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74 Submissions in this community.

Recent Submissions
GPGPU workload characteristics and performance analysis

Lal, Sohan; Lucas, Jan; Andersch, Michael; Álvarez-Mesa, Mauricio; Elhossini, Ahmed; Juurlink, Ben (2014)

GPUs are much more power-efficient devices compared to CPUs, but due to several performance bottlenecks, the performance per watt of GPUs is often much lower than what could be achieved theoretical...

Nexus#: a distributed hardware task manager for task-based programming models

Dallou, Tamer; Engelhardt, Nina; Elhossini, Ahmed; Juurlink, Ben (2015)

In the era of multicore systems, it is expected that the number of cores that can be integrated on a single chip will be 3-digit. The key to utilize such a huge computational power is to extract th...

Low-complexity VBR controller for spatial-CGS and temporal scalable video coding

Sanz-Rodríguez, Sergio; Díaz-de-María, Fernando; Rezaei, Mehdi (2009)

This paper presents a rate control (RC) algorithm for the scalable extension of the H.264/AVC video coding standard. The proposed rate controller is designed for real-time video streaming with buff...

Improving the parallelization efficiency of HEVC decoding

Chi, Chi Ching; Álvarez-Mesa, Mauricio; Juurlink, Ben; George, Valeri; Schierl, Thomas (2012)

In this paper we present a new parallelization approach for HEVC decoding called Overlapped Wavefront (OWF). It is based on wavefront processing and improves its parallelization efficiency by allow...

Low-complexity motion-based saliency map estimation for perceptual video coding

Mejía-Ocaña, Ana Belén; de-Frutos-López, Manuel; Sanz-Rodríguez, Sergio; del-Ama-Esteban, Óscar; Peláez-Moreno, Carmen; Díaz-de-María, Fernando (2011)

In this paper, a low-complexity motion-based saliency map estimation method for perceptual video coding is proposed. The method employs a camera motion compensated vector map computed by means of a...

HEVC performance and complexity for 4K video

Bross, Benjamin; George, Valeri; Álvarez-Mesa, Mauricio; Mayer, Tobias; Chi, Chi Ching; Brandenburg, Jens; Schierl, Thomas; Marpe, Detlev; Juurlink, Ben (2013)

The recently finalized High-Efficiency Video Coding (HEVC) standard was jointly developed by the ITU-T Video Coding Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group (MPEG) to impro...

How a single chip causes massive power bills

Lucas, Jan; Lal, Sohan; Andersch, Michael; Álvarez-Mesa, Mauricio; Juurlink, Ben (2013)

Modern GPUs are true power houses in every meaning of the word: While they offer general-purpose (GPGPU) compute performance an order of magnitude higher than that of conventional CPUs, they have a...

High performance memory accesses on FPGA-SoCs

Göbel, Matthias; Chi, Chi Ching; Álvarez-Mesa, Mauricio; Juurlink, Ben (2015)

FPGA-SoCs like Xilinx's Zynq-7000 and Altera's Generation 10 SoCs provide an integrated platform for HW/SW-co design applications. Computationally complex tasks can be implemented in the programmab...

A predictor-based power-saving policy for DRAM memories

Thomas, Gervin; Chandrasekar, Karthik; Åkesson, Benny; Juurlink, Ben; Goossens, Kees (2012)

Reducing power/energy consumption is an important goal for all computer systems, from servers to battery-driven hand-held devices. To achieve this goal, the energy consumption of all system compone...

An integrated hardware-software approach to task graph management

Engelhardt, Nina; Dallou, Tamer; Elhossini, Ahmed; Juurlink, Ben (2014)

Task-based parallel programming models with explicit data dependencies, such as OmpSs, are gaining popularity, due to the ease of describing parallel algorithms with complex and irregular dependenc...

A simplified subjective video quality assessment method based on signal detection theory

de-Frutos-López, Manuel; Mejía-Ocaña, Ana Belén; Sanz-Rodríguez, Sergio; Peláez-Moreno, Carmen; Díaz-de-María, Fernando; Pizlo, Zygmunt (2012)

A simplified protocol and associated metrics based on Signal Detection Theory (SDT) for subjective Video Quality Assessment (VQA) is proposed with the aim of filling the gap existing between the la...

Hardware-based task dependency resolution for the StarSs programming model

Dallou, Tamer; Juurlink, Ben (2012)

Recently, several programming models have been proposed that try to relieve parallel programming. One of these programming models is StarSs. In StarSs, the programmer has to identify pieces of code...

A case for hardware task management support for the StarSS programming model

Meenderinck, Cor; Juurlink, Ben (2010)

StarSS is a parallel programming model that eases the task of the programmer. He or she has to identify the tasks that can potentially be executed in parallel and the inputs and outputs of these ta...

A rate control algorithm for HEVC with hierarchical GOP structures

Sanz-Rodríguez, Sergio; Schierl, Thomas (2013)

In this paper a buffer-constrained rate control (RC) algorithm for High Efficiency Video Coding (HEVC) with hierarchical group of pictures structures is proposed. Specifically, a quantization param...

A low-complexity parallel-friendly rate control algorithm for ultra-low delay high definition video coding

Sanz-Rodríguez, Sergio; Mayer, Tobias; Álvarez-Mesa, Mauricio; Schierl, Thomas (2013)

Ultra-low delay high definition (HD) video coding applications such as video conferencing demand, first, low-complexity video encoders able to support multi-core framework for parallel processing a...

Adaptive multi-pattern fast block-matching algorithm based on Motion Classification techniques

González-Díaz, Iván; de-Frutos-López, Manuel; Sanz-Rodríguez, Sergio; Díaz-de-María, Fernando (2007)

Motion estimation is the most time-consuming subsystem in a video codec. Thus, more efficient methods of motion estimation should be investigated. Real video sequences usually exhibit a wide-range ...

A two-level sliding-window VBR controller for real-time hierarchical video coding

de-Frutos-López, Manuel; del-Ama-Esteban, Óscar; Sanz-Rodríguez, Sergio; Díaz-de-María, Fernando (2010)

In this paper, a novel rate control algorithm for real-time VBR hierarchical video coding is proposed. The algorithm works at two levels that are called long- and short-term levels. The long-term l...

A Cauchy-density-based rate controller for H.264/AVC in low-delay environments

del-Ama-Esteban, Óscar; Sanz-Rodríguez, Sergio; de-Frutos-López, Manuel; Díaz-de-María, Fernando (2009)

The accuracy of the Cauchy probability density function for modeling of the discrete cosine transform coefficient distribution has already been proved for the frame layer of the rate control subsys...

A rate control algorithm for low-delay H.264 video coding with stored-B pictures

Sanz-Rodríguez, Sergio; de-Frutos-López, Manuel; González-Díaz, Iván; Cid-Sueiro, Jesús (2007)

A rate control (RC) algorithm for H.264 video coding with stored-B (SB) pictures is proposed for low-delay applications. Different models for P and SB pictures are defined for a better QP and MAD e...

Optimizing HEVC CABAC decoding with a context model cache and application-specific prefetching

Habermann, Philipp; Chi, Chi Ching; Álvarez-Mesa, Mauricio; Juurlink, Ben (2015)

Context-based Adaptive Binary Arithmetic Coding is the entropy coding module in the most recent JCT-VC video coding standard HEVC/H.265. As in the predecessor H.264/AVC, CABAC is a well-known throu...