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In this paper, a high-accuracy motion detection (MD) scheme based on a look-up table (LUT) is proposed and experimentally demonstrated in an optical camera communication (OCC) system. The LUT consists of predefined motions and strings that represent the predefined motions. The predefined motions include straight lines, polylines, circles, and number shapes. At the transmitter, the data with on-off keying (OOK) format is modulated on an 8×8 light-emitting diode (LED) array. The motion is generated by the user's finger in the free space li