안면 인식 Service 클래스 추가

back-end2/src/services/face_detection_service.py

+from retinaface import RetinaFace
+from utils.image.image_converter import ImageConverter
+
+class FaceDetectionService:
+    # https://github.com/serengil/retinaface
+    def detect_faces(self, image_bytes, normalized = True):
+        image = ImageConverter().convert_to_np_image(image_bytes)
+        
+        data = RetinaFace.detect_faces(image)
+        
+        if normalized is False: # [left, top, right, bottom]
+            faceDataList = {face: 
+                            {'facial_area': 
+                             {"left": int(info['facial_area'][0]),
+                              "top": int(info['facial_area'][1]),
+                              "right": int(info['facial_area'][2]),
+                              "bottom": int(info['facial_area'][3])}}
+                              for face, info in data.items()}
+        else:
+            img_width = image.shape[1]
+            img_height = image.shape[0]
+            faceDataList = {face: {'facial_area': {
+                "left": int(info['facial_area'][0]) / img_width,
+                "top": int(info['facial_area'][1]) / img_height,
+                "right": int(info['facial_area'][2]) / img_width,
+                "bottom": int(info['facial_area'][3]) / img_height}} 
+                for face, info in data.items()}
+            
+        return faceDataList
\ No newline at end of file