光学精密工程2017，Vol.25Issue(8)：2182-2194,13.DOI:10.3788/OPE.20172508.2182
多尺度引导滤波及其在去雾中的应用
Multi-scale guided filter and its application in image dehazing
摘要
Abstract
With combining guided filter and lifting wavelet effectively, a multi-scale guided filter was proposed to smooth the details of a color image and to keep the edges of the image unambiguous.The lifting wavelet was used to decompose the color image in multi-scale.It means that the image was decomposed into a low frequency subband and a plurality of high frequency subbands.In the reconstruction process of the lifting wavelet, the low-frequency information of each scale was smoothed by the guide filter and the edges were not blurred.Finally, the reconstructed image was processed by the guided filter once more to remove the residual details as soon as possible.The proposed multi-scale guided filter method was applied to the image haze removal using dark channel prior and its processing results were evaluated in subjectivity and objectivity.The results show that the multi-scale guided filter smoothes the image''s details and maintains the edge integrity.It improves the visual effect of the image in whole, enhances the image contrast and visual effect.Moreover, it recovers the scene information and preserves the edge information of the scene.At the same time, the objective evaluation indexes are improved, in which, the contrast enhancement coefficient index is improved by 0.1 or more, the restoration ability of the scene structure information is increased by more than 1 and the Light Order error(LOE) is reduced by more than 10.It satisfies the visual needs of the application in image dehazing.关键词
引导滤波/提升小波/多尺度引导滤波/图像去雾Key words
guided filter/lifting wavelet/multi-scale guided filter/image dehazing分类
信息技术与安全科学引用本文复制引用
武昆,韩广良,杨航,王宇庆,吴笑天..多尺度引导滤波及其在去雾中的应用[J].光学精密工程,2017,25(8):2182-2194,13.基金项目
国家自然科学基金资助项目(No.61401425) （No.61401425）
