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Merge pull request #1919 from Ashp116/feature/spline-tracer 

FEATURE: Spline Annotations
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Piotr Skalski 2025-07-31 16:53:33 +02:00 committed by GitHub
parent dda3900943 0c9fea4d9f
commit 90f8582e4f
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1 changed files with 13 additions and 1 deletions
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14
supervision/annotators/core.py
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@ -7,6 +7,7 @@ import cv2
import numpy as np
import numpy.typing as npt
from PIL import Image, ImageDraw, ImageFont
from scipy.interpolate import splev, splprep
from supervision.annotators.base import BaseAnnotator, ImageType
from supervision.annotators.utils import (
@ -1820,6 +1821,7 @@ class TraceAnnotator(BaseAnnotator):
position: Position = Position.CENTER,
trace_length: int = 30,
thickness: int = 2,
smooth: bool = False,
color_lookup: ColorLookup = ColorLookup.CLASS,
):
"""
@ -1831,12 +1833,14 @@ class TraceAnnotator(BaseAnnotator):
trace_length (int): The maximum length of the trace in terms of historical
points. Defaults to `30`.
thickness (int): The thickness of the trace lines. Defaults to `2`.
smooth (bool): Smooth the trace lines.
color_lookup (ColorLookup): Strategy for mapping colors to annotations.
Options are `INDEX`, `CLASS`, `TRACK`.
"""
self.color: Color | ColorPalette = color
self.trace = Trace(max_size=trace_length, anchor=position)
self.thickness = thickness
self.smooth = smooth
self.color_lookup: ColorLookup = color_lookup
@ensure_cv2_image_for_annotation
@ -1908,10 +1912,18 @@ class TraceAnnotator(BaseAnnotator):
else custom_color_lookup,
)
xy = self.trace.get(tracker_id=tracker_id)
spline_points = xy.astype(np.int32)
if len(xy) > 3 and self.smooth:
x, y = xy[:, 0], xy[:, 1]
tck, u = splprep([x, y], s=20)
x_new, y_new = splev(np.linspace(0, 1, 100), tck)
spline_points = np.stack([x_new, y_new], axis=1).astype(np.int32)
if len(xy) > 1:
scene = cv2.polylines(
scene,
[xy.astype(np.int32)],
[spline_points],
False,
color=color.as_bgr(),
thickness=self.thickness,