Update app.py

app.py

@@ -8,6 +8,7 @@ def detect_faces(image):
     gray_image = cv2.cvtColor(image_np, cv2.COLOR_RGB2GRAY)
     face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")
     faces = face_cascade.detectMultiScale(gray_image, scaleFactor=1.1, minNeighbors=5, minSize=(10, 10))
+    print("faces: "+faces)
     for (x, y, w, h) in faces:
         cv2.rectangle(image_np, (x, y), (x+w, y+h), (0, 255, 0), 2)
     return image_np