使用zxing二维码识别

2019-02-25 16:10:52来源：博客园阅读 ()

1.多二维码识别 (同一张图片中多二维码识别)

　　直接上代码舒服：

pom文件：

1         <!-- QR Code -->
2         <dependency>
3             <groupId>com.google.zxing</groupId>
4             <artifactId>core</artifactId>
5             <version>3.3.3</version>
6         </dependency>、

 1    /**
 2      * Parse multiple qr codes(解析多个二维码)
 3      *  使用java实现
 4      *
 5      * @param bufferedImage image
 6      * @return QRCode analysis results
 7      */
 8     @Override
 9     public Result[] analysisQRCodeOfMore(BufferedImage bufferedImage) {
10         QRCodeMultiReader qrCodeMultiReader = new QRCodeMultiReader();
11         Result[] results = null;
12         try {
13             BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(bufferedImage)));
14             Map hints = new Hashtable();
15             hints.put(EncodeHintType.CHARACTER_SET, SystemConstants.SYS_ENC);
16             hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);   //优化精度
17             hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE); //复杂模式，开启PURE_BARCODE模式； 带图片LOGO的解码方案
18             hints.put(DecodeHintType.POSSIBLE_FORMATS,BarcodeFormat.QR_CODE);//指定识别的二维码格式
19             results = qrCodeMultiReader.decodeMultiple(binaryBitmap, hints);
20         } catch (NotFoundException e) {
21             //e.printStackTrace();
22             System.err.println("二维码识别中...");
23         }
24         return results;
25     }

注意：开启精度优化与复杂模式会消耗识别时间！

在多二维码识别中，应该说是zxing的一个小bug，在识别过程中对于模糊一点的图片，会一直抛异常 (二维码识别中...) 直至二维码识别不出来，或者二维码识别出来；此问题没来得及细细研究，等日后补充；

2.单二维码识别：

 1     private String decodeQRCode(Mat src) {
 2         if (src == null) {
 3             return null;
 4         }
 5         BufferedImage image;
 6         try {
 7             image = ImageUtils.mat2BufferedImage(src, ".jpg");
 8             LuminanceSource source = new BufferedImageLuminanceSource(image);
 9             Binarizer binarizer = new HybridBinarizer(source);
10             BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
11             Map<DecodeHintType, Object> hints = new HashMap<>();
12             hints.put(DecodeHintType.CHARACTER_SET, SystemConstants.SYS_ENC);
13             hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
14             Result resultText = new MultiFormatReader().decode(binaryBitmap, hints);
15             return resultText.getText();
16         } catch (NotFoundException e) {
17             LogUtils.info("[QRCodeServiceImpl] decodeQRCode image transform failed.");
18         }
19         return null;
20     }

以上代码使用opencv格式的图片来转换为BufferedImage为需要的入参；

3. (扩展) 多二维码识别与多二维码识别不同点：

1  public Result[] decodeMultiple(BinaryBitmap image, Map<DecodeHintType,?> hints)

单二维码识别函数：

1 public Result decode(BinaryBitmap image, Map<DecodeHintType,?> hints)

完毕！

private String decodeQRCode(Mat src) {
    if (src == null) {
        return null;
}
    BufferedImage image;
    try {
        image = ImageUtils.mat2BufferedImage(src, ".jpg");
LuminanceSource source = new BufferedImageLuminanceSource(image);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
Map<DecodeHintType, Object> hints = new HashMap<>();
hints.put(DecodeHintType.CHARACTER_SET, SystemConstants.SYS_ENC);
hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
Result resultText = new MultiFormatReader().decode(binaryBitmap, hints);
        return resultText.getText();
} catch (NotFoundException e) {
        LogUtils.info("[QRCodeServiceImpl] decodeQRCode image transform failed.");
}
    return null;
}