Dissertation > Excellent graduate degree dissertation topics show

The Principle and Design of Deblocking Module in Video Compression Coding

Author: YanKaiHan
Tutor: LiShengHong
School: Shanghai Jiaotong University
Course: Communication and Information System
Keywords: Video codec H.264 Blockiness Deblocking filtering
CLC: TN919.81
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 1
Read: Download Dissertation

Abstract

With the rapid development of the Internet and mobile communications, video processing and transmission of information in the Internet and mobile network technology has become a hot spot of the current information technology in China, the increasingly widespread use of digital video technology in the field of communications and broadcasting. The enormous amount of video information contained in the data, make the video to get a valid application, you must first solve the problem of video compression coding. The mainstream video coding standards such as H.264 and AVS are using block-based hybrid coding algorithm, coding error in the compression will cause significant block effect phenomenon. Deblocking filtering technology can effectively filter out blockiness, thus significantly improve the video effect, is a very important and practical technology. The main research content of this paper is the theory and design of video codec deblocking filter module. The first describes the historical development of the video codec technology with the status quo, a brief introduction predictive coding, transform coding, entropy coding and key deblocking filter several video codec technology, and analyze the basic structure and the work of video codecs principles. Followed by analysis of the causes of the blocking effect, the one from the transform encoding of the intraframe prediction and interframe prediction error, the second is from the discontinuities between the blocks of the motion compensation prediction. Then introduces the primary segment of the deblocking filter, i.e. post-processing to the block filter and loop deblocking filter, wherein the loop deblocking filter for adaptive, to save the frame memory and the decoder complexity is low, H.264 and AVS standards were adopted. After that, on the basis of the existing design, put forward their own deblocking filter design based on the H.264 standard. According to the functional needs, the proposed deblocking filter is divided into filter the total control unit, sample acquisition module, a macro block cache module, a macro block output interface module, the sample point to the row cache module, FIR filter, the write line to the cache module, the parameter cache module parameter line cache module boundary strength parameters for the module and boundary strength calculation module 11 modules. The design innovation and improvement include: First, the module functions divided more clear and specific, and reduce the complexity of the hardware implementation; second is to use a reasonable form of data organization and storage order conversion, improve output efficiency; three improved filtering algorithm is used to re-arrange the filter order, reduce the number of visits of the SRAM; through the rational use of the resources of local SRAM, greatly reduce the bus bandwidth demand, improve processing efficiency. The simulation results show that the the deblocking filter function correct image blockiness largely elimination after loop filter, the image quality has been significantly improved. Finally, the prospect of the deblocking filtering technology future research directions.

Related Dissertations

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
© 2012 www.DissertationTopic.Net Mobile