A novel enhancement method for fog-degraded images based on DBLA
Ming Gao, Yaobin Zou, Bangjun Lei, Guangzhu Xu · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2016
This letter presents a novel enhancement method for fog-degraded images based on dominant brightness level analysis in analyzing the characteristics of the images captured by daylight sensor on photoelectric radar surveillance system. We first perform discrete wavelet transform(DWT) on the input images and perform contrast limited adaptive histogram equalization(CLAHE) operation on LL sub-band, and then decompose the LL sub-band into low-,middle-,and high-intensity layers using Gaussian filter. After the intensity transformation and inverse DWT, the resulting enhanced image is obtained by using the guided filter.