C#调用百度API实现活体检测是一个可以应用在人脸识别等领域的重要技术。本攻略将会介绍如何使用百度AI开发平台的活体检测API,并给出两个详细的示例。
步骤一:注册百度AI开发平台
在使用百度API前,需要先注册百度AI开发平台账号,完成OAuth2.0认证。
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打开百度AI开发平台首页,点击右上角“注册”按钮,创建账号。
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登录账号后,进入“控制台”页面,在“应用列表”中创建应用并获取API Key和Secret Key。
步骤二:获取AccessToken
通过API Key和Secret Key获取Access Token(访问令牌),可使用以下代码:
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=【YOUR API KEY】&client_secret=【YOUR SECRET KEY】");
req.Method = "GET";
using (WebResponse wr = req.GetResponse())
{
using (StreamReader reader = new StreamReader(wr.GetResponseStream()))
{
string access_token = JObject.Parse(reader.ReadToEnd())["access_token"].ToString();
}
}
步骤三:调用活体检测API
使用已经获取的Access Token调用百度活体检测API,可使用以下代码:
string url = "https://aip.baidubce.com/rest/2.0/face/v3/faceverify?access_token=" + access_token;
string apiKey = "YOUR_API_KEY";
string apiSecret = "YOUR_API_SECRET";
// 构建POST请求参数
StringBuilder reqBuilder = new StringBuilder();
reqBuilder.Append("{\"image\":\"" + imgBase64 + "\",");
reqBuilder.Append("\"face_field\":\"qualities,eye_status,face_shape\",\"image_type\":\"BASE64\",");
reqBuilder.Append("\"liveness_control\":\"HIGH\",\"client_info\":\"{\\\"platform\\\":\\\"PC\\\"}\"}");
// 发送POST请求
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/json";
req.Headers.Add("apikey", apiKey);
req.Headers.Add("apisecret", apiSecret);
using (StreamWriter writer = new StreamWriter(req.GetRequestStream()))
{
writer.Write(reqBuilder.ToString());
writer.Flush();
}
// 获取响应
using (WebResponse wr = req.GetResponse())
{
using (StreamReader reader = new StreamReader(wr.GetResponseStream()))
{
string result = reader.ReadToEnd();
Console.WriteLine(result);
}
}
其中,imgBase64为要检测的图片的Base64编码。
示例一:活体检测
检测一张本地图片,获取活体检测结果。
// 将图片转换成Base64编码
string imgPath = @"C:\test.png";
string imgBase64 = Convert.ToBase64String(File.ReadAllBytes(imgPath));
// 活体检测API调用
string url = "https://aip.baidubce.com/rest/2.0/face/v3/faceverify?access_token=" + access_token;
…
using (WebResponse wr = req.GetResponse())
{
using (StreamReader reader = new StreamReader(wr.GetResponseStream()))
{
string result = reader.ReadToEnd();
Console.WriteLine(result);
}
}
// 处理返回结果
JObject resJObject = JObject.Parse(result);
if ((int)resJObject["error_code"] == 0)
{
bool isLive = resJObject["result"]["face_liveness"].Value<string>() == "LIVE";
Console.WriteLine(isLive ? "真人" : "非真人");
}
else
{
Console.WriteLine("检测失败,错误码:" + resJObject["error_code"]);
}
示例二:摄像头实时活体检测
使用WebCam从电脑摄像头中获取视频流,并实现实时活体检测。
WebCam webCam = new WebCam();
webCam.OnImageCaptured += (img) =>
{
Console.WriteLine("人脸检测中...");
// 将图片转换成Base64编码
string imgBase64 = Convert.ToBase64String(ImageUtil.ImageToBytes(img, ImageFormat.Png));
// 活体检测API调用
string url = "https://aip.baidubce.com/rest/2.0/face/v3/faceverify?access_token=" + access_token;
…
using (WebResponse wr = req.GetResponse())
{
using (StreamReader reader = new StreamReader(wr.GetResponseStream()))
{
string result = reader.ReadToEnd();
Console.WriteLine(result);
}
}
// 处理返回结果
JObject resJObject = JObject.Parse(result);
if ((int)resJObject["error_code"] == 0)
{
bool isLive = resJObject["result"]["face_liveness"].Value<string>() == "LIVE";
Console.WriteLine(isLive ? "真人" : "非真人");
}
else
{
Console.WriteLine("检测失败,错误码:" + resJObject["error_code"]);
}
};
webCam.Start();
以上就是使用C#调用百度API实现活体检测的完整攻略,通过以上步骤和两个示例,您应该可以轻松地实现活体检测功能。
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