Abstract: The pavement distress auto detection with rapid CCD camera suffers from the complicated pavement’s background which contains greasy dirt and inclusion．The traditional image denoising algorithm suffers from the edge and texture features’ losing which seriously interrupts the reliability of the detection system．In order to overcome this problem,an algorithm for image denoising with line-type texture based on gradient enhanced diffusion was proposed．Taking account of the character of image which includes line-type texture,the structure of texture can be imported into denoising．According to the local change of gradient,the diffusion factor was defined afresh．The simulated experiment results demonstrate that the method has the superiority and staility with the line-type texture image denoising．

Key words: Image denoising,Gradient enhanced,Partial differential equations diffusion,Pavement distress