Laser width-height detection system uses laser ranging principle to detect width and height of moving vehicle

and the measured signal is mixed larger vehicles edge optical noise

which reduce measurement accuracy of system. In view of time-frequency local properties of wavelet analysis

wavelet analysis method is applied to application of high-frequency optical noise interference eliminating

to improve accuracy of width-height of vehicle laser detection system. And through simulation and verification of wavelet analysis tool in Matlab

prove that eliminate influence of light and noise on the system has reached the purpose of improving measurement accuracy.