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    • 7. 发明授权
    • Method, apparatus, computer program and storage medium for recording a movement of a user unit
    • 用于记录用户单元的移动的方法,装置,计算机程序和存储介质
    • US07865043B2
    • 2011-01-04
    • US10582996
    • 2004-12-16
    • Andreas BjörklundTorbjörn GärdenforsTomas Edsö
    • Andreas BjörklundTorbjörn GärdenforsTomas Edsö
    • G06K9/20
    • G06K19/06037G06F3/0321G06F3/03545G06K9/22G06K2009/226
    • A position code is recorded by capturing a sequence of images while writing on the base with a user unit. The position code may be decoded to a sequence of absolute positions reflecting the movement of the user unit over the base. If the position code in any image is not sufficiently recorded, e.g. because it is obscured by other graphics on the base, the spatial relationship of the image to another image in the sequence is determined. If the position code in this other image in the image sequence is decodable to an absolute position, the absolute position of the image in which the position code is not decodable could nevertheless be determined by using the spatial relationship. In this way the movement of the user unit can be recorded even though the position code is obscured, which could be the case when the same printing ink is used for both the position code and other graphics on the base.
    • 通过在用户单元写入基座时捕获图像序列来记录位置代码。 位置码可以被解码为反映用户单元在基座上的移动的绝对位置序列。 如果任何图像中的位置代码未被充分记录,例如 因为它被基础上的其他图形遮蔽,所以确定了图像与序列中另一图像的空间关系。 如果图像序列中该另一图像中的位置码可解码为绝对位置,则可以通过使用空间关系来确定位置码不能解码的图像的绝对位置。 以这种方式,即使位置代码被遮蔽也可以记录用户单元的运动,这可能是当相同的印刷油墨用于基座上的位置代码和其他图形时的情况。