reduces class usage and impl. img diff function

Image/Diff.h

@@ -0,0 +1,47 @@
+/**
+ * Karaka
+ *
+ * @package   Image
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://karaka.app
+ */
+#ifndef IMAGE_DIFF_H
+#define IMAGE_DIFF_H
+
+#include <stdio.h>
+#include <opencv2/opencv.hpp>
+
+#include "../Utils/MathUtils.h"
+
+namespace Image {
+    namespace ImageUtils {
+        cv::Mat find_diff (cv::Mat in1, cv::Mat in2)
+        {
+            cv::Mat diff;
+            cv::absdiff(in1, in2, diff);
+
+            int th = 10;
+            cv::Mat mask(in1.size(), CV_8UC1);
+
+            for (int i = 0; i < diff.rows; ++i) {
+                for (int j = 0; j < diff.cols; ++j) {
+                    cv::Vec3b px = diff.at<cv::Vec3b>(i, j);
+                    int value    = px[0] + px[1] + px[2];
+
+                    if (value > th) {
+                        mask.at<unsigned char>(i, j) = 255;
+                    }
+                }
+            }
+
+            cv::Mat out;
+            cv::bitwise_and(in2, in2, out, mask);
+
+            return out;
+        }
+    }
+}
+
+#endif

Image/ImageUtils.h

@@ -14,11 +14,8 @@
 #include <math.h>
 
 namespace Image {
-    class ImageUtils {
-        private:
-
-        public:
-            static inline
+    namespace ImageUtils {
+        inline
         float lightnessFromRgb(int r, int g, int b)
         {
             float vR = r / 255.0;
@@ -35,7 +32,7 @@ namespace Image {
             return lStar / 100.0;
         }
 
-            static inline
+        inline
         int rgbToInt(int r, int g, int b)
         {
             int rgb = r;
@@ -44,7 +41,7 @@ namespace Image {
 
             return rgb;
         }
-    };
+    }
 }
 
 #endif

Image/Kernel.h

@@ -61,12 +61,8 @@ namespace Image {
         {-1.0 / 256.0,  -4.0 / 256.0, -6.0 / 256.0, -4.0 / 256.0, -1.0 / 256.0},
     };
 
-    class Kernel {
-        private:
-
-        public:
-
-            static
+    namespace Kernel {
+        inline
         cv::Mat convolve(cv::Mat in, const float kernel[][3])
         {
             cv::Size dim = in.size();
@@ -77,7 +73,7 @@ namespace Image {
 
             return out;
         }
-    };
+    }
 }
 
 #endif

Image/Skew.h

@@ -17,11 +17,7 @@
 #include "../Utils/MathUtils.h"
 
 namespace Image {
-    class Skew {
-        private:
-
-        public:
-            static
+    namespace Skew {
         cv::Mat deskewHoughLines(cv::Mat in, int maxDegree = 45)
         {
             cv::Size dim = in.size();
@@ -89,7 +85,7 @@ namespace Image {
 
             return out;
         }
-    };
+    }
 }
 
 #endif

Image/Thresholding.h

@@ -17,11 +17,7 @@
 #include "../Utils/MathUtils.h"
 
 namespace Image {
-    class Thresholding {
-        private:
-
-        public:
-            static
+    namespace Thresholding {
         cv::Mat integralThresholding(cv::Mat in)
         {
             cv::Size dim = in.size();
@@ -77,7 +73,7 @@ namespace Image {
 
             return out;
         }
-    };
+    }
 }
 
 #endif

Utils/ApplicationUtils.h

@@ -39,6 +39,7 @@ namespace Utils {
             return cwd;
         }
 
+        inline
         void chdir_application(char *cwd, char *arg)
         {
             #ifdef _WIN32
@@ -80,6 +81,7 @@ namespace Utils {
             #endif
         }
 
+        inline
         const char *compile_arg_line(int argc, char **argv)
         {
             size_t max    = 512;

Utils/FileUtils.h

@@ -10,6 +10,9 @@
 #ifndef UTILS_FILE_UTILS_H
 #define UTILS_FILE_UTILS_H
 
+#include <stdio.h>
+#include <string.h>
+
 #ifdef _WIN32
     #include <windows.h>
     #include <stdio.h>
@@ -88,6 +91,7 @@ namespace Utils {
             #endif
         }
 
+        inline
         const char* file_extension (const char *filename)
         {
             char *dot = strrchr((char *) filename, '.');
@@ -104,7 +108,6 @@ namespace Utils {
             int size;
         } file_body;
 
-        inline
         file_body read_file (const char *filename)
         {
             file_body file = {0};

Utils/WebUtils.h

@@ -19,7 +19,6 @@
 
 namespace Utils {
     namespace WebUtils {
-        static
         int write_download_data (void *ptr, size_t size, size_t nmeb, void *stream)
         {
             Utils::FileUtils::file_body *out = (Utils::FileUtils::file_body *) stream;
@@ -42,7 +41,7 @@ namespace Utils {
             return out->size;
         }
 
-        static
+        inline
         Utils::FileUtils::file_body download (char *url)
         {
             Utils::FileUtils::file_body page = {0};