Added --rmtrunc, made --rmdiff mark a box as ignored rather than

totally removing it, and also made --stats print the number of non-ignored
boxes.

tools/imglab/src/main.cpp

@@ -171,6 +171,7 @@ void print_all_label_stats (
     std::map<std::string, running_stats<double> > area_stats, aspect_ratio;
     std::map<std::string, int> image_hits;
     std::set<std::string> labels;
+    unsigned long num_unignored_boxes = 0;
     for (unsigned long i = 0; i < data.images.size(); ++i)
     {
         std::set<std::string> temp;
@@ -182,6 +183,9 @@ void print_all_label_stats (
             area_stats[data.images[i].boxes[j].label].add(data.images[i].boxes[j].rect.area());
             aspect_ratio[data.images[i].boxes[j].label].add(data.images[i].boxes[j].rect.width()/
                                                     (double)data.images[i].boxes[j].rect.height());
+
+            if (!data.images[i].boxes[j].ignore)
+                ++num_unignored_boxes;
         }
 
         // count the number of images for each label
@@ -190,7 +194,8 @@ void print_all_label_stats (
     }
 
     cout << "Number of images: "<< data.images.size() << endl;
-    cout << "Number of different labels: "<< labels.size() << endl << endl;
+    cout << "Number of different labels: "<< labels.size() << endl;
+    cout << "Number of non-ignored boxes: " << num_unignored_boxes << endl << endl;
 
     for (std::set<std::string>::iterator i = labels.begin(); i != labels.end(); ++i)
     {
@@ -463,7 +468,8 @@ int main(int argc, char** argv)
         parser.add_option("rename", "Rename all labels of <arg1> to <arg2>.",2);
         parser.add_option("parts","The display will allow image parts to be labeled.  The set of allowable parts "
                           "is defined by <arg> which should be a space separated list of parts.",1);
-        parser.add_option("rmdiff","Remove boxes marked as difficult.");
+        parser.add_option("rmdiff","Set the ignored flag to true for boxes marked as difficult.");
+        parser.add_option("rmtrunc","Set the ignored flag to true for boxes that are partially outside the image.");
         parser.add_option("shuffle","Randomly shuffle the order of the images listed in file <arg>.");
         parser.add_option("seed", "When using --shuffle, set the random seed to the string <arg>.",1);
         parser.add_option("split", "Split the contents of an XML file into two separate files.  One containing the "
@@ -483,7 +489,7 @@ int main(int argc, char** argv)
 
         parser.parse(argc, argv);
 
-        const char* singles[] = {"h","c","r","l","convert","parts","rmdiff","seed", "shuffle", "split", "add", 
+        const char* singles[] = {"h","c","r","l","convert","parts","rmdiff", "rmtrunc","seed", "shuffle", "split", "add", 
                                  "flip", "rotate", "tile", "size", "cluster"};
         parser.check_one_time_options(singles);
         const char* c_sub_ops[] = {"r", "convert"};
@@ -493,6 +499,7 @@ int main(int argc, char** argv)
         parser.check_sub_options(size_parent_ops, "size");
         parser.check_incompatible_options("c", "l");
         parser.check_incompatible_options("c", "rmdiff");
+        parser.check_incompatible_options("c", "rmtrunc");
         parser.check_incompatible_options("c", "add");
         parser.check_incompatible_options("c", "flip");
         parser.check_incompatible_options("c", "rotate");
@@ -520,6 +527,7 @@ int main(int argc, char** argv)
         parser.check_incompatible_options("convert", "parts");
         parser.check_incompatible_options("convert", "cluster");
         parser.check_incompatible_options("rmdiff", "rename");
+        parser.check_incompatible_options("rmtrunc", "rename");
         const char* convert_args[] = {"pascal-xml","pascal-v1","idl"};
         parser.check_option_arg_range("convert", convert_args);
         parser.check_option_arg_range("cluster", 2, 999);
@@ -601,13 +609,39 @@ int main(int argc, char** argv)
             load_image_dataset_metadata(data, parser[0]);
             for (unsigned long i = 0; i < data.images.size(); ++i)
             {
-                std::vector<dlib::image_dataset_metadata::box> boxes;
                 for (unsigned long j = 0; j < data.images[i].boxes.size(); ++j)
                 {
-                    if (!data.images[i].boxes[j].difficult)
-                        boxes.push_back(data.images[i].boxes[j]);
+                    if (data.images[i].boxes[j].difficult)
+                        data.images[i].boxes[j].ignore = true;
+                }
+            }
+            save_image_dataset_metadata(data, parser[0]);
+            return EXIT_SUCCESS;
+        }
+
+        if (parser.option("rmtrunc"))
+        {
+            if (parser.number_of_arguments() != 1)
+            {
+                cerr << "The --rmtrunc option requires you to give one XML file on the command line." << endl;
+                return EXIT_FAILURE;
+            }
+
+            dlib::image_dataset_metadata::dataset data;
+            load_image_dataset_metadata(data, parser[0]);
+            {
+                locally_change_current_dir chdir(get_parent_directory(file(parser[0])));
+                for (unsigned long i = 0; i < data.images.size(); ++i)
+                {
+                    array2d<unsigned char> img;
+                    load_image(img, data.images[i].filename);
+                    const rectangle area = get_rect(img);
+                    for (unsigned long j = 0; j < data.images[i].boxes.size(); ++j)
+                    {
+                        if (!area.contains(data.images[i].boxes[j].rect))
+                            data.images[i].boxes[j].ignore = true;
+                    }
                 }
-                data.images[i].boxes = boxes;
             }
             save_image_dataset_metadata(data, parser[0]);
             return EXIT_SUCCESS;