调用Baidu云、人脸识别接口

总体是简单、方便的（前提有百度的开发者账号）及注意调用接口API版本，我这里是2.0,（官方在线文档还是很全的）：

using AForge.Video.DirectShow;
using Baidu.Aip.Face;
using BaiduAI.Common;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media.Imaging;
using System.Net.Http;
using Newtonsoft.Json.Linq;
using System.Net;

namespace BaiduAI
{
   
    public partial class Form1 : Form
    {
        private string APP_ID = "61";
        private string API_KEY = "GoO";
        private string SECRET_KEY = "N1m";
        private Face client = null;
        /// <summary>
        /// 是否可以检测人脸
        /// </summary>
        private bool IsStart = false;
        /// <summary>
        /// 人脸在图像中的位置
        /// </summary>
        private FaceLocation location = null;

        private FilterInfoCollection videoDevices = null;
        public Form1()
        {
            InitializeComponent();
            //client=new Face()
            client = new Face(API_KEY, SECRET_KEY);
        }

        /// <summary>
        /// 得到token
        /// </summary>
        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 = "24.08e1282dcd3b24";
            // 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 = "jcHKpGR79uLq";// "百度云应用的AK";
            // 百度云中开通对应服务应用的 Secret Key
            private static String clientSecret = "N1m89s3Bv3";//"百度云应用的SK";

            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);
                JObject res = JObject.Parse(result);
                return res["access_token"].ToString();
             
               // return result;
            }
             
        }


        public static class FaceDetect
        {
            // 人脸检测与属性分析
            //https://aip.baidubce.com/rest/2.0/face/v3/detect
            public static string detect(string image)
            {
                //image = "iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAYAAAA10dzkAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAP+lSURBVHhelP3Jr3ZLlp+H7bc/X3dv3sysTiRFWWxskSJIFatIkCxKMkgRlj0wPDFgeeCJ4YEBe+QG8MC4/iflgQ1bggFmVTb3fu1p3lbP8/tFnO9kKmXD8Z44sXc0q4sVK1bE7lb/q//8f3MjLNv1frm7u1u2q+1yuVyW6/m2rFarZbOslvV6vWzWy3K9Xpfr5THlq1XLb+tNyj1OfetuNstus03+3W6/GFb5T0od87ertlnfH3POSeA+3q5JwZDyp8t1kb4rlIQOYJvebqvQc3hzTv3z+Uo8L7dr8W7Wu6TffPNN8k/np8DbbsG93S6II=";

                //
                string token = "24.08e1282dcd3b24f1d6e7cd";// 
            
                string host = "https://aip.baidubce.com/rest/2.0/face/v3/detect?access_token=" + token;
                Encoding encoding = Encoding.Default;
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
                request.Method = "post";
                request.KeepAlive = true;
                //String str = "{"image":"027d8308a2ec9","image_type":"FACE_TOKEN","face_field":"faceshape,facetype"}";
                String str = "{"image":""+image1+ "","image_type":"BASE64","face_field":"faceshape,facetype,beauty,age"}";
                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("人脸检测与属性分析:");
                //  Console.WriteLine(result);
                JObject res = JObject.Parse(result);
                return res.ToString();
            }
        }

        /// <summary>
        /// 识别图片
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            // AccessToken.getAccessToken();
            //FaceDetect.detect();

            OpenFileDialog dialog = new OpenFileDialog();
            dialog.InitialDirectory = "D:\";
            dialog.Filter = "所有文件|*.*";
            dialog.RestoreDirectory = true;
            dialog.FilterIndex = 1;
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                string filename = dialog.FileName;
                try
                {
                    var image = File.ReadAllBytes(filename);
                    string img=  System.Text.Encoding.Default.GetString(image);
                    string re = ImgToBase64String(filename);
                   
                    // 如果有可选参数
                    var options = new Dictionary<string, object>{
                        {"max_face_num", 2},
                        {"face_fields", "age,qualities,beauty"}
                    };
                    var result = //client.Detect(image, options);
                    textBox1.Text = FaceDetect.detect(re); //result.ToString();
                    FaceDetectInfo detect = JsonHelper.DeserializeObject<FaceDetectInfo>(result.ToString());
                } catch (Exception ex)
                { }
            }

        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox2.Text) || string.IsNullOrEmpty(textBox3.Text))
            {
                MessageBox.Show("请选择要对比的人脸图片");
                return;
            }
            try
            {
                var images = new[]
                {
                    File.ReadAllBytes(textBox2.Text),
                    File.ReadAllBytes(textBox3.Text)
                };
                // 如果有可选参数
                var options = new Dictionary<string, object>{
                        {"ext_fields", "qualities"},
                        {"image_liveness", ",faceliveness"},
                        {"types", "7,13"}
                    };
                // 带参数调用人脸比对
                var result = client.Match(images, options);
                textBox1.Text = result.ToString();
            }
            catch (Exception ex)
            { }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.InitialDirectory = "D:\";
            dialog.Filter = "所有文件|*.*";
            dialog.RestoreDirectory = true;
            dialog.FilterIndex = 2;
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                if (string.IsNullOrEmpty(textBox2.Text))
                {
                    textBox2.Text = dialog.FileName;
                }
                else
                {
                    textBox3.Text = dialog.FileName;
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            /// 获取电脑已经安装的视频设备
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            if (videoDevices!=null && videoDevices.Count>0)
            {
                foreach (FilterInfo device in videoDevices)
                {
                    comboBox1.Items.Add(device.Name);
                }
                comboBox1.SelectedIndex = 0;
            }
            videoSourcePlayer1.NewFrame += VideoSourcePlayer1_NewFrame;

            // 开发者在百度AI平台人脸识别接口只能1秒中调用2次，所以需要做 定时开始检测，每个一秒检测2次
            ThreadPool.QueueUserWorkItem(new WaitCallback(p => {
                while (true)
                {
                    IsStart = true;
                    Thread.Sleep(500);
                }
            }));
        }
        /// <summary>
        /// 新场景的事件获取单帧图像
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="image"></param>
        private void VideoSourcePlayer1_NewFrame(object sender, ref Bitmap image)
        {
            try
            {
                if (IsStart)
                {
                    IsStart = false;
                    // 在线程池中另起一个线程进行人脸检测,这样不会造成界面视频卡顿现象
                    ThreadPool.QueueUserWorkItem(new WaitCallback(this.Detect), image.Clone());
                }
                if (location != null)
                {
                    try
                    {
                        // 绘制方框套住人脸
                        Graphics g = Graphics.FromImage(image);
                        g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top), new System.Drawing.Point(location.left + location.width, location.top));
                        g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top), new System.Drawing.Point(location.left, location.top + location.height));
                        g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top + location.height), new System.Drawing.Point(location.left + location.width, location.top + location.height));
                        g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left + location.width, location.top), new System.Drawing.Point(location.left + location.width, location.top + location.height));
                        g.Dispose();

                    }
                    catch (Exception ex)
                    {
                        ClassLoger.Error("VideoSourcePlayer1_NewFrame", ex);
                    }
                }
            } catch (Exception ex)
            {
                ClassLoger.Error("VideoSourcePlayer1_NewFrame1", ex);
            }

        }

        /// <summary>
        /// 连接并且打开摄像头
        /// </summary>
        private void CameraConn()
        {
            if (comboBox1.Items.Count<=0)
            {
                MessageBox.Show("请插入视频设备");
                return;
            }
            VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);
            videoSource.DesiredFrameSize = new System.Drawing.Size(320, 240);
            videoSource.DesiredFrameRate = 1;

            videoSourcePlayer1.VideoSource = videoSource;
            videoSourcePlayer1.Start();
        }
        /// <summary>
        /// 重新检测连接视频设备
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button6_Click(object sender, EventArgs e)
        {
            /// 获取电脑已经安装的视频设备
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            if (videoDevices != null && videoDevices.Count > 0)
            {
                foreach (FilterInfo device in videoDevices)
                {
                    comboBox1.Items.Add(device.Name);
                }
                comboBox1.SelectedIndex = 0;
            }
        }
        /// <summary>
        /// 拍照
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button5_Click(object sender, EventArgs e)
        {
            if (comboBox1.Items.Count <= 0)
            {
                MessageBox.Show("请插入视频设备");
                return;
            }
            try
            {
                if (videoSourcePlayer1.IsRunning)
                {
                    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                                    videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(),
                                    IntPtr.Zero,
                                     Int32Rect.Empty,
                                    BitmapSizeOptions.FromEmptyOptions());
                    PngBitmapEncoder pE = new PngBitmapEncoder();
                    pE.Frames.Add(BitmapFrame.Create(bitmapSource));
                    string picName = GetImagePath() + "\" + DateTime.Now.ToFileTime() + ".jpg";
                    if (File.Exists(picName))
                    {
                        File.Delete(picName);
                    }
                    using (Stream stream = File.Create(picName))
                    {
                        pE.Save(stream);
                    }
                    //拍照完成后关摄像头并刷新同时关窗体
                    if (videoSourcePlayer1 != null && videoSourcePlayer1.IsRunning)
                    {
                        videoSourcePlayer1.SignalToStop();
                        videoSourcePlayer1.WaitForStop();
                    }

                    this.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("摄像头异常：" + ex.Message);
            }
        }


        private string GetImagePath()
        {
            string personImgPath = Path.GetDirectoryName(AppDomain.CurrentDomain.BaseDirectory)
                         + Path.DirectorySeparatorChar.ToString() + "PersonImg";
            if (!Directory.Exists(personImgPath))
            {
                Directory.CreateDirectory(personImgPath);
            }

            return personImgPath;
        }

        #region 图片转为base64编码的字符串
        private string ImgToBase64String(string Imagefilename)
        {
            try
            {
                Bitmap bmp = new Bitmap(Imagefilename);

                MemoryStream ms = new MemoryStream();
                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                byte[] arr = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(arr, 0, (int)ms.Length);
                ms.Close();
                return Convert.ToBase64String(arr);
            }
            catch (Exception ex)
            {
                return null;
            }
        }
        #endregion

        private void button4_Click(object sender, EventArgs e)
        {
            CameraConn();
        }

        /// <summary>
        /// Bitmap 转byte[]
        /// </summary>
        /// <param name="bitmap"></param>
        /// <returns></returns>
        public byte[] Bitmap2Byte(Bitmap bitmap)
        {
            try
            {
                using (MemoryStream stream = new MemoryStream())
                {
                    bitmap.Save(stream, ImageFormat.Jpeg);
                    byte[] data = new byte[stream.Length];
                    stream.Seek(0, SeekOrigin.Begin);
                    stream.Read(data, 0, Convert.ToInt32(stream.Length));
                    return data;
                }
            } catch (Exception ex) { }
            return null;
        }
        public byte[] BitmapSource2Byte(BitmapSource source)
        {
            try
            {
                JpegBitmapEncoder encoder = new JpegBitmapEncoder();
                encoder.QualityLevel = 100;
                using (MemoryStream stream = new MemoryStream())
                {
                    encoder.Frames.Add(BitmapFrame.Create(source));
                    encoder.Save(stream);
                    byte[] bit = stream.ToArray();
                    stream.Close();
                    return bit;
                }
            } catch (Exception ex)
            {
                ClassLoger.Error("BitmapSource2Byte",ex);
            }
            return null;
        }

        /// <summary>
        /// 人脸检测
        /// </summary>
        public void Detect(object image)
        {
            if (image!=null &&  image is Bitmap)
            {
                try
                {
                    var img = (Bitmap)image;
                    var imgByte = Bitmap2Byte(img);
                    if (imgByte != null)
                    {
                        // 如果有可选参数
                        var options = new Dictionary<string, object>{
                            {"max_face_num", 2},
                            {"face_fields", "age,qualities,beauty"}
                        };
                        var result = client.Detect(imgByte,options);
                        FaceDetectInfo detect = JsonHelper.DeserializeObject<FaceDetectInfo>(result.ToString());
                        if (detect!=null && detect.result_num>0)
                        {
                            ageText.Text = detect.result[0].age.TryToString();
                            this.location = detect.result[0].location;
                            StringBuilder sb = new StringBuilder();
                            if (detect.result[0].qualities != null)
                            {
                                if (detect.result[0].qualities.blur >= 0.7)
                                {
                                    sb.AppendLine("人脸过于模糊");
                                }
                                if (detect.result[0].qualities.completeness >= 0.4)
                                {
                                    sb.AppendLine("人脸不完整");
                                }
                                if (detect.result[0].qualities.illumination <= 40)
                                {
                                    sb.AppendLine("灯光光线质量不好");
                                }
                                if (detect.result[0].qualities.occlusion!=null)
                                {
                                    if (detect.result[0].qualities.occlusion.left_cheek>=0.8)
                                    {
                                        sb.AppendLine("左脸颊不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.left_eye >= 0.6)
                                    {
                                        sb.AppendLine("左眼不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.mouth >= 0.7)
                                    {
                                        sb.AppendLine("嘴巴不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.nose >= 0.7)
                                    {
                                        sb.AppendLine("鼻子不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.right_cheek >= 0.8)
                                    {
                                        sb.AppendLine("右脸颊不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.right_eye >= 0.6)
                                    {
                                        sb.AppendLine("右眼不清晰");
                                    }
                                    if (detect.result[0].qualities.occlusion.chin >= 0.6)
                                    {
                                        sb.AppendLine("下巴不清晰");
                                    }
                                    if (detect.result[0].pitch>=20)
                                    {
                                        sb.AppendLine("俯视角度太大");
                                    }
                                    if (detect.result[0].roll>=20)
                                    {
                                        sb.AppendLine("脸部应该放正");
                                    }
                                    if (detect.result[0].yaw>=20)
                                    {
                                        sb.AppendLine("脸部应该放正点");
                                    }
                                }
                                
                            }
                            if (detect.result[0].location.height<=100 || detect.result[0].location.height<=100)
                            {
                                sb.AppendLine("人脸部分过小");
                            }
                            textBox4.Text = sb.ToString();
                            if (textBox4.Text.IsNull())
                            {
                                textBox4.Text = "OK";
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    ClassLoger.Error("Form1.image", ex);
                }
            }
            
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            System.Environment.Exit(0);
        }

        /// <summary>
        /// 人脸注册
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button7_Click(object sender, EventArgs e)
        {
            // 用户ID
            string uid = "1";
            // 用户资料，长度限制256B
            string userInfo = textBox6.Text.Trim();
            // 用户组ID
            string groupId = textBox5.Text.Trim();

            if (comboBox1.Items.Count <= 0)
            {
                MessageBox.Show("请插入视频设备");
                return;
            }
            try
            {
                if (videoSourcePlayer1.IsRunning)
                {
                    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                                    videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(),
                                    IntPtr.Zero,
                                     Int32Rect.Empty,
                                    BitmapSizeOptions.FromEmptyOptions());
                    var img = BitmapSource2Byte(bitmapSource);
                    var options = new Dictionary<string, object>{
                        {"action_type", "replace"}
                    };
                    var result = client.UserAdd(uid, userInfo, groupId, img, options);
                    if (result.ToString().Contains("error_code"))
                    {
                        MessageBox.Show("注册失败:" + result.ToString());
                    }
                    else
                    {
                        MessageBox.Show("注册成功");
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("摄像头异常：" + ex.Message);
            }
        }
        /// <summary>
        /// 人脸登录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button8_Click(object sender, EventArgs e)
        {
            // 用户ID
            string uid = "1";
            // 用户资料，长度限制256B
            string userInfo = textBox6.Text.Trim();
            // 用户组ID
            string groupId = textBox5.Text.Trim();

            if (comboBox1.Items.Count <= 0)
            {
                MessageBox.Show("请插入视频设备");
                return;
            }
            try
            {
                if (videoSourcePlayer1.IsRunning)
                {
                    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                                    videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(),
                                    IntPtr.Zero,
                                     Int32Rect.Empty,
                                    BitmapSizeOptions.FromEmptyOptions());
                    var img = BitmapSource2Byte(bitmapSource);

                    // 如果有可选参数
                    //var options = new Dictionary<string, object>{
                    //    {"ext_fields", "faceliveness"},
                    //    {"user_top_num", 3}
                    //};

                    var result = client.Identify(groupId, img);
                    FaceIdentifyInfo info = JsonHelper.DeserializeObject<FaceIdentifyInfo>(result.ToString());
                    if (info!=null && info.result!=null && info.result.Length>0)
                    {
                        textBox7.Text = info.result[0].user_info;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("摄像头异常：" + ex.Message);
            }
        }

        private void videoSourcePlayer1_Click(object sender, EventArgs e)
        {

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}