CN1283104C - 在视频中用于同步隐式嵌入的关键字 - Google Patents

在视频中用于同步隐式嵌入的关键字 Download PDF

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CN1283104C
CN1283104C CNB01137926XA CN01137926A CN1283104C CN 1283104 C CN1283104 C CN 1283104C CN B01137926X A CNB01137926X A CN B01137926XA CN 01137926 A CN01137926 A CN 01137926A CN 1283104 C CN1283104 C CN 1283104C
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video
data file
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CN1355652A (zh
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A·M·利马耶
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Tektronix Inc
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Tektronix Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23892Multiplex stream processing, e.g. multiplex stream encrypting involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level

Abstract

通过在音频/视频的帧内隐式嵌入关键字而同步包含元数据和/或控制数据的数据文件与相关音频/视频数据。该关键字指示数据文件的位置和在嵌入的帧后该数据文件要与音频/视频同步被激活的时间。数据文件通过一个替代信道访问并在由关键字指示的时间前保存在缓冲器中。来自数据文件中的元数据为与相关音频/视频同步显示而播放,控制数据中包含的指令与相关音频/视频数据同步执行。

Description

在视频中用于同步隐式嵌入的关键字
技术领域
本发明涉及多媒体系统,更特别说,涉及在视频信号中为同步多媒体数据的播放控制和/或控制数据中的指令的执行而隐式嵌入的关键字。
背景技术
给视频信号加水印越来越多用于传输作为视频信号一部分的甚低速率数据的工具。给视频加水印是为执行音频对视频的延迟补偿而提出,用于指示验证或程序所有权和用于检验视频信号的播放,诸如在广告记录中使用的那样。水印技术在视频信号的活动部分插入甚低速率数据使其不可见,同时仍然具有健壮性,使包含多代压缩编码/解码的视频信号处理能够进行。参见美国专利No.4,969,041,其在1990年11月6日授权给William O’Grady等人,名称为“视频信号中的数据嵌入”和共同未决美国专利申请序号No.08/829,524,其为Daniel Baker等人在1997年3月28日递交、名称为“视频信号中数据的透明嵌入”。
另外还公知使用为传输与视频信号有关的数据的辅助信道,其示于美国专利No.6,075,561,其在2000年6月13日授权给BozidarJanko,名称为“视频参考图像的低占空比(duty cycle)传输”。随着因特网的到来,建议使用因特网作为传输数据的辅助信道。人们期望,当播放在因特网上流过的视频时,可能希望还播放其它数据-称为元数据-它与该视频相关使观众身临其境。还可能希望给接收视频的设备传输控制数据。这一控制数据可用于下面的一种或多种目的:(1)提示一个商业节目;(2)指定该视频要引导去的目的地;(3)控制辅助设备以驱动其它传感提示,诸如驱动特殊的光或声音效果;(4)控制在存储前压缩该视频的参数;等。
然而,使用视频的水印技术来传输元数据在当前是不可能的。元数据的位速率,诸如9600波特,对于水印所能承受的甚低数据速率信道是太高了。直接使用水印技术传输控制数据也许可能也许不可能,取决于随应用变化的数据量。
所出现的问题是当元数据或其它控制数据与视频通过不同信道传输时如何同步它们,使得当由观众观看时元数据相对于视频在适当的点出现,或控制数据相对于视频在适当的点被恢复和使用。
所希望的是当播放视频时同步元数据或控制数据与相关的视频的方法。
发明内容
相应地,本发明提供在视频中隐式嵌入的关键字,它们作为为一个包含元数据和/或控制数据的数据文件的指针和同步信号,使得元数据与视频一起显示和/或在适当时间执行在控制数据中包含的指令。在一个系统的传输端与视频同步产生一个关键字,该关键字与相应数据文件相关。该关键字使用水印技术隐式嵌入视频中一个适当的点处。在接收机,该关键字从视频解码而用于访问包含该数据文件的网络服务器。一旦从数据文件中恢复元数据,则它在由关键字指示的与该视频同步的点与该视频一起显示,或使用控制数据在指定的时间执行一个或者多个辅助功能。对于小的数据文件,这里恢复延迟很小,关键字可能就在与数据文件关联的第一视频帧前几帧,但是对于大的数据文件,关键字可能插入与数据文件关联的第一视频帧前几秒处。当元数据要从数据文件中为观众与视频播放时或者当要执行包含在控制数据中的指令时,关键字既提供检索数据文件的“地址”,也提供离开关键字帧的时间。以这种方式数据文件与视频同步。
本发明提供了一种在接收站同步数据文件与相关的音频/视频数据的方法,包括步骤:
在传输站将一个关键字隐式地嵌入到该音频/视频数据中的有效部分,该数据文件存储在一个网络存储介质中,而该关键字指示该数据文件在该网络存储介质中的位置和相对于其中嵌入了该关键字的一个帧的延迟时间;
将带有嵌入了关键字的音频/视频数据经主信道传输到接收站;
在接收站从音频/视频数据中提取该关键字;
按照由该关键字指示的在网络存储介质中的位置,经与主信道分开的反向信道访问该数据文件;以及
在接收站按照关键字所指示的延迟时间,与相关的音频/视频数据同步使用访问过的数据文件。
结合所附权利要求和附图,阅读下面的详细说明,可以明显看出本发明的目的、优点和其它新颖特征。
附图说明
附图是一个为同步一个数据文件与视频而使用按照本发明的隐式嵌入关键字的系统的方框示意图。
具体实施方式
现在参考附图,视频、音频和一个包含元数据和/或控制数据的相关数据文件输入到一个编辑/制作系统12。从编辑/制作系统12来的输出是流式音频/视频和具有相关关键字的数据文件。该数据文件存储在一个适当的存储设备14中,诸如网络服务器,而关键字与流式音频/视频输入到关键字嵌入系统16,诸如在上面参考的美国专利No.4,969,041和美国专利申请序号No.08/829,524中说明的。当考虑访问数据文件时的延迟应该与音频/视频流同步执行数据文件中的控制指令或播放元数据时,这些关键字具有指示相关数据文件在存储设备14中的位置和用帧数表示的离开关键字嵌入的帧的时间的信息。大的数据文件需要较长的访问时间,所以关键字插入在要使用数据文件的帧的前方较远处,而小的数据文件可以不需要太多的“领先”时间。
具有嵌入的关键字的音频/视频流通过传输信道传输到接收位置,在这里,关键字解码器18从音频/视频流提取关键字并访问一个替代信道20,诸如因特网。来自关键字的信息通过替代信道20传输到存储设备14,数据文件从存储设备传输到关键字解码器18的缓冲器。当从嵌入关键字的帧过去如该关键字指示的数目的帧时,数据文件中的元数据与音频/视频流播放到播放系统22以便与音频/视频流同步。另外可选执行在数据文件的控制数据中包含的指令。播放系统22可以是用户电视机的机顶盒,或者是多媒体计算机,观众可以在这里控制是否观看元数据或只看元数据的一部分。播放系统22还可以是负责实现在控制数据中包含的指令的设备。
这样,本发明提供视频中隐式嵌入的关键字,用于同步包含元数据和/或与音频/视频流相关的控制数据的数据文件,该数据文件由一个替代信道提供,关键字具有当与音频/视频流播放数据文件中的元数据或当执行控制数据中的指令时该数据文件的地址以及时间。

Claims (3)

1.一种在接收站同步数据文件与相关的音频/视频数据的方法,包括步骤:
在传输站将一个关键字隐式地嵌入到该音频/视频数据中的有效部分,该数据文件存储在一个网络存储介质中,而该关键字指示该数据文件在该网络存储介质中的位置和相对于其中嵌入了该关键字的一个帧的延迟时间;
将带有该嵌入了关键字的音频/视频数据经主信道传输到接收站;
在接收站从音频/视频数据中提取该关键字;
按照由该关键字指示的在网络存储介质中的位置,经与主信道分开的反向信道访问该数据文件;以及
在接收站按照关键字所指示的延迟时间,与相关的音频/视频数据同步使用访问过的数据文件。
2.如权利要求1所述方法,其中,该数据文件包括要与相关音频/视频数据同步播放的元数据,所述使用步骤包括为与音频/视频数据同步显示而播放元数据的步骤。
3.如权利要求1所述方法,其中,该数据文件包括要与相关音频/视频数据同步激活的控制数据,所述使用步骤包括为与音频/视频数据同步执行而激活控制数据中包含的指令的步骤。
CNB01137926XA 2000-11-06 2001-11-06 在视频中用于同步隐式嵌入的关键字 Expired - Fee Related CN1283104C (zh)

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CN1355652A (zh) 2002-06-26
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EP1204277A2 (en) 2002-05-08
US6642966B1 (en) 2003-11-04
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ES2328222T3 (es) 2009-11-11
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