Visualize events v1 (#210)

src/evlib/vis/view2d.py

@@ -75,3 +75,28 @@ def optical_flow(
  else:
  wheel = None
  return image, wheel
+
+
+def events(events: np.ndarray, image_shape: tuple) -> Image.Image:
+ """Visualize events with polarity color.
+
+ Args:
+ events (np.ndarray): _description_
+ image_shape (tuple): _description_
+
+ Returns:
+ _type_: _description_
+ """
+ background_color = 255
+ image = (
+ np.ones((image_shape[0], image_shape[1], 3), dtype=np.uint8)
+ * background_color
+ ) # RGBA channel
+
+ events[:, 0] = np.clip(events[:, 0], 0, image_shape[0] - 1)
+ events[:, 1] = np.clip(events[:, 1], 0, image_shape[1] - 1)
+ colors = np.array([(255, 0, 0) if e[3] == 1 else (0, 0, 255) for e in events])
+ image[events[:, 0].astype(np.int32), events[:, 1].astype(np.int32), :] = colors
+
+ image = Image.fromarray(image)
+ return image