| 摘要 |
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.
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