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首页> 外文学位 >A discrete wavelet transform based low complexity H.264 encoder for high bit rate applications.
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A discrete wavelet transform based low complexity H.264 encoder for high bit rate applications.

机译：基于离散小波变换的低复杂度H.264编码器，适用于高比特率应用。

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摘要

Multimedia applications have become an integral part of our daily life through their use in mobile communications, video conferencing, entertainment and more. Multimedia includes video and audio data transfer, of which video data communication is a more complex process and consumes greater bandwidth. Hence, developing low complexity/low-power methods to transmit, receive and store video data has always been an area of immense research. The state of the art video coding technique is called the H.264 coding standard, proposed by the Joint Video Team [1]. Several methods have been proposed to optimize the complexity of the H.264 coding process with a graceful degradation in video quality. This thesis describes a method for reducing the complexity of the H.264 coding process while maintaining compliance to the existing standard and yielding an acceptable video quality.;The proposed method introduces a pre and post processing block to the H.264 black box which enables identification and classification of important information in a given video frame in the time frequency domain. The entire H.264 coding process is performed only on the highly informative portion of a given video frame, while the motion information extracted from them is used to code the rest of the frame. This enables the user to bypass some of the time consuming and complex operations while coding the less informative content of the frame. This time-frequency domain based approach facilitates the use of spatial domain coding techniques thereby ensuring compliance to the standard. The proposed method is compared to the H.264 standard in terms of PSNR, speed up, bandwidth, area and power. The proposed method can be suitably tuned for both high and low bit rate applications for varying resolutions of the video frame.
机译：通过在移动通信，视频会议，娱乐等领域中的使用，多媒体应用已成为我们日常生活中不可或缺的一部分。多媒体包括视频和音频数据传输，其中视频数据通信是一个更复杂的过程，并且占用更大的带宽。因此，开发低复杂度/低功耗的方法来发送，接收和存储视频数据一直是一个巨大的研究领域。最新的视频编码技术称为H.264编码标准，由联合视频小组[1]提出。已经提出了几种方法来优化H.264编码过程的复杂性，同时降低视频质量。本文介绍了一种在保持符合现有标准并获得可接受的视频质量的同时降低H.264编码过程复杂性的方法。该方法为H.264黑盒引入了预处理和后处理块在时频域中对给定视频帧中的重要信息进行识别和分类。整个H.264编码过程仅在给定视频帧的高信息量部分上执行，而从它们中提取的运动信息用于对其余帧进行编码。这使用户可以在编码帧信息较少的内容时绕开一些耗时且复杂的操作。这种基于时频域的方法有助于空间域编码技术的使用，从而确保符合标准。在PSNR，速度，带宽，面积和功率方面，将所提出的方法与H.264标准进行了比较。所提出的方法可以针对视频帧的分辨率变化的高位速率和低位速率应用进行适当调整。

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  • 作者

    Ravi, Rangarajan Lakshminarasimhan.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2010
  • 页码 91 p.
  • 总页数 91
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

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