added default image and update app

app.py

@@ -22,7 +22,7 @@ st.write('High pass filter applied to images. ')
 left, right = st.columns([3, 2])
 
 # Uploader
-img_or_video = left.file_uploader("Upload an image or video: ", type=['.jpg', '.png', '.jpeg'])
+img_or_video = left.file_uploader("Upload an image: ", type=['.jpg', '.png', '.jpeg'])
 
 # Display example selection
 size = int(right.number_input('Filter size (ex: 3x3): ', min_value=3, max_value=500, value=3, help='Filter size. '))
@@ -31,26 +31,25 @@ size = int(right.number_input('Filter size (ex: 3x3): ', min_value=3, max_value=
 filter_text = right.empty()
 size_text = right.empty()
 
-# When a file is uploaded
-if img_or_video:
-    original = Image.open(img_or_video)
-    image = np.array(original)
-    gray = np.array(original.convert('L'))
+# Default image or uploaded one
+original = Image.open("resource/example.jpg" if img_or_video is None else img_or_video)
+image = np.array(original)
+gray = np.array(original.convert('L'))
 
-    # Apply high pass
-    lowpass = ndimage.gaussian_filter(gray, size)
-    gauss_highpass = gray - lowpass
+# Apply high pass
+lowpass = ndimage.gaussian_filter(gray, size)
+gauss_highpass = gray - lowpass
 
-    # Display original
-    st.image(1-gauss_highpass, caption='High Pass')
+# Display original
+st.image(1-gauss_highpass, caption='High Pass')
 
-    # Update elements
-    filter_text.write(f'Using filter of size {size}x{size}. ')
-    size_text.write(f'Image size: {gauss_highpass.shape}')
+# Update elements
+filter_text.write(f'Using filter of size {size}x{size}. ')
+size_text.write(f'Image size: {gauss_highpass.shape}')
 
-    # Split UI in 2
-    left2, right2 = st.columns([5, 5])
+# Split UI in 2
+left2, right2 = st.columns([5, 5])
 
-    # Display img
-    left2.image(image, caption='Original')
-    right2.image(lowpass, caption='Low Pass')
+# Display img
+left2.image(image, caption='Original')
+right2.image(lowpass, caption='Low Pass')