Patent ID: 8538276
Filing Date: 2013-09-17
Classification: H04B

Abstract:
1. An apparatus for performing visible light communication, comprising: an image input unit configured to input image data representing an image photographed of a light source of visible light carrying transmission data, the transmission data including a preamble and a data bit train; a calculation unit configured to calculate from the image data, a luminance value at a designated position in a region of interest of the image data; a change-threshold calculation unit configured to (i) calculate a maximum luminance and a minimum luminance from the luminance value and (ii) calculate a threshold value for detecting a blinking frequency of the light source corresponding to an on-off frequency of pulse signals of the transmission data; a preamble detection unit configured to detect the preamble from the image data based on the threshold value of the luminance value; a bit train detection unit configured to detect the data bit train, from the image data, based on the threshold value and the preamble; and a reception unit configured to reproduce the transmission data based on the data bit train.