Update app.py

app.py

@@ -40,7 +40,7 @@ def simple_edge_detector(file, order, direction):
     return K.utils.tensor_to_image(img_out)
 
 
-def laplacian_edge_detector(file, kernel):
+def laplacian_edge_detector(file, kernel=9):
     x_gray = load_img(file)
     x_laplacian: Tensor = K.filters.laplacian(x_gray, kernel_size=kernel)
     img_out = 1.0 - x_laplacian.clamp(0.0, 1.0)