Update flask

@@ -11,7 +11,9 @@
 <script type='text/javascript' src="{{url_for('static', filename='js/utils.js')}}"></script>
 <script type='text/javascript' src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
 <script type='text/javascript'>
-let tempCanvas = document.createElement("canvas");
+var tempImage = new Image();
+var tempCanvas = document.createElement("canvas");
+
 function load_cascade()
 {
     let faceCascadeFile = 'haarcascade_frontalface_default.xml'
@@ -27,11 +29,11 @@ function activate()
 	fileloader.disabled = false;
 }
 
-function detect_face(img)
+function detect_face()
 {
 	let canvas = document.createElement('canvas');
 	let ctx = canvas.getContext('2d')
-	ctx.src = img;	
+	ctx.drawImage(tempImage, 0, 0);
 	let src = cv.imread(canvas);
 	let dst = new cv.Mat(src.cols, src.rows, cv.CV_8UC4);
 	let gray = new cv.Mat();
@@ -98,8 +100,8 @@ var loadFile = function(event) {
     var reader = new FileReader();
     reader.readAsDataURL(event.target.files[0]);
     reader.onload = function() {
-		let img = reader.result;
-		detect_face(img);
+		tempImage.src = reader.result;
+		detect_face();
     };
   };
 </script>