add detect label convert utility

khandy/label/detect.py

@@ -486,4 +486,72 @@ class CocoDetectHandler:
             coco_record.objects.append(coco_object)
         return coco_record
         
-        
+        
+def _get_format(record):
+    if isinstance(record, LabelmeRecord):
+        return ('labelme',)
+    elif isinstance(record, YoloRecord):
+        return ('yolo',)
+    elif isinstance(record, PascalVocRecord):
+        return ('voc', 'pascal', 'pascal_voc')
+    elif isinstance(record, CocoRecord):
+        return ('coco',)
+    else:
+        return ()
+        
+    
+def load(filename, fmt, **kwargs):
+    if fmt == 'labelme':
+        record = LabelmeHandler.load(filename)
+    elif fmt == 'yolo':
+        record = YoloHandler.load(filename)
+    elif fmt in ('voc', 'pascal', 'pascal_voc'):
+        record = PascalVocHandler.load(filename)
+    elif fmt == 'coco':
+        record = CocoDetectHandler.load(filename, **kwargs)
+    else:
+        raise ValueError(f"Unsupported detect label fmt. Got {fmt}")
+    return record
+    
+    
+def save(filename, record):
+    if isinstance(record, LabelmeRecord):
+        LabelmeHandler.save(filename, record)
+    elif isinstance(record, YoloRecord):
+        YoloHandler.save(filename, record)
+    elif isinstance(record, PascalVocRecord):
+        PascalVocHandler.save(filename, record)
+    elif isinstance(record, CocoRecord):
+        raise ValueError("Unsupported for CocoRecord now!")
+    else:
+        raise ValueError("Unsupported type!")
+        
+        
+def convert(record, out_fmt):
+    allowed_fmts = ("labelme", "yolo", "voc", "coco", 'pascal', 'pascal_voc')
+    if out_fmt not in allowed_fmts:
+        raise ValueError("Unsupported label format conversions for given out_fmt")
+    if out_fmt in _get_format(record):
+        return record
+
+    if isinstance(record, LabelmeRecord):
+        ir_record = LabelmeHandler.to_ir(record)
+    elif isinstance(record, YoloRecord):
+        ir_record = YoloHandler.to_ir(record)
+    elif isinstance(record, PascalVocRecord):
+        ir_record = PascalVocHandler.to_ir(record)
+    elif isinstance(record, CocoRecord):
+        ir_record = CocoDetectHandler.to_ir(record)
+    else:
+        raise ValueError('Unsupported type for record')
+        
+    if out_fmt == 'labelme':
+        dst_record = LabelmeHandler.from_ir(ir_record)
+    elif out_fmt == 'yolo':
+        dst_record = YoloHandler.from_ir(ir_record)
+    elif out_fmt in ('voc', 'pascal', 'pascal_voc'):
+        dst_record = PascalVocHandler.from_ir(ir_record)
+    elif out_fmt == 'coco':
+        dst_record = CocoDetectHandler.from_ir(ir_record)
+    return dst_record
+