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1. 发明授权

US07057615B2 Method and system for representing and displaying digital ink 有权
公开(公告)号：US07057615B2
公开(公告)日：2006-06-06
申请号：US09894824
申请日：2001-06-28
申请人： Jian Wang , Liyong Chen , Yu Zou , Siwei Lyu
发明人： Jian Wang , Liyong Chen , Yu Zou , Siwei Lyu
IPC分类号： G09G5/00 , G06T11/20
CPC分类号： G06T11/203 , G06K9/222
摘要： A method and system for compressing and displaying a digital ink trace. Raw ink data is smoothed, and sharp points of the smoothed line are found. Curve-fitting is then used to generate a mathematical expression that defines the line segments between adjacent sharp points. The ink trace then is represented by a backbone spline that includes the sharp points and the mathematical expressions for the line segments. Thickness information, such as pressure or acceleration information, is combined with the backbone spline to provide a compressed ink file that represents a contour curve of the original ink trace. A display module uses an algorithm to separate the contour curve into a sequence of straight lines. A set of pixels is then generated for the display of each straight line using a novel antialiasing method. The pixels at the ends of adjacent straight lines are aligned using a weighting algorithm.

2. 发明授权

US07450125B2 Method and system for representing and displaying digital ink 有权
标题翻译：用于表示和显示数字墨水的方法和系统
公开(公告)号：US07450125B2
公开(公告)日：2008-11-11
申请号：US11446491
申请日：2006-06-01
申请人： Jian Wang , Yu Zou , Liyong Chen , Siwei Lyu
发明人： Jian Wang , Yu Zou , Liyong Chen , Siwei Lyu
IPC分类号： G06T11/20
CPC分类号： G06T11/203 , G06K9/222
摘要： A method and system for compressing and displaying a digital ink trace. Raw ink data is smoothed, and sharp points of the smoothed line are found. Curve-fitting is then used to generate a mathematical expression that defines the line segments between adjacent sharp points. The ink trace then is represented by a backbone spline that includes the sharp points and the mathematical expressions for the line segments. Thickness information, such as pressure or acceleration information, is combined with the backbone spline to provide a compressed ink file that represents a contour curve of the original ink trace. A display module uses an algorithm to separate the contour curve into a sequence of straight lines. A set of pixels is then generated for the display of each straight line using a novel antialiasing method. The pixels at the ends of adjacent straight lines are aligned using a weighting algorithm.
摘要翻译：一种用于压缩和显示数字墨迹的方法和系统。原始油墨数据平滑，找到平滑线的尖点。然后使用曲线拟合来生成定义相邻尖点之间的线段的数学表达式。然后，油墨迹线由包括尖锐点和线段的数学表达式的主干样条表示。将厚度信息（例如压力或加速度信息）与骨架花键组合，以提供表示原始油墨迹线的轮廓曲线的压缩油墨文件。显示模块使用算法将轮廓曲线分成直线序列。然后使用新颖的抗锯齿方法生成一组像素用于每条直线的显示。使用加权算法将相邻直线的末端处的像素对准。

3. 发明申请

US20060290698A1 Method and system for representing and displaying digital ink 有权
公开(公告)号：US20060290698A1
公开(公告)日：2006-12-28
申请号：US11446491
申请日：2006-06-01
申请人： Jian Wang , Liyong Chen , Yu Zou , Siwei Lyu
发明人： Jian Wang , Liyong Chen , Yu Zou , Siwei Lyu
IPC分类号： G06T11/20
CPC分类号： G06T11/203 , G06K9/222
摘要： A method and system for compressing and displaying a digital ink trace. Raw ink data is smoothed, and sharp points of the smoothed line are found. Curve-fitting is then used to generate a mathematical expression that defines the line segments between adjacent sharp points. The ink trace then is represented by a backbone spline that includes the sharp points and the mathematical expressions for the line segments. Thickness information, such as pressure or acceleration information, is combined with the backbone spline to provide a compressed ink file that represents a contour curve of the original ink trace. A display module uses an algorithm to separate the contour curve into a sequence of straight lines. A set of pixels is then generated for the display of each straight line using a novel antialiasing method. The pixels at the ends of adjacent straight lines are aligned using a weighting algorithm.

4. 发明授权

US07298903B2 Method and system for separating text and drawings in digital ink 有权
标题翻译：数字墨水分离文字和图纸的方法和系统
公开(公告)号：US07298903B2
公开(公告)日：2007-11-20
申请号：US09895429
申请日：2001-06-28
申请人： Jian Wang , Haibin Ling , Siwei Lyu , Yu Zou
发明人： Jian Wang , Haibin Ling , Siwei Lyu , Yu Zou
IPC分类号： G06K9/18 , G06K9/00
CPC分类号： G06K9/00456
摘要： A system for separating text and drawings in a digital ink file (e.g., a handwritten digital ink file). A stroke analyzer classifies single strokes that have been input by a user as “text” or “unknown.” The stroke analyzer utilizes a trainable classifier, such as a support vector machine. A grouping component is provided that groups text strokes in an attempt to form text objects (e.g., words, characters, or letters). The grouping component also groups unknown strokes in an attempt to form objects (e.g., shapes, drawings, or even text). A trainable classifier, such as a support vector machine, evaluates the grouped strokes to determine if they are objects.
摘要翻译：用于分离数字墨水文件（例如，手写数字墨水文件）中的文本和图纸的系统。笔划分析器将用户输入的单笔划分为“文字”或“未知”。笔划分析仪使用可分类的分类器，例如支持向量机。提供了分组组件，其组合文本笔画以试图形成文本对象（例如，单词，字符或字母）。分组组件还组合未知笔画以试图形成对象（例如，形状，图形，甚至文本）。可训练的分类器，例如支持向量机，评估分组的笔画以确定它们是否是对象。

5. 发明授权

US07536051B2 Digital pen calibration by local linearization 有权
标题翻译：数字笔校准通过局部线性化
公开(公告)号：US07536051B2
公开(公告)日：2009-05-19
申请号：US11060120
申请日：2005-02-17
申请人： Zhouchen Lin , Liyong Chen , Jian Wang
发明人： Zhouchen Lin , Liyong Chen , Jian Wang
IPC分类号： G06K9/00
CPC分类号： G06K9/222
摘要： X-y positions of a digital pen's tip may be determined by using a calibration parameter to map the x-y positions of the respective centers of images captured by the pen's camera. The calibration parameter may be generated by iteratively calculating estimates of the calibration parameter. The iteratively calculated estimates may be based on a gradient of an error function of the iteratively generated estimates. Calibration input data may be produced by a user placing the pen tip in a fixed location on a surface, which may be a positionally encoded medium, such as paper, and then rotating the pen and/or moving the opposite end of the pen in various directions to capture multiple images for use in generating the calibration parameter. A user may perform such a calibration procedure without the need for complicated calibration equipment typically used in connection with conventional calibration techniques.
摘要翻译：数字笔尖的X-Y位置可以通过使用校准参数来确定由笔的相机拍摄的各个中心的x-y位置来确定。可以通过迭代地计算校准参数的估计来生成校准参数。迭代计算的估计可以基于迭代产生的估计的误差函数的梯度。校准输入数据可以由用户将笔尖放置在表面上的固定位置（其可以是位置编码的介质，例如纸）然后旋转笔和/或使笔的相对端移动到各种捕获多个图像以用于生成校准参数的方向。用户可以执行这样的校准过程，而不需要通常结合常规校准技术使用的复杂校准设备。

6. 发明授权

US07529410B2 Local localization using fast image match 有权
标题翻译：本地本地化使用快速图像匹配
公开(公告)号：US07529410B2
公开(公告)日：2009-05-05
申请号：US10752081
申请日：2004-01-07
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： G06K9/46 , G06K9/62 , G06F3/033 , G01B7/00
CPC分类号： G06F3/0321 , G06F3/03545 , G06K9/222 , G06K9/24 , G06T7/74
摘要： A technique is disclosed for determining a portion of a document corresponding to a captured image. A user employs a pen to create a stroke in a document, and images are captured by a camera mounted on the pen. The locations of some of the images are determined by, e.g., analyzing a pattern on the document captured by the image or by a pixel-by-pixel comparison of the image with the document. The locations of other images are determined by segmenting the sequence of images into groups corresponding to the shape of the stroke. Information relating to a located image in a segment is employed to determine the position of an unlocated image in the segment. This determined position is used for obtaining further information that may be used to determine the position of another unlocated image in the segment, and so on, until the segment is finished.
摘要翻译：公开了一种用于确定与拍摄图像相对应的文档的一部分的技术。用户使用笔在文档中创建笔画，并且图像由安装在笔上的相机捕获。一些图像的位置通过例如分析由图像捕获的文档上的图案或通过图像与文档的逐像素比较来确定。通过将图像序列分割成对应于笔画形状的组来确定其他图像的位置。使用与片段中的定位图像有关的信息来确定片段中未定位图像的位置。该确定的位置用于获得可用于确定片段中另一未定位图像的位置的其它信息，依此类推，直到片段完成。

7. 发明授权

US07430497B2 Statistical model for global localization 有权
标题翻译：全球定位统计模型
公开(公告)号：US07430497B2
公开(公告)日：2008-09-30
申请号：US10284421
申请日：2002-10-31
申请人： Jian Wang , Zheng Chen , Xiaoxu Ma , Yingnong Dang , Liyong Chen , Jiang Wu
发明人： Jian Wang , Zheng Chen , Xiaoxu Ma , Yingnong Dang , Liyong Chen , Jiang Wu
IPC分类号： G06F17/00
CPC分类号： G06F3/03545 , G06F3/0321 , G06K9/222
摘要： A system and process for determining the location of a captured image from a larger image is described. Using a list of determined locations, the system is able to determine the best or most likely path of a pen tip.
摘要翻译：描述用于确定来自较大图像的拍摄图像的位置的系统和过程。使用确定位置的列表，系统能够确定笔尖的最佳或最可能的路径。

8. 发明授权

US07400777B2 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：US07400777B2
公开(公告)日：2008-07-15
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： G06K9/40
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写入介质的背景的像素的亮度之间的对比度差异来生成掩模。

9. 发明申请

US20060215913A1 Maze pattern analysis with image matching 审中-公开
标题翻译：迷宫图案分析与图像匹配
公开(公告)号：US20060215913A1
公开(公告)日：2006-09-28
申请号：US11089189
申请日：2005-03-24
申请人： Jian Wang , Yingnong Dang , Liyong Chen
发明人： Jian Wang , Yingnong Dang , Liyong Chen
IPC分类号： G06K9/36 , G06K7/10 , G06K9/46 , G06K9/20
CPC分类号： G06F3/03545 , G06K9/222 , G06K19/06037 , G06K2009/226
摘要： Processes and apparatuses analyze an image of a maze pattern in order to extract bits encoded in the maze pattern by iteratively obtaining a perspective transform from the captured image plane to the paper plane. The embedded interactive data is recognized by obtaining a perspective transform between the captured image plane and paper plane based on an obtained affine transform. The perspective transform typically models the relationship between two planes more precisely than the affine transform. The number of error bits in the extracted bit matrix is typically reduced, thus enabling decoding of position information to be more efficient and robust.
摘要翻译：过程和设备分析迷宫图案的图像，以便通过迭代地获得从捕获的图像平面到纸面的透视变换来提取在迷宫图案中编码的比特。基于所获得的仿射变换，通过获取捕获的图像平面和纸面之间的透视变换来识别嵌入的交互数据。透视变换通常比仿射变换更精确地模拟两个平面之间的关系。提取的位矩阵中的错误位的数量通常被减少，从而能够对位置信息进行解码以更有效和鲁棒。

10. 发明申请

US20060182343A1 Digital pen calibration by local linearization 有权
公开(公告)号：US20060182343A1
公开(公告)日：2006-08-17
申请号：US11060120
申请日：2005-02-17
申请人： Zhouchen Lin , Liyong Chen , Jian Wang
发明人： Zhouchen Lin , Liyong Chen , Jian Wang
IPC分类号： G06K9/00
CPC分类号： G06K9/222
摘要： X-y positions of a digital pen's tip may be determined by using a calibration parameter to map the x-y positions of the respective centers of images captured by the pen's camera. The calibration parameter may be generated by iteratively calculating estimates of the calibration parameter. The iteratively calculated estimates may be based on a gradient of an error function of the iteratively generated estimates. Calibration input data may be produced by a user placing the pen tip in a fixed location on a surface, which may be a positionally encoded medium, such as paper, and then rotating the pen and/or moving the opposite end of the pen in various directions to capture multiple images for use in generating the calibration parameter. A user may perform such a calibration procedure without the need for complicated calibration equipment typically used in connection with conventional calibration techniques.

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