Barcode Recognition User Guide & Tutorial

Visual Basic .NET:

    Dim barcodeData() As String
    barcodeData= reader.ReadBarcode(barcode.Image)
    txtDecodedData.Text = barcodeData(0)
    txtSymbology.Text = barcodeData(1)
    txtBarPattern.Text = barcodeData(2)

C# .NET:    

    string [] barcodeData= reader.ReadBarcode((Bitmap)barcode.Image);
    txtDecodedData.Text = barcodeData[0];
    txtSymbology.Text = barcodeData[1];
    txtBarPattern.Text = barcodeData[2];

Visual Basic .NET:

    'declare the beginning and ending pixels of the image on the x and y axis
    Dim xStart As Integer = 0
    Dim yStart As Integer = 0
    Dim xEnd As Integer = barcode.Image.Width
    Dim yEnd As Integer = barcode.Image.Height

    'set the end pixels to the upper left region of the image
    xEnd = xEnd / 2
    yEnd = yEnd / 2
    Dim PartialImgWidth As Integer = xEnd - xStart
    Dim PartialImgHeight As Integer = yEnd - yStart

    'Since picture box controls do not have a GetPixel method, create a bitmap to hold the partial image
    Dim copy As Bitmap
    Dim partialImage As Bitmap
    copy = New Bitmap(barcode.Image, barcode.Image.Width, barcode.Image.Height)
    partialImage = New Bitmap(PartialImgWidth, PartialImgHeight)
    Dim x As Integer
    Dim y As Integer

    'set the pixels of the partial image to the same color of the copied barcode image
    For x = xStart To xEnd - 1
        For y = yStart To yEnd - 1
            partialImage.SetPixel(x - xStart, y - yStart, copy.GetPixel(x, y))
        Next y
    Next x
    barcode.Image = partialImage

C# .NET:    

    //declare the beginning and ending pixels of the image on the x and y axis
    int xStart = 0;
    int yStart = 0;
    int xEnd = barcode.Image.Width;
    int yEnd = barcode.Image.Height;

    //now we will set the end pixels to the upper left region of the image
    xEnd /= 2;
    yEnd /= 2;
    int PartialImgWidth = xEnd - xStart;
    int PartialImgHeight = yEnd - yStart;

    //Since picture box controls do not have a GetPixel method, create a bitmap to hold the partial image
    Bitmap copy = new Bitmap(barcode.Image, barcode.Image.Width, barcode.Image.Height);
    Bitmap partialImage = new Bitmap(PartialImgWidth, PartialImgHeight);

    //set the pixels of the partial image to the same color of the copied barcode image
    for (int x = xStart; x < xEnd; x++)
    {
        for (int y = yStart; y < yEnd; y++)
        {
            partialImage.SetPixel(x - xStart, y - yStart, copy.GetPixel(x, y));
        }
    }
    barcode.Image = partialImage; 

Note: Other regions of the document may be easily specified by using the calculations below for other regions of the image:

    Upper Right:
        xStart = xEnd / 2
        yEnd = yEnd / 2
    Downward Left: 
        xEnd = xEnd / 2
        yStart = yEnd / 2
    Downward Right:
        xStart = xEnd / 2
        yStart = yEnd / 2

Visual Basic .NET:

    Dim reader As New IDAutomation.BarcodeDecoder.BarcodeDecoder
    reader.Angle = 90
    Dim barcodeData() As String
    barcodeData= reader.ReadBarcode(barcode.Image)
    txtDecodedData.Text = barcodeData(0)
    txtSymbology.Text = barcodeData(1)
    txtBarPattern.Text = barcodeData(2)

C# .NET:

    IDAutomation.BarcodeDecoder.BarcodeDecoder reader = new BarcodeDecoder();
    reader.Angle = 90;
    string [] barcodeData= reader.ReadBarcode((Bitmap)barcode.Image);
    txtDecodedData.Text = barcodeData[0];
    txtSymbology.Text = barcodeData[1];
    txtBarPattern.Text = barcodeData[2];

• Decode performance is improved by setting the Angle property to the angle that is most accurate. For example, if scanned barcodes usually appear at 7 degrees (meaning the barcode image is rotated 7 degrees clockwise), the Angle property should be 7. Additional performance is improved by setting all symbologies to false except the type that is being decoded.

• The first digit in an EAN 13 barcode is not actually encoded in the barcode. This first digit is produced based on a pattern of the next five digits. To enable this functionality set the ExpandToEAN13 property to true and the first digit will be present in the decoded string.

• This is a similar problem to the one above. If the ExpandToEAN13 property is set to true, all UPC-A barcodes will contain a leading zero because of the pattern contained in the first five digits. To disable, set the ExpandToEAN13 property to false and the leading zero will be truncated.

• Too much text in the document containing the barcode can cause this behavior. Refer to the source code example to pass a partial image into the ReadBarcode method of the BarcodeDecoder class.