| 摘要 |
Reflected laser light having a speckle pattern is received in a pixel array. Pixel outputs are combined into series representing pixel intensities along particular dimensions at times t and t+Deltat. Centroids for each series can be identified, and vectors determined for movement of centroids from time t to time t+Deltat. Crossing points may alternatively be identified for data within each series relative to a reference value for that series, and vectors determined for movement of crossing points from time t to time t+Deltat. A probability analysis may be used to extract a magnitude and direction of array displacement from a distribution of movement vectors. A series of data values corresponding to time t+Deltat may alternatively be correlated to advanced and delayed versions of a series of data values corresponding to time t. The highest correlation is then used to determine movement.
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