人脸识别之人脸对比 【C#】

第一步：登录百度云

网址：https://login.bce.baidu.com

没有账号就自己注册一个

第二步：创建应用，获取API Key 和 Secret Key

第三步：获取Access Token

官方文档参考

代码：

using System;
using System.Collections.Generic;
using System.Net.Http;

namespace com.baidu.ai
{
    public static class AccessToken

    {
        // 调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存
        // 返回token示例
        public static String TOKEN = "24.adda70c11b9786206253ddb70affdc46.2592000.1493524354.282335-1234567";

        // 百度云中开通对应服务应用的 API Key 建议开通应用的时候多选服务
        private static String clientId = "xxxxxxxxxxxxxxxxxxxxxxxxxxx";
        // 百度云中开通对应服务应用的 Secret Key
        private static String clientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxx";

        public static String getAccessToken()
        {
            String authHost = "https://aip.baidubce.com/oauth/2.0/token";
            HttpClient client = new HttpClient();
            List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();
            paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
            paraList.Add(new KeyValuePair<string, string>("client_id", clientId));
            paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));

            HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
            String result = response.Content.ReadAsStringAsync().Result;
            //Console.WriteLine(result);
            return result;
        }
    }

}

注意的点：System.Net.Http 这个包的引入必须是.Net Framework 4.5及以上才有！

第四步：发送请求至百度云人脸对比接口

官方文档

代码：

using System;
using System.IO;
using System.Net;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace com.baidu.ai
{
    public class FaceMatch
    {
        // 人脸对比
        public static string match()
        {
            string token = AccessToken.getAccessToken();//调用鉴权接口获取的token
            string host = "https://aip.baidubce.com/rest/2.0/face/v3/match?access_token=" + token;
            Encoding encoding = Encoding.Default;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
            request.Method = "post";
            string basePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
            //D:\colde\workspace\visualstudio2015\project\com.baidu.ai\com.baidu.ai\bin\Debug\zp.bmp
            string image_IdCard = Convert.ToBase64String(System.IO.File.ReadAllBytes(basePath + "zp.bmp"));
            string image_Live = Convert.ToBase64String(System.IO.File.ReadAllBytes(basePath + "liveIMG.jpg"));
            request.KeepAlive = true;
            String str = "[{\"image\":\""+ image_IdCard + "\",\"image_type\":\"BASE64\",\"face_type\":\"IDCARD\",\"quality_control\":\"LOW\",\"liveness_control\":\"HIGH\"},{\"image\":\"" + image_Live + "\",\"image_type\":\"BASE64\",\"face_type\":\"LIVE\",\"quality_control\":\"LOW\",\"liveness_control\":\"HIGH\"}]";
            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("人脸对比:");
            //Console.WriteLine(result);
            JObject returnJson = (JObject)JsonConvert.DeserializeObject(result);
            if ("0".Equals(returnJson["error_code"].ToString())&& "SUCCESS".Equals(returnJson["error_msg"].ToString()))
            {
                JObject resultJson = (JObject)JsonConvert.DeserializeObject(returnJson["result"].ToString());
                if (Convert.ToDecimal(resultJson["score"].ToString()) > 90)
                {
                    result = "为同一人！";
                }
                else
                {
                    result = "不是同一人，请视情况报警！";
                }
            }else
            {
                Console.WriteLine(result);
            }
            return result;
        }
    }

}

第五步：结果展示

返回值：

{"error_code":0,"error_msg":"SUCCESS","log_id":1545101351575,"timestamp":1531378774,"cached":0,

"result":{"score":18.9715271,

"face_list":[{"face_token":"672bfbfb06e20c881e8b75df44bec5e7"},{"face_token":"c57fab58fdb600f03d6b6b1e5863532e"}]}

}