--- a
+++ b/src/image.h
@@ -0,0 +1,36 @@
+#include "Rcpp.h"
+#include <opencv2/opencv.hpp>
+#include "opencv2/xfeatures2d.hpp"
+#include "opencv2/features2d.hpp"
+#include "opencv2/shape/shape_transformer.hpp"
+
+#ifndef IMAGE_H
+#define IMAGE_H
+
+////
+// Processing
+////
+
+cv::Mat preprocessImage(cv::Mat &im, const bool invert, const char* flipflop, const char* rotate);
+cv::Mat reversepreprocessImage(cv::Mat &im, const char* flipflop, const char* rotate);
+  
+////
+// Warping
+////
+  
+Rcpp::RawVector warpImage(Rcpp::RawVector ref_image, Rcpp::RawVector query_image, 
+                          Rcpp::List mapping,
+                          const int width1, const int height1,
+                          const int width2, const int height2);
+
+Rcpp::RawVector warpImageAuto(Rcpp::RawVector ref_image, Rcpp::RawVector query_image, 
+                              Rcpp::List mapping,
+                              const int width1, const int height1,
+                              const int width2, const int height2);
+
+Rcpp::RawVector warpImageManual(Rcpp::RawVector ref_image, Rcpp::RawVector query_image, 
+                                Rcpp::List mapping,
+                                const int width1, const int height1,
+                                const int width2, const int height2);
+
+#endif
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