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Marking BarCode Regions in the Image

Published: 01 Jun 2011 By Sher Azam

This technical tip shows how to read the image and mark all the barcode regions, for all the recognized barcodes in the image. The barcode region is the part of the image that only contains the barcode itself. In a large image, it is possible that there are other texts or images along with the barcode. Getting the barcode region will separate the barcodes from other text/objects in the image by marking their edges or by filling with some color.

[C#]
 
// create an instance of BarCodeReader class and specify the image and symbology
BarCodeReader reader;
reader = new BarCodeReader(@"code39Extended.jpg", BarCodeReadType.Code39Extended);
int counter = 0;
// read all the barcodes from the images
while (reader.Read())
{
    // display the symbology type
    Console.WriteLine("BarCode Type: " + reader.GetReadType());
    // display the codetext
    Console.WriteLine("BarCode CodeText: " + reader.GetCodeText());
    // get the barcode region
    Aspose.BarCodeRecognition.BarCodeRegion region = reader.GetRegion();
    if (region != null)
    {
        // Initialize an object of type Image to get the Graphics object
        Image img = System.Drawing.Image.FromFile(@"code39Extended.jpg");
        // initialize graphics object from the image
        Graphics g = Graphics.FromImage(img);
        // draw the barcode edges
        region.DrawBarCodeEdges(g, new Pen(Color.Red, 1f));
        // save the image
        img.Save(string.Format(@"edge_{0}.png", counter++));
        // fill the barcode area with some color
        region.FillBarCodeRegion(g, Brushes.Green);
        img.Save(string.Format(@"fill_{0}.png", counter++));
    }
}
reader.Close();
 
[VB.NET]
 
'create an instance of BarCodeReader class and specify the image and symbology
Dim reader As BarCodeReader
reader = New BarCodeReader("c:\test.jpg", BarCodeReadType.Code39Standard)
Dim counter As Integer
'read all the barcodes from the images
While reader.Read()
    counter = counter + 1
    'display the symbology type
    Console.WriteLine("BarCode Type: " + reader.GetReadType().ToString)
    'display the code text
    Console.WriteLine("BarCode CodeText: " + reader.GetCodeText())
    Dim region As BarCodeRegion
    'get the barcode region
    region = reader.GetRegion()
    If Not region Is Nothing Then
        'Initialize an object of type Image to get the Graphics object
        Dim img As Image = System.Drawing.Image.FromFile("c:\test.jpg")
        'initialize graphics object from the image
        Dim g As Graphics = Graphics.FromImage(img)
        'draw the barcode edges
        region.DrawBarCodeEdges(g, New Pen(Color.Red, 1.0F))
        img.Save(String.Format(".\edge_{0}.png", counter))
        'fill the barcode area with some color
        region.FillBarCodeRegion(g, Brushes.Green)
        img.Save(String.Format(".\fill_{0}.png", counter))
    End If
End While
reader.Close()

Marking BarCode Regions in images read the image mark all barcode regions recognized barcodes in the image Get barcode region

Discussion

Subject	Author	Date
Nice - upcoming article	Sonu Kapoor	03/06/2011 11:10 AM
Nice code sample. We have an upcoming article coming about code 39 bar codes by Scott Mitchell. It will be published on the 17th June. Keep an eye on the homepage. [MVP since 2005] [MCAD] Webmaster of DotNetSlackers Question or Suggestion? Feel free to ask my any .NET question Our Posting FAQ Reply \| Permanent link

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Marking BarCode Regions in the Image

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