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//
// Zinnia: Online hand recognition system with machine learning
//
// $Id: feature.h 17 2009-04-05 11:40:32Z taku-ku $;
//
// Copyright(C) 2008 Taku Kudo <taku@chasen.org>
//
#ifndef zinnia_FEATURE_H__
#define zinnia_FEATURE_H__
namespace zinnia {
class Character;
struct FeatureNode {
int index;
float value;
};
inline double dot(const FeatureNode *x1,
const FeatureNode *x2) {
double sum = 0;
while (x1->index >= 0 && x2->index >= 0) {
if (x1->index == x2->index) {
sum += (x1->value * x2->value);
++x1;
++x2;
} else if (x1->index < x2->index) {
++x1;
} else {
++x2;
}
}
return sum;
}
struct Node {
float x;
float y;
};
class Features {
private:
std::vector<FeatureNode> features_;
struct NodePair {
const Node *first;
const Node *last;
NodePair(): first(0), last(0) {}
};
void makeBasicFeature(int id, const Node *first, const Node *last);
void makeMoveFeature(int id, const Node *first, const Node *last);
void makeVertexFeature(int id, std::vector<NodePair> *node_pairs);
void getVertex(const Node *first, const Node *last,
int id, std::vector<NodePair> *node_pairs) const;
void addFeature(int index, float value);
public:
bool read(const Character &character);
const FeatureNode *get() const { return &features_[0]; }
};
}
#endif
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