ZXing can not read this QRCode

Question

I have the following code:

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ZXing;

namespace SeparatorPageSplit.framework
{
    class QRCodeScanner
    {
        BarcodeReader reader;
        public QRCodeScanner()
        {
            try
            {
                this.reader = new BarcodeReader { AutoRotate = true, TryInverted = true };
                this.reader = new BarcodeReader();
                this.reader.Options.PossibleFormats = new List<BarcodeFormat>();
                this.reader.Options.PossibleFormats.Add(BarcodeFormat.QR_CODE);
                // this.reader.Options.TryHarder = true;
            }
            catch (Exception ex)
            {
                Program.WriteToLogFile(ex.ToString());
            }
        }
        public Boolean IsQRCodeFound(string ImagePath)
        {
            string decoded = "";
            Bitmap bitmap = new Bitmap(ImagePath);
            try
            {
                Result result = this.reader.Decode(bitmap);
                if (result != null)
                {
                    decoded = result.ToString().Trim();
                }
            }
            catch (Exception ex)
            {
                Program.WriteToLogFile(ex.ToString());
            }
            finally
            {
                bitmap.Dispose();
            }

            if (decoded == "CCA001")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}

And I tried to read the following image:

This code works fine if I scan in color or grayscale. It does not work when I scan in black and white.

Is there some setting in ZXing that will allow this to scan?

Is there a simple way to scrub the small dots?

[EDIT] We are using ZXing.Net v0.16.5 installed from Nuget in Visual Studio. Nuget shows that at the latest version available.

Answer 1

Here is the code that was able to read color, black/white, and grey scale:

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ZXing;

namespace SeparatorPageSplit.framework
{
    class QRCodeScanner
    {
        //BarcodeReader reader;
        QRCodeDecoderLibrary.QRDecoder QRCodeDecoder;

        public QRCodeScanner()
        {
            try
            {
                QRCodeDecoder = new QRCodeDecoderLibrary.QRDecoder();
            }
            catch (Exception ex)
            {
                Program.WriteToLogFile(ex.ToString());
            }
        }
        public Boolean IsQRCodeFound(string ImagePath)
        {
            string decoded = "";
            Bitmap bitmap = new Bitmap(ImagePath);
            try
            {
                byte[][] DataByteArray = QRCodeDecoder.ImageDecoder(bitmap);
                decoded = QRCodeResult(DataByteArray);
            }
            catch (Exception ex)
            {
                Program.WriteToLogFile(ex.ToString());
            }
            finally
            {
                bitmap.Dispose();
            }

            if (decoded == "CCA001")
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// Format result for display
        /// </summary>
        /// <param name="DataByteArray"></param>
        /// <returns></returns>
        private static string QRCodeResult(byte[][] DataByteArray)
        {
            // no QR code
            if (DataByteArray == null) return string.Empty;

            // image has one QR code
            if (DataByteArray.Length == 1) return ForDisplay(QRCodeDecoderLibrary.QRDecoder.ByteArrayToStr(DataByteArray[0]));

            // image has more than one QR code
            StringBuilder Str = new StringBuilder();
            for (int Index = 0; Index < DataByteArray.Length; Index++)
            {
                if (Index != 0) Str.Append("\r\n");
                Str.AppendFormat("QR Code {0}\r\n", Index + 1);
                Str.Append(ForDisplay(QRCodeDecoderLibrary.QRDecoder.ByteArrayToStr(DataByteArray[Index])));
            }
            return Str.ToString();
        }

        private static string ForDisplay(string Result)
        {
            int Index;
            for (Index = 0; Index < Result.Length && (Result[Index] >= ' ' && Result[Index] <= '~' || Result[Index] >= 160); Index++) ;
            if (Index == Result.Length) return Result;

            StringBuilder Display = new StringBuilder(Result.Substring(0, Index));
            for (; Index < Result.Length; Index++)
            {
                char OneChar = Result[Index];
                if (OneChar >= ' ' && OneChar <= '~' || OneChar >= 160)
                {
                    Display.Append(OneChar);
                    continue;
                }

                if (OneChar == '\r')
                {
                    Display.Append("\r\n");
                    if (Index + 1 < Result.Length && Result[Index + 1] == '\n') Index++;
                    continue;
                }

                if (OneChar == '\n')
                {
                    Display.Append("\r\n");
                    continue;
                }

                Display.Append('¿');
            }
            return Display.ToString();
        }
    }
}