A novel image denoising algorithm based on the satistical model in Contourlet transform domain is proposed,which can obtain comparatively clear pavement crack information under the complicated background.The conclusion that the Contourlet coefficients obey the Laplacian distribution is derived on the statistical theory of χ2 hypothesis testing.Moreover,the shrink formula for the Contourlet coefficients of noisy images is deduced based on Bayesian maximum posterior estimation.The experiment resul...