Multiple light sources cause the low visibility in the brightest region in nighttime images

a glow term was defined in the traditional atmospheric scattering model.A defogging model was constructed for nighttime foggy images.Based on the model

a nighttime image defogging algorithm was proposed.The algorithm decomposed the original image into a nighttime foggy image layer and a glow image layer

and then the color-shift correction operation and the guided filter were applied for the foggy image layer.Thus

the defogging results can be obtained.Comparisons with dark channel prior method

fast median filter method

image color transfer method

and nighttime imaging model method verified the effectiveness of the proposed algorithm.This algorithm can be applied in such devices as vehicle collision avoidance systems

traffic surveillance systems

and other recognition systems.