如何使用ZXing获取二维码的坐标？

Question

我可以使用ZXing库获取二维码的值，但我还需要二维码角点的坐标。我怎么才能访问这些坐标。

Answer 1

我不知道你想要提取哪个角坐标。但我确信您可以从Result.getResultPoints()方法获得的结果点计算出它们。

示例:具有以下图像(200x200像素)和代码片段

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BufferedImage image = ImageIO.read(new File("QRCode-1.png"));
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
        new BufferedImageLuminanceSource(image)));
Reader reader = new QRCodeReader();
Result result = reader.decode(binaryBitmap);
System.out.println("text: " + result.getText());
ResultPoint[] resultPoints = result.getResultPoints();
System.out.println("resultPoints:");
for (int i = 0; i < resultPoints.length; i++) {
    ResultPoint resultPoint = resultPoints[i];
    System.out.print("  [" + i + "]:");
    System.out.print(" x = " + resultPoint.getX());
    System.out.print(", y = " + resultPoint.getY());
    if (resultPoint instanceof FinderPattern)
        System.out.print(", estimatedModuleSize = "
                + ((FinderPattern) resultPoint).getEstimatedModuleSize());
    System.out.println();
}

我得到以下输出：

text: Hello World!
resultPoints:
  [0]: x = 36.5, y = 162.5, estimatedModuleSize = 9.0
  [1]: x = 36.5, y = 36.5, estimatedModuleSize = 9.0
  [2]: x = 162.5, y = 36.5, estimatedModuleSize = 9.0

x和y是正方形取景器图案的中心坐标。知道QRCode finder patterns有7x7模块的大小，您可以很容易地计算角坐标。