DETEKSI TEPI

 

Private Sub Command1_Click()

Dim Op_X(-1 To 0, -1 To 0) As Integer, Op_Y(-1 To 0, -1 To 0) As Integer

Dim X As Integer, Y As Integer, I As Integer, J As Integer

Pic2.Cls

Grad = 0

Op_X(-1, -1) = 1: Op_X(0, -1) = 0

Op_X(-1, 0) = 0: Op_X(0, 0) = -1

Op_Y(-1, -1) = 0: Op_Y(0, -1) = -1

Op_Y(-1, 0) = 1: Op_Y(0, 0) = 0

For Y = 0 To Pic1.Height - 1

    For X = 0 To Pic1.Width - 1

        GradX = 0: GradY = 0: Grad = 0

        If X = 0 Or Y = 0 Or X = Pic1.Width - 1 Or Y = Pic1.Height - 1 Then

            Grad = 0

        Else

            For I = -1 To 0

                For J = -1 To 0

                PixelValue = GetPixel(Pic1.hdc, X + I, Y + J) ' dapatkan pixel dari posisi x + i dan y + j

                DecTORGB PixelValue, R, G, B 'fungsi proses mendapatkan nilai RGB

                Itensity = (R + G + B) / 3 'Itensitas / B & W

                GradX = GradX + (Itensity * Op_X(I, J))

                GradY = GradY + (Itensity * Op_Y(I, J))

                Next J

            Next I

            Grad = Round(Sqr(Abs(GradX * GradX) + Abs(GradY * GradY)))

        End If

        If Grad <= 0 Then Grad = 0: If Grad >= 255 Then Grad = 255

        SetPixel Pic2.hdc, X, Y, RGB(Grad, Grad, Grad)

        Pic2.Refresh

    Next X

    Pic2.Refresh

Next Y

End Sub

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