Update app.py

app.py

@@ -43,8 +43,9 @@ def fourier_transform_drawing(input_image, frames, coefficients):
     scale_factor_y = desired_range / y_range
     
     # apply scaling
+    # ys needs to be flipped vertically
     xs = (xs - np.mean(xs)) * scale_factor_x
-    ys = (ys - np.mean(ys)) * scale_factor_y
+    ys = (-ys + np.mean(ys)) * scale_factor_y
 
     t_list = np.linspace(0, tau, len(xs))
 
@@ -112,8 +113,8 @@ interface = gr.Interface(
     fn=fourier_transform_drawing,
     inputs=[
         gr.Image(label="Input Image", sources=['upload'], type="pil"),
-        gr.Slider(minimum=10, maximum=500, value=100, label="Number of Frames"),
-        gr.Slider(minimum=10, maximum=500, value=100, label="Number of Coefficients")
+        gr.Slider(minimum=5, maximum=500, value=50, label="Number of Frames"),
+        gr.Slider(minimum=1, maximum=500, value=50, label="Number of Coefficients")
     ],
     outputs=gr.Video(),
     title="Fourier Transform Drawing",