AIG Based Nonlinear Anisotropic Smoothing Strategy for Vector-Valued Images

• 作 者: ZHANG Xiang-fen TIAN Wei-feng CHEN Wu-fan YE Hong
• 机 构: Depatment of Electronic Engineering, Shanghai Normal University, Shanghai 201418, China;Department o
• 出 处: 上海交通大学学报（英文版）
• 发表日期: 2009年2期
• 关键词: diffusion tensor imaging (DTI) affine invariant gradient (AIG) afline invariant

The effects of the Rician noise on the calculated tensors are analyzed and an affine invariant gradient (AIG) based nonlinear anisotropic smoothing strategy is presented. The AIG based smoothing strategy is a development of the affine invariant nonlinear anisotropic diffusion (AINAD) restoration model, introduced by Guillermo Sapiro, and adopted to restore vector-valued data. To evaluate the efficiency of the presented AINAD model in accounting for the Rician noise introduced into the vector-valued data, the peak-to-peak signal-to-noise ratio (PSNR), signal-to-mean squared error ratio (SMSE) and Beta(parameter that stands for edge preservation) metrics are used. The experiment results acquired from the synthetic and real data prove the good performance of the presented filter.