Aiming at problem that dark channel prior algorithm is computational complex and quite time consuming

can ’t meet the demand of real-time in traffic surveillance system

and atmospheric light is easily affected by the white object

the limitation of distortion happens in the sky area and also the Halo phenomenon in the scene boundaries

a new defogging algorithm is proposed based on guided filtering

which firstly uses quad-tree search algorithm to accurately estimate atmospheric light and then uses the difference image obtained by the maximum value filtering to compensate the transmission rate in the sky area. Combine atmosphere physical scattering model to recover the haze-off image. Experimental result proves that the improved algorithm improves dehazing effect

at the same time

increase rate of algorithm.