vb.net 教程 5-15 图像处理之内存处理1

发布时间：2020-12-17 07:34:12 所属栏目：百科来源：网络整理

导读：关于lockbits的使用，请看《 vb.net 教程 5-14 图像处理之内存处理基础1》系列图像处理之内存处理对应图像处理之像素处理，具体的算法请参考《 vb.net 教程 5-13 图像处理之像素处理1》，我把代码重新写到了使用LockBits。红色通道： '红色通道 'http://b

关于lockbits的使用，请看《 vb.net 教程 5-14 图像处理之内存处理基础1》系列

图像处理之内存处理对应图像处理之像素处理，

具体的算法请参考《 vb.net 教程 5-13 图像处理之像素处理1》，我把代码重新写到了使用LockBits。

红色通道：

    '红色通道
    'http://blog.csdn.net/uruseibest
    Private Sub btnRed_Click(sender As Object,e As EventArgs) Handles btnRed.Click
        Dim destImg As New Bitmap(sourceImg.Width,sourceImg.Height)
        Dim sourceData As BitmapData = sourceImg.LockBits(New Rectangle(0,sourceImg.Width,sourceImg.Height),ImageLockMode.ReadOnly,PixelFormat.Format24bppRgb)
        Dim destData As BitmapData = destImg.LockBits(New Rectangle(0,ImageLockMode.WriteOnly,PixelFormat.Format24bppRgb)

        Dim pSource As IntPtr = sourceData.Scan0
        Dim allBytes As Integer = sourceData.Stride * sourceData.Height
        Dim rgbvalues() As Byte
        ReDim rgbvalues(allBytes - 1)
        Marshal.Copy(pSource,rgbvalues,allBytes)

        Dim pos As Integer = 0
        Dim R,G,B As Integer

        For j As Integer = 0 To sourceData.Height - 1
            For i As Integer = 0 To sourceData.Width - 1
                'B = rgbvalues(pos)
                'G = rgbvalues(pos + 1)
                R = rgbvalues(pos + 2)
                rgbvalues(pos) = R
                rgbvalues(pos + 1) = R
                rgbvalues(pos + 2) = R

                pos = pos + 3
            Next
            pos = pos + sourceData.Stride - sourceData.Width * 3
        Next

        Dim pDest As IntPtr = destData.Scan0
        Marshal.Copy(rgbvalues,pDest,allBytes)

        sourceImg.UnlockBits(sourceData)
        destImg.UnlockBits(destData)

        picDest.Image = destImg
    End Sub

绿色通道：

    '绿色通道
    'http://blog.csdn.net/uruseibest
    Private Sub btnGreen_Click(sender As Object,e As EventArgs) Handles btnGreen.Click
        Dim destImg As New Bitmap(sourceImg.Width,B As Integer

        For j As Integer = 0 To sourceData.Height - 1
            For i As Integer = 0 To sourceData.Width - 1
                'B = rgbvalues(pos)
                G = rgbvalues(pos + 1)
                'R = rgbvalues(pos + 2)
                rgbvalues(pos) = G
                rgbvalues(pos + 1) = G
                rgbvalues(pos + 2) = G

                pos = pos + 3
            Next
            pos = pos + sourceData.Stride - sourceData.Width * 3
        Next

        Dim pDest As IntPtr = destData.Scan0
        Marshal.Copy(rgbvalues,allBytes)

        sourceImg.UnlockBits(sourceData)
        destImg.UnlockBits(destData)

        picDest.Image = destImg
    End Sub

蓝色通道：

    '蓝色通道
    'http://blog.csdn.net/uruseibest
    Private Sub btnBlue_Click(sender As Object,e As EventArgs) Handles btnBlue.Click
        Dim destImg As New Bitmap(sourceImg.Width,B As Integer

        For j As Integer = 0 To sourceData.Height - 1
            For i As Integer = 0 To sourceData.Width - 1
                B = rgbvalues(pos)
                'G = rgbvalues(pos + 1)
                'R = rgbvalues(pos + 2)
                rgbvalues(pos) = B
                rgbvalues(pos + 1) = B
                rgbvalues(pos + 2) = B

                pos = pos + 3
            Next
            pos = pos + sourceData.Stride - sourceData.Width * 3
        Next

        Dim pDest As IntPtr = destData.Scan0
        Marshal.Copy(rgbvalues,allBytes)

        sourceImg.UnlockBits(sourceData)
        destImg.UnlockBits(destData)

        picDest.Image = destImg
    End Sub

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