Unable to read the barcode from the image

[rgolivi]

Hi Team,

I'm unable to read the barcode data from the image using the Zxing barcodeReader.Decode() method. Below is the code snippet for the same and also attached the barcode image:

var barcodeReader = new BarcodeReader() { TryInverted=true};

       barcodeReader.Options.TryHarder = true;
 
        var barcodeData = (Bitmap)Bitmap.FromFile(@"C:\Patch-T-NextIsNewDoc.jpg");
        var result = barcodeReader.Decode(barcodeData );

[micjahn]

What kind of barcode and which content did you expect?

[virtualvoid]

i'm having the same trouble (with attached image) using this code:

` using (var bitmap = new MagickImage(fileName)) { var reader = new BarcodeReader(); reader.AutoRotate = true; reader.TryInverted = true; reader.Options.TryHarder = true; reader.Options.PossibleFormats = new List<ZXing.BarcodeFormat>(); reader.Options.PossibleFormats.Add(ZXing.BarcodeFormat.QR_CODE);

    var x = reader.DecodeMultiple(bitmap);

`

.net5

the x is always null, tried everything

[micjahn]

In your case the image resolution is too high. The heuristical approach recognizes too many white pixels in the black areas I think. If you reduce the size by 50 percent or more it can be decoded.

[The-Duc]

This appears to have been my issue (in C#) with a rather large Code 39. Are there any guidelines for a maximum (or minimum) resolution to use?

[bigcat-2016]

i'm having the same trouble (with attached image) using this code:

` using (var bitmap = new MagickImage(fileName)) { var reader = new BarcodeReader(); reader.AutoRotate = true; reader.TryInverted = true; reader.Options.TryHarder = true; reader.Options.PossibleFormats = new List<ZXing.BarcodeFormat>(); reader.Options.PossibleFormats.Add(ZXing.BarcodeFormat.QR_CODE);

    var x = reader.DecodeMultiple(bitmap);

`

.net5

the x is always null, tried everything

The problem of the image resolution makes it impossible to recognize the content of the QR code. You can try the following methods:

          var image = Image.FromFile(imgPath);
            LuminanceSource source = null;
            if (image.PixelFormat == PixelFormat.Format32bppArgb)
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height, RGBLuminanceSource.BitmapFormat.RGB32);
            }
            else if (image.PixelFormat == PixelFormat.Format24bppRgb)
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height, RGBLuminanceSource.BitmapFormat.RGB24);
            }
            else
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height);
            }
            var binarizer = new HybridBinarizer(source);
            var binBitmap = new BinaryBitmap(binarizer);
            QRCodeReader reader = new QRCodeReader();
            var result = reader.decode(binBitmap);
            return result == null ? string.Empty : result.Text;

[bigcat-2016]

You can perform different processing according to different picture resolutions：

           var image = Image.FromFile(imgPath);
            LuminanceSource source = null;
            if (image.PixelFormat == PixelFormat.Format32bppArgb)
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height, RGBLuminanceSource.BitmapFormat.RGB32);
            }
            else if (image.PixelFormat == PixelFormat.Format24bppRgb)
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height, RGBLuminanceSource.BitmapFormat.RGB24);
            }
            else
            {
                source = new RGBLuminanceSource(ToByteArray(image), image.Width, image.Height);
            }
            var binarizer = new HybridBinarizer(source);
            var binBitmap = new BinaryBitmap(binarizer);

            QRCodeReader reader = new QRCodeReader();
            var result = reader.decode(binBitmap);
            return result == null ? string.Empty : result.Text;