fix btn

app.py

@@ -104,7 +104,7 @@ def find_largest_face(faces):
     return largest_face
 
 
-def inference(img):
+def inference(img, btn_res):
     grey = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
     faces = faceClassifier.detectMultiScale(
         grey, scaleFactor=1.1, minNeighbors=4)