关键词: 矩阵值数据场, 非线性结构张量, 结构信息, 曲率保持

Abstract: A new curvature-preserving diffusion based nonlinear structure tensor calculation method is proposed.At first，three requirements of nonlinear structure tensor algorithms are presented，based on which the defects of the divergence-based nonlinear structure tensor and the trace-based nonlinear structure tensor，in corner information extraction，are pointed out.After that，this paper smoothes the structure tensor with an extended curvature-preserving PDE method and gets the new nonlinear structure tensor，which is capable of structure estimation.Experimental results show that the method can produce better local structure estimation results.

Key words: matrix-valued data field, nonlinear structure tensor, structure information, curvature preserving