Light tracing method and apparatus thereof
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United States of America Patent
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Oct 31, 2017
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Sep 25, 2013
filing date -
Sep 25, 2013
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Abstract
Disclosure is related to a light tracing method, and an apparatus thereof. According to one embodiment of the invention, the apparatus is such as an optical indexer. The method for determining a moving direction is performed based on an optical constructive or destructive interference pattern made by reflected lights received by a sensor chip. In particular, the coherent light may be preferably used in order to enhance the interference effect. In an exemplary embodiment, the method includes firstly the sensor pixels in the sensor chip receiving the reflected light, and calculating the energy. Next, within a time slot, the energy state of each sensor pixel can be calculated. A moving vector may be determined from a difference between the binary energy states of the adjacent sensor pixels. The binary energy state is based on a comparison between every sensor pixel and a statistic average within the sampling time slot.
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