参考：
参考：
https://github.com/ultralytics/ultralytics
https://github.com/TommyZihao/Train_Custom_Dataset/blob/main/%E7%9B%AE%E6%A0%87%E8%BF%BD%E8%B8%AA/%E5%85%AC%E5%BC%80%E8%AF%BE/

https://www.rstk.cn/news/42041.html?action=onClick

*** 跟踪与检测都是用的YOLOv8目标检测一样的权重

1、命令行运行

视频下载：

人流量视频：
https://zihao-openmmlab.obs.cn-east-3.myhuaweicloud.com/20220418-mmtracking/data/mot_people_short.mp4
车流量视频：
https://zihao-openmmlab.obs.cn-east-3.myhuaweicloud.com/20230502-YOLO/videos/bridge-short.mp4

可能出现报错OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.

解决方法参考：https://blog.csdn.net/qq_37164776/article/details/126832303
需要去env环境里把其中一个删除再运行

##检测
yolo detect predict model=C:\Users\lonng\Downloads\yolov8s.pt source=bus.jpg ##图片

yolo detect predict model=C:\Users\lonng\Downloads\yolov8s.pt source=C:\Users\lonng\Desktop\rdkit_learn\opencv2\videos\bridge-short.mp4  show=True save=True   ##视频


##调摄像头
yolo detect predict model=C:\Users\lonng\Downloads\yolov8s.pt source=0  show=True

注意：跟踪命令行没有predict，只有track

##跟踪，文件路径不需要加引号
yolo track model=C:\Users\lonng\Downloads\yolov8s.pt  source=C:\Users\lonng\Desktop\rdkit_learn\opencv2\videos\mot_people_short.mp4 show=True save=True


yolo track  model=C:\Users\lonng\Downloads\yolov8s.pt source=0  show=True ##摄像头

运行解释会保存到runs目录下

2、python代码运行

跟踪完整代码：

import time
from tqdm import tqdm

import cv2
import numpy as np

from ultralytics import YOLO

import supervision as sv



model = YOLO(r'C:\Users\lonng\Downloads\yolov8s.pt')

VIDEO_PATH = 'videos/bridge-short.mp4'

##指定统计区域
polygons = [
    np.array([[600, 680], [927, 680], [851, 950], [42, 950]]),
    np.array([[987, 680], [1350, 680], [1893, 950], [1015, 950]])
]

zones = [sv.PolygonZone(polygon=polygon, frame_resolution_wh=video_info.resolution_wh) for polygon in polygons]
# 配色方案
colors = sv.ColorPalette.default()
# 区域可视化，每个区域配一个 PolygonZoneAnnotator
zone_annotators = [
    sv.PolygonZoneAnnotator(zone=zone, color=colors.by_idx(index), thickness=6, text_thickness=12, text_scale=4)
    for index, zone in enumerate(zones)
]
# 目标检测可视化，每个区域配一个 BoxAnnotator
box_annotators = [
    sv.BoxAnnotator(color=colors.by_idx(index), thickness=2, text_thickness=4, text_scale=2)
    for index in range(len(polygons))
]


##每帧处理
def process_frame(frame: np.ndarray, i) -> np.ndarray:
    
    '''
    输入 bgr 的 numpy array
    输出 bgr 的 numpy array
    '''
    
    # YOLOV8 推理预测
    results = model(frame, imgsz=1280, verbose=False, show=False, device='cuda:0')[0]

    # 用 supervision 解析预测结果
    detections = sv.Detections.from_yolov8(results)
    
    # 遍历每个区域对应的所有 Annotator
    for zone, zone_annotator, box_annotator in zip(zones, zone_annotators, box_annotators):

        # 判断目标是否在区域内
        mask = zone.trigger(detections=detections)

        # 筛选出在区域内的目标
        detections_filtered = detections[mask]

        # 画框
        frame = box_annotator.annotate(scene=frame, detections=detections_filtered, skip_label=True)

        # 画区域，并写区域内目标个数
        frame = zone_annotator.annotate(scene=frame)
        
    # 更新进度条
    pbar.update(1)

    return frame

## 视频每帧预测
filehead = VIDEO_PATH.split('/')[-1]
OUT_PATH = "out-" + filehead

with tqdm(total=video_info.total_frames-1) as pbar:
    sv.process_video(source_path=VIDEO_PATH, target_path=OUT_PATH, callback=process_frame)