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US 2003/0193529 A1Published application
Navigation system and navigation method
AssigneesSamsung Electro-Mechanics Co., Ltd., Atlab Inc.
InventorsBang Won Lee, Jong Taek Kwak
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AssigneesSamsung Electro-Mechanics Co., Ltd., Atlab Inc.
InventorsBang Won Lee, Jong Taek Kwak
Estimating the term…
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.
The navigation method comprising the steps of:
A navigation system comprising:
Dependencies are inferred from the claim text.
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Detection arrangements using opto-electronic means: in co-operation with a patterned surface, e.g. absolute position or relative movement…
Computing and data processing
Term end not estimated
1. Field of the Invention
The present invention relates to a navigation system and a navigation method, and more particularly to a navigation system and a navigation method capable of changing input frame selection period based on movement speed of an optical mouse, wherein pixel mapping is performed by comparing all the pixels in a current input frame with all the pixels in a reference frame.
2. Description of the Related Art
The above and other features and advantages of the present invention will become readily apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
FIG. 1 is a schematic view of an optical mouse in accordance with the conventional art;
FIG. 2 is a schematic view showing a pixel mapping method for obtaining correlation values between a reference frame and a current input frame (sample frame) in accordance with the conventional art;
Korean Patent Application No. 2002-20132 and 2002-20133, filed on Apr. 12, 2002, and entitled: “Navigation Method and Navigation System,” is incorporated by reference herein in its entirety.
Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the drawings.
FIG. 3 illustrates a pixel mapping method for obtaining correlation values between a reference frame and a current input frame.