diff --git a/tsmark/__init__.py b/tsmark/__init__.py
index 9565bb3..b157a89 100644
--- a/tsmark/__init__.py
+++ b/tsmark/__init__.py
@@ -2,7 +2,7 @@ import argparse
 
 from tsmark.video_annotator import Marker
 
-VERSION = "0.7.14"
+VERSION = "0.7.15"
 
 
 class SmartFormatter(argparse.HelpFormatter):
diff --git a/tsmark/video_annotator.py b/tsmark/video_annotator.py
index 3c618bc..baa9589 100755
--- a/tsmark/video_annotator.py
+++ b/tsmark/video_annotator.py
@@ -849,7 +849,25 @@ class World:
                 return {"x0": x0, "y0": y0, "x1": x1, "y1": y1, "type": t, "visible": visible, "age": age}
 
             def point2array(p):
-                return [p["x0"], p["y0"], p["x1"], p["y1"]]
+                """cx, cy, w, h"""
+                return [
+                    (p["x0"] + p["x1"]) / 2,
+                    (p["y0"] + p["y1"]) / 2,
+                    abs(p["x0"] - p["x1"]),
+                    abs(p["y0"] - p["y1"]),
+                ]
+
+            def array2point(a, visibility):
+                w2 = max(1, a[3] / 2)
+                h2 = max(1, a[4] / 2)
+                return {
+                    "x0": int(a[1] - w2),
+                    "y0": int(a[2] - h2),
+                    "x1": int(a[1] + w2),
+                    "y1": int(a[2] + h2),
+                    "type": "interp",
+                    "visible": visible,
+                }
 
             if point_index in self.points_interpolation_required:
                 seed_keys = (
@@ -904,8 +922,8 @@ class World:
                 else:
                     point_keys = global_point_keys
 
-                xyxy = np.array([point2array(self.points[point_index][k]) for k in point_keys]).T
-                spline = PchipInterpolator(point_keys, xyxy, axis=1)
+                xywh = np.array([point2array(self.points[point_index][k]) for k in point_keys]).T
+                spline = PchipInterpolator(point_keys, xywh, axis=1)
                 start_key = min(global_point_keys)
                 end_key = max(global_point_keys) + 1
 
@@ -919,14 +937,7 @@ class World:
                 for row in np.vstack((t2, spline(t2))).T:
                     if row[0] in point_keys:
                         visible = self.points[point_index][row[0]]["visible"]
-                    new_points[row[0]] = {
-                        "type": "interp",
-                        "x0": int(row[1]),
-                        "y0": int(row[2]),
-                        "x1": int(row[3]),
-                        "y1": int(row[4]),
-                        "visible": visible,
-                    }
+                    new_points[row[0]] = array2point(row, visible)
 
                 # post points
                 global_last = self.points[point_index][max(global_point_keys)]
@@ -1296,7 +1307,10 @@ class World:
                     ffmpeg_args_print.append(
                         arg.format(
                             input=shlex.quote(src_name_print),
-                            output=shlex.quote(f"{tgt_name_print}.trim.{from_str}-{to_str}"),
+                            output=shlex.quote(
+                                f"{tgt_name_print}.trim.{
+                                               from_str}-{to_str}"
+                            ),
                             start_time=from_ft,
                             end_time=to_ft,
                         )
@@ -1304,7 +1318,8 @@ class World:
                     ffmpeg_args.append(
                         arg.format(
                             input=self.opts.video,
-                            output=f"{os.path.splitext(self.opts.video)[0]}.trim.{from_str}-{to_str}",
+                            output=f"{os.path.splitext(self.opts.video)[0]}.trim.{
+                                from_str}-{to_str}",
                             start_time=from_ft,
                             end_time=to_ft,
                         )
@@ -1517,14 +1532,18 @@ class World:
 
                 elif k & 0xFF == ord("f"):  # modify FPS
                     FPS_modifier = (FPS_modifier + 1) % len(FPS_modifiers)
-                    self.add_message(f"Player speed {round(1/FPS_modifiers[FPS_modifier],2)}")
+                    self.add_message(
+                        f"Player speed {round(
+                        1/FPS_modifiers[FPS_modifier], 2)}"
+                    )
                 elif k & 0xFF == ord("a"):  # toggle crop offset
                     self.crop_click = 0 if self.crop_click == 1 else 1
                     self.crop[2] = True
                 elif k & 0xFF == ord("s"):  # toggle crop size
                     self.crop_click = 0 if self.crop_click == 2 else 2
                     self.crop[2] = True
-                elif k & 0xFF == ord("o"):  # toggle point visibility (yes/occlusion/hidden)
+                # toggle point visibility (yes/occlusion/hidden)
+                elif k & 0xFF == ord("o"):
                     if self.opts.output_points is not None:
                         self.toggle_point_visibility()
                 elif k & 0xFF == ord("p"):  # toggle points
@@ -1737,7 +1756,8 @@ class TrackerGUI:
                 show_message = f"Tracking... ({i+1}/{max_frames})"
             else:
                 # Tracking failure
-                show_message = f"Tracking failure detected ({i+1}/{max_frames})"
+                show_message = f"Tracking failure detected ({
+                    i+1}/{max_frames})"
                 bbox = None
 
             if time.time() > show_time + visu_interval: