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61. 发明授权

US07403658B2 Direct homography computation by local linearization 失效
标题翻译：通过局部线性化直接进行单应性计算
公开(公告)号：US07403658B2
公开(公告)日：2008-07-22
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： G06K9/62
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。

62. 发明授权

US07349554B2 Maze pattern analysis 有权
标题翻译：迷宫模式分析
公开(公告)号：US07349554B2
公开(公告)日：2008-03-25
申请号：US10932803
申请日：2004-09-02
申请人： Liyong Chen , Yingnong Dang , Xiaoxu Ma , Jian Wang , Qiang Wang
发明人： Liyong Chen , Yingnong Dang , Xiaoxu Ma , Jian Wang , Qiang Wang
IPC分类号： H04K1/00
CPC分类号： G06F3/0321 , G06F3/03545 , G06T7/80 , H04N1/32208 , H04N2201/3269
摘要： Processes and apparatuses analyze an image of maze pattern in order to extract bits encoded in the maze pattern. Grid lines of a maze pattern are determined. Directions for effective pixels of associated bars are estimated and are grouped into clusters. Lines are estimated for selected effective pixels of a selected cluster that is associated with a first principal direction. Grid lines of another cluster are determined, where the other cluster is associated with a second principal direction that is perpendicular with the first principal direction. Estimated lines are pruned based on slope variation analysis, grouped based on a distance analysis, and a best fit line is selected from each group. Affine parameters are determined from best fit lines. The correct orientation of a maze pattern is obtained by determining a type of missing corner of the maze pattern. Bits are extracted from the image of maze pattern by processing gray level values of the associated maze pattern cells.
摘要翻译：过程和设备分析迷宫图案的图像，以便提取在迷宫图案中编码的比特。确定迷宫图案的网格线。估计关联条的有效像素的方向，并将其分组成簇。对于与第一主方向相关联的所选择的集群的所选有效像素估计行。确定另一个簇的网格线，其中另一个簇与与第一主方向垂直的第二主方向相关联。基于斜率变化分析修剪估计行，根据距离分析进行分组，并从每组中选择最佳拟合线。仿射参数由最佳拟合线确定。通过确定迷宫图案的缺失角落的类型，可以获得迷宫图案的正确方向。通过处理相关联的迷宫图案单元的灰度值，从迷宫图案的图像中提取位。

63. 发明申请

US20080025612A1 Strokes Localization by m-Array Decoding and Fast Image Matching 失效
标题翻译：通过m阵列解码和快速图像匹配进行笔画定位
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。

64. 发明申请

US20070003150A1 Embedded interaction code decoding for a liquid crystal display 有权
标题翻译：用于液晶显示器的嵌入式交互码解码
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。

65. 发明申请

US20060269134A1 Preprocessing for information pattern analysis 有权
标题翻译：预处理信息模式分析
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。

66. 发明申请

US20060242560A1 Local metadata embedding and decoding 有权
公开(公告)号：US20060242560A1
公开(公告)日：2006-10-26
申请号：US11112637
申请日：2005-04-22
申请人： Jian Wang , Zhouchen Lin , Yue Li , Chunhui Zhang , Yingnong Dang , Jiang Wu , Qiang Wang
发明人： Jian Wang , Zhouchen Lin , Yue Li , Chunhui Zhang , Yingnong Dang , Jiang Wu , Qiang Wang
IPC分类号： G06F17/00
CPC分类号： G06F3/03545
摘要： In accordance with embodiments of the invention, local metadata is embedded into an embedded interactive code document by combining a first m-array and a second m-array to generate a combined m-array with encoded local metadata such that a start position of the second m-array in the combined m-array is shifted, by an amount that is based on the local metadata, relative to a start position of the first m-array in the combined m-array. The first m-array and the second m-array may contain the same repeating bit sequence. Local metadata may be decoded from the embedded interactive code document by decoding the local metadata from the combined m-array by determining the amount by which the second m-array is shifted, relative to the first m-array, in the combined m-array.

67. 发明申请

US20060232569A1 Direct homography computation by local linearization 失效
标题翻译：通过局部线性化直接进行单应性计算
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。

68. 发明申请

US20050149865A1 Positionally encoded document image analysis and labeling 有权
标题翻译：位置编码文件图像分析和标签
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。

69. 发明授权

US07885465B2 Document portion identification by fast image mapping 有权
标题翻译：通过快速图像映射的文档部分识别
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。

70. 发明授权

US07580576B2 Stroke localization and binding to electronic document 有权
标题翻译：笔画本地化和绑定到电子文档
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。

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