Update flask

@@ -36,7 +36,7 @@ function detect_face(img)
 	ctx.src = img;
 	
 	let src = cv.imread(canvas);
-	let dst = new cv.Mat(video.height, video.width, cv.CV_8UC4);
+	let dst = new cv.Mat(src.cols, src.rows, cv.CV_8UC4);
 	let gray = new cv.Mat();
 	src.copyTo(dst);
 	cv.cvtColor(dst, gray, cv.COLOR_RGBA2GRAY, 0);