公开(公告)号：EP2009918A1

公开(公告)日：2008-12-31

申请号：EP08158107.6

申请日：2008-06-12

申请人： THOMSON Licensing

发明人： Vigouroux, Jean-Ronan ,  Bourdon, Pascal ,  Doyen, Didier

IPC分类号： H04N5/913

CPC分类号： H04N9/3182 ,  G06T1/0028 ,  G06T2201/0051 ,  H04N1/32309 ,  H04N1/54 ,  H04N5/913 ,  H04N2005/91335 ,  H04N2005/91392

摘要： This invention relates to a method to select, in an input image, pixels that can be watermarked by replacing their colour by a metameric colour. It comprises the following steps:
- correct (10) the input image by applying a predetermined gamma law,
- convert (11) the input image into a 'metameric' image in which the colours of the input image pixels are replaced by metameric colours,
- simulate (12) the capture of the input image and of the metameric image by a camcorder in order to generate respectively a captured input image and a captured metameric image,
- determine (13), in a colour space and for each pixel of the input image, the distance between the colour of said pixel in the captured input image and in the captured metameric image, and
- select (14) the pixels of the input image for which the distance is greater than a threshold.
The invention also concerns a watermarking method based on metamerism.

摘要翻译： 本发明涉及一种在输入图像中选择可以通过以同色异色替换其颜色而被加水印的像素的方法。 它包括以下步骤： - 通过应用预定的伽马规律来校正（10）输入图像， - 将输入图像转换（11）成其中输入图像像素的颜色被同色异色替代的“同位体”图像， - 模拟（12）通过摄像机捕获输入图像和同色异体图像，以分别产生捕获的输入图像和捕获的同色异体图像， - 确定（13）在颜色空间和 输入图像，捕获的输入图像中的所述像素的颜色与所捕获的同色异体图像之间的距离，以及 - 选择（14）距离大于阈值的输入图像的像素。 本发明还涉及一种基于同色异体的水印方法。

公开(公告)号：EP1968315A1

公开(公告)日：2008-09-10

申请号：EP07300846.8

申请日：2007-03-05

申请人： Thomson Licensing

发明人： Vigouroux, Jean-Ronan ,  Bourdon, Pascal ,  Doyen, Didier

IPC分类号： H04N5/913 ,  H04N5/74 ,  H04N9/31

CPC分类号： H04N5/913 ,  H04N9/3182 ,  H04N21/478 ,  H04N2005/91392

摘要： The invention relates to a projection system for displaying at least one visual image based on three primary colours, comprising a signal processing unit (11) for converting said visual image into at least a visual image based on four primary colours, a frequency band being associated to each colour primary, first display means (12) for displaying three first primary colours of said visual image on a screen (14) and second display means (13) for displaying at least the fourth primary colour of said visual image on said screen. According to the invention, the system further comprises a notch filter (15) located between said first display means and the screen to attenuate or block at least a portion of the frequencies of at least one of the three first primary colours in the frequency spectrum associated to the fourth primary colour. The spectrum of the first three primary colours and the fourth primary colour are thus disconnected to guarantee more different spectral power distributions for two metamers.
Application to anti-camcorder systems

摘要翻译： 本发明涉及一种用于基于三原色显示至少一个视觉图像的投影系统，包括用于将所述视觉图像转换成至少基于四原色的视觉图像的信号处理单元（11），所述频带相关联 用于在屏幕（14）上显示所述视觉图像的三个第一基色的第一显示装置（12）和用于在所述屏幕上至少显示所述视觉图像的第四基色的第二显示装置（13）。 根据本发明，该系统还包括位于所述第一显示装置和屏幕之间的陷波滤波器（15），用于衰减或阻挡频谱相关联的三个第一原色中的至少一个的频率的至少一部分 到第四原色。 因此，前三原色和第四原色的光谱被断开以保证两个元素的更多不同的光谱功率分布。 适用于反摄像机系统

公开(公告)号：EP1931143A1

公开(公告)日：2008-06-11

申请号：EP06301220.7

申请日：2006-12-06

申请人： Thomson Licensing

发明人： Bourdon, Pascal ,  Thiebaud, Sylvain ,  Doyen, Didier

IPC分类号： H04N5/913

CPC分类号： H04N5/913 ,  H04N2005/91392

摘要： The invention relates to a method for combating the copying of source pictures by means of a camera while they are being displayed, for example using a camcorder in a movie theatre. To this end, it is known, in classical projection systems, to modulate by a carrier wave the brightness of some pixels of the pictures. The frequency of the carrier wave is usually constant and generally half the refresh frequency. The main problem with such systems is that once a pirate has figured out what the modulation frequency is, he can configure his camcorder shutter to filter out this frequency and bypass the anti-camcorder method. According to the invention, the frequency of the carrier is changed at least once throughout the displaying of the sequence pictures or the movie, to defeat all camcorders standards (PAL/NTSC) and shutter configurations.

摘要翻译： 本发明涉及一种在显示时通过相机对源图像进行复制的方法，例如使用电影院中的摄像机。 为此，在经典投影系统中，通过载波调制图像的一些像素的亮度是已知的。 载波的频率通常是恒定的，通常是刷新频率的一半。 这种系统的主要问题是，一旦盗版者已经弄清楚调制频率是什么，他可以配置其摄像机快门来滤除这个频率，并绕过反摄像机方法。 根据本发明，载体的频率在序列图像或电影的显示期间至少改变一次，以抵消所有摄像机标准（PAL / NTSC）和快门配置。

公开(公告)号：EP1814074A1

公开(公告)日：2007-08-01

申请号：EP07101006.0

申请日：2007-01-23

申请人： Thomson Licensing

发明人： Bourdon, Pascal ,  Blonde, Laurent ,  Borel, Thierry

IPC分类号： G06T1/00 ,  H04N5/74 ,  H04N5/913

CPC分类号： H04N5/913 ,  H04N5/74 ,  H04N2005/91392

摘要： The invention discloses a new modulation scheme to prevent illegal copy in movie theaters. None of the existing modulation schemes make the right assumptions to modelize a camcorder device. In such classical schemes, camcorders are always considered as sampling devices without taking into account the effects of shutter speed. The shutter of the camcorder is classically compared to a low-pass filter. As a result, modulation effects can be easily removed by setting up shutter speed to low values (low cutoff frequency). The right mathematical modelization of the shutter effect shows that, in the spectral domain, the behavior of the camcorder is close to a cardinal sine function with a main lobe and sidelobes. Consequently, according to the invention, it is proposed to select a modulation frequency that not only generates visual artifacts once recorded by the camcorder under shutter-free conditions, but that can also generate artifacts despite low shutter speed settings by going through sidelobe of the shutter spectrum.

摘要翻译： 本发明公开了一种防止电影院非法复制的新调制方案。 现有的调制方案都没有制定正确的假设来建模摄像机设备。 在这种经典方案中，摄像机总是被认为是采样设备，而不考虑快门速度的影响。 摄像机的快门与低通滤镜相比是经典的。 结果，通过将快门速度设置为低值（低截止频率），可以容易地消除调制效果。 快门效应的正确数学模型化表明，在光谱域中，摄像机的行为接近具有主瓣和旁瓣的基本正弦函数。 因此，根据本发明，提出了选择不仅在无快门条件下由摄像机记录的视觉伪像的调制频率，而且即使经过快门速度设置，也可以通过快门的旁瓣来产生伪像 光谱。

公开(公告)号：EP2071512B1

公开(公告)日：2017-04-12

申请号：EP08171034.5

申请日：2008-12-09

申请人： Thomson Licensing

发明人： Kervec, Jonathan ,  Bourdon, Pascal ,  Menard, Nicolas

IPC分类号： G06T7/00

CPC分类号： H04N5/142 ,  G06T5/20 ,  G06T2207/20032 ,  G06T2207/20192 ,  H04N7/0135 ,  H04N7/0142

公开(公告)号：EP2887640A1

公开(公告)日：2015-06-24

申请号：EP13306834.6

申请日：2013-12-23

申请人： Thomson Licensing

发明人： Baillard, Caroline ,  Le Clerc, François ,  Bourdon, Pascal

IPC分类号： H04N5/232

CPC分类号： H04N5/23222 ,  H04N5/23219 ,  H04N5/23229

摘要： The invention relates to a guidance method for taking a picture, implemented by an apparatus comprising a display device (DD). According to the invention, the method comprises at least one iteration of :
- obtaining (10) an image representative of a subject to be photographed, called a guidance image (GUI), via an acquisition device (DA);
- comparing (20) of a set (ECGu) of at least one feature of said guidance image, called a guidance feature (CGu), with a corresponding set (ECSO) of at least one desired characteristic (CSO), delivering a comparison result (RESC);

and when said desired characteristic (CSO) differs from said guidance feature (CGu), displaying (30) on said display device (DD) of at least one item of correction information (Icorr) of said guidance image in view of said comparison result (RESC).

摘要翻译： 本发明涉及一种用于拍摄图像的指导方法，该方法由包括显示装置（DD）的装置实现。 根据本发明，所述方法至少包括以下步骤： - 通过采集装置（DA）获得（10）代表被拍摄对象的图像，称为引导图像（GUI）; - 将所述引导图像的至少一个特征（称为引导特征（CGu））的集合（ECGu）与至少一个期望特征（CSO）的对应集合（ECSO）进行比较（20），从而递送比较结果 （RESC）; 并且当所述期望特征（CSO）与所述引导特征（CGu）不同时，考虑到所述比较结果，在所述显示设备（DD）上显示（30）所述引导图像的至少一项校正信息（Icorr） RESC）。

公开(公告)号：EP1863279A3

公开(公告)日：2009-05-20

申请号：EP07108857.9

申请日：2007-05-24

申请人： Thomson Licensing

发明人： Morvan, Patrick ,  Blonde, Laurent ,  Bourdon, Pascal

IPC分类号： H04N5/913

CPC分类号： H04N5/913 ,  G09G2340/0435 ,  H04N7/167 ,  H04N21/234381 ,  H04N21/2541 ,  H04N21/2662 ,  H04N21/4122 ,  H04N2005/91392

摘要： The present invention relates to a method and a device for displaying a sequence of images that makes it possible to prevent any unauthorized copying of the latter. It applies to any type of digital display device comprising a matrix of light cells comprising a number of rows and/or columns of cells greater than the number of rows and/or of columns of pixels of the images to be displayed. According to the invention, to disrupt the illegal copying of sequences of images in cinema auditoria, it is proposed to modify the frame frequency of the displayed images by varying the number of rows and/or columns of cells addressed with a black level for at least two images of the sequence.

公开(公告)号：EP1936975A1

公开(公告)日：2008-06-25

申请号：EP06301275.1

申请日：2006-12-20

申请人： Thomson Licensing

发明人： Bourdon, Pascal ,  Doyen, Didier ,  Kervec, Jonathan

IPC分类号： H04N5/913

CPC分类号： H04N5/913 ,  H04N2005/91392

摘要： The invention concerns a method for processing a sequence of source pictures to generate artifacts due to aliasing when these source pictures are captured by a video capturing device. This method comprises a first time modulation step for modulating temporally at a first modulation frequency (f m1 ) the brightness of pixels of each picture of the sequence around a brightness to be displayed for said picture. According to an important feature of the invention, the method further comprises a second time modulation step for modulating temporally at a second modulation frequency (f m2 ) different from the first modulation frequency (f m1 ) the brightness of pixels of each picture of the sequence around a brightness value to be displayed for said picture, the first and second modulation frequencies (f m1 ,f m2 ) being determined in order not to be visible to the human eye and contributing to generate aliasing artifact at a predetermined aliasing frequency.

摘要翻译： 本发明涉及一种用于处理源图像序列以在由视频捕捉设备捕获这些源图像时由于混叠而产生伪影的方法。 该方法包括：第一时间调制步骤，用于以第一调制频率（f m1）对所述图像所显示的亮度周围的每个图像的每个图像的像素的亮度进行时间调制。 根据本发明的一个重要特征，该方法还包括一个第二时间调制步骤，用于以与第一调制频率（f m1）不同的第二调制频率（f m2）时间地调制序列的每个图像的像素的亮度 围绕要对所述图像显示的亮度值，确定第一和第二调制频率（f m1，f m2）以便人眼不可见，并有助于以预定的混叠频率产生混叠伪像。

公开(公告)号：EP1843584A1

公开(公告)日：2007-10-10

申请号：EP06290545.0

申请日：2006-04-03

申请人： Thomson Licensing

发明人： Doyen, Didier ,  Bourdon, Pascal ,  Borel, Thierry

IPC分类号： H04N5/913 ,  G06T1/00 ,  H04N9/31 ,  H04N5/74

CPC分类号： H04N9/3197 ,  H04N5/913 ,  H04N9/3123 ,  H04N2005/91392

摘要： The invention relates to a display device using the DLP (Digital Light Processing) technology. This invention is in the field of digital cinema and content protection, where camcorder acquisition followed by immediate illegal distribution creates important revenue losses for content owners. According to the invention, the addressing of the display device is modified in order to introduce an anti-copy processing. The display device comprises modulation means (500) for modulating the colour or brightness of video data of video pictures received at a first rate and for outputting at a second rate modulated video data, said second rate being a multiple of the first rate, subfield coding means (501) for coding said modulated video data into subfield data, said subfield data being delivered at the second rate, and addressing means (502,503) for addressing the array with said subfield data at a third rate. Advantageously, the third rate is not a multiple of the first rate.

摘要翻译： 本发明涉及使用DLP（数字光处理）技术的显示装置。 本发明处于数字电影和内容保护领域，其中摄录机获取后立即非法分发，为内容所有者创造了重要的收入损失。 根据本发明，修改显示设备的寻址以便引入反复制处理。 显示装置包括调制装置（500），用于调制以第一速率接收的视频图像的视频数据的颜色或亮度，并以第二速率输出调制视频数据，所述第二速率是第一速率，子字段编码的倍数 用于将所述调制的视频数据编码为子场数据的装置（501），所述子场数据以第二速率传送;以及寻址装置（502,503），用于以第三速率用所述子场数据寻址阵列。 有利地，第三速率不是第一速率的倍数。

公开(公告)号：EP2071512B8

公开(公告)日：2017-07-12

申请号：EP08171034.5

申请日：2008-12-09

申请人： Thomson Licensing DTV

发明人： Kervec, Jonathan ,  Bourdon, Pascal ,  Menard, Nicolas

IPC分类号： G06T7/00

CPC分类号： H04N5/142 ,  G06T5/20 ,  G06T2207/20032 ,  G06T2207/20192 ,  H04N7/0135 ,  H04N7/0142