java 在图像中查找二维码并使用 Zxing 对其进行解码
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时间：2020-11-03 01:04:37 来源:igfitidea点击:
Find QR code in image and decode it using Zxing
提问by Tim
First of all, I read through all those topics how to use Zxing in Java but always got errors with missing com.google.zxing.client.j2se.* (I loaded the zxing core-3.2.1.jar in eclipse and all other zxing packages work unless j2se) or just found solutions for creating qr images...
首先，我通读了如何在 Java 中使用 Zxing 的所有主题，但总是出现缺少 com.google.zxing.client.j2se.* 的错误（我在 eclipse 和所有其他zxing 包工作，除非 j2se) 或刚刚找到创建 qr 图像的解决方案...
My aim is to write one single method which gets an image file finds the qr code in this image, decodes the qr code and returns the string, basically it should be something like the following:
我的目标是编写一个获取图像文件的方法，在这个图像中找到二维码，解码二维码并返回字符串，基本上它应该是这样的：
import com.google.zxing.*;
public class QRCode {
/*
* ...
*/
public String getDecodedString(SomeStandardImageType photo){
// detect the qr code in a photo
// create qr image from detected area in photo
// decode the new created qr image and return the string
return "This is the decoded dataString from the qr code in the photo";
}
}
To sum up the method should get an image file like the following
综上所述方法应该得到如下图的图片文件
and should return the url or if failed just "".
并且应该返回 url 或者如果失败只是“”。
The code should be compatible with Zxing 3.2.1.
该代码应与 Zxing 3.2.1 兼容。
Edit:The question is solved. For others who are interested in this I want to say that it is important to add both external jars core-3.2.1.jarandjavase-3.2.1.jarto external jars. The answer by me works without the latter but depends on android image libs.
编辑：问题已解决。对于对此感兴趣的其他人，我想说添加外部 jarcore-3.2.1.jar和javase-3.2.1.jar外部 jar很重要。我的答案在没有后者的情况下有效，但取决于 android 图像库。
采纳答案by Sandip Bhoi
here is the code to create the Qr-Code and read Message from Qr-code
这是创建二维码并从二维码读取消息的代码
you need the build the zxing library
main describe the qr-code creation and qr-code extraction
package com.attendance.mark; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.BinaryBitmap; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatReader; import com.google.zxing.MultiFormatWriter; import com.google.zxing.NotFoundException; import com.google.zxing.Result; import com.google.zxing.WriterException; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.client.j2se.MatrixToImageWriter; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; public class QRCode { /** * * @param args * @throws WriterException * @throws IOException * @throws NotFoundException */ public static void main(String[] args) throws WriterException, IOException, NotFoundException { String qrCodeData = "student3232_2015_12_15_10_29_46_123"; String filePath = "F:\Opulent_ProjectsDirectory_2015-2016\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\AttendanceUsingQRCode\QRCodes\student3232_2015_12_15_10_29_46_123"; String charset = "UTF-8"; // or "ISO-8859-1" Map<EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>(); hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); createQRCode(qrCodeData, filePath, charset, hintMap, 200, 200); System.out.println("QR Code image created successfully!"); System.out.println("Data read from QR Code: " + readQRCode(filePath, charset, hintMap)); } /*** * * @param qrCodeData * @param filePath * @param charset * @param hintMap * @param qrCodeheight * @param qrCodewidth * @throws WriterException * @throws IOException */ public static void createQRCode(String qrCodeData, String filePath, String charset, Map hintMap, int qrCodeheight, int qrCodewidth) throws WriterException, IOException { BitMatrix matrix = new MultiFormatWriter().encode( new String(qrCodeData.getBytes(charset), charset), BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight); MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath .lastIndexOf('.') + 1), new File(filePath)); } /** * * @param filePath * @param charset * @param hintMap * * @return Qr Code value * * @throws FileNotFoundException * @throws IOException * @throws NotFoundException */ public static String readQRCode(String filePath, String charset, Map hintMap) throws FileNotFoundException, IOException, NotFoundException { BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer( new BufferedImageLuminanceSource( ImageIO.read(new FileInputStream(filePath))))); Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap); return qrCodeResult.getText(); } }
您需要构建 zxing 库
主要描述二维码创建和二维码提取
package com.attendance.mark; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.BinaryBitmap; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatReader; import com.google.zxing.MultiFormatWriter; import com.google.zxing.NotFoundException; import com.google.zxing.Result; import com.google.zxing.WriterException; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.client.j2se.MatrixToImageWriter; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; public class QRCode { /** * * @param args * @throws WriterException * @throws IOException * @throws NotFoundException */ public static void main(String[] args) throws WriterException, IOException, NotFoundException { String qrCodeData = "student3232_2015_12_15_10_29_46_123"; String filePath = "F:\Opulent_ProjectsDirectory_2015-2016\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\AttendanceUsingQRCode\QRCodes\student3232_2015_12_15_10_29_46_123"; String charset = "UTF-8"; // or "ISO-8859-1" Map<EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>(); hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); createQRCode(qrCodeData, filePath, charset, hintMap, 200, 200); System.out.println("QR Code image created successfully!"); System.out.println("Data read from QR Code: " + readQRCode(filePath, charset, hintMap)); } /*** * * @param qrCodeData * @param filePath * @param charset * @param hintMap * @param qrCodeheight * @param qrCodewidth * @throws WriterException * @throws IOException */ public static void createQRCode(String qrCodeData, String filePath, String charset, Map hintMap, int qrCodeheight, int qrCodewidth) throws WriterException, IOException { BitMatrix matrix = new MultiFormatWriter().encode( new String(qrCodeData.getBytes(charset), charset), BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight); MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath .lastIndexOf('.') + 1), new File(filePath)); } /** * * @param filePath * @param charset * @param hintMap * * @return Qr Code value * * @throws FileNotFoundException * @throws IOException * @throws NotFoundException */ public static String readQRCode(String filePath, String charset, Map hintMap) throws FileNotFoundException, IOException, NotFoundException { BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer( new BufferedImageLuminanceSource( ImageIO.read(new FileInputStream(filePath))))); Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap); return qrCodeResult.getText(); } }
回答by Tim
I now read deeper into Zxing and the following code will work with Zxing v3.2.1 (This code works without javaselib)
我现在更深入地阅读 Zxing，以下代码将适用于 Zxing v3.2.1（此代码无需javaselib 即可工作）
// Imports
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.FormatException;
import com.google.zxing.LuminanceSource;
import com.google.zxing.NotFoundException;
import com.google.zxing.RGBLuminanceSource;
import com.google.zxing.Reader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
// Interesting method
public static String decodeQRImage(String path) {
Bitmap bMap = BitmapFactory.decodeFile(path);
String decoded = null;
int[] intArray = new int[bMap.getWidth() * bMap.getHeight()];
bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(),
bMap.getHeight());
LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(),
bMap.getHeight(), intArray);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Reader reader = new QRCodeReader();
try {
Result result = reader.decode(bitmap);
decoded = result.getText();
} catch (NotFoundException e) {
e.printStackTrace();
} catch (ChecksumException e) {
e.printStackTrace();
} catch (FormatException e) {
e.printStackTrace();
}
return decoded;
}
回答by Danish Ahmad
This code works fine for me. Hope it helps just import the necessary packages and it should work
这段代码对我来说很好用。希望它有助于导入必要的包，它应该可以工作
public class QR_Reader extends JFrame implements Runnable, ThreadFactory {
private static final long serialVersionUID = 6441489157408381878L;
private Executor executor = Executors.newSingleThreadExecutor(this);
private Webcam webcam = null;
private WebcamPanel panel = null;
String s;
public QR_Reader() {
super();
setLayout(new FlowLayout());
setTitle("Reading QR Code");
Dimension size = WebcamResolution.QVGA.getSize();
webcam = Webcam.getWebcams().get(0);
webcam.setViewSize(size);
panel = new WebcamPanel(webcam);
panel.setPreferredSize(size);
add(panel);
pack();
setVisible(true);
setResizable(false);
executor.execute(this);
}
@Override
public void run() {
do {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
Result result = null;
BufferedImage image = null;
if (webcam.isOpen()) {
if ((image = webcam.getImage()) == null) {
continue;
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
result = new MultiFormatReader().decode(bitmap);
} catch (NotFoundException e) {
// fall thru, it means there is no QR code in image
}
}
if (result != null) {
String time_then=result.getText(); //this is the text extracted from QR CODE
webcam.close();
this.setVisible(false);
this.dispose();
try {
new Compare().C_Main(time_then);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} while (true);
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r, "example-runner");
t.setDaemon(true);
return t;
}
void QRC_Main() {
new QR_Reader();
}
}
