From 57361f05095d078076ec1fe4329afd4da5d6342f Mon Sep 17 00:00:00 2001
From: Martin Baeuml <baeuml@kit.edu>
Date: Thu, 9 Dec 2010 11:25:12 +0100
Subject: [PATCH] add rudimentary annotation container that can handle rect
 label files

---
 annotations.py | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 annotations.py

diff --git a/annotations.py b/annotations.py
new file mode 100644
index 0000000..d9bc1fb
--- /dev/null
+++ b/annotations.py
@@ -0,0 +1,81 @@
+class AnnotationContainer:
+    def __init__(self):
+        self.clear()
+
+    def filename(self):
+        return self.filename_
+
+    def clear(self):
+        self.annotations_ = []
+        self.filename_    = None
+
+    def load(self, filename):
+        self.loadRectFormat(filename)
+
+    def loadRectFormat(self, filename):
+        self.annotations_ = []
+        self.filename_ = filename
+        filename_helper = {}
+
+        try:
+            f = open(filename)
+            for line in f:
+                s = line.split()
+                image_fname = s[0]
+                num_rects = int(s[1])
+                if image_fname in filename_helper:
+                    rects = filename_helper[image_fname]['annotations']
+                else:
+                    rects = []
+
+                for i in range(0, 4*num_rects, 4):
+                    rects.append({
+                        'type': 'rect',
+                        'x': s[i+2],
+                        'y': s[i+3],
+                        'width':  s[i+4],
+                        'height': s[i+5]
+                        })
+
+                if image_fname not in filename_helper:
+                    annotation = {
+                            'type':     'image',
+                            'filename': image_fname,
+                            'annotations': rects
+                            }
+                    self.annotations_.append(annotation)
+                    filename_helper[image_fname] = annotation
+        except Exception as e:
+            self.annotations = []
+            raise e
+
+
+    def saveRectFormat(self, filename):
+        f = open(filname, "w")
+
+        for file in self.annotations_:
+            if file['type'] == 'image':
+                rect_anns = [ann for ann in file['annotations'] if ann['type'] == 'rect']
+                f.write("%s %d", file['filename'], len(rect_anns))
+                for ann in rect_anns:
+                    f.write(' %s %s %s %s', str(ann['x']), str(ann['y']), str(ann['width']), str(ann['height']))
+                f.write('\n')
+
+    def asDict(self):
+        return self.annotations_
+
+    def numFiles(self):
+        return len(self.annotations_)
+
+    def numAnnotations(self):
+        if self.annotations_ is None:
+            return 0
+        num = 0
+        for file in self.annotations_:
+            if file['type'] == 'image':
+                num += len(file['annotations'])
+            elif file['type'] == video:
+                for frame in file['frames']:
+                    num += len(frame['annotations'])
+        return num
+