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Instance Segmentation and Tracking using Ultralytics YOLOv8 🚀

What is Instance Segmentation?

Ultralytics YOLOv8 instance segmentation involves identifying and outlining individual objects in an image, providing a detailed understanding of spatial distribution. Unlike semantic segmentation, it uniquely labels and precisely delineates each object, crucial for tasks like object detection and medical imaging.

There are two types of instance segmentation tracking available in the Ultralytics package:

  • Instance Segmentation with Class Objects: Each class object is assigned a unique color for clear visual separation.

  • Instance Segmentation with Object Tracks: Every track is represented by a distinct color, facilitating easy identification and tracking.



Watch: Instance Segmentation with Object Tracking using Ultralytics YOLOv8

Samples

Instance Segmentation Instance Segmentation + Object Tracking
Ultralytics Instance Segmentation Ultralytics Instance Segmentation with Object Tracking
Ultralytics Instance Segmentation 😍 Ultralytics Instance Segmentation with Object Tracking 🔥

Instance Segmentation and Tracking

import cv2
from ultralytics import YOLO
from ultralytics.utils.plotting import Annotator, colors

model = YOLO("yolov8n-seg.pt")  # segmentation model
names = model.model.names
cap = cv2.VideoCapture("path/to/video/file.mp4")
w, h, fps = (int(cap.get(x)) for x in (cv2.CAP_PROP_FRAME_WIDTH, cv2.CAP_PROP_FRAME_HEIGHT, cv2.CAP_PROP_FPS))

out = cv2.VideoWriter('instance-segmentation.avi', cv2.VideoWriter_fourcc(*'MJPG'), fps, (w, h))

while True:
    ret, im0 = cap.read()
    if not ret:
        print("Video frame is empty or video processing has been successfully completed.")
        break

    results = model.predict(im0)
    annotator = Annotator(im0, line_width=2)

    if results[0].masks is not None:
        clss = results[0].boxes.cls.cpu().tolist()
        masks = results[0].masks.xy
        for mask, cls in zip(masks, clss):
            annotator.seg_bbox(mask=mask,
                               mask_color=colors(int(cls), True),
                               det_label=names[int(cls)])

    out.write(im0)
    cv2.imshow("instance-segmentation", im0)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

out.release()
cap.release()
cv2.destroyAllWindows()

import cv2
from ultralytics import YOLO
from ultralytics.utils.plotting import Annotator, colors

from collections import defaultdict

track_history = defaultdict(lambda: [])

model = YOLO("yolov8n-seg.pt")   # segmentation model
cap = cv2.VideoCapture("path/to/video/file.mp4")
w, h, fps = (int(cap.get(x)) for x in (cv2.CAP_PROP_FRAME_WIDTH, cv2.CAP_PROP_FRAME_HEIGHT, cv2.CAP_PROP_FPS))

out = cv2.VideoWriter('instance-segmentation-object-tracking.avi', cv2.VideoWriter_fourcc(*'MJPG'), fps, (w, h))

while True:
    ret, im0 = cap.read()
    if not ret:
        print("Video frame is empty or video processing has been successfully completed.")
        break

    annotator = Annotator(im0, line_width=2)

    results = model.track(im0, persist=True)

    if results[0].boxes.id is not None and results[0].masks is not None:
        masks = results[0].masks.xy
        track_ids = results[0].boxes.id.int().cpu().tolist()

        for mask, track_id in zip(masks, track_ids):
            annotator.seg_bbox(mask=mask,
                               mask_color=colors(track_id, True),
                               track_label=str(track_id))

    out.write(im0)
    cv2.imshow("instance-segmentation-object-tracking", im0)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

out.release()
cap.release()
cv2.destroyAllWindows()

seg_bbox Arguments

Name Type Default Description
mask array None Segmentation mask coordinates
mask_color tuple (255, 0, 255) Mask color for every segmented box
det_label str None Label for segmented object
track_label str None Label for segmented and tracked object

Note

For any inquiries, feel free to post your questions in the Ultralytics Issue Section or the discussion section mentioned below.



Created 2023-12-18, Updated 2024-03-03
Authors: glenn-jocher (6), RizwanMunawar (2)

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