Update app.py

app.py

@@ -78,7 +78,7 @@ def warpImage(im, vx, vy, cast_uint8=True):
     xx, yy = np.meshgrid(x, y)
     XX, YY = np.meshgrid(X, Y)
     #XX = XX + vx
-    XX = np.concatenate([XX, vx], axis = 0)
+    XX = np.concatenate([XX, vx], axis = 1)
     #YY = YY + vy
     YY = np.concatenate([YY, vy], axis = 0)
     mask = (XX < 1) | (XX > width2) | (YY < 1) | (YY > height2)