使用vb.net比较图像的哪种算法

问题描述

请帮助我.

please help me.

thanks in advance.

推荐答案

Private Sub btnCheck_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles btnGo.Click
    Me.Cursor = Cursors.WaitCursor
    Application.DoEvents()
 
    ' Get the threshold.
    Dim threshold As Integer = _
        Integer.Parse(txtThreshold.Text)
 
    ' Load the images.
    Dim bmp1 As Bitmap = Image.FromFile(txtFile1.Text)
    Dim bmp2 As Bitmap = Image.FromFile(txtFile2.Text)
 
    ' Make a difference image.
    Dim wid As Integer = Math.Min(bmp1.Width, bmp2.Width)
    Dim hgt As Integer = Math.Min(bmp1.Height, bmp2.Height)
    Dim bmp3 As New Bitmap(wid, hgt)
 
    ' Create the difference image.
    Dim are_identical As Boolean = True
    Dim r1, g1, b1, r2, g2, b2, r3, g3, b3 As Integer
    Dim color1, color2 As Color
    Dim eq_color As Color = Color.White
    Dim ne_color As Color = Color.Red
    Dim dr, dg, db, diff As Integer
    For x As Integer = 0 To wid - 1
        For y As Integer = 0 To hgt - 1
            color1 = bmp1.GetPixel(x, y)
            color2 = bmp2.GetPixel(x, y)
            dr = CInt(color1.R) - color2.R
            dg = CInt(color1.G) - color2.G
            db = CInt(color1.B) - color2.B
            diff = dr * dr + dg * dg + db * db
            If diff <= threshold Then
                bmp3.SetPixel(x, y, eq_color)
            Else
                bmp3.SetPixel(x, y, ne_color)
                are_identical = False
            End If
        Next y
    Next x
 
    ' Display the result.
    picResult.Image = bmp3
 
    Me.Cursor = Cursors.Default
    If (bmp1.Width <> bmp2.Width) OrElse (bmp1.Height <> _
        bmp2.Height) Then are_identical = False
    If are_identical Then
        MessageBox.Show("The images are identical")
    Else
        MessageBox.Show("The images are different")
    End If
 
    bmp1.Dispose()
    bmp2.Dispose()
End Sub

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