Essay Example on DWT Towards Appearance Enhancement of Underwater Images

DWT Towards Appearance Enhancement of Underwater Images Abstract Processing of underwater images has received a great attention among the researchers in recent years In oceanic environment capturing a clear underwater image is having a crucial importance Absorption and scattering are the major degrading factors for underwater images The qualities of underwater images are affected by color cast poor visibility and foggy appearance and misty In order to overcome those limitations an underwater image enhancement technique built on a DWT method is proposed The aim of the proposed algorithm is to improve the quality of underwater images In this paper 100 different images are used to perform the comparison of the proposed technique with the previous techniques Performance of the proposed method of DWT is evaluated using the Structural Similarity Index SSIM Entropy and Absolute Mean Brightness Error AMBE Performance measurement of the Wavelet techniques produces better enhancement results than previous techniques like Histogram Equalization HE and Contrast Limited Adaptive Histogram 

Both the color corrected and contrast enhanced images are decomposed into low and high frequency components by using three scale wavelet operator The low and high frequency components are fused through a multiscale fusion process The low frequency components are fused by weighted average and the high frequency components are fused by local variance The fused low and high frequency components can be reconstructed as final enhanced image Finally the proposed algorithm can improve the appearance of underwater images John Y Chiang and Ying Ching Chen 2012 4 have discussed a new method specifically developed for image enhancement In this paper the WCID algorithm is proposed to restore the image color balance and remove haze In Histogram equalization method and dehazing the removal of haze color balancing capabilities and image dehazing WCID are traditional Ali A Yassin Rana M Ghadban et al 2013 6 proposed a new method for enhancing the underwater Images In this paper a new approach is presented which depends on DWT HSV color space and slide stretching The Input image is transformed to the HSV and the DWT is applied on the H channel Apply contrast stretching on H channel Then stretched the transform of Hue channel to spatial domain stretched the saturation and value channel Then