vb.net 教程 5-15 图像处理之内存处理1

àì夳堔傛蜴生んèń 2022-09-11 00:17 8阅读 0赞

版权声明：本文为博主原创文章，转载请在显著位置标明本文出处以及作者网名，未经作者允许不得用于商业目的。  
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, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb)  
        Dim destData As BitmapData = destImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), 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, 0, 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, 0, 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, sourceImg.Height)  
        Dim sourceData As BitmapData = sourceImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb)  
        Dim destData As BitmapData = destImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), 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, 0, 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) = 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, 0, pDest, 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, sourceImg.Height)  
        Dim sourceData As BitmapData = sourceImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb)  
        Dim destData As BitmapData = destImg.LockBits(New Rectangle(0, 0, sourceImg.Width, sourceImg.Height), 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, 0, 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) = 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, 0, pDest, allBytes)  
   
        sourceImg.UnlockBits(sourceData)  
        destImg.UnlockBits(destData)  
   
        picDest.Image = destImg  
    End Sub

学习更多vb.net知识，请参看[vb.net教程][vb.net] 目录

————————————————  
版权声明：本文为CSDN博主「VB.Net」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。

[vb.net]: https://www.xin3721.com/eschool/vbnetxin3721/