Removing Shadows from Urban Aerial Images Based on Fuzzy Retinex
Xiao Zhi-ji · Dianzi xuebao · 2005
In urban aerial images,the poor visibility of features in shadowed regions creat ed by buildings prevents recognition of objects.It is necessary to compensate an d remove the shadowed region.In this paper,a fuzzy retinex is proposed to overco me the limitation of the well known image enhancement technique—retinex.The fuz zy retinex restricts the center/surround spatially contrast operation in region with homogeneous illumination so that the robustness of retinex is reinforced in scene with strongly variational illumination.Based on the fuzzy segmentation of an image into shadowed and unshadowed regions,shadows are compensated and remov ed using the fuzzy retinex while the natural tint of original image is retained. The proposed method enriches the research and application domain of the retinex. Experimental results are given to show its effectiveness.