vb.net 教程 5-13 图像处理之像素处理 7

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vb.net 教程 5-13 图像处理之像素处理 7

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浮雕的算法：

下一行的红绿蓝颜色分量减去上一行的红绿蓝颜色分量，再加上128

如果小于0，那么等于0，如果大于255，那么等于255

R=R(i-1,j)-R(i,j)+128

G=G(i-1,j)-G(i,j)+128

B=B(i-1,j)-B(i,j)+128

主要代码如下：

'浮雕1

Private Sub btnEmboss_Click(sender As Object, e As EventArgs) Handles btnEmboss.Click

Dim pSourceColor1 As Color

Dim pSourceColor2 As Color

Dim pDestColor As Color

Dim destImg As New Bitmap(sourceImg.Width, sourceImg.Height)

Dim R, G, B As Integer

Dim R1, G1, B1 As Integer

Dim R2, G2, B2 As Integer

For i As Integer = 1 To sourceImg.Width - 1

For j As Integer = 0 To sourceImg.Height - 1

pSourceColor1 = sourceImg.GetPixel(i, j)

R1 = pSourceColor1.R

G1 = pSourceColor1.G

B1 = pSourceColor1.B

pSourceColor2 = sourceImg.GetPixel(i - 1, j)

R2 = pSourceColor2.R

G2 = pSourceColor2.G

B2 = pSourceColor2.B

R = R1 - R2 + 128

G = G1 - G2 + 128

B = B1 - B2 + 128

If R < 0 Then R = 0

If R > 255 Then R = 255

If G < 0 Then G = 0

If G > 255 Then G = 255

If B < 0 Then B = 0

If B > 255 Then B = 255

pDestColor = Color.FromArgb(R, G, B)

destImg.SetPixel(i, j, pDestColor)

picDest.Image = destImg

End Sub

运行效果如下：

我还看到了另外一个算法：

下一行的红绿蓝颜色分量减去上一行的红绿蓝颜色分量的绝对值，再加上128

如果小于0，那么等于0，如果大于255，那么等于255

R=Abs(R(i-1,j)-R(i,j))+128

G=Abs(G(i-1,j)-G(i,j))+128

B=Abs(B(i-1,j)-B(i,j))+128

主要代码如下：

'浮雕2

Private Sub btnEmboss2_Click(sender As Object, e As EventArgs) Handles btnEmboss2.Click