Noise removal algorithm of road surface state detection device

The invention discloses a noise removal algorithm of a road surface state detection device, which is implemented through the steps of 1, inputting a plurality of working currents Ii with a linear proportional relation to a light-emitting diode under a specific wavelength, and correspondingly obtaining a plurality of reflected light intensities Pi; 2, performing linear regression on the plurality of working currents Ii and the plurality of corresponding reflected light intensities Pi in the step 1 by using a mathematical statistical method to obtain Pi = beta * Ii + epsilon i (i = 1, 2,..., n); 3, calculating a regression coefficient beta by using a least square method; and 4, calculating the current reflectivity by using the reflected light intensity coefficient beta in the step 3. Compared with the prior art, the noise removal algorithm has the advantages that noise is removed in a least square calculation mode, the calculated reflected light intensity coefficient is a true value and is free of noise doping,