Two-dimensional Phase Unwrapping Method Using Cost Function of L0 Norm

International Symposium on Earth Observation for One Belt and One Road

地球科学;政治学;社会学;经济学

Gao, J.^1,2 ; Li, L.^3 ; Shi, L.^3

College of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing

210023, China^1

Health Services Network Systems Engineering Research Centre of Education Ministry, Nanjing

210023, China^2

College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing

210023, China^3

关键词: Continuous phase;    Convergence speed;    Data partitioning strategies;    High-frequency informations;    Minimum-norm methods;    Normal direction;    Phase unwrapping methods;    Phase-discontinuities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/57/1/012041/pdf
DOI  :  10.1088/1755-1315/57/1/012041

来源: IOP

【 摘 要 】

Considering cost model and convergence speed of the minimum norm unwrapping, a highly efficient two-dimensional global phase unwrapping method optimized with L0norm is proposed. As analysing features of cost model in phase unwrapping with minimum norm, a cost function definition is provided in line with the L0norm, which impose a stronger constraint in the tangent direction of phase discontinuity boundary than that in normal direction, in order to preserve integrity of discontinuity during iterative unwrapping processing for continuous phase. For the sake of slow speed of low-frequency error convergence during linear solving, a data partitioning strategy is introduced into unwrapping processing. Due to independence of minimum norm method in blocks, linear solving only focus on high-frequency information and improve efficiency of iterative work, and the low-frequency processing part is transferred to offsetting-aligning between blocks. With experiments and analysis, reliability and efficiency of the novel phase unwrapping method are certified comparing to existing methods.