National Chung Shan Institute of Science and Technology

Wei-Kuo Chang

Yi-Yuh Hwang

Li-Chung Liu

The present invention is to provide a method of precisely comparing and positioning speckle patterns, which calculates light intensities of the speckle patterns, is capable of enhancing positioning accuracy of the speckle patterns, and is applicable to various navigation input devices for various types of notebook computers, multi-function keyboard and TV remote control.

Method of precisely comparing and positioning speckle patterns

The present invention mainly provides a precision calibration method for being applied in a high-precise rotary encoder system, wherein the primary technology feature of the precision calibration method is that: using a laser speckle image capturing module to capture N frames of laser speckle image from an optical position surface of a rotary encoding body, and then using image comparison libraries and particularly-designed mathematical equations to calculate N number of displacement vectors based on the N frames of laser speckle image, so as to eventually calculate N number of angle coordinates corresponding to the N frames of laser speckle image based on the plurality of displacement vectors. Moreover, a rotation matrix is further proposed and used in this precision calibration method, and used for treating the displacement vectors with a displacement vector transforming process in order to effectively enhance the position precision of the high-precise rotary encoder system.

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Taoyuan, Taiwan

Wei-Kuo Chang