[2] Freeman W T,Adelson E H. The design and use of steerable filters.IEEE Trans. PAMI.,1991,13(9): 891-906
[3] Hearn D, Baker M. Computer Graphics. Beijing: Tsinghua University Press,1998: 323_325
[2] Freeman W T,Adelson E H. The design and use of steerable filters.IEEE Trans. PAMI.,1991,13(9): 891-906
[3] Hearn D, Baker M. Computer Graphics. Beijing: Tsinghua University Press,1998: 323_325
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