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//Chris Xiong 2022
//License: MPL-2.0
#ifndef SIGNATURE_HPP
#define SIGNATURE_HPP
#include <memory>
#include <filesystem>
#include <string>
struct signature_config
{
int slices;
int blur_window;
int min_window;
bool crop;
bool compress;
double pr;
double noise_threshold;
double contrast_threshold;
double max_cropping;
};
namespace cv
{
class Mat;
};
class signature_priv;
class signature
{
private:
std::shared_ptr<signature_priv> p;
signature(signature_priv* _p);
signature(const signature&)=default;
signature& operator=(const signature&)=default;
public:
signature();
~signature();
signature(signature&&)=default;
signature& operator=(signature&&)=default;
signature clone() const;//do not use unless absolutely needed
void dump() const;
bool valid() const;
double length() const;
double distance(const signature &o) const;
bool operator ==(const signature &o) const;
std::string to_string() const;
static signature from_string(std::string &&s);
static signature from_path(const std::filesystem::path &path, const signature_config &cfg);
static signature from_file(const char *fn, const signature_config &cfg);
/*
* Input will be stripped of alpha channel (by blending with white),
* converted to single channel (rgb2gray).
* Then it will be passed to from_preprocessed_matrix.
* The matrix doesn't have to be continuous.
*/
static signature from_cvmatrix(cv::Mat *m, const signature_config &cfg);
/*
* Input must be a single channel, floating point matrix
* (values clamped to 0-1)
* The matrix must be continuous if cropping is used
* STILL *Will* be cropped if config().crop == true
* STILL *Will* be blurred if config().blur_window > 1
*/
static signature from_preprocessed_matrix(cv::Mat *m, const signature_config &cfg);
static signature_config default_cfg();
friend class signature_priv;
friend struct signature_hash;
};
struct signature_hash
{
size_t operator()(signature const& sig) const noexcept;
};
#endif
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