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  • vb.net 教程 5-15 图像处理之内存处理 3

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具体算法请参看《vb.net 教程 5-13 图像处理之像素处理 3》
 
灰度:均值法:
 
 
 
    '灰度:均值法
    'http://blog.csdn.net/uruseibest
    Private Sub btnGray1_Click(sender As Object, e As EventArgs) Handles btnGray1.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
        Dim avgValue 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)
                avgValue = (B + G + R) / 3
                rgbvalues(pos) = avgValue
                rgbvalues(pos + 1) = avgValue
                rgbvalues(pos + 2) = avgValue
 
                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
灰度:指数加权法:
 
 
 
 
 
 
 
 
 
 
 
    '灰度:指数加权法
    'http://blog.csdn.net/uruseibest
    Private Sub btnGray2_Click(sender As Object, e As EventArgs) Handles btnGray2.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
        Dim y 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)
 
                y = R * 0.3 + G * 0.59 + B * 0.11
                rgbvalues(pos) = y
                rgbvalues(pos + 1) = y
                rgbvalues(pos + 2) = y
 
                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
 
 
 
 
 
 
 
 
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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。
原文链接:https://blog.csdn.net/uruseibest/article/details/70543937

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