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Rainy Image Enhancement Using Modified Multistage Gaussian Filter and Weighted Median Guided Filter

Rain streaks and droplets removal from an image is quite complex. In rainy days, the performance of outdoor vision system will be degraded due to poor visibility, deformation and blurring caused by rain. In this paper, modified multi-stage Gaussian filtering technique for rain streaks removal and a method for removing rain droplets on windscreen are proposed. Rain removed image is processed using dark channel prior algorithm for haze removal. Dark channel prior is combined with triple clipped dynamic histogram equalization technique for sharpness enhancement. The proposed algorithm is compared with that of Shi et al. [6] in terms of peak signal -to- noise ratio (PSNR) and structural similarity index (SSIM). Simulation results on variety of rain streaks and rain droplets images yielded an average PSNR and SSIM values of 52dB and 0.99 respectively using the proposed algorithm as compared with 32dB and 0.96 obtained using algorithm [6].