中华视频网 - h_264压缩性能和应用分析.htm

关于h.264的一些论文

                              lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                              face="Times New Roman">&nbsp;&nbsp;&nbsp; 
                              </FONT></SPAN></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正是采用了这样一些切实有效的技术方法，</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">才具有了前所未有的高压缩效率，在相同的图像质量下所许的码流量更低，</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.263</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">MPEG-2</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">MPEG-4</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的码率节省率比较如图</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">1</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN><SPAN 
                              lang=EN-US><o:p></o:p></SPAN></FONT></P>
                              <P class=MsoNormal 
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                              lang=EN-US><o:p><FONT face="Times New Roman" 
                              size=3>&nbsp;</FONT></o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
                              lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                              face="Times New Roman">&nbsp;&nbsp;&nbsp; 
                              </FONT></SPAN></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在相同的图像质量下，</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所需码率约为</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">MPEG-2</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">36%</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.263</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">51</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">％、</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">MPEG-4</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">61</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">％，并且随着今后实现优化性工作做得更好，其压缩性能方面的优势将更为突出。这种高压缩效率可以给视频实时通信、数字广播电视、视频存储等应用带来很多好处，提高人们的视频欣赏质量。当然，与这种高压缩效率相伴的是</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">需要较高的实现复杂度。与</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">MPEG-2</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相比，虽然</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的压缩性能提高一倍以上，</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的计算复杂度也要提高两倍以上。</SPAN></FONT></P>
                              <P class=MsoNormal 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></SPAN></FONT>&nbsp;</P><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
                              lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                              face="Times New Roman">&nbsp;&nbsp;&nbsp; 
                              </FONT></SPAN></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三、</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">应用情况</SPAN><SPAN 
                              lang=EN-US><o:p></o:p></SPAN></FONT></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><SPAN 
                              lang=EN-US><o:p><FONT face="Times New Roman" 
                              size=3>&nbsp;</FONT></o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
                              lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                              face="Times New Roman">&nbsp;&nbsp;&nbsp; 
                              </FONT></SPAN></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标准中增加了一个网络提取层</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">NAL</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN 
                              lang=EN-US><FONT face="Times New Roman">Network 
                              Abstraction Layer</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），考虑到了与具体应用网络的连接和接口问题。下面将分</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">3</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个方面分别简单介绍</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在视频通信领域、数字广播电视领域和视频存储播放领域的应用情况。</SPAN><SPAN 
                              lang=EN-US><o:p></o:p></SPAN></FONT></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><SPAN 
                              lang=EN-US><o:p><FONT face="Times New Roman" 
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                              <P class=MsoNormal 
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                              lang=EN-US><FONT face="Times New Roman"><SPAN 
                              style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
                              </SPAN>1.</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在视频通信领域中的应用</SPAN><SPAN 
                              lang=EN-US><o:p></o:p></SPAN></FONT></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><SPAN 
                              lang=EN-US><o:p><FONT face="Times New Roman" 
                              size=3>&nbsp;</FONT></o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN 
                              lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                              face="Times New Roman">&nbsp;&nbsp;&nbsp; 
                              </FONT></SPAN></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是在</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.26L</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的已有成果基础上由</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">JVT</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">完成标准最后制定的，而</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.26L</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先就是针对视频实时通信应用的，例如，会议电视、可视电话等应用，因此，</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在视频实时通信领域首先得到了应用，到</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">2004</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">2</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月为止，国外声称已经可以提供基于</SPAN><SPAN 
                              lang=EN-US><FONT 
                              face="Times New Roman">H.264</FONT></SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hans