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1. 发明申请

WO2004003841A2 DOUBLE WATERMARKING 审中-公开
标题翻译：双水印
公开(公告)号：WO2004003841A2
公开(公告)日：2004-01-08
申请号：PCT/GB0302470
申请日：2003-06-09
申请人： UNIV BRISTOL , WINNE DOMINIQUE ALBERT , BULL DAVID ROGER , CANAGARAJAH CEDRIC NISHAN , KNOWLES HENRY DAVID
发明人： WINNE DOMINIQUE ALBERT , BULL DAVID ROGER , CANAGARAJAH CEDRIC NISHAN , KNOWLES HENRY DAVID
IPC分类号： G06T1/00
CPC分类号： G06T1/00
摘要： A method of characterising attacks used on parts, or all of a digital object (I) into which a first digital watermark has been embedded using a watermarking algorithm to form a digitally watermarked objet (I') is provided. The method comprises the steps of: providing a library of possible attacks, wherein the library contains data relating to the effects of possible attacks on a variety of candidate digital objects; estimating the first digital watermark embedded in the digitally watermarked object (I'); embedding a second watermark into the digitally watermarked object (I') using said watermarking algorithm; estimating the second watermark embedded in the digitally watermarked object (I'); and determining the type of attack used by comparing the estimates of the first and second watermarks with the contents of the library of possible attacks.
摘要翻译：本发明提供了一种用于对部件或全部数字对象（I）进行特征化攻击的方法，其中使用水印算法嵌入了第一数字水印以形成数字水印的对象（I'）。该方法包括以下步骤：提供可能的攻击库，其中所述库包含与可能的攻击对各种候选数字对象的影响有关的数据; 估计嵌入在数字水印对象（I'）中的第一数字水印; 使用所述水印算法将第二水印嵌入所述数字水印对象（I'）中; 估计嵌入在数字水印对象（I'）中的第二水印; 以及通过将第一和第二水印的估计与可能攻击的库的内容进行比较来确定所使用的攻击类型。

2. 发明申请

WO02089056A8 WATERMARKING WITH COEFFICIENT PREDISTORTION 审中-公开
标题翻译：使用系统预测进行水印
公开(公告)号：WO02089056A8
公开(公告)日：2003-03-13
申请号：PCT/GB0201845
申请日：2002-04-23
申请人： UNIV BRISTOL , BULL DAVID ROGER , CANAGARAJAH CEDRIC NISHAN , WINNE DOMINIQUE , KNOWLES HENRY DAVID
发明人： BULL DAVID ROGER , CANAGARAJAH CEDRIC NISHAN , WINNE DOMINIQUE , KNOWLES HENRY DAVID
IPC分类号： G06T1/00 , H04N1/32 , H04N7/26 , H04N7/24
CPC分类号： H04N19/467 , G06T1/0028 , G06T1/0042 , G06T2201/0052 , G06T2201/0083 , H04N1/32154 , H04N1/3216 , H04N1/32165 , H04N1/32176 , H04N1/32187 , H04N1/32277 , H04N1/32331 , H04N19/48 , H04N19/90 , H04N2201/3233 , H04N2201/327
摘要： The present invention provides a scheme for inserting and extracting an invisible fragile watermark in an image/video sequence, in order to verify whether a watermarked image has been tampered with. According to one aspect of the invention, there is provided a method of watermarking a digital image, comprising: obtaining digital image coefficients; forming a plurality of arrays of image coefficients, each array comprising a predetermined number of image coefficients, the image coefficients comprising coefficients with first, second and third values; and for each array determining a binary value as a watermark component bit; determining a quantization parameter, based on the separation between the first and the second values; selecting a plurality of values to represent ones and zeros, the separation between successive selected values being determined on the basis of the quantization parameters; and modifying the third value, such that it takes the closest one of the selected values which represents the determined watermark component bit. According to another aspect of the present invention, there is provided a method of extracting a watermark embedded in that way.
摘要翻译：本发明提供了一种用于在图像/视频序列中插入和提取不可见脆弱水印的方案，以便验证水印图像是否被篡改。根据本发明的一个方面，提供了一种对数字图像进行水印处理的方法，包括：获得数字图像系数; 形成多个图像系列阵列，每个阵列包括预定数量的图像系数，所述图像系数包括具有第一，第二和第三值的系数; 并且对于确定二进制值作为水印分量比特的每个阵列; 基于第一和第二值之间的间隔来确定量化参数; 选择多个值以表示零和零，所述连续选择值之间的间隔是基于所述量化参数确定的; 并且修改第三值，使得其采用表示确定的水印分量比特的所选值中最接近的一个。根据本发明的另一方面，提供了以这种方式提取嵌入的水印的方法。

3. 发明申请

WO2002089057A1 WATERMARKING USING REPRESENTATIVE VALUES 审中-公开
标题翻译：使用代表性值的水印
公开(公告)号：WO2002089057A1
公开(公告)日：2002-11-07
申请号：PCT/GB2002/001849
申请日：2002-04-23
申请人： UNIVERSITY OF BRISTOL , BULL, David, Roger , CANAGARAH, Cedric, Nishan , WINNE, Dominic , KNOWLES, Henry, David
发明人： BULL, David, Roger , CANAGARAH, Cedric, Nishan , WINNE, Dominic , KNOWLES, Henry, David
IPC分类号： G06T1/00
CPC分类号： H04N19/467 , G06T1/0042 , G06T2201/0052 , G06T2201/0083 , H04N1/32154 , H04N1/3216 , H04N1/32165 , H04N1/32176 , H04N1/32187 , H04N1/32331 , H04N19/48 , H04N19/90 , H04N2201/3233 , H04N2201/327
摘要： The present invention provides a scheme for inserting and extracting an invisible watermark in a image/video sequence, in order to verify whether a watermarked image has been tampered with. According to one aspect of the invention, there is provided a method of watermarking a digital image, comprising: obtaining digital image coefficients; forming a plurality of arrays of image coefficients, each array comprising a predetermined number of image coefficients; selecting a plurality of input values, selected input values each representing binary 0s or 1s; and for each array: determining a binary value as a watermark component bit; calculating a numerical value being representative of the image coefficients; and, if necessary, modifying one or more of the image coefficients, such that the representative numerical value becomes equal to a selected input value which represents the determined watermark component bit. According to other aspects of the invention, there are provided a corresponding method of detecting a watermark, and corresponding hardware and software devices.
摘要翻译：本发明提供了一种用于在图像/视频序列中插入和提取不可见水印的方案，以便验证水印图像是否已被篡改。根据本发明的一个方面，提供了一种对数字图像进行水印处理的方法，包括：获得数字图像系数; 形成多个图像系数阵列，每个阵列包括预定数量的图像系数; 选择多个输入值，所选择的输入值各自表示二进制0s或1s; 并且对于每个阵列：将二进制值确定为水印分量比特; 计算代表图像系数的数值; 并且如果需要，修改一个或多个图像系数，使得代表数值变为等于表示所确定的水印分量比特的所选择的输入值。根据本发明的其他方面，提供了一种检测水印的相应方法，以及对应的硬件和软件设备。

4. 发明申请

WO1993006503A1 ULTRASONIC RANGING DEVICES 审中-公开
标题翻译：超声波测距装置
公开(公告)号：WO1993006503A1
公开(公告)日：1993-04-01
申请号：PCT/GB1992001706
申请日：1992-09-17
申请人： BRITISH NUCLEAR FUELS PLC , UNIVERSITY COLLEGE CARDIFF CONSULTANTS LTD. , BULL, David, Roger , Thomas, Seimon, Marc
发明人： BRITISH NUCLEAR FUELS PLC , UNIVERSITY COLLEGE CARDIFF CONSULTANTS LTD.
IPC分类号： G01S07/52
CPC分类号： G01S15/931 , G01S7/52004 , G01S7/5273
摘要： An ultrasonic ranging device suitable for use as a sensor on a mobile robot, the device comprising a transmitter (9) for transmitting in a scanned fashion a beam of ultrasonic energy over a target region of interest (11), a detector (13, 14) for detecting return ultrasonic energy comprising reflections of the transmitted beam from the target region and a signal processor (17, 19) for enhancing the signal detected by the detector, which processor comprises a correlator (19) for correlating the signal output from the detector with a reference signal wherein the reference signal is a representation of the actual signal which has been produced by that detector when the transmitted beam has reflected at normal incidence from a plane reference target surface of interest, the processor also including a computer store (21) for storing said signal representation and applying the same as a reference signal to said correlator (19) during detection of a signal representing reflection from a target to be detected.
摘要翻译：一种适于在移动机器人上用作传感器的超声波测距装置，该装置包括用于以扫描方式在目标感兴趣区域（11）上传输超声波能量的发射器（9），检测器（13,14）），用于检测包括来自目标区域的发射波束的反射的返回超声能量和用于增强由检测器检测到的信号的信号处理器（17,19），该处理器包括相关器（19），用于将来自检测器的信号输出相关具有参考信号，其中参考信号是当发射光束从感兴趣的平面参考目标表面以法向入射反射时由该检测器产生的实际信号的表示，处理器还包括计算机存储器（21）用于在检测到表示来自目标的反射的信号的检测期间，存储所述信号表示并将其作为参考信号应用于所述相关器（19）被检测。

5. 发明申请

WO1997027671A1 ADAPTIVE FILTERS AND EQUALISERS 审中-公开
标题翻译：自适应滤波器和均衡器
公开(公告)号：WO1997027671A1
公开(公告)日：1997-07-31
申请号：PCT/GB1997000234
申请日：1997-01-27
申请人： UNIVERSITY OF BRISTOL , BULL, David, Roger , NIX, Andrew, Robert , PERRY, Russell
发明人： UNIVERSITY OF BRISTOL
IPC分类号： H03H21/00
CPC分类号： H03H21/0012 , H04L25/03057
摘要： An adaptive Decision Feedback Equaliser (DFE) is trained using the Delayed Least Mean Square (DLMS) algorithm. A delay, equal to the feedforward filter length, is introduced in the filter coefficient update, which allows the DFE to be realised as the cascade of a series of modular sections. Additionaly a signed power-of-two number representation is used for the equaliser input data. Using this number representation, all multipliers can be replaced with barrel shifters and adders. Reduced complexity of circuit implementation and improved signal throughput are obtained.
摘要翻译：使用延迟最小均方（DLMS）算法对自适应判决反馈均衡器（DFE）进行训练。在滤波器系数更新中引入了等于前馈滤波器长度的延迟，这允许DFE被实现为一系列模块化部分的级联。对于均衡器输入数据，使用带符号的二次幂数字表示。使用这个数字表示，所有乘法器都可以用桶形移位器和加法器代替。获得电路实现复杂度降低和信号吞吐量提高。

6. 发明申请

WO2006072793A1 VIDEO ERROR CONCEALMENT 审中-公开
标题翻译：视频错误隐藏
公开(公告)号：WO2006072793A1
公开(公告)日：2006-07-13
申请号：PCT/GB2006/000036
申请日：2006-01-06
申请人： PROVISION COMMUNICATION TECHNOLOGIES LIMITED , BULL, David, Roger , AGRAFIOTIS, Dimitris
发明人： BULL, David, Roger , AGRAFIOTIS, Dimitris
IPC分类号： H04N7/68 , H04N7/26 , H04N7/36 , H04N7/34
CPC分类号： H04N19/583 , H04N19/139 , H04N19/176 , H04N19/593 , H04N19/895
摘要： A temporal error concealment is described. A video stream comprises a current frame comprising a lost image region, and a reference frame. The method comprises forming a list of motion vector candidates, the list of motion vector candidates including a set of one or more motion vectors from the current frame and a set of one or more motion vectors from the reference frame; testing each of the motion vector candidates using a matching error measure; selecting a replacement motion vector from the list based on the matching error measures; and using the selected replacement motion vector to conceal the lost image region. A mode selection method is also described. A motion vector is used to identify a motion compensated reference image region in the reference frame. A motion compensated temporal activity of an image region in the current frame is calculated based on a comparison between the image region in the current frame and the motion compensated reference image region in the reference frame. A spatial or temporal error concealment mode is then selected based on the calculated temporal activity.
摘要翻译：描述了时间误差隐藏。视频流包括包括丢失图像区域和参考帧的当前帧。该方法包括形成运动矢量候选的列表，运动矢量候选的列表包括来自当前帧的一个或多个运动矢量的集合和来自参考帧的一个或多个运动矢量的集合; 使用匹配误差测量来测试每个运动矢量候选; 基于匹配误差测量从列表中选择替换运动矢量; 并使用所选择的替换运动矢量来隐藏丢失的图像区域。还描述了模式选择方法。使用运动矢量来识别参考帧中的运动补偿参考图像区域。基于当前帧中的图像区域和参考帧中的运动补偿参考图像区域之间的比较来计算当前帧中的图像区域的运动补偿时间活动。然后基于所计算的时间活动来选择空间或时间错误隐藏模式。

7. 发明申请

WO2004003841A3 IMAGE ATTACK CHARACTERISATION BY DOUBLE WATERMARKING 审中-公开
公开(公告)号：WO2004003841A3
公开(公告)日：2004-01-08
申请号：PCT/GB2003/002470
申请日：2003-06-09
申请人： UNIVERSITY OF BRISTOL , WINNE, Dominique, Albert , BULL, David, Roger , CANAGARAJAH, Cedric, Nishan , KNOWLES, Henry, David
发明人： WINNE, Dominique, Albert , BULL, David, Roger , CANAGARAJAH, Cedric, Nishan , KNOWLES, Henry, David
IPC分类号： G06T1/00
摘要： A method of characterising attacks used on parts, or all of a digital object ( I ) into which a first digital watermark has been embedded using a watermarking algorithm to form a digitally watermarked objet ( I' ) is provided. The method comprises the steps of: providing a library of possible attacks, wherein the library contains data relating to the effects of possible attacks on a variety of candidate digital objects; estimating the first digital watermark embedded in the digitally watermarked object ( I '); embedding a second watermark into the digitally watermarked object ( I ') using said watermarking algorithm; estimating the second watermark embedded in the digitally watermarked object ( I' ); and determining the type of attack used by comparing the estimates of the first and second watermarks with the contents of the library of possible attacks.

8. 发明申请

WO2002089056A1 WATERMARKING WITH COEFFICIENT PREDISTORTION 审中-公开
标题翻译：使用系统预测进行水印
公开(公告)号：WO2002089056A1
公开(公告)日：2002-11-07
申请号：PCT/GB2002/001845
申请日：2002-04-23
申请人： UNIVERSITY OF BRISTOL , BULL, David, Roger , CANAGARAH, Cedric, Nishan , WINNE, Dominic , KNOWLES, Henry, David
发明人： BULL, David, Roger , CANAGARAH, Cedric, Nishan , WINNE, Dominic , KNOWLES, Henry, David
IPC分类号： G06T1/00
CPC分类号： H04N19/467 , G06T1/0028 , G06T1/0042 , G06T2201/0052 , G06T2201/0083 , H04N1/32154 , H04N1/3216 , H04N1/32165 , H04N1/32176 , H04N1/32187 , H04N1/32277 , H04N1/32331 , H04N19/48 , H04N19/90 , H04N2201/3233 , H04N2201/327
摘要： The present invention provides a scheme for inserting and extracting an invisible fragile watermark in an image/video sequence, in order to verify whether a watermarked image has been tampered with. According to one aspect of the invention, there is provided a method of watermarking a digital image, comprising: obtaining digital image coefficients; forming a plurality of arrays of image coefficients, each array comprising a predetermined number of image coefficients, the image coefficients comprising coefficients with first, second and third values; and for each array determining a binary value as a watermark component bit; determining a quantization parameter, based on the separation between the first and the second values; selecting a plurality of values to represent ones and zeros, the separation between successive selected values being determined on the basis of the quantization parameters; and modifying the third value, such that it takes the closest one of the selected values which represents the determined watermark component bit. According to another aspect of the present invention, there is provided a method of extracting a watermark embedded in that way.
摘要翻译：本发明提供了一种用于在图像/视频序列中插入和提取不可见脆弱水印的方案，以便验证水印图像是否被篡改。根据本发明的一个方面，提供了一种对数字图像进行水印处理的方法，包括：获得数字图像系数; 形成多个图像系列阵列，每个阵列包括预定数量的图像系数，所述图像系数包括具有第一，第二和第三值的系数; 并且对于确定二进制值作为水印分量比特的每个阵列; 基于第一和第二值之间的间隔来确定量化参数; 选择多个值以表示零和零，所述连续选择值之间的间隔是基于所述量化参数确定的; 并且修改第三值，使得其采用表示所确定的水印分量比特的所选值中最接近的一个。根据本发明的另一方面，提供了以这种方式提取嵌入的水印的方法。

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