效果展示
原照片
识别后照片
; 实现过程
Demo开发编译环境
- IDE：Eclipse
- JDK：1.8
- OpenCV：2.4.6
Eclipse配置OpenCV环境
查看我的另外一篇博文：《Java如何引入OpenCV包》。
人脸识别Demo代码
package main;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
public class OpenCVTest {
public static void main(String[] args) {
System.out.println("face detector application.");
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
new DetectFaceDemo().run();
}
}
class DetectFaceDemo {
public void run() {
System.out.println("detectFace application is running ...");
CascadeClassifier faceDetector = new CascadeClassifier(
System.getProperty("user.dir") + "/resources/lbpcascade_frontalface.xml");
Mat imread = Imgcodecs.imread(System.getProperty("user.dir") + "/resources/3.jpg");
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(imread, faceDetections);
System.out.println(String.format("Detected %s face", faceDetections.toArray().length));
for (Rect rect : faceDetections.toArray()) {
Imgproc.rectangle(imread, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
new Scalar(0, 255, 0));
}
String fileName = "faceDetection.png";
System.out.println(String.format("Writing %s", fileName));
Imgcodecs.imwrite(fileName, imread);
}
}
注意事项
上面代码中需要注意的是 lbpcascade_frontalface.xml文件，它的位置在opencv安装目录里，例如我将opencv解压到C盘下的env目录，那么该文件可在下面的路径中找到
C:\env\opencv\opencv\sources\data\lbpcascades
上面的文件路径问题也需要注意，如果路径没有指定到对应文件可能会报如下的错误：
Exception in thread "main" CvException [org.opencv.core.CvException: cv::Exception: OpenCV(4.5.4) C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'
]
at org.opencv.objdetect.CascadeClassifier.detectMultiScale_5(Native Method)
at org.opencv.objdetect.CascadeClassifier.detectMultiScale(CascadeClassifier.java:255)
at main.DetectFaceDemo.run(OpenCVTest.java:33)
at main.OpenCVTest.main(OpenCVTest.java:18)
出现上述错误大概率是文件路径没有指定对，我这里的文件目录结构如下：
Original: https://www.cnblogs.com/hhl1011/p/16478910.html
Author: 胡海龙
Title: 使用Java+OpenCV实现照片人脸识别Demo
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