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    • 1. 发明申请
    • Methods For Generating Enhanced Digital Images
    • 生成增强型数字图像的方法
    • US20080036886A1
    • 2008-02-14
    • US11748851
    • 2007-05-15
    • Brett HanniganAlastair Reed
    • Brett HanniganAlastair Reed
    • H04N9/083
    • G06K9/00G06T3/4007G06T3/4015
    • Slight camera movement between capture of successive images is advantageously utilized to minimize or eliminate the need to interpolate in order to fill in the “holes” in a Bayer pattern. The captured color values from multiple appropriately positioned images are used to fill these holes. For example, instead of interpolating the value of red for the second pixel position on the first row of a Bayer pattern, an image is selected which is positioned one pixel to the right of the first image, and the red vales from this image are used for the red values of the second pixel on the first line. Values of the pixels in multiple images which are appropriately aligned to each pixel position are averaged to generate a better value for each pixel position. Information carried by a digital watermark (either alone or together with other techniques) is used to determine the alignment of the images. Images are selected which are positioned so that corresponding pixels fall within a specified tolerance from a location in a Bayer pattern. The pixel values of the images which fall within the specified tolerance of each pixel position in a Bayer pattern are selected and used for the alignment.
    • 有利地利用连续图像的拍摄之间的轻微的相机移动来最小化或消除内插的需要,以填充拜耳图案中的“孔”。 来自多个适当定位的图像的捕获的颜色值用于填充这些孔。 例如,代替内插Bayer图案的第一行上的第二像素位置的红色值,选择位于第一图像右侧一个像素的图像,并且使用来自该图像的红色值 对于第一行上第二个像素的红色值。 对与每个像素位置适当对齐的多个图像中的像素的值进行平均以为每个像素位置产生更好的值。 使用数字水印(单独或与其他技术一起)携带的信息来确定图像的对准。 被选择的图像被定位成使得相应的像素落在从拜耳图案中的位置指定的公差范围内。 落在拜耳图案中的每个像素位置的指定公差内的图像的像素值被选择并用于对准。
    • 3. 发明申请
    • Digital Watermark Detection Using Predetermined Color Projections
    • 使用预定颜色投影的数字水印检测
    • US20070147653A1
    • 2007-06-28
    • US11427265
    • 2006-06-28
    • Alastair ReedBrett Hannigan
    • Alastair ReedBrett Hannigan
    • G06K9/00
    • G06T1/0028G06T1/0042G06T2201/0051G06T2201/0065
    • The present invention relates to digital watermarking. In one implementation, a system is provided to read a digital watermark from digital imagery which includes data representing a number of pixels. Each pixel of the number of pixels is defined by a set of values representing color components of the particular pixel. The digital watermark is embedded in the digital imagery through modifications to at least some data representing the digital imagery. The system includes a filter to calculate values of pixels along a preferred projection axis, the preferred projection axis corresponds to a direction of embedding determined based on color characteristics of at least some pixels associated with the digital imagery; and a digital watermark reader which operates on values calculated by the filter. Other implementations are provided as well.
    • 本发明涉及数字水印技术。 在一个实现中,提供了一种系统,用于从数字图像读取数字水印,数字图像包括表示多个像素的数据。 像素数的每个像素由表示特定像素的颜色分量的一组值定义。 通过对代表数字图像的至少一些数据进行修改,将数字水印嵌入到数字图像中。 该系统包括用于计算沿着优选投影轴的像素值的滤光器,优选投影轴对应于基于与数字图像相关联的至少一些像素的颜色特性确定的嵌入方向; 以及对由滤波器计算的值进行操作的数字水印读取器。 还提供其他实现。
    • 8. 发明申请
    • Progressive watermark decoding on a distributed computing platform
    • 分布式计算平台上的逐行水印解码
    • US20050036653A1
    • 2005-02-17
    • US10828930
    • 2004-04-20
    • Trent BrundageBrett HanniganRavi Sharma
    • Trent BrundageBrett HanniganRavi Sharma
    • G06T1/00G06K9/00
    • G06T1/005G06T2201/0065
    • The disclosure describes a method of progressively decoding a digital watermark on a distributed computing platform. A client device equipped with a digital camera, such as a PDA or cell phone, captures a digital image of a watermarked object, and pre-filters the image to isolate a portion of the image data suspected of containing a digital watermark. The pre-filter de-correlates a portion of the image data suspected of containing a digital watermark from the remaining host image signal using a predictive filter. The client then quantizes the filtered data and progressively transmits the quantized data to a watermark decoder. The progressive transmitter sends image data as necessary to achieve a valid decoding operation. To reduce bandwidth requirements, the transmitter starts with the most highly quantized version of the filtered image, and sends lesser quantized versions until the watermark decoder completes a successful decoding operation.
    • 本公开描述了在分布式计算平台上逐渐解码数字水印的方法。 配备有诸如PDA或手机的数字照相机的客户端设备捕获水印物体的数字图像,并对图像进行预过滤以隔离怀疑包含数字水印的图像数据的一部分。 预滤波器使用预测滤波器将怀疑含有数字水印的图像数据的一部分与剩余的主机图像信号相关联。 然后,客户端对经滤波的数据进行量化,并将量化的数据逐渐发送到水印解码器。 逐行发送器根据需要发送图像数据以实现有效的解码操作。 为了减少带宽要求,发射机以最高量化版本的滤波图像开始,并发送较小的量化版本,直到水印解码器完成成功的解码操作。