Optical navigation device and related automatic magnification adjusting method
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United States of America Patent
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Nov 14, 2017
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app pub date -
Jan 21, 2015
filing date -
Jan 21, 2015
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Abstract
An automatic magnification adjusting method is applied to an optical navigation device. The optical navigation device has an illumination channel, a reference channel and an imaging channel. The reference channel has a reference feature with a known parameter. The automatic magnification adjusting method includes driving the illumination channel and the reference channel to alternatively output a detecting image and a reference image, capturing a series of navigation images consisting of the detecting image and the reference image by the imaging channel, analyzing the reference image to recognize the reference feature, calculating a compensating factor according to a detected parameter of the reference feature, and adjusting magnification of the detecting image by the compensating factor to output corresponding coordinate displacement.
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