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How to do Extrema Detection for SIFT in java ?

Hey guys i working for implementation of SIFT algorithm with openCV 2.4.9 in Netbeans java, i was do try calculate Diffirence of Gaussian for search scale space extrema on SIFT Algorithm. The next question is after calculate DoG it must find Maxima and Minima point in each DoG how to do this in java ? Thank you before