CN1457603A - 检测在信息信号中多个水印的方法和装置 - Google Patents

检测在信息信号中多个水印的方法和装置 Download PDF

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CN1457603A
CN1457603A CN02800287A CN02800287A CN1457603A CN 1457603 A CN1457603 A CN 1457603A CN 02800287 A CN02800287 A CN 02800287A CN 02800287 A CN02800287 A CN 02800287A CN 1457603 A CN1457603 A CN 1457603A
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CN1225913C (zh
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M·J·J·J·B·梅斯
A·A·C·M·卡尔克
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8358—Generation of protective data, e.g. certificates involving watermark
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/005—Robust watermarking, e.g. average attack or collusion attack resistant
    • G06T1/0071—Robust watermarking, e.g. average attack or collusion attack resistant using multiple or alternating watermarks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
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    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32267—Methods relating to embedding, encoding, decoding, detection or retrieval operations combined with processing of the image
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32288—Multiple embedding, e.g. cocktail embedding, or redundant embedding, e.g. repeating the additional information at a plurality of locations in the image
    • H04N1/32299—Multiple embedding, e.g. cocktail embedding, or redundant embedding, e.g. repeating the additional information at a plurality of locations in the image using more than one embedding method
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    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
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    • H04N1/32304—Embedding different sets of additional information
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
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Abstract

给出的多媒体内容有两种(有可能是不同类型的)水印，把这两种信息都恢复的自然的方法是独立地使用两个检测器。在几何条件的恢复(例如去除缩放)是水印检测的一个组成部分的情况下，这意味着几何条件的恢复在两个检测中是重复的。特别是，综合检测会变得不必要的复杂。本发明为这个问题提供一种解决方案。第一水印检测器使几何条件恢复参数能为第二检测器所利用，由此减少了综合检测的复杂性。

Description

检测在信息信号中多个水印的方法和装置
发明领域
本发明涉及用于检测信息信号中的多个水印的方法和装置，该装置包括检测第一水印用的第一水印检测器和检测第二水印的第二水印检测器。
发明背景
在本技术领域中，已知具有用于在信息(例如视频、音频)信号中嵌入水印的各种方法，以及相应地检测所述水印的方法。
国际专利申请WO99/45705公开了第一种现有技术的方法。在这一方法中，通过将一个小尺寸的基本水印图形在整个视频图象的范围内不断进行重复，从而将水印嵌入到视频信号中。这种“铺瓦(tiling)”操作允许水印检测过程在相对较小的空间中搜索水印并改进检测的可靠性。数据的有效负载是被编码在基本水印瓦片中的。
国际专利申请WO99/12321公开了第二种已知的嵌入和检测方法。在这个现有技术的方法中水印的不同的子图形被嵌入到多个图象块中被选中的一些块中，该图象就是被划分成这些块的。
当前的设想就是合并这两种不同的水印嵌入方法(尽管并不一定就是上面所说的两种方法)。一种同时恢复这两种水印的直截了当的方法是分别采用第一和第二水印检测器。这意味着要重复两个检测器共同所承担的某些任务。因此，综合的检测会变得不必要地复杂和昂贵。
发明目的和概要
本发明的一个目的是减小上述缺点。
为此，一种用于检测信息信号中多个水印的方法的特征在于，它包括这样的步骤：从信息信号中恢复一个参数，该参数是在检测水印时所需要的，并且将该参数应用到第一和第二检测器。由此将明显地减小复合检测的复杂性。
一个典型和重要的参数是视频图象的几何条件。大多数水印技术不能阻止图形的几何失真。诸如平移、缩放、旋转、或拉伸等处理破坏了被处理的图象和所加水印之间的相关性。例如，上面所说的现有技术的水印检测器能阻止平移，但如果图象已经过缩放、旋转或拉伸时它们就缺乏检测水印的能力。有鉴于此，已经建议对推测的图象进行预处理以便去除这些处理(缩放、旋转、拉伸)，这些处理是在所述推测的图象被加上水印之后对图象施加的。在申请人的非预先公布的欧洲专利申请EP 00/09087(PHN17,655)中，建议要确定水印图形的周期性并且这样地来处理该推测的图象，以便使在被处理的推测的图象中的水印与原始图象中的周期性相匹配。美国专利US-A-5,636,292公开了为此目的而对图象添加上一个分开的校准信号(例如，具有特定频率的正弦波)。通过让第一水印检测器促使几何条件恢复参数能被第二检测器利用，就可以减少综合检测的复杂性。注意：这假设两个水印是在同一原始几何条件下嵌入的，或者是在已知的几何条件差别下嵌入的。
附图简介
图1A和1B原理性地表示分别带有嵌入的第一和第二水印的图象。
图2原理性地表示按照本发明的检测多个水印的装置的实施例。
图3A-3C表示的各个图形可以说明在加水印的图象上分别进行缩放、旋转和剪切的效果。
图4A-4C表示由图2所示的水印检测器的过滤器所提供的相关图形。
实施例的说明
图1A和1B原理性地表示分别带有嵌入的第一和第二水印的图象。第一水印是通过在图象上以一个基本噪声图案W来进行“铺瓦”而得到的。有效负载是以该基本图形来编码的。第二水印是多个(不一定相同的)子图形。有效负载可以以在图象的一些特定的块中存在或不存在这些子图形的形式编码。
图2原理性地表示按照本发明的装置的实施例。该装置包括第一水印检测器10，它在这里假设是在WO99/45705中公开的那种类型。检测器10通过将128×128象素的图象块在缓存器中“折叠”、并将水印W和上述缓存器中的内容进行相关来检测水印W(图1A)。检测器对于图象的平移是不变的。加上了多个水印的信号可以被表示为yi＝xi+wi+vi，这里xi表示原始信号，而wi和vi表示两个不同的水印。下标i表示相对于图象的水印位置。该装置接收带标记的信号yi的已移位的形式zi＝yi-k。正如WO99/45705所公开的，在zi中对wi的检测是由一个“仅仅对称相位匹配过滤器”(Symmetrical Phase Only MatchedFitter)11来进行的。这个过程提供一个加到阈值级12上的判决变量di＝∑iziwi-l，该阈值级检测水印W的存在或不存在。过滤器12还内在地对所有可能的移位l搜索移位k的值。第一水印检测器10将上述值k加到第二水印检测器。在zi中检测第二水印vi的第二检测器就不再需要搜索图象所经受到的平移。它已经可以从wi的检测中得到。检测器20包括一个处理电路21，在本实施例中它在常规的检测22之前就将图象移位矢量k。在这个实施例中，加到第二检测器的参数表示同步信息。
在该装置的第二实施例中，第一水印检测器使第二检测器能够使用仿射转换的各个参数，这是在嵌入时为了使图象恢复到它的原始几何条件所需要的。图3A-3C表示缩放、旋转和剪切分别对具有水印W的图象的效果。图4A-4C表示在本实施例中水印检测器10的过滤器11所提供的相关图形。表示缩放、旋转和剪切的两个参数k1和k2现在被加到第二检测器20的处理单元21上以去除图象所经受过的操作。另一种选择方案是，参数k1和k2被用来使第一和/或第二参考水印经受到相同的缩放、旋转或剪切操作以使图象和参考水印重新得到对准。
发明概要：给出的多媒体内容有两种(有可能是不同类型的)水印，使这两种信息都恢复的自然的方法是独立地使用两个检测器。在几何条件的恢复(例如去除缩放)是水印检测的一个组成部分的情况下，这意味着几何条件的恢复在两个检测中是重复的。特别是，综合检测会变得不必要地复杂。本发明为这个问题提供一种解决方案。第一水印检测器使几何条件恢复参数能为第二检测器所利用，由此减少了综合检测的复杂性。

Claims (5)

1.用于检测在信息信号中的多个水印的装置，包括用于检测第一水印的第一水印检测器和用于检测第二水印的第二水印检测器，其特征在于，该装置包括参数恢复装置，用于从信息信号中恢复一个参数，该参数是为了检测水印所需要的，并且用于将上述参数应用到第一和第二检测器。
2.如权利要求1所要求的装置，其中上述的参数恢复装置是包含在第一水印检测器中的，并且第一水印检测器被安排成可将恢复的参数应用到第二水印检测器。
3.如权利要求1或2所要求的装置，其中上述参数识别信息信号的几何条件。
4.如权利要求1或2所要求的装置，其中上述参数表示同步信息。
5.检测在信息信号中的多个水印的方法，包括的步骤为：使用第一水印检测器以检测第一水印和使用第二水印检测器以检测第二水印，其特征在于，该方法包括从信息信号恢复一个为了检测水印所需要的参数、并将上述参数应用到第一和第二检测器的步骤。
CNB028002873A 2001-02-13 2002-02-11 检测在信息信号中多个水印的方法和装置 Expired - Fee Related CN1225913C (zh)

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CN102842309A (zh) * 2008-03-14 2012-12-26 弗劳恩霍夫应用研究促进协会 将水印嵌入信息表示中的嵌入器、检测信息表示中的水印的检测器和方法

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JP2007047873A (ja) 2005-08-05 2007-02-22 Matsushita Electric Ind Co Ltd 復号化装置

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JP4064506B2 (ja) * 1997-09-17 2008-03-19 パイオニア株式会社 電子透かし重畳方法及び検出方法並びに装置
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CN102842309A (zh) * 2008-03-14 2012-12-26 弗劳恩霍夫应用研究促进协会 将水印嵌入信息表示中的嵌入器、检测信息表示中的水印的检测器和方法
CN102842309B (zh) * 2008-03-14 2014-12-31 弗劳恩霍夫应用研究促进协会 将水印嵌入信息表示中的嵌入器、检测信息表示中的水印的检测器和方法

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