1.环境搭建：见上一篇博客
整个项目的结构图：
2.编写DetectFaceDemo.java,代码如下：package com.njupt.zhb.test;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.highgui.Highgui;import org.opencv.objdetect.CascadeClassifier;//// Detects faces in an image, draws boxes around them, and writes the results// to "faceDetection.png".//public class DetectFaceDemo { public void run() {System.out.println("\nRunning DetectFaceDemo");System.out.println(getClass().getResource("lbpcascade_frontalface.xml").getPath());// Create a face detector from the cascade file in the resources// directory.//CascadeClassifier faceDetector = new CascadeClassifier(getClass().getResource("lbpcascade_frontalface.xml").getPath());//Mat image = Highgui.imread(getClass().getResource("lena.png").getPath());//注意：源程序的路径会多打印一个‘/’，，因此总是出现如下错误/* * Detected 0 faces Writing faceDetection.png libpng warning: Image * width is zero in IHDR libpng warning: Image height is zero in IHDR * libpng error: Invalid IHDR data *///因此，我们将第一个字符去掉String xmlfilePath=getClass().getResource("lbpcascade_frontalface.xml").getPath().substring(1);CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);Mat image = Highgui.imread(getClass().getResource("we.jpg").getPath().substring(1));// Detect faces in the image.// MatOfRect is a special container class for Rect.MatOfRect faceDetections = new MatOfRect();faceDetector.detectMultiScale(image, faceDetections);System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));// Draw a bounding box around each face.for (Rect rect : faceDetections.toArray()) {Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));}// Save the visualized detection.String filename = "faceDetection.png";System.out.println(String.format("Writing %s", filename));Highgui.imwrite(filename, image); }}3.编写测试类：package com.njupt.zhb.test;public class TestMain { public static void main(String[] args) {System.out.println("Hello, OpenCV");// Load the native library.System.loadLibrary("opencv_java246");new DetectFaceDemo().run(); }}//运行结果://Hello, OpenCV////Running DetectFaceDemo///E:/eclipse_Jee/workspace/JavaOpenCV246/bin/com/njupt/zhb/test/lbpcascade_frontalface.xml//Detected 8 faces//Writing faceDetection.png运行结果：
源码下载：
未经允许，不得用于商业目的
怠惰是贫穷的制造厂。
