There are sometimes shadows

such as cars、trees and buildings

on road surface images

which make it difficult to abstract and recognize the features. After analyzing the shortages of Center/Surround Retinex(CSR) algorithm and shadow removal approaches based on Retinex in existence

an Anisotropic Diffusion Center/Surround Retinex(ADCSR) is presented to solve the problem. First anisotropic diffusion based on PDE is introduced to ADCSR

further a new anisotropic diffusion scheme based on “Edge Degree”(ED) is presented

which avoids the embarrassment to select different parameters such as gradient threshold. Theoretic analysis and experimental results show that the effectiveness of the approach.