编程如画，我是panda！

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前言

之前给大家分享了如何搭建openpose环境，并进行了测试案例，但是如果要使用摄像头的话，还需要修改一下运行文件，并且这次会教大家如何输出到json文件 。

如果环境还没有搭建好，请参见我的博客：openpose环境搭建

一、了解输出格式

输出：

如果你使用一张图片进行测试，会得到一个n*25*3的矩阵， n代表检测到了几个人，25代表25个节点，3代表了（x坐标，y坐标，置信度）。

25个节点分别为：

// const std::map<unsigned int, std::string> POSE_BODY_25_BODY_PARTS {
//     {0,  "Nose"},
//     {1,  "Neck"},
//     {2,  "RShoulder"},
//     {3,  "RElbow"},
//     {4,  "RWrist"},
//     {5,  "LShoulder"},
//     {6,  "LElbow"},
//     {7,  "LWrist"},
//     {8,  "MidHip"},
//     {9,  "RHip"},
//     {10, "RKnee"},
//     {11, "RAnkle"},
//     {12, "LHip"},
//     {13, "LKnee"},
//     {14, "LAnkle"},
//     {15, "REye"},
//     {16, "LEye"},
//     {17, "REar"},
//     {18, "LEar"},
//     {19, "LBigToe"},
//     {20, "LSmallToe"},
//     {21, "LHeel"},
//     {22, "RBigToe"},
//     {23, "RSmallToe"},
//     {24, "RHeel"},
//     {25, "Background"}
// };

二、使用摄像头

openpose中有很多参数，可以使用参数来控制是否使用摄像头：

import os
import sys
import cv2
from sys import platform
import argparse
import numpy as npdir_path = os.path.dirname(os.path.realpath(__file__))
sys.path.append(dir_path)
os.environ['PATH'] = os.environ['PATH'] + ';' + dir_path + '/bin;'
import pyopenpose as opprint(op)
print("成功引入pyopenpose")parser = argparse.ArgumentParser()
parser.add_argument("--camera", default=0, help="Camera index for capturing video. Default is 0.")
args = parser.parse_known_args()# Custom Params
params = dict()
params["model_folder"] = "models/"
params["net_resolution"] = "368x256"# Starting OpenPose
opWrapper = op.WrapperPython()
opWrapper.configure(params)
opWrapper.start()# Start capturing from the camera
cap = cv2.VideoCapture(int(args[0].camera))while True:# Read a frame from the cameraret, frame = cap.read()if not ret:break# Process the framedatum = op.Datum()datum.cvInputData = frameopWrapper.emplaceAndPop(op.VectorDatum([datum]))# Display the resultprint("Body keypoints: \n" + str(datum.poseKeypoints))cv2.imshow("OpenPose 1.7.0 - Tutorial Python API", datum.cvOutputData)# Break the loop when 'q' is pressedif cv2.waitKey(1) & 0xFF == ord('q'):break# Release resources
cap.release()
cv2.destroyAllWindows()
opWrapper.stop()

如果你想输出到json文件，可以设置参数：

params["write_json"] = "json_output/"  # 指定保存 JSON 文件的目录

完整代码如下：

import os
import sys
import cv2
from sys import platform
import argparse
import json  # 添加 json 模块dir_path = os.path.dirname(os.path.realpath(__file__))
sys.path.append(dir_path)
os.environ['PATH'] = os.environ['PATH'] + ';' + dir_path + '/bin;'
import pyopenpose as opprint(op)
print("成功引入pyopenpose")parser = argparse.ArgumentParser()
parser.add_argument("--camera", default=0, help="Camera index for capturing video. Default is 0.")
args = parser.parse_known_args()# Custom Params
params = dict()
params["model_folder"] = "models/"
params["net_resolution"] = "368x256"
params["write_json"] = "json_output/"  # 指定保存 JSON 文件的目录# Starting OpenPose
opWrapper = op.WrapperPython()
opWrapper.configure(params)
opWrapper.start()# Start capturing from the camera
cap = cv2.VideoCapture(int(args[0].camera))while True:# Read a frame from the cameraret, frame = cap.read()if not ret:break# Process the framedatum = op.Datum()datum.cvInputData = frameopWrapper.emplaceAndPop(op.VectorDatum([datum]))# Display the resultprint("Body keypoints: \n" + str(datum.poseKeypoints))# Check if JSON file exists and read keypoints from JSONjson_path = os.path.join(params["write_json"], f"{str(args[0].camera)}.json")if os.path.exists(json_path):with open(json_path, 'r') as json_file:json_data = json.load(json_file)keypoints = json_data["people"][0]["pose_keypoints_2d"]print("Body keypoints from JSON: \n", keypoints)cv2.imshow("OpenPose 1.7.0 - Tutorial Python API", datum.cvOutputData)# Break the loop when 'q' is pressedif cv2.waitKey(1) & 0xFF == ord('q'):break# Release resources
cap.release()
cv2.destroyAllWindows()
opWrapper.stop()

结果：（要把摄像头打开哈，我就不打开了(●'◡'●)）

然后会得到json文件夹：