allow for screen size related resizing

apps/annotation/opencv_annotation.cpp

@@ -229,6 +229,8 @@ int main( int argc, const char** argv )
         "{ help h usage ? |      | show this message }"
         "{ images i       |      | (required) path to image folder [example - /data/testimages/] }"
         "{ annotations a  |      | (required) path to annotations txt file [example - /data/annotations.txt] }"
+        "{ maxWindowHeight m  |  -1   | (optional) images larger in height than this value will be scaled down }"
+        "{ resizeFactor r  |  2  | (optional) factor for scaling down [default = half the size] }"
     );
     // Read in the input arguments
     if (parser.has("help")){
@@ -244,6 +246,9 @@ int main( int argc, const char** argv )
         return -1;
     }
 
+    int resizeFactor = parser.get<int>("resizeFactor");
+    int const maxWindowHeight = parser.get<int>("maxWindowHeight") > 0 ? parser.get<int>("maxWindowHeight") : -1;
+
     // Check if the folder actually exists
     // If -1 is returned then the folder actually exists, and thus you can continue
     // In all other cases there was a folder creation and thus the folder did not exist
@@ -278,6 +283,7 @@ int main( int argc, const char** argv )
     for (size_t i = 0; i < filenames.size(); i++){
         // Read in an image
         Mat current_image = imread(filenames[i]);
+        bool const resize_bool = (maxWindowHeight > 0) && (current_image.rows > maxWindowHeight);
 
         // Check if the image is actually read - avoid other files in the folder, because glob() takes them all
         // If not then simply skip this iteration
@@ -285,8 +291,21 @@ int main( int argc, const char** argv )
             continue;
         }
 
+        if(resize_bool){
+            resize(current_image, current_image, Size(current_image.cols/resizeFactor, current_image.rows/resizeFactor));
+        }
+
         // Perform annotations & store the result inside the vectorized structure
+        // If the image was resized before, then resize the found annotations back to original dimensions
         vector<Rect> current_annotations = get_annotations(current_image);
+        if(resize_bool){
+            for(int j =0; j < (int)current_annotations.size(); j++){
+                current_annotations[j].x = current_annotations[j].x * resizeFactor;
+                current_annotations[j].y = current_annotations[j].y * resizeFactor;
+                current_annotations[j].width = current_annotations[j].width * resizeFactor;
+                current_annotations[j].height = current_annotations[j].height * resizeFactor;
+            }
+        }
         annotations.push_back(current_annotations);
 
         // Check if the ESC key was hit, then exit earlier then expected