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    Assessment of camera phone distortion for digital watermarking
    132.
    发明授权
    Assessment of camera phone distortion for digital watermarking 有权

    公开(公告)号：US09697578B2

    公开(公告)日：2017-07-04

    申请号：US14579371

    申请日：2014-12-22

    Applicant: Digimarc Corporation

    Inventor： Aparna R. Gurijala ,  Alastair M. Reed

    IPC: G06K9/00 ,  G06T1/00

    CPC classification number: G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0202

    Abstract: The present disclosure relates generally to cell phones and cameras, and to digital watermarking involving such cell phones and cameras. One claim recites a method comprising: measuring distortion introduced by a cell phone camera; using a programmed electronic processor, quantifying the distortion; and providing quantified distortion as feedback to adjust a digital watermark embedding process in view of the distortion introduced by the cell phone camera. The act of quantifying distortion may include, e.g., quantifying a spatial frequency response (SFR) of the cell phone camera. Of course, other claims and combinations are provided too.

    Digital watermarking methods, apparatus and systems
    133.
    发明授权
    Digital watermarking methods, apparatus and systems 有权

    公开(公告)号：US09665919B2

    公开(公告)日：2017-05-30

    申请号：US15131961

    申请日：2016-04-18

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Ravi K. Sharma

    IPC: G06K9/00 ,  G06T1/00 ,  H04N1/32

    CPC classification number: G06T1/0028 ,  G06K9/00 ,  G06T1/0021 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0052 ,  G06T2201/0601 ,  H04N1/32309

    Abstract: The present invention relate generally to digital watermarking and data hiding. One claim recites an apparatus comprising: electronic memory for storing first color data and second color data, the first color data and the second color data represent data from a color image signal or color video signal, and a digital watermark signal, the digital watermark signal serving to facilitate detection of a watermark message; means for separating the digital watermark signal into first frequency components and second frequency components; means for modifying the first color data by hiding the first frequency components therein; and means for modifying the second color data by hiding the second frequency components therein. Of course, other combinations and claims are provided too.

    Full color visibility model using CSF which varies spatially with local luminance
    136.
    发明授权
    Full color visibility model using CSF which varies spatially with local luminance 有权
    使用CSF在空间上与局部亮度变化的全色可见性模型

    公开(公告)号：US09565335B2

    公开(公告)日：2017-02-07

    申请号：US15137401

    申请日：2016-04-25

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Kristyn R. Falkenstern ,  David Berfanger ,  Yang Bai

    IPC: G06K9/00 ,  H04N1/32 ,  H04N1/60 ,  H04N7/167

    CPC classification number: G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0083 ,  G06T2201/0202 ,  H04N1/32309 ,  H04N1/6005 ,  H04N2201/3233

    Abstract: The present disclosure relate generally to image signal processing, color science and signal encoding. One claim recites an apparatus including: an input for obtaining color image data; memory for storing a luminance contrast sensitivity function (CSF1) and a chrominance contrast sensitivity function (CSF2); means for degrading data representing color image data with the CSF1 and the CSF2 to predict visibility changes attributable to encoding plural-bit information in the obtained color image data, in which the CSF1 varies depending on luminance values associated with local regions of the color image data, in which said means for degrading data representing color image data yields results for different image areas within the color image data, and in which the CSF1 is used for degrading luminance data and the CSF2 is used for degrading chrominance data; and means for altering the color image data by encoding plural-bit information therein, in which signal embedding strength of the encoding within the different image areas varies based on the results. Of course, other features, combinations and claims are disclosed as well.

    Abstract translation: 本公开一般涉及图像信号处理，色彩科学和信号编码。 一个权利要求记载一种装置，包括：用于获得彩色图像数据的输入; 用于存储亮度对比度敏感度函数（CSF1）和色度对比度敏感度函数（CSF2）的存储器; 用于使用CSF1和CSF2降级表示彩色图像数据的数据的装置，用于预测可归因于所获得的彩色图像数据中的多位信息的识别变化，其中CSF1根据与彩色图像数据的局部区域相关联的亮度值而变化 其中所述用于降级表示彩色图像数据的数据的装置产生彩色图像数据内的不同图像区域的结果，并且其中使用CSF1降解亮度数据，并且使用CSF2降解色度数据; 以及用于通过对其中的多位信息进行编码来改变彩色图像数据的装置，其中不同图像区域内的编码的信号嵌入强度基于结果而变化。 当然，也公开了其它特征，组合和权利要求。

    MACHINE-READABLE GLASS
    138.
    发明申请
    MACHINE-READABLE GLASS 有权
    机器可读玻璃

    公开(公告)号：US20160180207A1

    公开(公告)日：2016-06-23

    申请号：US14971930

    申请日：2015-12-16

    Applicant: Digimarc Corporation

    Inventor： Tony F. Rodriguez ,  Kristyn R. Falkenstern ,  Alastair M. Reed

    IPC: G06K19/06

    CPC classification number: G06K19/06037 ,  G06K7/1095

    Abstract: In one embodiment, a sidewalk-facing display window of a retail store is treated to scatter (or absorb) a portion of incident light, in a narrow wavelength spectral band. A machine-readable pattern, which encodes an identifier, is projected onto the treated window from outside the store. The reflection (absorption) of that projected pattern, within the narrow spectral band, escapes notice of shoppers on the sidewalk. Yet if a shopper captures imagery of a product displayed on the other side of the display window, using a mobile device camera, the pattern is captured with the imagery, and can be analyzed to decode the identifier. The mobile device can use this decoded identifier to access online information about the displayed product, for presentation to the shopper on the mobile device display. The technology is particularly suited for wearable computing devices, and more generally enables glass windows to subliminally convey digital information to image sensors conveyed by passing shoppers. A great variety of other features and arrangements are also detailed.

    Abstract translation: 在一个实施例中，零售商店的面向人行道的显示窗被处理以在窄波长频谱带中散射（或吸收）一部分入射光。 编码标识符的机器可读模式从商店外部投影到经处理的窗口上。 在狭窄的光谱带内，该投影图案的反射（吸收）消失了人行道上购物者的注意事项。 然而，如果购物者捕获在显示窗口另一侧显示的产品的图像，则使用移动设备相机，则利用图像捕获图案​​，并且可以对该图案进行分析以解码标识符。 移动设备可以使用该解码的标识符来访问关于所显示的产品的在线信息，以便在移动设备显示器上呈现给购物者。 该技术特别适用于可穿戴式计算设备，更一般地，玻璃窗可以将数字信息潜移默化地传送给经过购物者传送的图像传感器。 还详细介绍了各种各样的其他功能和安排。

    FULL-COLOR VISIBILITY MODEL USING CSF WHICH VARIES SPATIALLY WITH LOCAL LUMINANCE
    139.
    发明申请
    FULL-COLOR VISIBILITY MODEL USING CSF WHICH VARIES SPATIALLY WITH LOCAL LUMINANCE 有权
    全彩色可见性模型，使用各种空间与本地照明的CSF

    公开(公告)号：US20150187039A1

    公开(公告)日：2015-07-02

    申请号：US14588636

    申请日：2015-01-02

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Yang Bai ,  Kristyn R. Falkenstern ,  David Berfanger

    IPC: G06T1/00 ,  G06T7/40

    CPC classification number: G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0083 ,  G06T2201/0202

    Abstract: The present disclosure relate generally to color science and digital watermarking. A full color visibility model has been developed which has good correlation to subjective visibility tests for color patches degraded with a watermark. A relatively better correlation can be achieved with a model that applies a luminance correction to the contrast sensitivity functions (CSF). The model can be applied during the watermark embed process, using a pyramid based method, to obtain equal visibility. Better robustness and visibility can be obtained with equal visibility embed than uniform strength embed. Of course, other features, combinations and claims are disclosed as well.

    Abstract translation: 本公开一般涉及彩色科学和数字水印。 已经开发了全色可见性模型，其与用水印降级的色斑的主观可见性测试具有良好的相关性。 使用向对比度敏感度函数（CSF）施加亮度校正的模型可以实现相对更好的相关性。 该模型可以在水印嵌入过程中应用，使用基于金字塔的方法，以获得相等的可见性。 可以通过均匀的强度嵌入具有相同的可见性嵌入来获得更好的鲁棒性和可见性。 当然，也公开了其它特征，组合和权利要求。

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