c# - 用zxing.net扫描多个条码

Question

我的目标是在这样的更大图像（四个大图像）上检测多个数据矩阵：

根据几个代码示例，我做了一个小测试程序：

Bitmap image = getImage();

DataMatrixReader reader = new DataMatrixReader();
GenericMultipleBarcodeReader genericReader = new genericMultipleBarcodeReader(reader);
Dictionary<DecodeHintType, object> hints = new Dictionary<DecodeHintType,object>();
hints.Add(DecodeHintType.TRY_HARDER, true);

BitmapLuminanceSource source = new BitmapLuminanceSource(image);
HybridBinarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
Result[] results = genericReader.decodeMultiple(binaryBitmap,hints);

show(results);

它无法检测到大图像上的任何代码。

但它可以检测到代码，当它像这样裁剪时：

之后我合并了两个生成的数据矩阵，它也失败了：

最后，我用略微裁剪的图像再进行了两次测试，都失败了：

所以看起来这个库根本不健壮，或者我用错了。

知道如何改善我的结果吗？（包括其他库和预处理）

Answer 1

It can't be said that the library is not robust but there are two key factors affecting you here:

• Zxing's data-matrix detection algorithm assumes that the barcode is centered. Or more precisely, that the center of the image is inside the data-matrix.
• Zxing's multiple reader specially fails when barcodes are grid-aligned.

My recommendation is to implement your own MultipleBarcodeReader taking into account what I've mentioned.

A naive approach could be to take sample images centered over a grid of points spaced so every data-matrix (no matter its position within the image) contain at least one of the points inside. You just have to make sure to exclude duplicated codes.