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vq.h
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00001 
00029 #ifndef VQ_H
00030 #define VQ_H
00031 
00032 #include <itpp/base/vec.h>
00033 #include <itpp/base/sort.h>
00034 #include <itpp/base/math/log_exp.h>
00035 
00036 namespace itpp
00037 {
00038 
00039 
00062 class Vector_Quantizer
00063 {
00064 public:
00066   Vector_Quantizer();
00068   Vector_Quantizer(const char *Name);
00070   int encode(const vec &x);
00072   ivec encode(const vec &x, int num);
00074   vec decode(int Index) const;
00076   Array<vec> decode(const ivec &Index) const;
00078   vec Q(const vec &x);
00080   vec operator()(const vec &x);
00082   void set_codebook(const mat &CB);
00084   mat get_codebook() const;
00086   void set_codevector(int Index, const vec &indata);
00088   vec get_codevector(int Index) const;
00090   void modify_codevector(int no, double mul, const vec &add);
00092   int size() const;
00094   int dim() const;
00096   int nobits() const;
00103   void load(const char *Name);
00110   void save(const char *Name) const;
00112   double latest_distortion();
00113 protected:
00115   vec CodeBook;
00117   int Size;
00119   int Dim;
00121   double LatestDist;
00122 };
00123 
00124 // INLINE FUNCTIONS
00125 
00126 inline int Vector_Quantizer::size() const { return Size; }
00127 inline int Vector_Quantizer::nobits() const { return levels2bits(Size); }
00128 inline int Vector_Quantizer::dim() const { return Dim; }
00129 inline double Vector_Quantizer::latest_distortion() { return LatestDist; }
00130 inline vec Vector_Quantizer::decode(int Index) const { return get_codevector(Index); }
00131 inline vec Vector_Quantizer::Q(const vec &x) { return decode(encode(x)); }
00132 inline vec Vector_Quantizer::operator()(const vec &x) { return Q(x); }
00133 
00152 class Scalar_Quantizer
00153 {
00154 public:
00156   Scalar_Quantizer();
00158   Scalar_Quantizer(const char *Name);
00160   int encode(double x) const;
00162   ivec encode(const vec &x) const;
00164   double decode(int Index) const;
00166   vec decode(const ivec &Index) const;
00168   double Q(double x) const;
00170   vec Q(const vec &x) const;
00172   double operator()(double x) const;
00174   vec operator()(const vec &x) const;
00176   void set_levels(const vec &L);
00178   vec get_levels() const;
00180   int size() const;
00181 protected:
00183   vec Levels;
00185   double LatestDist;
00186 };
00187 
00188 inline int Scalar_Quantizer::size() const { return Levels.length(); }
00189 inline double Scalar_Quantizer::decode(int Index) const { return Levels(Index); }
00190 inline double Scalar_Quantizer::Q(double x) const { return decode(encode(x)); }
00191 inline double Scalar_Quantizer::operator()(double x) const { return Q(x); }
00192 inline vec Scalar_Quantizer::operator()(const vec &x)  const { return Q(x); }
00193 inline void Scalar_Quantizer::set_levels(const vec &L) {Levels = L;sort(Levels); }
00194 inline vec Scalar_Quantizer::get_levels() const {return Levels; }
00195 
00197 int scalar_encode(double x, vec &Levels) ;
00199 ivec scalar_encode(vec &x, vec &Levels);
00201 inline double scalar_quantize(double x, vec &Levels) { return Levels(scalar_encode(x, Levels)); }
00203 inline vec scalar_quantize(vec &x, vec &Levels) { return Levels(scalar_encode(x, Levels)); }
00204 
00205 
00206 } // namespace itpp
00207 
00208 #endif // #ifndef VQ_H
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