人体分析

    人体关键点识别

    接口描述

    对于输入的一张图片(可正常解码,且长宽比适宜),检测图片中的所有人体,输出每个人体的21个主要关键点,包含头顶、五官、脖颈、四肢等部位,同时输出人体的坐标信息和数量

    支持多人检测、人体位置重叠、遮挡、背面、侧面、中低空俯拍、大动作等复杂场景。

    21个关键点的位置:头顶、左耳、右耳、左眼、右眼、鼻子、左嘴角、右嘴角、脖子、左肩、右肩、左手肘、右手肘、左手腕、右手腕、左髋部、右髋部、左膝、右膝、左脚踝、右脚踝。示意图如下,正在持续扩展更多关键点,敬请期待。

    单人场景:

    多人场景:

    请求说明

    请求示例

    HTTP 方法:POST

    请求URL: https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis

    URL参数:

    参数
    access_token 通过API Key和Secret Key获取的access_token,参考“Access Token获取

    Header如下:

    参数
    Content-Type application/x-www-form-urlencoded

    Body中放置请求参数,参数详情如下:

    请求参数

    参数 是否必选 类型 可选值范围 说明
    image string - 图像数据,base64编码后进行urlencode,要求base64编码和urlencode后大小不超过4M。图片的base64编码是不包含图片头的,如(data:image/jpg;base64,),支持图片格式:jpg、bmp、png,最短边至少50px,最长边最大4096px

    请求代码示例

    提示一:使用示例代码前,请记得替换其中的示例Token、图片地址或Base64信息。

    提示二:部分语言依赖的类或库,请在代码注释中查看下载地址。

    人体关键点识别
    curl -i -k 'https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis?access_token=【调用鉴权接口获取的token】' --data 'image=【图片Base64编码,需UrlEncode】' -H 'Content-Type:application/x-www-form-urlencoded'
    <?php
    /**
     * 发起http post请求(REST API), 并获取REST请求的结果
     * @param string $url
     * @param string $param
     * @return - http response body if succeeds, else false.
     */
    function request_post($url = '', $param = '')
    {
        if (empty($url) || empty($param)) {
            return false;
        }
    
        $postUrl = $url;
        $curlPost = $param;
        // 初始化curl
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $postUrl);
        curl_setopt($curl, CURLOPT_HEADER, 0);
        // 要求结果为字符串且输出到屏幕上
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        // post提交方式
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
        // 运行curl
        $data = curl_exec($curl);
        curl_close($curl);
    
        return $data;
    }
    
    $token = '[调用鉴权接口获取的token]';
    $url = 'https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis?access_token=' . $token;
    $img = file_get_contents('[本地文件路径]');
    $img = base64_encode($img);
    $bodys = array(
        'image' => $img
    );
    $res = request_post($url, $bodys);
    
    var_dump($res);~~~~
    package com.baidu.ai.aip;
    
    import com.baidu.ai.aip.utils.Base64Util;
    import com.baidu.ai.aip.utils.FileUtil;
    import com.baidu.ai.aip.utils.HttpUtil;
    
    import java.net.URLEncoder;
    
    /**
    * 人体关键点识别
    */
    public class BodyAnalysis {
    
        /**
        * 重要提示代码中所需工具类
        * FileUtil,Base64Util,HttpUtil,GsonUtils请从
        * https://ai.baidu.com/file/658A35ABAB2D404FBF903F64D47C1F72
        * https://ai.baidu.com/file/C8D81F3301E24D2892968F09AE1AD6E2
        * https://ai.baidu.com/file/544D677F5D4E4F17B4122FBD60DB82B3
        * https://ai.baidu.com/file/470B3ACCA3FE43788B5A963BF0B625F3
        * 下载
        */
        public static String body_analysis() {
            // 请求url
            String url = "https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis";
            try {
                // 本地文件路径
                String filePath = "[本地文件路径]";
                byte[] imgData = FileUtil.readFileByBytes(filePath);
                String imgStr = Base64Util.encode(imgData);
                String imgParam = URLEncoder.encode(imgStr, "UTF-8");
    
                String param = "image=" + imgParam;
    
                // 注意这里仅为了简化编码每一次请求都去获取access_token,线上环境access_token有过期时间, 客户端可自行缓存,过期后重新获取。
                String accessToken = "[调用鉴权接口获取的token]";
    
                String result = HttpUtil.post(url, accessToken, param);
                System.out.println(result);
                return result;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    
        public static void main(String[] args) {
            BodyAnalysis.body_analysis();
        }
    }
    # encoding:utf-8
    
    import requests
    import base64
    
    '''
    人体关键点识别
    '''
    
    request_url = "https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis"
    # 二进制方式打开图片文件
    f = open('[本地文件]', 'rb')
    img = base64.b64encode(f.read())
    
    params = {"image":img}
    access_token = '[调用鉴权接口获取的token]'
    request_url = request_url + "?access_token=" + access_token
    headers = {'content-type': 'application/x-www-form-urlencoded'}
    response = requests.post(request_url, data=params, headers=headers)
    if response:
        print (response.json())
    #include <iostream>
    #include <curl/curl.h>
    
    // libcurl库下载链接:https://curl.haxx.se/download.html
    // jsoncpp库下载链接:https://github.com/open-source-parsers/jsoncpp/
    const static std::string request_url = "https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis";
    static std::string body_analysis_result;
    /**
     * curl发送http请求调用的回调函数,回调函数中对返回的json格式的body进行了解析,解析结果储存在全局的静态变量当中
     * @param 参数定义见libcurl文档
     * @return 返回值定义见libcurl文档
     */
    static size_t callback(void *ptr, size_t size, size_t nmemb, void *stream) {
        // 获取到的body存放在ptr中,先将其转换为string格式
        body_analysis_result = std::string((char *) ptr, size * nmemb);
        return size * nmemb;
    }
    /**
     * 人体关键点识别
     * @return 调用成功返回0,发生错误返回其他错误码
     */
    int body_analysis(std::string &json_result, const std::string &access_token) {
        std::string url = request_url + "?access_token=" + access_token;
        CURL *curl = NULL;
        CURLcode result_code;
        int is_success;
        curl = curl_easy_init();
        if (curl) {
            curl_easy_setopt(curl, CURLOPT_URL, url.data());
            curl_easy_setopt(curl, CURLOPT_POST, 1);
            curl_httppost *post = NULL;
            curl_httppost *last = NULL;
            curl_formadd(&post, &last, CURLFORM_COPYNAME, "image", CURLFORM_COPYCONTENTS, "【base64_img】", CURLFORM_END);
    
            curl_easy_setopt(curl, CURLOPT_HTTPPOST, post);
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, callback);
            result_code = curl_easy_perform(curl);
            if (result_code != CURLE_OK) {
                fprintf(stderr, "curl_easy_perform() failed: %s\n",
                        curl_easy_strerror(result_code));
                is_success = 1;
                return is_success;
            }
            json_result = body_analysis_result;
            curl_easy_cleanup(curl);
            is_success = 0;
        } else {
            fprintf(stderr, "curl_easy_init() failed.");
            is_success = 1;
        }
        return is_success;
    }
    using System;
    using System.IO;
    using System.Net;
    using System.Text;
    using System.Web;
    
    namespace com.baidu.ai
    {
        public class BodyAnalysis
        {
            // 人体关键点识别
            public static string body_analysis()
            {
                string token = "[调用鉴权接口获取的token]";
                string host = "https://aip.baidubce.com/rest/2.0/image-classify/v1/body_analysis?access_token=" + token;
                Encoding encoding = Encoding.Default;
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
                request.Method = "post";
                request.KeepAlive = true;
                // 图片的base64编码
                string base64 = getFileBase64("[本地图片文件]");
                String str = "image=" + HttpUtility.UrlEncode(base64);
                byte[] buffer = encoding.GetBytes(str);
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
                string result = reader.ReadToEnd();
                Console.WriteLine("人体关键点识别:");
                Console.WriteLine(result);
                return result;
            }
    
            public static String getFileBase64(String fileName) {
                FileStream filestream = new FileStream(fileName, FileMode.Open);
                byte[] arr = new byte[filestream.Length];
                filestream.Read(arr, 0, (int)filestream.Length);
                string baser64 = Convert.ToBase64String(arr);
                filestream.Close();
                return baser64;
            }
        }
    }

    返回说明

    接口除了返回人体框和每个关键点的坐标信息外,还会输出人体框和关键点的概率分数,实际应用中可以基于概率分数进行过滤,排除掉分数低的误识别“无效人体”推荐的过滤方案:当关键点得分大于0.2的个数大于3,且人体框的得分大于0.03时,才认为是有效人体

    实际应用中,可根据对误识别、漏识别的容忍程度,调整阈值过滤方案,灵活应用,比如对误识别容忍低的应用场景,人体框的得分阈值可以提到0.06甚至更高。

    返回参数

    字段 是否必选 类型 说明
    log_id uint64 唯一的log id,用于问题定位
    person_num uint32 人体数目
    person_info object[] 人体姿态信息
    +location object 人体坐标信息
    ++height float 人体区域的高度
    ++left float 人体区域离左边界的距离
    ++top float 人体区域离上边界的距离
    ++width float 人体区域的宽度
    ++score float 人体框的概率分数,取值0-1,得分越接近1表示识别准确的概率越大
    +body_parts object 身体部位信息,包含21个关键点
    ++top_head object 头顶
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_eye object 左眼
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_eye object 右眼
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++nose object 鼻子
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_ear object 左耳
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_ear object 右耳
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_mouth_corner object 左嘴角
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_mouth_corner object 右嘴角
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++neck object 颈部
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_shoulder object 左肩
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_shoulder object 右肩
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_elbow object 左手肘
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_elbow object 右手肘
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_wrist object 左手腕
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_wrist object 右手腕
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_hip object 左髋部
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_hip object 右髋部
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_knee object 左膝
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_knee object 右膝
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++left_ankle object 左脚踝
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数
    ++right_ankle object 右脚踝
    +++x float x坐标
    +++y float y坐标
    +++score float 概率分数

    说明:

    1、body_parts,一共21个part,每个part包含x,y两个坐标,如果part被截断,则x、y坐标为part被截断的图片边界位置,part顺序以实际返回顺序为准。

    2、接口返回人体坐标框和每个关键点的置信度分数,在应用时可综合置信度score分数,过滤掉置信度低的“无效人体”,建议过滤方法:当关键点得分大于0.2的个数大于3,且人体框的分数大于0.03时,才认为是有效人体。实际应用中,可根据对误识别、漏识别的容忍程度,调整阈值过滤方案,灵活应用。

    返回示例

    {
    	"person_num": 2,
    	"person_info": [
    		{
    			"body_parts": {
    				"left_hip": {
    					"y": 573,
    					"x": 686.09375,
    					"score": 0.78743487596512
    				},
    				"top_head": {
    					"y": 242.53125,
    					"x": 620,
    					"score": 0.87757384777069
    				},
    				"right_mouth_corner": {
    					"y": 308.625,
    					"x": 606.78125,
    					"score": 0.90121293067932
    				},
    				"neck": {
    					"y": 335.0625,
    					"x": 620,
    					"score": 0.84662038087845
    				},
    				"left_shoulder": {
    					"y": 361.5,
    					"x": 699.3125,
    					"score": 0.83550786972046
    				},
    				"left_knee": {
    					"y": 731.625,
    					"x": 699.3125,
    					"score": 0.83575332164764
    				},
    				"left_ankle": {
    					"y": 877.03125,
    					"x": 725.75,
    					"score": 0.85220056772232
    				},
    				"left_mouth_corner": {
    					"y": 308.625,
    					"x": 633.21875,
    					"score": 0.91475087404251
    				},
    				"right_elbow": {
    					"y": 348.28125,
    					"x": 461.375,
    					"score": 0.81766486167908
    				},
    				"right_ear": {
    					"y": 282.1875,
    					"x": 593.5625,
    					"score": 0.86551451683044
    				},
    				"nose": {
    					"y": 295.40625,
    					"x": 620,
    					"score": 0.90894532203674
    				},
    				"left_eye": {
    					"y": 282.1875,
    					"x": 633.21875,
    					"score": 0.89628517627716
    				},
    				"right_eye": {
    					"y": 282.1875,
    					"x": 606.78125,
    					"score": 0.89676940441132
    				},
    				"right_hip": {
    					"y": 586.21875,
    					"x": 593.5625,
    					"score": 0.79803824424744
    				},
    				"left_wrist": {
    					"y": 374.71875,
    					"x": 884.375,
    					"score": 0.89635348320007
    				},
    				"left_ear": {
    					"y": 295.40625,
    					"x": 659.65625,
    					"score": 0.86607384681702
    				},
    				"left_elbow": {
    					"y": 361.5,
    					"x": 791.84375,
    					"score": 0.83910942077637
    				},
    				"right_shoulder": {
    					"y": 348.28125,
    					"x": 553.90625,
    					"score": 0.85635334253311
    				},
    				"right_ankle": {
    					"y": 890.25,
    					"x": 580.34375,
    					"score": 0.85149073600769
    				},
    				"right_knee": {
    					"y": 744.84375,
    					"x": 580.34375,
    					"score": 0.83749794960022
    				},
    				"right_wrist": {
    					"y": 348.28125,
    					"x": 368.84375,
    					"score": 0.83893859386444
    				}
    			},
    			"location": {
    				"height": 703.20654296875,
    				"width": 652.61810302734,
    				"top": 221.92272949219,
    				"score": 0.99269664287567,
    				"left": 294.03039550781
    			}
    		},
    		{
    			"body_parts": {
    				"left_hip": {
    					"y": 576,
    					"x": 1239.5625,
    					"score": 0.84608125686646
    				},
    				"top_head": {
    					"y": 261.15625,
    					"x": 1176.59375,
    					"score": 0.871442258358
    				},
    				"right_mouth_corner": {
    					"y": 336.71875,
    					"x": 1164,
    					"score": 0.90951544046402
    				},
    				"neck": {
    					"y": 361.90625,
    					"x": 1176.59375,
    					"score": 0.85904294252396
    				},
    				"left_shoulder": {
    					"y": 361.90625,
    					"x": 1239.5625,
    					"score": 0.8512310385704
    				},
    				"left_knee": {
    					"y": 714.53125,
    					"x": 1277.34375,
    					"score": 0.82312393188477
    				},
    				"left_ankle": {
    					"y": 853.0625,
    					"x": 1315.125,
    					"score": 0.83786374330521
    				},
    				"left_mouth_corner": {
    					"y": 336.71875,
    					"x": 1189.1875,
    					"score": 0.90610301494598
    				},
    				"right_elbow": {
    					"y": 387.09375,
    					"x": 1025.46875,
    					"score": 0.88956367969513
    				},
    				"right_ear": {
    					"y": 311.53125,
    					"x": 1138.8125,
    					"score": 0.86518502235413
    				},
    				"nose": {
    					"y": 324.125,
    					"x": 1176.59375,
    					"score": 0.9168484210968
    				},
    				"left_eye": {
    					"y": 311.53125,
    					"x": 1189.1875,
    					"score": 0.91715461015701
    				},
    				"right_eye": {
    					"y": 311.53125,
    					"x": 1164,
    					"score": 0.90343600511551
    				},
    				"right_hip": {
    					"y": 576,
    					"x": 1164,
    					"score": 0.81976848840714
    				},
    				"left_wrist": {
    					"y": 298.9375,
    					"x": 1378.09375,
    					"score": 0.86095398664474
    				},
    				"left_ear": {
    					"y": 311.53125,
    					"x": 1201.78125,
    					"score": 0.86899447441101
    				},
    				"left_elbow": {
    					"y": 324.125,
    					"x": 1315.125,
    					"score": 0.89198768138885
    				},
    				"right_shoulder": {
    					"y": 387.09375,
    					"x": 1101.03125,
    					"score": 0.85161662101746
    				},
    				"right_ankle": {
    					"y": 878.25,
    					"x": 1151.40625,
    					"score": 0.83667933940887
    				},
    				"right_knee": {
    					"y": 727.125,
    					"x": 1151.40625,
    					"score": 0.85485708713531
    				},
    				"right_wrist": {
    					"y": 387.09375,
    					"x": 949.90625,
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