Pointing device and displacement estimation method

Details Pointing device and displacement estimation method Pointing device and displacement estimation method

2004-06-24

2008-08-26

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

C345S157000, C345S158000, C345S163000

Reexamination Certificate

active

07417623

ABSTRACT:
A method of estimating image displacement by block matching for a pointing device used in a computer system. The method provided in the present invention comprises capturing digital images sequentially using a photo capture device, obtaining a template frame and a current frame, estimating a predicted velocity vector, and computing the displacement of the image. The efficiency and reliability of block match searching are improved by reducing the search range according to the calculated displacement. The template block can be defined anywhere on the template frame according to the predicted velocity to extend the lifetime of the template frame, and the displacement vector between the template block and the center of the template frame is proportional to the predicted velocity.

REFERENCES:
patent: 4734685 (1988-03-01), Watanabe
patent: 5621434 (1997-04-01), Marsh
patent: 6950094 (2005-09-01), Gordon et al.
patent: 7042439 (2006-05-01), Luo

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