1,721,055 research outputs found
Low Complexity, High Quality Digital Architectures for H.264/AVC and HEVC Applications
No full textH.264/AVC is currently the most commonly utilized video coding format because of its high coding efficiency compared to its predecessors. Video coding is achieved by exploiting temporal and spatial redundancies and Motion Estimation (ME) is one of the main tools employed for eliminating temporal redundancies. It is the most critical and time consuming tool in the whole encoder and typically requires 60-80% of the total computational time during the encoding process. One of the major work in this thesis is focused on implementation of low complexity block matching fast search motion estimation accelerators on different platforms, i.e. FPGA/ASIC and on GPU, done by our collaborative group. Similarly, the ASIC implemen- tation for motion estimation of Multi-View Coding (MVC) extension of H.264 is also the part of thesis. HEVC, the brand-new video coding standard addresses high efficient video coding. One of the tools employed to improve coding efficiency is the Discrete-Time Cosine Transform (DCT) with different transform sizes. In video compression, the DCT is widely used because it compacts the image energy at the low frequencies, making easy to discard the high frequency components. The second major part of the thesis is focused on the hardware implementation of the N-point, multiplierless DCT architecture for HEVC standar
N Point DCT VLSI Architecture for Emerging HEVC Standard
No full textThis work presents a flexible VLSI architecture to compute the N-point DCT. Since HEVC supports different block sizes for the computation of the DCT, that is, 4 × 4 up to 3 2 × 3 2, the design of a flexible architecture to support them helps reducing the area overhead of hardware implementations. The hardware proposed in this work is partially folded to save area and to get speed for large video sequences sizes. The proposed architecture relies on the decomposition of the DCT matrices into sparse submatrices in order to reduce the multiplications. Finally, multiplications are completely eliminated using the lifting scheme. The proposed architecture sustains real-time processing of 1080P HD video codec running at 150 MH
Parallel Rate-Distortion Optimised Fast Motion Estimation Algorithm for H.264/AVC using GPU
No full textVLSI implementation of 16-point DCT for H.265/HEVC using walsh hadamard transform and lifting scheme
No full textParallel H.264/AVC Fast Rate-Distortion Optimized Motion Estimation using Graphics Processing Unit and Dedicated Hardware
Full text linkHeterogeneous systems on a single chip composed of CPU, Graphical Processing Unit (GPU), and Field Programmable Gate Array (FPGA) are expected to emerge in near future. In this context, the System on Chip (SoC) can be dynamically adapted to employ different architectures for execution of data-intensive applications. Motion estimation is one such task that can be accelerated using FPGA and GPU for high performance H.264/AVC encoder implementation. In most of works on parallel implementation of motion estimation, the bit rate cost of motion vectors is generally ignored. On the contrary, this paper presents a fast rate-distortion optimized parallel motion estimation algorithm implemented on GPU using OpenCL and FPGA/ASIC using VHDL. The predicted motion vectors are estimated from temporally preceding motion vectors and used for evaluating the bit rate cost of the motion vectors simultaneously. The experimental results show that the proposed scheme achieves significant speedup on GPU and FPGA, and has comparable ratedistortion performance with respect to sequential fast motion estimation algorith
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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