3D palmprint recognition method is proposed based on improved Contourlet transform. Through the shape index,the method maps 3D palmprint image into gray image to overcome the shortcomings of conventional mean or Gaussian curvature mapping that the characteristics of 3D palmprint image are difficult to accurately describe. Based on this, it introduces 7/5 filter to Contourlet transform, and extracts the mean and variance of each directional subband from the shape index map in the transform domain as feature ...