibers linear and nonlinear transmission regime.
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