一、简介
JavaCV使用来自计算机视觉领域(OpenCV, FFmpeg, libdc1394, PGR FlyCapture, OpenKinect, librealsense, CL PS3 Eye Driver, videoInput, ARToolKitPlus, flandmark, Leptonica, and Tesseract)领域的研究人员常用库的JavaCPP预设的封装。提供实用程序类,使其功能更易于在Java平台上使用,包括Android。
二、案例1:调用摄像头
(1)使用Eclipse新建Maven项目,然后在pom.xml中引入下列依赖(因为要用到opencv来实现,所以需要引入opencv-platform包,此包会自动引入各大平台的依赖jar(内含dll)):
<!-- https://mvnrepository.com/artifact/org.bytedeco/javacv-platform -->
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv-platform</artifactId>
<version>1.4.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.bytedeco.javacpp-presets/opencv-platform -->
<dependency>
<groupId>org.bytedeco.javacpp-presets</groupId>
<artifactId>opencv-platform</artifactId>
<version>3.4.1-1.4.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
package jdbcutil;
import javax.imageio.ImageIO;
import javax.swing.WindowConstants;
import org.bytedeco.javacv.CanvasFrame;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.FrameGrabber;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.bytedeco.javacv.OpenCVFrameGrabber;
import org.junit.Test;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class JavaCV {
public BufferedImage FrameToBufferedImage(Frame frame) {
// 创建BufferedImage对象
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage bufferedImage = converter.getBufferedImage(frame);
return bufferedImage;
}
@Test
public void testCamera() throws InterruptedException, org.bytedeco.javacv.FrameGrabber.Exception{
OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start(); //开始获取摄像头数据
CanvasFrame canvas = new CanvasFrame("摄像头窗口");//新建一个窗口
canvas.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
canvas.setAlwaysOnTop(true);
while (true) {
if (!canvas.isDisplayable()) {//窗口是否关闭
grabber.stop();//停止抓取
System.exit(-1);//退出
}
Frame frame = grabber.grab();
canvas.showImage(frame); //获取摄像头图像并放到窗口上显示, 这里的Frame frame=grabber.grab(); frame是一帧视频图像
Thread.sleep(50); //50毫秒刷新一次图像
}
}
@Test
public void testCamera1() throws Exception {
OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start(); //开始获取摄像头数据
CanvasFrame canvas = new CanvasFrame("摄像头窗口");//新建一个窗口
canvas.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
canvas.setAlwaysOnTop(true);
while (true) {
if (!canvas.isDisplayable()) {//窗口是否关闭
grabber.stop();//停止抓取
System.exit(-1);//退出
}
Frame frame = grabber.grab();
try {
BufferedImage bufferedImage = null;
bufferedImage = FrameToBufferedImage(frame);
LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
Map<DecodeHintType,Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
Result result = new MultiFormatReader().decode(binaryBitmap, hints);//解码
System.out.println("图片中内容: ");
System.out.println("content: " + result.getText());
System.out.println(result.getText());
} catch (Exception e) {
System.out.println("ERROR");
}
canvas.showImage(frame); //获取摄像头图像并放到窗口上显示, 这里的Frame frame=grabber.grab(); frame是一帧视频图像
Thread.sleep(50); //50毫秒刷新一次图像
}
}
}