diff --git a/include/genimg/common.hh b/include/genimg/common.hh
index 7073a3b..3f9e646 100644
--- a/include/genimg/common.hh
+++ b/include/genimg/common.hh
@@ -7,6 +7,8 @@
 #include <tuple>
 #include <spdlog/spdlog.h>
 
-std::tuple<cv::Mat, cv::Mat> init_image(const std::string &t_input_file);
+std::tuple<cv::Mat, cv::Mat> init_image(std::string const &t_input_file);
+
+double euclidian_distance(cv::Mat const &t_img1, cv::Mat const &t_img2);
 
 #endif /* GENETIC_IMAGE_INCLUDE_GENIMG_COMMON_HH_ */
diff --git a/src/common.cc b/src/common.cc
index 89231c3..a29fec6 100644
--- a/src/common.cc
+++ b/src/common.cc
@@ -1,9 +1,10 @@
 #include "common.hh"
+#include <cassert>
+#include <cmath>
 #include <cstdlib>
 
-std::tuple<cv::Mat, cv::Mat> init_image(const std::string &t_input_file) {
-  cv::Mat input_image =
-      cv::imread(t_input_file, cv::IMREAD_COLOR);
+std::tuple<cv::Mat, cv::Mat> init_image(std::string const &t_input_file) {
+  cv::Mat input_image = cv::imread(t_input_file, cv::IMREAD_COLOR);
   if (!input_image.data) {
     spdlog::critical("Could not open or find image!\n");
     exit(-1);
@@ -15,3 +16,15 @@ std::tuple<cv::Mat, cv::Mat> init_image(const std::string &t_input_file) {
                         CV_8UC3, cv::Scalar(0, 0, 0));
   return std::make_tuple(std::move(input_image), process_image);
 }
+
+double euclidian_distance(cv::Mat const &t_img1, cv::Mat const &t_img2) {
+  double euclidian = 0.0;
+  for (int w = 0; w < t_img1.size().width; ++w) {
+    for (int h = 0; h < t_img1.size().height; ++h) {
+      euclidian += std::abs(std::pow(t_img1.at<uchar>(h, w), 2) -
+                            std::pow(t_img2.at<uchar>(h, w), 2));
+    }
+  }
+  euclidian = std::sqrt(euclidian);
+  return euclidian;
+}
diff --git a/src/main.cc b/src/main.cc
index e75b46f..fe501a2 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,8 +1,8 @@
-#include "parseargs.hh"
 #include "common.hh"
+#include "parseargs.hh"
 
 int main(int ac, char **av) {
-  const auto [input_file, output_file, video_output, iterations] =
+  auto const [input_file, output_file, video_output, iterations] =
       parse_args(ac, av);
   spdlog::info("Input file:\t{}", input_file);
   spdlog::info("Output file:\t{}", output_file);
@@ -10,5 +10,7 @@ int main(int ac, char **av) {
   spdlog::info("Iterations:\t{}", iterations);
   auto [input_image, process_image] = init_image(input_file);
 
+  // Launch image generation
+
   return 0;
 }