公开(公告)号：US20080025612A1

公开(公告)日：2008-01-31

申请号：US11845584

申请日：2007-08-27

申请人： Jian Wang ,  Yingnong Dang ,  Qiang Wang ,  Liyong Chen ,  Xiaoxu Ma

发明人： Jian Wang ,  Yingnong Dang ,  Qiang Wang ,  Liyong Chen ,  Xiaoxu Ma

IPC分类号： G06K9/00

CPC分类号： G06F3/03545 ,  G06F3/0321

摘要： Systems and methods that determine a path of a pen tip as the pen tip is moved across a document are described. The document is watermarked with a maze pattern from which encoded position information is determined. A sequence of images is captured by a camera that is located in a pen. The path of the pen tip is determined by decoding the associated maze pattern and by matching the captured images with document images. If the position coordinates of any frame that is associated with a stroke cannot be determined from m-array decoding, the frames are transformed and then matched with an area of a document image. Once the position coordinates of at least one frame is determined, the position coordinates of other frames are determined by matching the frames in a neighboring area.

摘要翻译： 描述当笔尖移动通过文档时确定笔尖的路径的系统和方法。 文档用迷宫图案加水印，从而确定编码位置信息。 图像序列由位于笔中的相机捕获。 笔尖的路径通过解码相关联的迷宫图案并通过将拍摄的图像与文档图像相匹配来确定。 如果不能从m阵列解码中确定与笔划相关联的任何帧的位置坐标，则将帧变换，然后与文档图像的区域匹配。 一旦确定了至少一帧的位置坐标，则通过匹配相邻区域中的帧来确定其他帧的位置坐标。

公开(公告)号：US20070003150A1

公开(公告)日：2007-01-04

申请号：US11169744

申请日：2005-06-30

申请人： An Xu ,  Chunhui Zhang ,  Jian Wang ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang

发明人： An Xu ,  Chunhui Zhang ,  Jian Wang ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang

IPC分类号： G06K9/36

CPC分类号： G06F3/03545

摘要： A method and system for decoding data on a medium that is captured by an input device is described. The method decodes a symbol design, such as an embedded interaction code (EIC), on a display screen, such as a liquid crystal display (LCD). An image that is captured by an input device, such as a universal pen-type input device with a camera, is received. The captured image is processed to output an extracted bit stream. Position data and/or metadata information is decoded from the extracted bit stream and a position of the captured image with respect to a screen of the LCD is determined based upon the decoded position data. The EIC pattern may be recognized from LCD pixel grids and a bit stream of EIC bits may be extracted based upon the recognized EIC pattern.

摘要翻译： 描述用于对由输入装置捕获的介质上的数据进行解码的方法和系统。 该方法在诸如液晶显示器（LCD）的显示屏上解码符号设计，例如嵌入式交互码（EIC）。 接收由输入装置拍摄的图像，例如具有照相机的通用笔型输入装置。 捕获的图像被处理以输出提取的比特流。 位置数据和/或元数据信息从提取的比特流解码，并且基于解码的位置数据确定捕获图像相对于LCD的屏幕的位置。 可以从LCD像素网格识别EIC图案，并且可以基于所识别的EIC图案来提取EIC位的比特流。

公开(公告)号：US20060269134A1

公开(公告)日：2006-11-30

申请号：US11138959

申请日：2005-05-25

申请人： Jian Wang ,  Liyong Chen ,  Yingnong Dang

发明人： Jian Wang ,  Liyong Chen ,  Yingnong Dang

IPC分类号： G06K9/00 ,  G06K9/40

CPC分类号： G06K9/228 ,  G06K9/38 ,  G06K2209/01

摘要： Pre-processing techniques for processing an image to improve the distinctiveness of an information pattern captured in the image before the information pattern is analyzed in a decoding process. The brightness of an image first is normalized by dividing the image into blocks of areas, such as pixels. A brightness distribution value then is determined for each area of the image by fitting the brightness of its surrounding blocks using bilinear interpolation and extrapolation, and a normalized brightness value for each area can then be obtained by dividing the original brightness value by the brightness distribution value. Next, masks are created to distinguish the information pattern from content captured in the image. The masks may be generated based upon contrast differences between the brightness of pixels representing the information pattern, the brightness of pixels representing content, and the brightness of pixels representing the background of the writing medium.

摘要翻译： 用于处理图像以提高在解码过程中分析信息模式之前在图像中捕获的信息模式的独特性的预处理技术。 首先通过将图像划分成诸如像素的区域的块来对图像的亮度进行归一化。 然后通过使用双线性插值和外推拟合其周围块的亮度来确定图像的每个区域的亮度分布值，然后可以通过将原始亮度值除以亮度分布值来获得每个区域的归一化亮度值 。 接下来，创建掩模以将信息模式与图像中捕获的内容区分开。 可以基于表示信息图案的像素的亮度，表示内容的像素的亮度和表示书写介质的背景的像素的亮度之间的对比度差异来生成掩模。

公开(公告)号：US20060232569A1

公开(公告)日：2006-10-19

申请号：US11106725

申请日：2005-04-15

申请人： Zhouchen Lin ,  Liyong Chen ,  Yingnong Dang ,  Jian Wang

发明人： Zhouchen Lin ,  Liyong Chen ,  Yingnong Dang ,  Jian Wang

IPC分类号： G09G5/00

CPC分类号： G06F3/03545

摘要： A method and apparatus for determining a homography between an image and an expected image is described. The homography accounts for differences in perspective of a camera viewing an objective plane of the image, in some examples, a paper with information on it.

摘要翻译： 描述了用于确定图像和预期图像之间的单应性的方法和装置。 单相法考虑了观察图像的客观平面的相机的视角的差异，在一些示例中，具有关于它的信息的论文。

公开(公告)号：US20060190818A1

公开(公告)日：2006-08-24

申请号：US11062166

申请日：2005-02-18

申请人： Jian Wang ,  Liyong Chen ,  Youjun Liu ,  Jiang Wu

发明人： Jian Wang ,  Liyong Chen ,  Youjun Liu ,  Jiang Wu

IPC分类号： G06F17/24

CPC分类号： G06F17/3002 ,  G06F17/242 ,  G06F17/30056

摘要： Methods and apparatuses that synchronize a paper document to an associated digital document by establishing a mapping. An embedded interactive code (EIC) Document is created as a digital file that serves as an intermediate tier between the paper document and the digital document. Both the paper document and the EIC document are generated while printing the paper document. The EIC document records the corresponding EIC array allocations and a unique document identification number. An image capturing pen may generate a stroke on any page of paper document. With the EIC document, the methods and apparatuses inform an application the page and location on the page of the stroke.

公开(公告)号：US20050149865A1

公开(公告)日：2005-07-07

申请号：US10753176

申请日：2004-01-06

申请人： Jian Wang ,  Yingnong Dang ,  Liyong Chen

发明人： Jian Wang ,  Yingnong Dang ,  Liyong Chen

IPC分类号： G06T1/00 ,  G06F3/03 ,  G06F3/033 ,  G06F3/041 ,  G06F3/042 ,  G06F17/00 ,  G06F17/21 ,  H04N1/387

CPC分类号： G06F3/03542 ,  G06F3/0321

摘要： Disclosed embodiments of the invention relate to analyzing document images, which contain positionally encoded information, such as a maze-pattern watermark, and labeling the images based on a degree to which the document's content, such as text, occludes the position-encoding information. Depending on the degree of such occlusion, it may not be possible to extract enough position-encoding bits from a camera-captured image of the document to determine the camera-captured image's location within the document. An analysis-and-labeling module receives, as input, image data output by an image-generation-and-capturing module and off-line training data; performs analysis-and-labeling processing; and outputs image-label information. The results of document-analysis-and-labeling processing may be used for efficiently determining a location of a camera-captured image within a positionally encoded document.

摘要翻译： 本发明的公开的实施例涉及分析包含诸如迷宫图案水印的位置编码信息的文档图像，并且基于文档的内容（例如文本）封闭位置编码信息的程度来标记图像。 根据这种遮挡的程度，可能无法从文档的摄像机拍摄图像中提取足够的位置编码位，以确定摄像机捕获的图像在文档内的位置。 分析标签模块接收由图像生成和捕获模块输出的图像数据和离线训练数据作为输入; 执行分析和标签处理; 并输出图像标签信息。 文档分析和标签处理的结果可用于有效地确定位置编码的文档内的相机拍摄图像的位置。

公开(公告)号：US10241179B2

公开(公告)日：2019-03-26

申请号：US15469043

申请日：2017-03-24

申请人： David Feinberg ,  Liyong Chen

发明人： David Feinberg ,  Liyong Chen

IPC分类号： G01R33/563 ,  G01R33/46 ,  G01R33/483 ,  A61B5/055 ,  A61B5/00 ,  A61B5/145

摘要： An MRI method and an MRI system that simultaneously detect blood and/or CSF velocity or flow in plural slices or slabs preferably as not spatially adjacent. Two or more sets of interleaved slices or slabs can be assembled to cover the desired volume and derive higher quality MRI signals and images without a need for a contrast agent, even where the volume is too large for effective flow imaging with known techniques without contrast agent.

公开(公告)号：US07885465B2

公开(公告)日：2011-02-08

申请号：US12211473

申请日：2008-09-16

申请人： Jian Wang ,  Yingnong Dang ,  Qiang Wang ,  Liyong Chen ,  Xiaoxu Ma

发明人： Jian Wang ,  Yingnong Dang ,  Qiang Wang ,  Liyong Chen ,  Xiaoxu Ma

IPC分类号： G06K9/68 ,  G06K9/62 ,  G06K19/06 ,  G06F3/033

CPC分类号： G06F3/03545 ,  G06F3/0321

摘要： An efficient technique is provided for determining a portion of a document corresponding to a captured image. Areas of a document in which the pattern is at least partially obscured are identified. A reference pixel in the image is selected, and an offset between the pixel and the pattern is determined. A pixel-by-pixel comparison is then made of the image with the document such that the reference pixel is only compared with locations in the document that are both within the identified areas and have the determined offset from the pattern. The comparison with the highest correspondence between the image pixels and the electronic document then identifies the position of the reference pixel relative to the electronic document.

摘要翻译： 提供了一种用于确定与捕获图像相对应的文档的一部分的有效技术。 识别出图案至少部分模糊的文档的区域。 选择图像中的参考像素，并且确定像素和图案之间的偏移。 然后，对具有文档的图像进行逐像素比较，使得仅将参考像素与文档中位于所识别的区域内的位置进行比较，并且具有从图案确定的偏移。 与图像像素和电子文档之间的最高对应关系的比较然后识别参考像素相对于电子文档的位置。

公开(公告)号：US07580576B2

公开(公告)日：2009-08-25

申请号：US11142910

申请日：2005-06-02

申请人： Jian Wang ,  Jiang Wu ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang ,  Youjun Liu

发明人： Jian Wang ,  Jiang Wu ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang ,  Youjun Liu

IPC分类号： G06K9/00

CPC分类号： G06F3/038 ,  G06F3/03545

摘要： A method and apparatus for capturing information encoded within a surface, such as location information or document metadata, and associating the information with a document is described. The captured information may be obtained by a camera associated with a pointing or writing device having a camera, such as an image-capturing pen.

摘要翻译： 描述用于捕获表面内编码的信息（诸如位置信息或文档元数据）以及将信息与文档相关联的方法和装置。 捕获的信息可以通过与具有诸如图像捕获笔的相机的指示或写入装置相关联的相机获得。

公开(公告)号：US07528848B2

公开(公告)日：2009-05-05

申请号：US11169744

申请日：2005-06-30

申请人： An Xu ,  Chunhui Zhang ,  Jian Wang ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang

发明人： An Xu ,  Chunhui Zhang ,  Jian Wang ,  Liyong Chen ,  Qiang Wang ,  Yingnong Dang

IPC分类号： G09G5/00

CPC分类号： G06F3/03545

摘要： A method and system for decoding data on a medium that is captured by an input device is described. The method decodes a symbol design, such as an embedded interaction code (EIC), on a display screen, such as a liquid crystal display (LCD). An image that is captured by an input device, such as a universal pen-type input device with a camera, is received. The captured image is processed to output an extracted bit stream. Position data and/or metadata information is decoded from the extracted bit stream and a position of the captured image with respect to a screen of the LCD is determined based upon the decoded position data. The EIC pattern may be recognized from LCD pixel grids and a bit stream of EIC bits may be extracted based upon the recognized EIC pattern.

摘要翻译： 描述用于对由输入装置捕获的介质上的数据进行解码的方法和系统。 该方法在诸如液晶显示器（LCD）的显示屏上解码符号设计，例如嵌入式交互码（EIC）。 接收由输入装置拍摄的图像，例如具有照相机的通用笔型输入装置。 捕获的图像被处理以输出提取的比特流。 位置数据和/或元数据信息从提取的比特流解码，并且基于解码的位置数据确定捕获图像相对于LCD的屏幕的位置。 可以从LCD像素网格识别EIC图案，并且可以基于所识别的EIC图案来提取EIC位的比特流。