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最近学习人脸识别相关的东西，在MFC下使用OpenCV做了一个简单的应用。训练需要较多的数据，windows应用程序终究还是不方便，于是想着做成CS模式：检测识别都放在服务器端，视频获取和显示都放在网页端。
在网上找了一些资料，实现了简单的人脸检测。人脸识别只要在这个框架上加点代码就行。主要参考了下面这篇文章：
http://www.open-open.com/home/space-361-do-blog-id-8960.html
jetty版本：jetty-9.2.17.v20160517
javacv版本：1.2
首先是html代码，主要实现：
- 获取视频并显示（html5, webrtc, javascript）；
- 通过websocket传输视频帧；
- 接收并显示服务器端返回的图像数据（包含人脸检测结果）
1 <!doctype html>
2 <html lang="zh-CN">
3 <head>
4 <meta charset="UTF-8">
5 <title>FaceDetect</title>
6 </head>
7 <body>
8
9 <div style="visibility:hidden; width:0; height:0;">
10 <canvas id="canvas" width="320" height="240"></canvas>
11 </div>
12
13 <div>
14 <video id="video" autoplay style="display: inline;"></video>
15 <img id="target" style="display:inline;"/>
16 </div>
17
18 <script type="text/javascript">
19
20 var ws = new WebSocket("ws://127.0.0.1:2014/");
21 ws.binaryType = "arraybuffer";
22
23 ws.onopen = function() {
24 ws.send("I'm client");
25 };
26
27 ws.onmessage = function (evt) {
28 var bytes = new Uint8Array(evt.data);
29 var data = "";
30 var len = bytes.byteLength;
31 for (var i = 0; i < len; ++i) {
32 data += String.fromCharCode(bytes);
33 }
34 var img = document.getElementById("target");
35 img.src = "data:image/png;base64,"+window.btoa(data);
36 };
37
38 ws.onclose = function() {
39 alert("Closed");
40 };
41
42 ws.onerror = function(err) {
43 alert("Error: " + err);
44 };
45
46 var getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia);
47
48 var video = document.getElementById('video');
49 var canvas = document.getElementById('canvas');
50 var ctx = canvas.getContext('2d');
51
52 getUserMedia.call(navigator, {
53 video: true,
54 audio: true
55 }, function(localMediaStream) {
56 video.src = window.URL.createObjectURL(localMediaStream);
57 video.onloadedmetadata = function(e) {
58 console.log("Label: " + localMediaStream.label);
59 console.log("AudioTracks" , localMediaStream.getAudioTracks());
60 console.log("VideoTracks" , localMediaStream.getVideoTracks());
61 };
62 }, function(e) {
63 console.log('Reeeejected!', e);
64 });
65
66 function dataURItoBlob(dataURI) {
67 // convert base64/URLEncoded data component to raw binary data held in a string
68 var byteString;
69 if (dataURI.split(',')[0].indexOf('base64') >= 0)
70 byteString = atob(dataURI.split(',')[1]);
71 else
72 byteString = unescape(dataURI.split(',')[1]);
73
74 // separate out the mime component
75 var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
76
77 // write the bytes of the string to a typed array
78 var ia = new Uint8Array(byteString.length);
79 for (var i = 0; i < byteString.length; i++) {
80 ia = byteString.charCodeAt(i);
81 }
82
83 return new Blob([ia], {type:mimeString});
84 }
85
86 timer = setInterval(
87 function () {
88 ctx.drawImage(video, 0, 0, 320, 240);
89 var data = canvas.toDataURL('image/jpeg', 1.0);
90 newblob = dataURItoBlob(data);
91 ws.send(newblob);
92 }, 250);
93 </script>
94 </body>
95
96 </html>
facedetect.html 然后是服务器端代码（jetty, websocket, javacv），主要实现：
- 接收客户传送的视频帧数据；
- 使用JavaCV实现人脸检测；
- 在原始图像上绘制检测结果，将新图像返回给客户
1 package com.husthzy.face;
2
3 import org.eclipse.jetty.server.Server;
4
5 public class WebsocketServer extends Thread {
6 @Override
7 public void run() {
8 super.run();
9
10 try {
11 Server server = new Server(2014);
12 server.setHandler(new FaceDetectionHandler());
13 server.setStopTimeout(0);
14 server.start();
15 server.join();
16 } catch (Exception e) {
17 e.printStackTrace();
18 }
19 }
20
21 public static void main(String[] args) {
22 WebsocketServer mWebSocketServer = new WebsocketServer();
23 mWebSocketServer.start();
24 }
25 }
WebsocketServer.java
1 package com.husthzy.face;
2
3 import static org.bytedeco.javacpp.opencv_core.CV_8UC1;
4 import static org.bytedeco.javacpp.opencv_imgcodecs.cvDecodeImage;
5 import static org.bytedeco.javacpp.opencv_imgproc.COLOR_BGRA2GRAY;
6 import static org.bytedeco.javacpp.opencv_imgproc.cvtColor;
7 import static org.bytedeco.javacpp.opencv_imgproc.equalizeHist;
8 import static org.bytedeco.javacpp.opencv_imgproc.rectangle;
9
10 import java.awt.image.BufferedImage;
11 import java.io.ByteArrayOutputStream;
12 import java.io.IOException;
13 import java.nio.ByteBuffer;
14 import java.util.ArrayList;
15
16 import javax.imageio.ImageIO;
17
18 import org.bytedeco.javacpp.BytePointer;
19 import org.bytedeco.javacpp.opencv_core;
20 import org.bytedeco.javacpp.opencv_core.IplImage;
21 import org.bytedeco.javacpp.opencv_core.Mat;
22 import org.bytedeco.javacpp.opencv_core.Rect;
23 import org.bytedeco.javacpp.opencv_core.RectVector;
24 import org.bytedeco.javacpp.opencv_core.Scalar;
25 import org.bytedeco.javacpp.opencv_objdetect.CascadeClassifier;
26 import org.bytedeco.javacv.Frame;
27 import org.bytedeco.javacv.Java2DFrameConverter;
28 import org.bytedeco.javacv.OpenCVFrameConverter.ToMat;
29 import org.eclipse.jetty.websocket.api.Session;
30 import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
31 import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
32 import org.eclipse.jetty.websocket.api.annotations.OnWebSocketError;
33 import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
34 import org.eclipse.jetty.websocket.api.annotations.WebSocket;
35 import org.eclipse.jetty.websocket.server.WebSocketHandler;
36 import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;
37
38 @WebSocket
39 public class FaceDetectionHandler extends WebSocketHandler {
40
41 private static final String CASCADE_FILE = "haarcascade_frontalface_alt.xml";
42
43 private Session mSession;
44 private static ArrayList<FaceDetectionHandler> sessions = new ArrayList<FaceDetectionHandler>();
45
46 private CascadeClassifier face_cascade = new CascadeClassifier(CASCADE_FILE);
47
48 public static ArrayList<FaceDetectionHandler> getAllSessions() {
49 return sessions;
50 }
51
52 @Override
53 public void configure(WebSocketServletFactory factory) {
54 factory.register(FaceDetectionHandler.class);
55 factory.getPolicy().setMaxBinaryMessageSize(1024 * 512);
56 }
57
58 @OnWebSocketClose
59 public void onClose(int statusCode, String reason) {
60 sessions.remove(this);
61 System.out.println(
62 "Close: statusCode = " + statusCode + ", reason = " + reason + ", sessions = " + sessions.size());
63 }
64
65 @OnWebSocketError
66 public void onError(Throwable t) {
67 System.out.println("Error: " + t.getMessage());
68 }
69
70 @OnWebSocketConnect
71 public void onConnect(Session session) {
72 mSession = session;
73 sessions.add(this);
74
75 System.out.println("Connect: " + session.getRemoteAddress().getAddress());
76 }
77
78 @OnWebSocketMessage
79 public void onMessage(String message) {
80 System.out.println("Message: " + message);
81 }
82
83 @OnWebSocketMessage
84 public void onBinaryMessage(byte data[], int offset, int length) {
85 System.out.println("Binary Message len:" + length);
86 if (length > 10000) {
87 try {
88 byte[] sdata = process(data);
89 ByteBuffer byteBuffer = ByteBuffer.wrap(sdata);
90 mSession.getRemote().sendBytes(byteBuffer);
91 byteBuffer.clear();
92 } catch (IOException e) {
93 e.printStackTrace();
94 }
95 }
96 }
97
98 public byte[] process(byte data[]) {
99 IplImage originalImage = cvDecodeImage(opencv_core.cvMat(1, data.length, CV_8UC1, new BytePointer(data)));
100
101 Mat videoMat = new Mat(originalImage);
102 Mat videoMatGray = new Mat();
103 // Convert the current frame to grayscale:
104 cvtColor(videoMat, videoMatGray, COLOR_BGRA2GRAY);
105 equalizeHist(videoMatGray, videoMatGray);
106
107 // Point p = new Point();
108 RectVector faces = new RectVector();
109 face_cascade.detectMultiScale(videoMatGray, faces);
110 for (int i = 0; i < faces.size(); i++) {
111 Rect face_i = faces.get(i);
112
113 //Mat face = new Mat(videoMatGray, face_i);
114 // If fisher face recognizer is used, the face need to be
115 // resized.
116 // resize(face, face_resized, new Size(im_width, im_height),
117 // 1.0, 1.0, INTER_CUBIC);
118
119 // Now perform the prediction, see how easy that is:
120 // int prediction = lbphFaceRecognizer.predict(face);
121
122 // And finally write all we've found out to the original image!
123 // First of all draw a green rectangle around the detected face:
124 rectangle(videoMat, face_i, new Scalar(0, 255, 0, 1));
125
126 System.out.println("face pos: x:" + face_i.x() + " y:" + face_i.y());
127
128 // Create the text we will annotate the box with:
129 //String box_text = "Prediction = " + prediction;
130 // Calculate the position for annotated text (make sure we don't
131 // put illegal values in there):
132 //int pos_x = Math.max(face_i.tl().x() - 10, 0);
133 //int pos_y = Math.max(face_i.tl().y() - 10, 0);
134 // And now put it into the image:
135 //putText(videoMat, box_text, new Point(pos_x, pos_y), FONT_HERSHEY_PLAIN, 1.0, new Scalar(0, 255, 0, 2.0));
136 }
137
138 // JavaCVUtil.imShow(videoMat, "test");
139
140 return getMatByteBuffer(videoMat);
141 }
142
143 private byte[] getMatByteBuffer(Mat m) {
144 byte[] result = null;
145 try {
146 ToMat convert = new ToMat();
147 Frame frame = convert.convert(m);
148 Java2DFrameConverter java2dFrameConverter = new Java2DFrameConverter();
149 BufferedImage bufferedImage = java2dFrameConverter.convert(frame);
150 ByteArrayOutputStream out = new ByteArrayOutputStream();
151 ImageIO.write(bufferedImage, "png", out);
152 result = out.toByteArray();
153 out.close();
154 } catch (IOException exception) {
155 exception.printStackTrace();
156 }
157 return result;
158 }
159 }
FaceDetectionhandler.java |
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