1 files changed, 83 insertions, 0 deletions
diff --git a/signature.hpp b/signature.hpp
new file mode 100644
index 0000000..d9899c0
--- /dev/null
+++ b/signature.hpp
@@ -0,0 +1,83 @@
+#ifndef SIGNATURE_HPP
+#define SIGNATURE_HPP
+
+#include <memory>
+#include <opencv2/core.hpp>
+
+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;
+};
+
+class signature_priv;
+class signature
+{
+private:
+    std::shared_ptr<signature_priv> p;
+    static signature_config cfg;
+    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
+    double length() const;
+    double distance(const signature &o) const;
+    bool operator ==(const signature &o) const;
+
+    /*
+     * Configure parameters for signature calculation.
+     * Please note:
+     * Comparing signatures calculated using different
+     * parameters gives no meaningful results.
+     *
+     * If never called, a default configuration is used.
+     * See signature.cpp.
+     */
+    static void configure(signature_config _cfg);
+    /*
+     * Get current signature calculation parameters.
+     * If it's never set explicitly, the default configuration
+     * is returned.
+     */
+    static signature_config config();
+    static signature from_file(const char *fn);
+
+    /*
+     * 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);
+
+    /*
+     * 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);
+
+    friend class signature_priv;
+    friend struct signature_hash;
+};
+
+struct signature_hash
+{
+    size_t operator()(signature const& sig) const noexcept;
+};
+
+#endif