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    • 3. 发明授权
    • Automatic geometric image transformations using embedded signals
    • 使用嵌入式信号的自动几何图像变换
    • US5949055A
    • 1999-09-07
    • US956839
    • 1997-10-23
    • David J. FleetDavid J. HeegerTodd A. CassDavid L. Hecht
    • David J. FleetDavid J. HeegerTodd A. CassDavid L. Hecht
    • G06T1/00H04N1/32G06K7/12
    • G06T1/0028G06T1/0064H04N1/32203H04N1/32208H04N1/32229H04N1/32309G06T2201/0051G06T2201/0083G06T2201/0202G06T2201/0601H04N2201/3233H04N2201/327
    • An acquired (e.g., scanned) image contains an imperceptible periodic signal component (e.g., a sinusoid), decoding of which can be used to automatically determine a linear geometric relationship between the acquired image and the original image in which the signal was embedded, without having the original image available during the decoding process. This known geometric relationship allows for linear geometric properties of the acquired image, such as alignment and scaling, to be automatically matched with those of the original image so that the acquired image may be automatically oriented and scaled to the size of the original image. The embedded periodic signals produce a distinct pattern of local peak power concentrations in a spatial frequency amplitude spectrum of the acquired image. Using geometric constraint information about the embedded signals when the signals were originally embedded in the image, the locations and spatial frequencies of the signals are decoded from the image, providing a linear mapping between the peak power concentrations of the acquired and original image spatial frequency amplitude spectra. This linear mapping can be used to compute the linear geometric relationship between the two images. In an illustrated embodiment, the acquired image contains a set of sinusoidal signals that act as a grid. Decoding of the sinusoids does not require the original image, only information about the predetermined geometric relationship of the embedded sinusoids.
    • 获取的(例如,扫描的)图像包含不可察觉的周期性信号分量(例如,正弦曲线),其解码可用于自动确定所获取的图像与其中嵌入信号的原始图像之间的线性几何关系,而没有 在解码过程中可以获得原始图像。 这种已知的几何关系允许所获取的图像的线性几何属性(例如对准和缩放)自动与原始图像的几何属性匹配,使得所获取的图像可以被自动定向并且缩放到原始图像的尺寸。 嵌入的周期信号在所获取的图像的空间频率幅度谱中产生局部峰值功率浓度的不同图案。 当信号最初嵌入到图像中时,使用关于嵌入信号的几何约束信息,从图像中解码信号的位置和空间频率,从而提供所获取的和原始图像空间频率幅度的峰值功率浓度之间的线性映射 光谱。 该线性映射可用于计算两个图像之间的线性几何关系。 在所示实施例中,所获取的图像包含用作网格的一组正弦信号。 正弦曲线的解码不需要原始图像,只有关于嵌入的正弦曲线的预定几何关系的信息。
    • 6. 发明授权
    • Encoding data in color images using patterned color modulated image
regions
    • 使用图案化色调图像区域对彩色图像中的数据进行编码
    • US5946414A
    • 1999-08-31
    • US162119
    • 1998-08-28
    • Todd A. CassXin Tong
    • Todd A. CassXin Tong
    • H04N1/387G06T1/00G06T9/00H04N1/32H04N1/41H04N1/46H04N1/60G06K9/00
    • G06T9/00G06T1/0021H04N1/32208H04N1/32309H04N2201/3261H04N2201/327
    • Message values included in a set of valid message values that constitute a coding scheme are each encoded in an image region, called an encoded signal block, composed of a spatially arranged pattern of colored sub-regions. The colored sub-regions have color values produced by modulating a reference color value by a color change quantity expressed as a color space direction in a multi-dimensional color space such that the average color of all of the sub-region colors is the reference color. There is a unique pattern of color-modulated sub-regions for each valid message value in the coding scheme. In one embodiment, the color space direction is computed to be simultaneously detectable by a digital image capture device such as a scanner and substantially imperceptible to a human viewer, so that the embedded data represented by the pattern of color modulations are visually imperceptible in the encoded signal block. When the reference color is determined to be the average color of an image region in an original color image, the encoded signal block may replace the image region in the original image, producing an encoded image version of the original image having little or no image degradation. In this case, the original image colors become carriers of the encoded data. Signal blocks may be arranged to encode data in only one dimension in an image, which allows for less complex decoding algorithms, or in a two dimensional array or grid-like structure, which allows for a high encoded data density rate.
    • 包含在构成编码方案的一组有效消息值中的消息值分别被编码在由彩色子区域的空间排列图案组成的称为编码信号块的图像区域中。 有色子区域具有通过在多维颜色空间中以颜色空间方向表示的颜色变化量调制参考颜色值而产生的颜色值,使得所有子区域颜色的平均颜色为参考颜色 。 对于编码方案中的每个有效消息值,存在着色调制子区域的独特模式。 在一个实施例中,颜色空间方向被计算为可由诸如扫描仪的数字图像捕获设备同时检测,并且对人类观察者基本上不可察觉,使得由编码的颜色调制图案表示的嵌入数据在视觉上不可察觉 信号块。 当参考颜色被确定为原始彩色图像中的图像区域的平均颜色时,编码信号块可以代替原始图像中的图像区域,产生具有很少或没有图像劣化的原始图像的编码图像版本 。 在这种情况下,原始图像颜色成为编码数据的载体。 信号块可以被布置成仅在图像中的一个维度上对数据进行编码,这允许较不复杂的解码算法,或允许高编码数据密度率的二维阵列或网格状结构。