Update flask

@@ -29,8 +29,9 @@ function activate()
 function detect_face()
 {
 	let classifier = new cv.CascadeClassifier();
+	let imgElement = document.getElementById('imagefile');
 	classifier.load('haarcascade_frontalface_default.xml');
-	let src = cv.imread('imagefile');
+	let src = cv.imread(imgElement);
 	let dst = new cv.Mat(video.height, video.width, cv.CV_8UC4);
 	let gray = new cv.Mat();
 	src.copyTo(dst);