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本篇在将图像输入hrnet识别之前先进行目标检测来确定识别的位置，让识别更加精准。

本段代码设置了一个区域框BOX，让人走入区域内才开始检测，适用于考核等场景，也可以直接去掉BOX也是一样的效果。若画面背景中有多个行人，还是只取要检测的那个人，同理还是适用考核场景。
为了让检测效果更直观，在一些点位直接使用线连接起来模拟人体骨骼。

import os
import sys
import numpy as np
from mmpose.apis import init_model, inference_topdown
import cv2import torch
sys.path.append("/home/yons/train/code/yolov5")
from models.experimental import attempt_load
from utils.general import non_max_suppression, scale_boxes
from torchvision import transforms# 配置文件路径和检查点文件路径
config_file = '/home/.../pose_td-hm_hrnet-w48_8xb32-210e_PullUp-det/pose_td-hm_hrnet-w48_8xb32-210e_PullUp-det.py'
checkpoint_file = '/home/.../pose_td-hm_hrnet-w48_8xb32-210e_PullUp-det/best_coco_AP_epoch_250.pth'# 初始化姿态估计模型
pose_model = init_model(config_file, checkpoint_file, device='cuda:0')
yolo_model = attempt_load('yolov5x6.pt', device='cuda:0')  # 加载训练好的yolov5模型
pose_model.eval()
yolo_model.eval()VIDEO_PATH = 'input.mp4' 
BOX = (300, 50, 300, 450)  # 区域框的左上角坐标和宽高
OUTPUT_VIDEO_PATH = 'output.mp4'def draw_keypoints(frame, keypoints, box, det_box):# 在帧上绘制关键点# 这里假设关键点是一个 Nx2 的数组，其中 N 是关键点的数量# 并且关键点的坐标是相对于裁剪区域的x, y, w, h = boxfor kp in keypoints:kp_x, kp_y = kpx_rec1 = int(det_box[0] + x)y_rec1 = int(det_box[1] + y)x_rec2 = int(det_box[2] + x)y_rec2 = int(det_box[3] + y)cv2.rectangle(frame, (x_rec1, y_rec1), (x_rec2, y_rec2), (0, 0, 255), 2)x_cir = int(kp_x + det_box[0] + x)y_cir = int(kp_y + det_box[1] + y)cv2.circle(frame, (x_cir, y_cir), 3, (0, 255, 0), -1)lines = [(15, 13), (13, 11), (16, 14), (14, 12), (11, 12), (5, 11), (6, 12), (5, 6),(5, 7), (6, 8), (7, 9), (8, 10), (1, 2), (0, 1), (0, 2), (1, 3), (2, 4), (3, 5), (4, 6)]for line in lines:pt1 = (int(keypoints[line[0]][0] + det_box[0] + x), int(keypoints[line[0]][1] + det_box[1] + y))pt2 = (int(keypoints[line[1]][0] + det_box[0] + x), int(keypoints[line[1]][1] + det_box[1] + y))cv2.line(frame, pt1, pt2, (0, 255, 0), 2)def letterbox(im, new_shape=(640, 640), color=(114, 114, 114), auto=True, scaleFill=False, scaleup=True, stride=32):"""Resizes and pads image to new_shape with stride-multiple constraints, returns resized image, ratio, padding."""shape = im.shape[:2]  # current shape [height, width]if isinstance(new_shape, int):new_shape = (new_shape, new_shape)# Scale ratio (new / old)r = min(new_shape[0] / shape[0], new_shape[1] / shape[1])if not scaleup:  # only scale down, do not scale up (for better val mAP)r = min(r, 1.0)# Compute paddingratio = r, r  # width, height ratiosnew_unpad = int(round(shape[1] * r)), int(round(shape[0] * r))dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1]  # wh paddingif auto:  # minimum rectangledw, dh = np.mod(dw, stride), np.mod(dh, stride)  # wh paddingelif scaleFill:  # stretchdw, dh = 0.0, 0.0new_unpad = (new_shape[1], new_shape[0])ratio = new_shape[1] / shape[1], new_shape[0] / shape[0]  # width, height ratiosdw /= 2  # divide padding into 2 sidesdh /= 2if shape[::-1] != new_unpad:  # resizeim = cv2.resize(im, new_unpad, interpolation=cv2.INTER_LINEAR)print(im.shape)top, bottom = int(round(dh - 0.1)), int(round(dh + 0.1))left, right = int(round(dw - 0.1)), int(round(dw + 0.1))im = cv2.copyMakeBorder(im, top, bottom, left, right, cv2.BORDER_CONSTANT, value=color)  # add borderreturn im, ratio, (dw, dh)# 处理每一张图像
k = 0
if __name__ == '__main__':# 打开视频cap = cv2.VideoCapture(VIDEO_PATH)# 获取视频的一些属性fps = cap.get(cv2.CAP_PROP_FPS)width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))# 创建 VideoWriter 对象fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # 或者使用 'XVID'out = cv2.VideoWriter(OUTPUT_VIDEO_PATH, fourcc, fps, (width, height))while True:# 读取一帧ret, frame = cap.read()if not ret:break# 加载帧x, y, w, h = BOXimg0 = frame[y:y+h, x:x+w, :]img_size = (1280, 1280)stride = max(int(yolo_model.stride.max()), 32)img = letterbox(img0, img_size, stride=stride, auto=True)[0]   # padded resizeimg = img.transpose((2, 0, 1))[::-1]  # HWC to CHW, BGR to RGBimg = np.ascontiguousarray(img)  # contiguous# yolo_model.warmup(imgsz=(1, 3, *img_size))  # warmupimg = torch.from_numpy(img).to('cuda:0')# img = img.half() if yolo_model.fp16 else img.float()  # uint8 to fp16/32img = img.float()img /= 255  # 0 - 255 to 0.0 - 1.0if len(img.shape) == 3:img = img[None]  # expand for batch dimwith torch.no_grad():pred = yolo_model(img)  # Inferencepred = non_max_suppression(pred, 0.25, 0.45, 0)  # NMS    0 for person# input()det_box = None# Process predictions# print(pred)for i, det in enumerate(pred):  # per image# print(det)if len(det):# Rescale boxes from img_size to img0 sizedet[:, :4] = scale_boxes(img.shape[2:], det[:, :4], img0.shape).round()max_bb = Nonefor x1, y1, x2, y2, conf, cls in reversed(det):if max_bb is None:max_bb = [x1, y1, x2, y2]else:if ((x2 - x1) * (y2 - y1)) > ((max_bb[2] - max_bb[0]) * (max_bb[3] - max_bb[3])):max_bb = [x1, y1, x2, y2]det_box = max_bbfor idx in range(len(det_box)):det_box[idx] = int(det_box[idx])x1, y1, x2, y2 = det_box# print(det_box)img_seg = img0[y1:y2, x1:x2, :]person_results = np.array([[0, 0, x2-x1, y2-y1]])# 推理得到关键点坐标pose_results = inference_topdown(pose_model, img_seg, person_results, bbox_format='xyxy')# 提取关键点坐标并检查是否检测出17个关键点keypoints = []if len(pose_results) > 0 and pose_results[0].pred_instances.keypoints.shape[1] == 17:keypoints = pose_results[0].pred_instances.keypoints[0]draw_keypoints(frame, keypoints, BOX, det_box)# 写入帧out.write(frame)# 显示帧cv2.imshow('frame', frame)if cv2.waitKey(1) & 0xFF == ord('q'):breakcap.release()out.release()cv2.destroyAllWindows()

input.mp4视频如下：

output.mp4视频如下：

大概原理是区域框内进行一系列处理后输入进yolo进行目标检测，在多个目标框内选出我们要检测的人物的目标框输入进hrnet得到关键点，关键点从目标框映射回区域框再映射回原图，得到最终结果。