我有一个带有二维条形码的jpeg文件。图像分辨率为1593X1212。我正在使用xing库从图像中解码这个条形码。我在网上得到了以下代码。
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.FormatException;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Reader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
public class NewLibTest {
public static void main(String args[]){
System.out.println(decode(new File("E:\\xyz.jpg")));
}
/**
* Decode method used to read image or barcode itself, and recognize the barcode,
* get the encoded contents and returns it.
* @param <DecodeHintType>
* @param file image that need to be read.
* @param config configuration used when reading the barcode.
* @return decoded results from barcode.
*/
public static String decode(File file){//, Map<DecodeHintType, Object> hints) throws Exception {
// check the required parameters
if (file == null || file.getName().trim().isEmpty())
throw new IllegalArgumentException("File not found, or invalid file name.");
BufferedImage image = null;
try {
image = ImageIO.read(file);
} catch (IOException ioe) {
try {
throw new Exception(ioe.getMessage());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (image == null)
throw new IllegalArgumentException("Could not decode image.");
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
MultiFormatReader barcodeReader = new MultiFormatReader();
Result result;
String finalResult = null;
try {
//if (hints != null && ! hints.isEmpty())
// result = barcodeReader.decode(bitmap, hints);
//else
result = barcodeReader.decode(bitmap);
// setting results.
finalResult = String.valueOf(result.getText());
} catch (Exception e) {
e.printStackTrace();
// throw new BarcodeEngine().new BarcodeEngineException(e.getMessage());
}
return finalResult;
}
}
当我执行这个简单的核心java程序时，我给出了异常
com.google.zxing.NotFoundException
它甚至没有给任何stackstrace。
我想问专家，为什么会出现这种异常。 谢谢你！
答案 0 :(得分：8)
我遇到了同样的问题。我使用了一张我认识的有效QR码的图片，而且我还得到了com.google.zxing.NotFoundException。
问题是您用作源的图像对于要解码的库来说很大。在缩小图像尺寸后，QR码解码器工作。
出于我的应用目的，图像上的QR码总是或多或少在同一区域，因此我使用BufferedImage类的getSubimage函数来隔离QR码。
BufferedImage image;
image = ImageIO.read(imageFile);
BufferedImage cropedImage = image.getSubimage(0, 0, 914, 400);
// using the cropedImage instead of image
LuminanceSource source = new BufferedImageLuminanceSource(cropedImage);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
// barcode decoding
QRCodeReader reader = new QRCodeReader();
Result result = null;
try
{
result = reader.decode(bitmap);
}
catch (ReaderException e)
{
return "reader error";
}
答案 1 :(得分：6)
我遇到了同样的问题。当我在Java SE库上运行几乎完全相同的代码时，它可以工作。当我使用相同的图片运行Android代码时，它无法正常工作。花了很多时间试图找出......
您可以使用
缩放位图 Bitmap resize = Bitmap.createScaledBitmap(srcBitmap, dstWidth,dstHeight,false);
问题：你必须打开一些标志。玩弄几乎所有的旗帜，这个解决方案对我有用：
Map<DecodeHintType, Object> tmpHintsMap = new EnumMap<DecodeHintType, Object>(
DecodeHintType.class);
tmpHintsMap.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
tmpHintsMap.put(DecodeHintType.POSSIBLE_FORMATS,
EnumSet.allOf(BarcodeFormat.class));
tmpHintsMap.put(DecodeHintType.PURE_BARCODE, Boolean.FALSE);
...
MultiFormatReader mfr = null;
mfr = new MultiFormatReader();
result = mfr.decode(binaryBitmap, tmpHintsMap);
问题：ZXing的Android库运行一次条形码扫描，假设图片上的条形码已经有正确的方向。如果不是这种情况，你必须运行四次，每次将图片旋转90度左右！
对于旋转，您可以使用此方法。角度是以度为单位的角度。
public Bitmap rotateBitmap(Bitmap source, float angle)
{
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
}
答案 2 :(得分：3)
如果图像中未找到条形码，则抛出该异常：
http://zxing.org/w/docs/javadoc/com/google/zxing/NotFoundException.html
答案 3 :(得分：2)
这是正常的;它只是意味着没有找到条形码。您尚未提供图像，因此我无法确定您的图像是否具有可读性，更不用说支持条形码格式了。
答案 4 :(得分：0)
我有同样的问题，我正在调用readQRCode（filePath，charset，hintMap）;并得到了同样的信息。我正在调用我使用zxing库编写的库。要修复它，只需将（zxing）jar添加到顶级代码中，即使没有访问库也是如此。
答案 5 :(得分：0)
如果您使用此代码，
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, tmpHintsMap);
return qrCodeResult.getText();
}
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, tmpHintsMap);
return qrCodeResult.getText();
}
更改此代码。一致的工作，
public static String readQRCode(String filePath, String charset, Map hintMap)
throws FileNotFoundException, IOException, NotFoundException {
Map < DecodeHintType, Object > tmpHintsMap = new EnumMap < DecodeHintType, Object > (
DecodeHintType.class);
//tmpHintsMap.put(DecodeHintType.TRY_HARDER, Boolean.FALSE);
//tmpHintsMap.put(DecodeHintType.POSSIBLE_FORMATS, EnumSet.allOf(BarcodeFormat.class));
tmpHintsMap.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
new BufferedImageLuminanceSource(
ImageIO.read(new FileInputStream(filePath)))));
Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap, tmpHintsMap);
return qrCodeResult.getText();
}
答案 6 :(得分：0)
此解决方案对我有用。希望对您有所帮助。我将reader.decode(...)替换为reader.decodeWithState(...)
MultiFormatReader reader = new MultiFormatReader();// use this otherwise
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
decodeHints.put(DecodeHintType.POSSIBLE_FORMATS, EnumSet.allOf(BarcodeFormat.class));
Result result = reader.decodeWithState(bitmap);
答案 7 :(得分：0)
我已经在ImageAnalysis中调整了目标分辨率，并且开始工作。
来自
ImageAnalysis imageAnalysis =
new ImageAnalysis.Builder()
.setTargetResolution(new Size(mySurfaceView.getWidth(), mySurfaceView.getHeight()))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();
对此
ImageAnalysis imageAnalysis =
new ImageAnalysis.Builder()
.setTargetResolution(new Size(700, 500))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();
答案 8 :(得分：-1)
try {
String a = textField_1.getText(); //my image path
InputStream barCodeInputStream = new FileInputStream(""+a);
BufferedImage barCodeBufferedImage = ImageIO.read(barCodeInputStream);
LuminanceSource source = new BufferedImageLuminanceSource(barCodeBufferedImage);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
MultiFormatReader reader = new MultiFormatReader();
com.google.zxing.Result result = reader.decode(bitmap);
System.out.println("Barcode text is " + result.getText());
textField.setText(""+result.getText());
} catch (Exception e) {
// TODO: handle exception
JOptionPane.showMessageDialog(null, "This image does not contain barcode", "Warning", JOptionPane.WARNING_MESSAGE);
e.printStackTrace();
}