Image analysis – Pattern recognition – On-line recognition of handwritten characters
Reexamination Certificate
2007-08-27
2009-08-04
Ahmed, Samir A. (Department: 2624)
Image analysis
Pattern recognition
On-line recognition of handwritten characters
C345S179000, C382S100000
Reexamination Certificate
active
07570813
ABSTRACT:
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.
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Chen Liyong
Dang Yingnong
Ma Xiaoxu
Wang Jian
Wang Qiang
Ahmed Samir A.
Microsoft Corporation
Perkins Coie LLP
Tsai Tsung-Yin
LandOfFree
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