Implementation of indoor positioning using LED and dual PC cameras

We show the successful implementation of indoor positioning by using four single LEDs and dual PC cameras. Each LED having its position information is identified by the different color. The required unknown position is then calculated using the position information of the LEDs and the geometric relationship of the images on the two image sensors. And a vector estimation algorithm is also used to solve a set of four quadratic equations. To remove a fluctuating due to the quantization error of the pixel, we compute the center of an image in terms of decimal point pixel and it brings the accuracy improvement.