Added an ignore option to the image dataset metadata file format.

dlib/data_io/image_dataset_metadata.cpp

@@ -76,6 +76,8 @@ namespace dlib
                         fout << " truncated='" << b.truncated << "'";
                     if (b.occluded)
                         fout << " occluded='" << b.occluded << "'";
+                    if (b.ignore)
+                        fout << " ignore='" << b.ignore << "'";
 
                     if (b.has_label() || b.parts.size() != 0)
                     {
@@ -186,6 +188,7 @@ namespace dlib
                         if (atts.is_in_list("difficult")) temp_box.difficult = sa = atts["difficult"];
                         if (atts.is_in_list("truncated")) temp_box.truncated = sa = atts["truncated"];
                         if (atts.is_in_list("occluded"))  temp_box.occluded  = sa = atts["occluded"];
+                        if (atts.is_in_list("ignore"))  temp_box.ignore  = sa = atts["ignore"];
 
                         temp_box.rect.bottom() += temp_box.rect.top()-1;
                         temp_box.rect.right() += temp_box.rect.left()-1;

dlib/data_io/image_dataset_metadata.h

@@ -31,7 +31,8 @@ namespace dlib
             ) : 
                 difficult(false),
                 truncated(false),
-                occluded(false)
+                occluded(false),
+                ignore(false)
             {}
 
             rectangle rect;
@@ -43,6 +44,7 @@ namespace dlib
             bool difficult;
             bool truncated;
             bool occluded;
+            bool ignore;
 
             bool has_label() const { return label.size() != 0; }
             /*!