百度AI—人脸在线比对

首先访问百度AI网站：https://cloud.baidu.com/，按照下图的指示点开到应用管理的页面。

穿件完成之后到管理中可以查看到对应的

添加工具类：

using System;
using System.IO;

namespace FaceCompare_Console
{
    class FileUtils
    {
        /// <summary>
        /// 返回路径所指文件的base64编码
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string getFileBase64(string path)
        {
            if (!File.Exists(path))
                return "";

            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, , buffer.Length);
            fs.Close();
            return Convert.ToBase64String(buffer);
        }
    }
}

添加Token类：（注意：获取的Token30天才会更新一次，因此最好不要每次都获取，而是应该获取一次存储在本地，30天后再更新）

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

namespace FaceCompare_Console
{
    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 = "24.4c28a8feedb8a2c71fa552522284641f.2592000.1546578079.282335-15054444";

        // 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 = "*********************";
        // 百度云中开通对应服务应用的 Secret Key
        private static String clientSecret = "**********************";

        /// <summary>
        /// 获取Token
        /// </summary>
        /// <returns></returns>
        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;
            LitJson.JsonData jd = LitJson.JsonMapper.ToObject(result);
            return jd["access_token"].ToString();
        }
    }
}

接下来是面部比对的代码：

using System;
using System.IO;
using System.Net;
using System.Text;

namespace FaceCompare_Console
{
    class FaceMatch
    {
        /// <summary>
        /// 人脸比对
        /// </summary>
        /// <param name="token">token</param>
        /// <param name="img1">图像1文件路径</param>
        /// <param name="img2">图像2文件路径</param>
        /// <returns>json格式</returns>
        public static string match(string token, string img1, string img2)
        {
            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";
            request.KeepAlive = true;
            String str = "[{\"image\":\"" + FileUtils.getFileBase64(img1) + "\",\"image_type\":\"BASE64\",\"face_type\":\"LIVE\",\"quality_control\":\"LOW\",\"liveness_control\":\"NONE\"},{\"image\":\"" + FileUtils.getFileBase64(img2) + "\",\"image_type\":\"BASE64\",\"face_type\":\"LIVE\",\"quality_control\":\"LOW\",\"liveness_control\":\"NONE\"}]";
            byte[] buffer = encoding.GetBytes(str);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, , 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);
            return result;
        }
    }
}

最后是主程序中调用比对程序进行比对：

using System;

namespace FaceCompare_Console
{
    class Program
    {
        static void Main(string[] args)
        {
            AccessToken.getAccessToken();
            FaceMatch.match(AccessToken.TOKEN, @"D:\Compare\web.jpg", @"D:\Compare\web1.jpg");
            Console.ReadKey();
        }
    }
}

输出的结果如下：

score 是比对的结果分值，满分100，根据比对的要求判断分值多少属于比对程序即可。

更加详细的参数说明可以访问官网查看：https://ai.baidu.com/docs#/Face-Match-V3/top

补充：代码中用到Http.Net这些类可以去Nuget管理中在线查找并下载：

对返回结果的json格式需要解析的话也可以在Nuget中搜索Newtonsoft或者Litjson进行解析！