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    • 2. 发明授权
    • Method and device for processing a sequence of video images
    • 用于处理视频图像序列的方法和装置
    • US07822202B2
    • 2010-10-26
    • US11698013
    • 2007-01-25
    • Pascal BourdonLaurent BlondeThierry Borel
    • Pascal BourdonLaurent BlondeThierry Borel
    • H04N7/167
    • H04N5/913H04N5/74H04N2005/91392
    • 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.
    • 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。 摄像机的快门通常与低通滤波器相比较。 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。 快门效应的正确的数学模型化表明,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影的调制频率,而且还可以通过经过快门的旁瓣来生成伪影,尽管低快门速度设置 光谱。
    • 3. 发明申请
    • Method for processing a video sequence and apparatus implementing said method
    • 用于处理视频序列的方法和实现所述方法的装置
    • US20070212024A1
    • 2007-09-13
    • US11711517
    • 2007-02-27
    • Pascal BourdonLaurent BlondePhilippe Le Roy
    • Pascal BourdonLaurent BlondePhilippe Le Roy
    • H04N5/91
    • H04N5/913H04N2005/91392
    • The present invention is in the field of Content protection, most particularly in cinema venues where camcorder acquisition followed by immediate illegal distribution creates important revenue losses for content owners. It is known that anti-camcorder systems using a color modulation can be circumvented by using low shutter speed in the camcorder. Today, the shutter speed is determined automatically by the camcorder as a function of the filmed video source. In automatic configurations, shutter speed self-adapts to either motion, or flicker detection, both of which taking into account brightness variations only. The proposed invention proposes a dual color/brightness modulation to defeat automatic shutter speed adjustment. For example, a color modulation at 50/60 Hz is carried out and a brightness modulation at a higher frequency 100/120 Hz is added to force the camcorder to work at a high shutter speed.
    • 本发明在内容保护领域,特别是在摄像机获取之后立即被非法分发的电影场所,对于内容所有者来说,对于收入损失是重要的。 众所周知,使用彩色调制的防摄录机系统可以通过在摄像机中使用低快门速度来避开。 今天,快照速度由摄像机自动确定为拍摄视频源的功能。 在自动配置中,快门速度自适应运动或闪烁检测,这两者都仅考虑亮度变化。 所提出的发明提出了一种双色/亮度调制来打败自动快门速度调节。 例如,执行50/60Hz的色调,并且增加更高频率100/120Hz的亮度调制以迫使摄像机以高快门速度工作。
    • 4. 发明申请
    • Method and device for processing a sequence of video images
    • 用于处理视频图像序列的方法和装置
    • US20070172057A1
    • 2007-07-26
    • US11698013
    • 2007-01-25
    • Pascal BourdonLaurent BlondeThierry Borel
    • Pascal BourdonLaurent BlondeThierry Borel
    • H04N7/167
    • H04N5/913H04N5/74H04N2005/91392
    • 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.
    • 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。 摄像机的快门通常与低通滤波器相比较。 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。 快门效应的正确的数学模型化表明,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影的调制频率,而且还可以通过经过快门的旁瓣来生成伪影,尽管低快门速度设置 光谱。
    • 8. 发明授权
    • Method for describing an actual color gamut of a color device or of a color content
    • 描述彩色装置或彩色内容的实际色域的方法
    • US08724892B2
    • 2014-05-13
    • US12452744
    • 2008-07-25
    • Jürgen StauderLaurent BlondePatrick Morvan
    • Jürgen StauderLaurent BlondePatrick Morvan
    • G06K9/00
    • H04N1/6058
    • To describe the actual color gamut, a hierarchical structure is proposed which comprises, from bottom to top: Gamut Components: each GC is a surface, generally described as a set of connected elementary triangles or polygons. Gamut Hulls: each GH is a closed surface formed by the concatenation of connex Gamut Components. Gamut Instances: each GI is an alternative Gamut Boundary Description of the same actual gamut and is built by the union of the volume(s) bordered by at least one Gamut Hull. Such a Gamut Boundary Information may be notably used for gamut mapping operations. Among advantages of the invention, are flexibility and adaptation to available memory and bandwidth capabilities.
    • 为了描述实际的色域,提出了从底部到顶部的分层结构:色域分量:每个GC是一个表面,通常被描述为一组连接的基本三角形或多边形。 Gamut Hulls:每个GH是通过连接器连接器组件形成的封闭表面。 色域实例:每个GI是相同实际色域的替代色域边界描述,由至少一个Gamut Hull所界定的卷的联合构建。 这样的色域边界信息可能特别用于色域映射操作。 本发明的优点是灵活性和适应于可用存储器和带宽能力。