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DataMatrix Type Barcode is not Reading the Barcode value from the Image

Hello,

Please find the attached sample image. In this image we have two types of barcode. line Barcode and DataMatrix barcode. In Our code we are using DataMatrix type to read the barcode. Below code is not working for DataMatrix type Barcode.

Dll version 4.2.0.0.

Aspose.BarCode.dll

Aspose.BarCodeRecognition.dll

You can test your DEMO site also with this image.

Kindly help out to resolve this issue as soon.

Thanks in Advance.

Regards,

P. Saravanan.

saravanan.palanisamy@xerox.com

Please reply to my email.

I have attached the sample file for your reference. Please check with this attachemnt image

Source code sample

private void button16_Click(object sender, EventArgs e)

{

Bitmap bitmap = null;

Bitmap newBitmap = null;

MemoryStream byteStream = null;

Aspose.BarCodeRecognition.BarCodeReader reader = null;

List<string> barcodes = new List<string>();

// -- get the image path from the IFO

OpenFileDialog flg = new OpenFileDialog();

flg.Filter = "All files (*.*)|*.*";

flg.InitialDirectory = "E:";

string FullImageName = string.Empty;

if (flg.ShowDialog() == DialogResult.OK)

FullImageName = flg.FileName;

try

{

//Convert to bitonal since color stacks would error or or not read

bitmap = (Bitmap)System.Drawing.Image.FromFile(FullImageName);

newBitmap = ConvertToBitonal(bitmap);

byteStream = new MemoryStream();

newBitmap.Save(byteStream, ImageFormat.Tiff);

// -- read the barcodes

//Aspose.BarCodeRecognition.BarCodeReader reader = new Aspose.BarCodeRecognition.BarCodeReader(FullImageName, Aspose.BarCodeRecognition.BarCodeReadType.Code39Extended);

//reader = new Aspose.BarCodeRecognition.BarCodeReader(byteStream, Aspose.BarCodeRecognition.BarCodeReadType.Code39Extended);

reader = new Aspose.BarCodeRecognition.BarCodeReader(byteStream, Aspose.BarCodeRecognition.BarCodeReadType.DataMatrix);

string bc = string.Empty;

// -- loop the barcodes found

while (reader.Read())

{

bc = reader.GetCodeText().Trim();

MessageBox.Show("Barcode value" + bc.ToString());

// -- we want to check the barcode against the regex

// -- if we don't find a match, throw this barcode away

// -- but only do this logic if they have at least one regex defined

if (bc.Trim() != string.Empty)

barcodes.Add(bc.Trim());

}

}

finally

{

reader.Close();

reader = null;

bitmap = null;

newBitmap = null;

if (byteStream != null)

{

byteStream.Close();

}

byteStream = null;

}

}

#region ConvertToBitonial

public static Bitmap ConvertToBitonal(Bitmap original)

{

Bitmap source = null;

// If original bitmap is not already in 32 BPP, ARGB format, then convert

if (original.PixelFormat != PixelFormat.Format32bppArgb)

{

source = new Bitmap(original.Width, original.Height, PixelFormat.Format32bppArgb);

source.SetResolution(original.HorizontalResolution, original.VerticalResolution);

using (Graphics g = Graphics.FromImage(source))

{

g.DrawImageUnscaled(original, 0, 0);

}

}

else

{

source = original;

}

// Lock source bitmap in memory

BitmapData sourceData = source.LockBits(new System.Drawing.Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);

// Copy image data to binary array

int imageSize = sourceData.Stride * sourceData.Height;

byte[] sourceBuffer = new byte[imageSize];

Marshal.Copy(sourceData.Scan0, sourceBuffer, 0, imageSize);

// Unlock source bitmap

source.UnlockBits(sourceData);

// Create destination bitmap

Bitmap destination = new Bitmap(source.Width, source.Height, PixelFormat.Format1bppIndexed);

// Lock destination bitmap in memory

BitmapData destinationData = destination.LockBits(new System.Drawing.Rectangle(0, 0, destination.Width, destination.Height), ImageLockMode.WriteOnly, PixelFormat.Format1bppIndexed);

// Create destination buffer

imageSize = destinationData.Stride * destinationData.Height;

byte[] destinationBuffer = new byte[imageSize];

int sourceIndex = 0;

int destinationIndex = 0;

int pixelTotal = 0;

byte destinationValue = 0;

int pixelValue = 128;

int height = source.Height;

int width = source.Width;

int threshold = 500;

// Iterate lines

for (int y = 0; y < height; y++)

{

sourceIndex = y * sourceData.Stride;

destinationIndex = y * destinationData.Stride;

destinationValue = 0;

pixelValue = 128;

// Iterate pixels

for (int x = 0; x < width; x++)

{

// Compute pixel brightness (i.e. total of Red, Green, and Blue values)

pixelTotal = sourceBuffer[sourceIndex + 1] + sourceBuffer[sourceIndex + 2] + sourceBuffer[sourceIndex + 3];

if (pixelTotal > threshold)

{

destinationValue += (byte)pixelValue;

}

if (pixelValue == 1)

{

destinationBuffer[destinationIndex] = destinationValue;

destinationIndex++;

destinationValue = 0;

pixelValue = 128;

}

else

{

pixelValue >>= 1;

}

sourceIndex += 4;

}

if (pixelValue != 128)

{

destinationBuffer[destinationIndex] = destinationValue;

}

}

// Copy binary image data to destination bitmap

Marshal.Copy(destinationBuffer, 0, destinationData.Scan0, imageSize);

// Unlock destination bitmap

destination.UnlockBits(destinationData);

// Return

return destination;

}

#endregion

Hi Saravanan,

Thank you for sharing the sample document.

I have tested your provided sample against the latest build of Aspose.BarCode for .NET v5.1.0. I regretfully inform you that the latest version was unable to recognize barcodes from your sample. This problem has been logged in our bug tracking system under ticket Id BARCODENET-33368. We will soon investigate the cause of recognition failure and share our results here. Also, you will be notified once the fix for your problem is available for public use.

Please accept our apologies for your inconvenience.

The issues you have found earlier (filed as BARCODENET-33368) have been fixed in this update.


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