The sample below shows how to extract images from PDF (page by page) in Visual Basic .NET without using any additional software

Imports Bytescout.PDFExtractor
Imports System.Drawing.Imaging

Class Program
	Friend Shared Sub Main(args As String())

        ' Create Bytescout.PDFExtractor.ImageExtractor instance
        Dim extractor As New ImageExtractor()
		extractor.RegistrationName = "demo"
		extractor.RegistrationKey = "demo"

		' Load sample PDF document
        extractor.LoadDocumentFromFile("sample1.pdf")

        ' Get count of pages
		Dim pageCount As Integer = extractor.GetPageCount()

        ' Extract images from each page
        For i As Integer = 0 To pageCount - 1

            Dim j As Integer = 0

            ' Initialize page images enumeration
            If extractor.GetFirstPageImage(i) Then
                Do
                    Dim outputFileName As String = "page" & i & "image" & j & ".png"

                    ' Save image to file
                    extractor.SaveCurrentImageToFile(outputFileName, ImageFormat.Png)

                    j = j + 1

                Loop While extractor.GetNextImage() ' Advance image enumeration
            End If

        Next

		' Open first output file in default associated application
        System.Diagnostics.Process.Start("page0image0.png")
	End Sub
End Class