Abstract

We propose a camera based indoor visible light positioning (VLP) system with high accuracy. The LED transmitters send unique location codes, and the camera based receiver utilizes the image processing techniques to identify the codes. In order to control the flicker due to the limited frame rate of a commercial camera, we use an optical neutral density filter (ONDF) to attenuate the light and ensure the sensor operates in a large linear dynamic range without saturation. In such a way, LEDs are allowed to be modulated at a small modulation depth even at high optical intensity while filter-attenuated signal can still be captured by the image sensor. Meanwhile human eyes can not perceive the flicker due to the small intensity variation. Experimental results based on a 640×480 pixel resolution camera show that the localization error is within 17cm in 90% of test cases without any flicker.

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