C# 使用ZXING.NET解码真实图像中的QRCODE

Question

我正在尝试读取 USB 相机获取的图像中的二维码。 在其他帖子中，我读到最好的开源库是 ZXing。

如果二维码来自数字生成的图像，则库工作正常，但如果二维码来自图像由相机获取的真实情况，则解码库会遇到一些困难。

采集的图像受到一些眩光、代码变形或对比度缓慢的干扰。

您知道一些参数可以更好地设置阅读器吗？ 或者在阐述之前添加一些滤镜到图像中？

例如：

BarcodeReader reader = new BarcodeReader();

reader.AutoRotate = true;
reader.Options.TryHarder = true;
reader.Options.PureBarcode = false;
reader.Options.PossibleFormats = new List<BarcodeFormat>();
reader.Options.PossibleFormats.Add(BarcodeFormat.QR_CODE);

var result = reader.Decode(image);

谢谢你

Answer 1

经过多次测试，300dpi扫描图像的最佳结果是：

//use gaussian filter to remove noise
var gFilter = new GaussianBlur(2);
image = gFilter.ProcessImage(image);
                   
var options = new DecodingOptions { PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.QR_CODE }, TryHarder = true };
    
using (image)
{
    //use GlobalHistogramBinarizer for best result
    var reader = new BarcodeReader(null, null, ls => new GlobalHistogramBinarizer(ls)) { AutoRotate = false, TryInverted = false, Options = options };
    var result = reader.Decode(image);
    reader = null;
                    
   return result;
}

对于高斯滤波器，我使用来自 http://www.cnblogs.com/Dah/archive/2007/03/30/694527.html

的代码

希望这对某人有帮助。

Answer 2

This is how I solve it  
First you need to install one of the packages from (ZXing.Net.Bindings.*)  
First example using
> ZXing.Net.Bindings.Windows.Compatibility  
Please note this package only works on Windows.

    using ZXing;
    using ZXing.Common;
    using ZXing.QrCode;
    using ZXing.Windows.Compatibility;
    public static string ReadQRCode(byte[] byteArray)
    {
        Bitmap target;
        target = ByteToBitmap(byteArray);
        var source = new BitmapLuminanceSource(target);
        var bitmap = new BinaryBitmap(new HybridBinarizer(source));
        var reader = new QRCodeReader();
        var result = reader.decode(bitmap);
        return result.Text;
    }
    
    public static Bitmap ByteToBitmap(byte[] byteArray) 
    {
        Bitmap target;
        using (var stream = new MemoryStream(byteArray)) {
             target = new Bitmap(stream);
        }
    
         return target;
    }
Second example using  
> ZXing.Net.Bindings.ImageSharp.V2

    using ZXing;
    using ZXing.Common;
    using ZXing.ImageSharp;
    using ZXing.QrCode;
        public static string ReadQRCode(byte[] byteArray) 
        {
            // Load image from byte array
            Image<Rgba32> image = SixLabors.ImageSharp.Image.Load<Rgba32>(byteArray);
            // Create an instance of ImageSharpLuminanceSource with Rgba32 pixel format
            var luminanceSource = new ImageSharpLuminanceSource<Rgba32>(image);
    
            var bitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));
            var reader = new QRCodeReader();
            var result = reader.decode(bitmap);
            return result. Text;
        }