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Research and DSP Implementation of H.264 in the Real-time Video Surveillance

Author: ChenGaoTian
Tutor: GuoWei
School: Hebei Normal
Course: Applied Computer Technology
Keywords: H.264 DaVinci technology Motion Estimation Transplantation optimize Real - time video surveillance
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 72
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Abstract

H.264 is a video compression coding standard MPEG and VCEG joint development, and its performance is much higher than the earlier MPEG-4 and H.263 encoding, ITU-T in 2003 through international formally promulgated. H.264 the efficient coding efficiency and network affinity, H.264 algorithm is extremely complex, encoding longer, therefore, how to reduce the computational complexity, improve the encoding speed is the key to achieve real-time encoder. In addition, due to the H.264 encoding involves calculation is very large, ordinary microprocessors difficult to meet real-time requirements of the coding, the researchers used the DSP to implement H.264 video encoder has important practical significance. Serious study on the basis of the existing video coding standard H.264 key technologies from the motion estimation search algorithm and H.264 encoder DSP implementation and optimization of several aspects of the study, and given a final optimization results. Motion estimation is one of the most critical technologies for video encoding, and the calculation amount in the account for a large proportion of the total amount of calculation in the encoder, to achieve 70% -80%, and therefore the motion estimation improvements can greatly improve the efficiency of the encoder. Estimated sports-depth analysis of the focus on the video coding standard block matching motion estimation techniques based on a 1/4 pixel-MPDFS (Quick Search) algorithm based on the direction of the maximum possible fast search algorithm. The main idea of ??the algorithm is based on the pixels of different search direction optimal matching point probability, significantly reduce the number of search points, thereby increasing search speed. And MPDFS algorithm simulation experiment, the experimental results show that, this article MPDFS algorithm 20% -30% less than full search algorithm for motion estimation. Improved H.264 encoding algorithm is then transplanted to the the DM6446 DSP platform based on DaVinci technology, the x264 as the original model of transplantation. Original x264 encoding source based on targeted crop, modify, for example, change the data type, data alignment and variable initialization, adjust the variable access ways and storage space allocation, and eventually transferred to the DSP running on the platform. Algorithm optimization is the focus of the real-time video encoding, this paper based on the the DM6446 DSP hardware characteristics of its structure, and to draw on common optimization techniques for embedded systems, the code running water design, and data packing, reasonable allocation of the cache, EDMA3 and key module linear assembly to achieve a series of optimized methods x264 encoding. Finally, after the x264 encoding optimization test, the test results show that video coding to achieve real-time requirements, to meet the needs of real-time video surveillance.

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