Method of calculating sub-pixel movement and position...

Details Method of calculating sub-pixel movement and position... Method of calculating sub-pixel movement and position...

2007-03-13

2007-03-13

Mehta, Bhavesh M. (Department: 2624)

Image analysis

Applications

Motion or velocity measuring

C382S103000, C345S166000

Reexamination Certificate

active

10975942

ABSTRACT:
The present invention discloses a method of calculating sub-pixel movement and a position tracking sensor using the same. The method includes: setting a reference frame and receiving a current surface image illuminated by light as a sample frame; calculating correlation between the reference frame and the sample frame to obtain a movement value; when the calculated movement value is above a first value, updating the reference frame to the sample frame, and when above a second value, recognizing a movement value of the sample frame with respect to the reference frame; and calculating the movement value of the sample frame with respect to an auxiliary reference frame, and updating the auxiliary reference frame to the sample frame in association with the movement calculation of the sample frame to the reference frame, and when the calculated movement value is above a third value, recognizing the movement value of the sample frame with respect to the auxiliary reference frame. Therefore, by adding and using the auxiliary reference frame separately from the reference frame, resolution to the movement of the optical mouse is enhanced and performance of the optical mouse using the same is significantly improved.

REFERENCES:
patent: 5586202 (1996-12-01), Ohki et al.
patent: 6664948 (2003-12-01), Crane et al.
patent: 1283492 (2003-02-01), None
English Abstract from communication from Taiwan Patent Office dated Oct. 13, 2006.

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