ByteScout Barcode Suite - VB.NET - Barcode image preprocessing filters with barcode reader sdk - ByteScout

ByteScout Barcode Suite – VB.NET – Barcode image preprocessing filters with barcode reader sdk

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barcode image preprocessing filters with barcode reader sdk in VB.NET and ByteScout Barcode Suite

Learn to code barcode image preprocessing filters with barcode reader sdk in VB.NET: How-To tutorial

Here you may get thousands pre-made source code samples for simple implementation in your own programming VB.NET projects. ByteScout Barcode Suite was made to help with barcode image preprocessing filters with barcode reader sdk in VB.NET. ByteScout Barcode Suite is the bundle that privides 3 SDK products to generate barcodes (Barcode SDK), read barcodes (Barcode Reaer SDK) and read and write spreadsheets (Spreadsheet SDK).

Save time on writing and testing code by using the code below and use it in your application. Follow the steps-by-step instructions from the scratch to work and copy and paste code for VB.NET into your editor. VB.NET application implementation mostly involves various stages of the software development so even if the functionality works please check it with your data and the production environment.

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Module1.vb
      
Imports Bytescout.BarCodeReader Module Module1 ''' <summary> ''' This exmaple demonstrates the use of image filters to improve the decoding or speed. ''' </summary> Sub Main() Using reader As New Reader("demo", "demo") ' Set barcode type to find reader.BarcodeTypesToFind.Code128 = True ' WORKING WITH LOW CONTRAST BARCODE IMAGES ' Add the contrast adjustment for the low contrast image reader.ImagePreprocessingFilters.AddContrast(40) Console.WriteLine("Image {0}", "low-contrast-barcode.png") ' ----------------------------------------------------------------------- ' NOTE: We can read barcodes from specific page to increase performance . ' For sample please refer to "Decoding barcodes from PDF by pages" program. ' ----------------------------------------------------------------------- Dim barcodes As FoundBarcode() = reader.ReadFrom("low-contrast-barcode.png") If barcodes.Length = 0 Then Console.WriteLine("No barcode found!") Else For Each barcode As FoundBarcode In barcodes Console.WriteLine("Found barcode {0} with value '{1}'", barcode.Type, barcode.Value) Next End If reader.ImagePreprocessingFilters.Clear() Console.WriteLine() ' WORKING WITH NOISY BARCODE IMAGES ' Add the median filter to lower the noise reader.ImagePreprocessingFilters.AddMedian() Console.WriteLine("Image {0}", "noisy-barcode.png") barcodes = reader.ReadFrom("noisy-barcode.png") If barcodes.Length = 0 Then Console.WriteLine("No barcode found!") Else For Each barcode As FoundBarcode In barcodes Console.WriteLine("Found barcode {0} with value '{1}'", barcode.Type, barcode.Value) Next End If reader.ImagePreprocessingFilters.Clear() Console.WriteLine() ' WORKING WITH DENSE AND ILLEGIBLE BARCODES ' Add the scale filter to enlarge the barcode to make gaps between bars more distinguishable reader.ImagePreprocessingFilters.AddScale(2) ' enlarge twice Console.WriteLine("Image {0}", "too-dense-barcode.png") barcodes = reader.ReadFrom("too-dense-barcode.png") If barcodes.Length = 0 Then Console.WriteLine("No barcode found!") Else For Each barcode As FoundBarcode In barcodes Console.WriteLine("Found barcode {0} with value '{1}'", barcode.Type, barcode.Value) Next End If reader.ImagePreprocessingFilters.Clear() Console.WriteLine() ' REMOVE EMPTY MARGINS FROM IMAGE TO SPEED UP THE PROCESSING ' Add the crop filter to cut off empty margins from the image. ' This will not improve the recognition quality but may speed up the processing ' if you enabled multiple barcode types to search. reader.ImagePreprocessingFilters.AddCropDark() Console.WriteLine("Image {0}", "barcode-with-large-margins.png") barcodes = reader.ReadFrom("barcode-with-large-margins.png") If barcodes.Length = 0 Then Console.WriteLine("No barcode found!") Else For Each barcode As FoundBarcode In barcodes Console.WriteLine("Found barcode {0} with value '{1}'", barcode.Type, barcode.Value) Next End If reader.ImagePreprocessingFilters.Clear() Console.WriteLine() End Using Console.WriteLine("Press any key to exit..") Console.ReadKey() End Sub End Module

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