00001 #ifndef bsta_otsu_threshold_h_ 00002 #define bsta_otsu_threshold_h_ 00003 //: 00004 // \file 00005 // \brief Implements Otsu's threshold method for 1D distribution and 2 classes 00006 // \author Vishal Jain, (vj@lems.brown.edu) 00007 // \date April 09, 2005 00008 // 00009 // The Otsu thresholding method maximizes the between class variance by 00010 // an exhaustive linear scan over the histogram bin indices 00011 // 00012 // \verbatim 00013 // Modifications 00014 // Templated and moved up to bsta - J.L. Mundy June 29, 2005 00015 // \endverbatim 00016 00017 #include<vcl_vector.h> 00018 #include<bsta/bsta_histogram.h> 00019 00020 template <class T> class bsta_otsu_threshold 00021 { 00022 public: 00023 // constructor 00024 bsta_otsu_threshold(bsta_histogram<T> const& hist); 00025 //: takes vector of data as input 00026 bsta_otsu_threshold(vcl_vector<T> data, T low , T high); 00027 // destructor 00028 ~bsta_otsu_threshold(); 00029 00030 unsigned bin_threshold() const; 00031 00032 T threshold() const {return distribution_1d_.avg_bin_value(this->bin_threshold());} 00033 00034 protected: 00035 //: default constructor doesn't make sense 00036 bsta_otsu_threshold() : distribution_1d_(bsta_histogram<T>(0,0)){} 00037 00038 bsta_histogram<T> distribution_1d_; 00039 }; 00040 00041 #define BSTA_OTSU_THRESHOLD_INSTANTIATE(T) extern "Please #include <bsta/bsta_otsu_threshold.txx>" 00042 00043 #endif // bsta_otsu_threshold_h_
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