Implementasi Algoritma Edge Detection Operator Sobel pada Proses Perbaikan Kualitas Citra Teks

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LISTING PROGRAM

1. Menu

Public Class frmMenu

Private Sub HelpToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HelpToolStripMenuItem.Click

frmHelp.Show() End Sub

Private Sub QuitToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles QuitToolStripMenuItem.Click

End End Sub

Private Sub AboutToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AboutToolStripMenuItem.Click

frmAbt.Show() End Sub

Private Sub ToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem1.Click

frmEdges1.Show() End Sub

End Class

2. EdgeDetect

Public Class frmEdges1

Dim bmap As Bitmap 'deklarasi gambar/image dengan tipe Bitmap Dim PicAda As Boolean

Dim NmFIle As String Dim nmFILE1 As String Private displayBM As Bitmap

Private Sub cmdLoad_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdLoad.Click

OpenFileDialog1.Filter = "Images|*.JPG;*.BMP" OpenFileDialog1.ShowDialog()

If OpenFileDialog1.FileName = "" Then Exit Sub PicAda = True

Pic1.Image = Image.FromFile(OpenFileDialog1.FileName)

Pic1.Width = Pic1.Height * Pic1.Image.Width / Pic1.Image.Height NmFIle = OpenFileDialog1.FileName

lblNmFile.Text = NmFIle

Dim fileDetails As System.IO.FileInfo = New System.IO.FileInfo(NmFIle) lblSize.Text = fileDetails.Length.ToString

cmdProses.Enabled = True End Sub

Private Sub cmdProses_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdProses.Click

cmdLoad.Enabled = False cmdProses.Enabled = False If PicAda = False Then

MsgBox("Pilih dulu gambar yang akan diproses", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Error Proses")

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bmap = New Bitmap(Pic1.Image) 'Gambar asli dijadikan gambar Bitmap Pic2.Image = bmap

Dim tempbmp As New Bitmap(Pic2.Image) 'deklarasi gambar Bitmap dari gambar asli untuk diproses

Dim DX As Integer Dim DY As Integer

Dim Red, Green, Blue, Grey As Integer Dim X, Y As Integer

ProgressBar1.Width = Pic2.Width ProgressBar1.Show()

With tempbmp

For X = DX To .Height - DX - 1 For Y = DY To .Width - DY - 1

Red = CInt(.GetPixel(Y, X).R) Green = CInt(.GetPixel(Y, X).G) Blue = CInt(.GetPixel(Y, X).B) Grey = (Red + Green + Blue) / 3

Dim clr As Color = bmap.GetPixel(Y, X) If (Grey < 128) Then

Red = 0 Green = 0 Blue = 0 Else

Red = 255 Blue = 255 Green = 255 End If

bmap.SetPixel(Y, X, Color.FromArgb(Red, Green, Blue)) Next

If X Mod 10 = 0 Then Pic2.Invalidate()

Me.Text = "Progres Proses Biner : " & Int(100 * X / _ (Pic2.Image.Height - 2)).ToString & "%"

ProgressBar1.Value = Int(100 * X / (Pic2.Image.Height - 2)) Pic2.Refresh()

End If Next End With

ProgressBar1.Hide() Pic2.Refresh()

Me.Text = "Pengolahan Citra : Proses Biner berhasil" Call SobelH()

Call SobelV() End Sub

Sub SobelH()

If PicAda = False Then

MsgBox("Pilih dulu gambar yang akan diproses", _

MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Error Proses") Exit Sub

End If

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bmap = New Bitmap(Pic2.Image) Pic3.Image = bmap

Dim tempbmp As New Bitmap(Pic3.Image) Dim DX As Integer = 1

Dim DY As Integer = 1

Dim Red As Integer, Green As Integer, Blue As Integer Dim i As Integer, j As Integer

Dim k As Integer, l As Integer 'untuk mask border ProgressBar1.Width = Pic3.Width

ProgressBar1.Show()

With bmap

For i = DX To .Height - DX - 1 For j = DY To .Width - DY - 1

'proses matriks filter

'point(j,i)*e --> titik tengah

Red = CInt(.GetPixel(j, i).R) * MF(1, 1) Green = CInt(.GetPixel(j, i).G) * MF(1, 1) Blue = CInt(.GetPixel(j, i).B) * MF(1, 1) 'proses titik tetangga

'point(j-1,i-1)*a--> MF(0,0)--> titik kiri atas If j - 1 < 1 And i - 1 < 1 Then

Red = Red + (CInt(.GetPixel(j, i).R) * MF(0, 0)) Green = Green + (CInt(.GetPixel(j, i).G) * MF(0, 0)) Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(0, 0)) Else

Red = Red + (CInt(.GetPixel(j - 1, i - 1).R) * _ MF(0, 0))

Green = Green + (CInt(.GetPixel(j - 1, i - 1).G) * _ MF(0, 0))

Blue = Blue + (CInt(.GetPixel(j - 1, i - 1).B) * _ MF(0, 0))

End If

If i - 1 < 1 Then

Red = Red + (CInt(.GetPixel(j, i - 1).R) * MF(0, 1)) Green = Green + (CInt(.GetPixel(j, i - 1).G) * _ MF(0, 1))

Blue = Blue + (CInt(.GetPixel(j, i - 1).B) * MF(0, 1)) End If

If j + 1 > .Width - DY - 1 And i - 1 > 1 Then

Red = Red + (CInt(.GetPixel(j + 1, i - 1).R) * _ MF(0, 2))

Green = Green + (CInt(.GetPixel(j + 1, i - 1).G) * _ MF(0, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i - 1).B) * _ MF(0, 2))

End If

If j - 1 < 1 Then

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Green = Green + (CInt(.GetPixel(j - 1, i).G) * _ MF(1, 0))

Blue = Blue + (CInt(.GetPixel(j - 1, i).B) * MF(1, 0)) End If

If j + 1 > .Width - DY - 1 Then

Red = Red + (CInt(.GetPixel(j + 1, i).R) * MF(1, 2)) Green = Green + (CInt(.GetPixel(j + 1, i).G) * _

MF(1, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i).B) * MF(1, 2)) End If

If j - 1 < 1 And i + 1 > .Height - DX - 1 Then Red = Red + (CInt(.GetPixel(j, i).R) * MF(2, 0)) Green = Green + (CInt(.GetPixel(j, i).G) * MF(2, 0)) Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(2, 0)) Else

Red = Red + (CInt(.GetPixel(j - 1, i + 1).R) * _ MF(2, 0))

Green = Green + (CInt(.GetPixel(j - 1, i + 1).G) * _ MF(2, 0))

Blue = Blue + (CInt(.GetPixel(j - 1, i + 1).B) * _ MF(2, 0))

End If

If i + 1 > .Height - DX - 1 Then

Red = Red + (CInt(.GetPixel(j, i + 1).R) * MF(2, 1)) Green = Green + (CInt(.GetPixel(j, i + 1).G) * _

MF(2, 1))

Blue = Blue + (CInt(.GetPixel(j, i + 1).B) * MF(2, 1)) End If

If j + 1 > .Width - DY - 1 And i + 1 > .Height - DX – 1 Then

Red = Red + (CInt(.GetPixel(j + 1, i + 1).R) * _ MF(2, 2))

Green = Green + (CInt(.GetPixel(j + 1, i + 1).G) _ * MF(2, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i + 1).B) * _ MF(2, 2))

End If

If Red < 0 Then Red = 0 Else

If Red > 255 Then Red = 255 End If

End If

If Green < 0 Then Green = 0 Else

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End If End If

If Blue < 0 Then Blue = 0 Else

If Blue > 255 Then Blue = 255 End If

End If

bmap.SetPixel(j, i, Color.FromArgb(Red, Green, Blue)) Next

If i Mod 10 = 0 Then Pic3.Invalidate()

Me.Text = Int(100 * i / (Pic3.Image.Height - 2))_ .ToString & "%"

ProgressBar1.Value = Int(100 * i / (Pic3.Image.Height - 2)) Pic3.Refresh()

End Sub Sub SobelV()

If PicAda = False Then

MsgBox("Pilih dulu gambar yang akan diproses", _

MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Error Proses") Exit Sub

End If

Dim MF(2, 2) As Double

MF(0, 0) = 1 'a MF(0, 1) = 0 'b MF(0, 2) = -1 'c MF(1, 0) = 2 'd MF(1, 1) = 0 'e MF(1, 2) = -2 'f MF(2, 0) = 1 'g MF(2, 1) = 0 'h MF(2, 2) = -1 'i

bmap = New Bitmap(Pic2.Image) Pic4.Image = bmap

Dim tempbmp As New Bitmap(Pic4.Image) Dim DX As Integer = 1

Dim DY As Integer = 1

Dim Red As Integer, Green As Integer, Blue As Integer Dim i As Integer, j As Integer

Dim k As Integer, l As Integer 'untuk kernel border ProgressBar1.Width = Pic4.Width

ProgressBar1.Show()

With bmap

For i = DX To .Height - DX - 1 For j = DY To .Width - DY - 1

Red = CInt(.GetPixel(j, i).R) * MF(1, 1) Green = CInt(.GetPixel(j, i).G) * MF(1, 1) Blue = CInt(.GetPixel(j, i).B) * MF(1, 1) If j - 1 < 1 And i - 1 < 1 Then

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Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(0, 0)) Else

Red = Red + (CInt(.GetPixel(j - 1, i - 1).R) * _ MF(0, 0))

Green = Green + (CInt(.GetPixel(j - 1, i - 1).G) * _ MF(0, 0))

Blue = Blue + (CInt(.GetPixel(j - 1, i - 1).B) * _ MF(0, 0))

End If

If i - 1 < 1 Then

Red = Red + (CInt(.GetPixel(j, i - 1).R) * MF(0, 1)) Green = Green + (CInt(.GetPixel(j, i - 1).G) * _

MF(0, 1))

Blue = Blue + (CInt(.GetPixel(j, i - 1).B) * MF(0, 1)) End If

If j + 1 > .Width - DY - 1 And i - 1 > 1 Then

Red = Red + (CInt(.GetPixel(j + 1, i - 1).R) * _ MF(0, 2))

Green = Green + (CInt(.GetPixel(j + 1, i - 1).G) * _ MF(0, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i - 1).B) * _ MF(0, 2))

End If

If j - 1 < 1 Then

Red = Red + (CInt(.GetPixel(j - 1, i).R) * MF(1, 0)) Green = Green + (CInt(.GetPixel(j - 1, i).G) * _

MF(1, 0))

Blue = Blue + (CInt(.GetPixel(j - 1, i).B) * MF(1, 0)) End If

If j + 1 > .Width - DY - 1 Then

Red = Red + (CInt(.GetPixel(j + 1, i).R) * MF(1, 2)) Green = Green + (CInt(.GetPixel(j + 1, i).G) * _

MF(1, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i).B) * MF(1, 2)) End If

If j - 1 < 1 And i + 1 > .Height - DX - 1 Then Red = Red + (CInt(.GetPixel(j, i).R) * MF(2, 0)) Green = Green + (CInt(.GetPixel(j, i).G) * MF(2, 0)) Blue = Blue + (CInt(.GetPixel(j, i).B) * MF(2, 0)) Else

Red = Red + (CInt(.GetPixel(j - 1, i + 1).R) * _ MF(2, 0))

Green = Green + (CInt(.GetPixel(j - 1, i + 1).G) _ * MF(2, 0))

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MF(2, 0)) End If

If i + 1 > .Height - DX - 1 Then

Red = Red + (CInt(.GetPixel(j, i + 1).R) * MF(2, 1)) Green = Green + (CInt(.GetPixel(j, i + 1).G) * _

MF(2, 1))

Blue = Blue + (CInt(.GetPixel(j, i + 1).B) * MF(2, 1)) End If

If j + 1 > .Width - DY - 1 And i + 1 > .Height - DX – 1 _ Then

Red = Red + (CInt(.GetPixel(j + 1, i + 1).R) * _ MF(2, 2))

Green = Green + (CInt(.GetPixel(j + 1, i + 1).G) _ * MF(2, 2))

Blue = Blue + (CInt(.GetPixel(j + 1, i + 1).B) * _ MF(2, 2))

End If

If Red < 0 Then Red = 0 Else

If Red > 255 Then Red = 255 End If

End If

If Green < 0 Then Green = 0 Else

If Green > 255 Then Green = 255 End If

End If

If Blue < 0 Then Blue = 0 Else

If Blue > 255 Then Blue = 255 End If

End If

bmap.SetPixel(j, i, Color.FromArgb(Red, Green, Blue)) Next

If i Mod 10 = 0 Then Pic4.Invalidate()

Me.Text = Int(100 * i / (Pic4.Image.Height - 2)).ToString_ & "%"

ProgressBar1.Value = Int(100 * i / (Pic4.Image.Height - 2)) Pic4.Refresh()

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Private Sub cmdKeluar_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles cmdKeluar.Click

Close() End Sub

Private Sub cmdBersih_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles cmdBersih.Click

Pic1.Image = Nothing Pic2.Image = Nothing Pic3.Image = Nothing Pic4.Image = Nothing lblNmFile.Text = "" lblNmFile1.Text = "" lblSize.Text = "" lblSize1.Text = ""

cmdSimpan.Enabled = False cmdLoad.Enabled = True End Sub

Private Sub cmdSimpan_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles cmdSimpan.Click

cmdSimpan.Enabled = False Dim i As Integer

Dim str As String For i = 1 To 1000

If i < 10 Then str = "Picture_00" & i.ToString & ".jpg"

If i > 9 And i < 100 Then str = "Picture_0" & i.ToString & ".jpg" If i > 99 Then str = "Picture_" & i.ToString & ".jpg"

If i > 900 Then MsgBox("err")

If Not System.IO.File.Exists(str) Then Try

Pic3.Image.Save(str, _

System.Drawing.Imaging.ImageFormat.Jpeg) System.Drawing.Imaging.ImageFormat.Png)

lblNmFile1.Text = Application.StartupPath & "\" & str Catch Ex As Exception

MsgBox("Gagal") End Try

Exit For End If Next

Dim fileDetails As System.IO.FileInfo = New _ System.IO.FileInfo(lblNmFile1.Text) lblSize1.Text = fileDetails.Length.ToString

MsgBox("Gambar berhasil di simpan ...", MsgBoxStyle.OkOnly, _ "Save Sukses")

cmdLoad.Enabled = True End Sub

Private Sub frmEdges1_Load(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles MyBase.Load

cmdProses.Enabled = False cmdSimpan.Enabled = False cmdLoad.Focus()