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In this work, an effective smartphone image sensor and double LED luminaires based visible light positioning method has proposed. Therefore, it provides higher positioning accuracy via the design of a flicker-free multiple frequency shift keying line coding modulation technique. We also analyze the performance of our system for different handhold situations of a smartphone during the experiment to utilize the rolling shutter mechanism of the complementary metal-oxide-semiconductor image sensor. Experimental results from the proposed system can provide accuracy for the flat situation of the mobile phone 3.25 cm and 5.1 cm for the to-degree tilt laying situation of mobile phone.