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    • 10. 发明申请
    • Navigation system and navigation method
    • 导航系统和导航方法
    • US20050060668A9
    • 2005-03-17
    • US10411094
    • 2003-04-11
    • Bang LeeJong Kwak
    • Bang LeeJong Kwak
    • G06F3/03G06F3/033G06F9/26G06F9/32G06F12/00G09G5/00
    • G06F3/0317
    • Disclosed are a navigation system and a navigation method, wherein the navigation method comprises the steps of sequentially providing image frames containing navigation information and generating electric signals corresponding to a position of an optical sensor, storing a first image frame into a reference frame memory as a reference frame, storing an input image frame subsequent to the first image frame into an input frame memory as a current input frame, setting a mask window having a predetermined size on the reference frame, obtaining correlation values over all the pixels on the current input frame by a full search comparison method, by moving the mask window on the current input frame pixel by pixel, calculating X-axis and Y-axis displacements of a pixel having the greatest correlation value of all the pixels, and updating the reference frame using the current input frame stored in the input frame memory. The navigation system and the navigation method in accordance with the present invention may change input frame selection period based on movement speed of an optical mouse, so that it is possible to detect movement of an optical mouse without changing sampling speed of an optical sensor even when an optical mouse moves fast. Further, the navigation system and the navigation method in accordance with the present invention may consume low power in comparison with a conventional navigation system and method, and reduce noises existed in an optical mouse.
    • 公开了一种导航系统和导航方法,其中导航方法包括以下步骤:顺序地提供包含导航信息的图像帧并产生对应于光学传感器的位置的电信号,将第一图像帧存储到参考帧存储器中作为 参考帧,将第一图像帧之后的输入图像帧存储到作为当前输入帧的输入帧存储器中,在参考帧上设置具有预定大小的掩码窗口,获得当前输入帧上的所有像素上的相关值 通过全搜索比较方法,通过逐像素地移动当前输入帧上的掩码窗口,计算具有所有像素的最大相关值的像素的X轴和Y轴位移,并且使用 当前输入帧存储在输入帧存储器中。 根据本发明的导航系统和导航方法可以基于光学鼠标的移动速度来改变输入帧选择周期,使得即使当光学鼠标的移动速度变化时也可以检测光学鼠标的移动而不改变光学传感器的采样速度 光电鼠标移动快。 此外,与传统的导航系统和方法相比,根据本发明的导航系统和导航方法可以消耗低功率,并且减少光学鼠标中存在的噪声。