/// <summary>
/// 车牌校正
/// </summary>
public void RectifyLP(out GrayImg pDestImg, GrayImg pSrcImg, GrayImg pModelImg, ref PAngle Angle)
{
pDestImg = new GrayImg();
GrayImg RowDiffImg;
Diff(out RowDiffImg, pModelImg, "TPrjType.H_FILTER");
HoughTrans(ref Angle, RowDiffImg, "TPrjType.V_FILTER");
Diff(out RowDiffImg, pModelImg, "TPrjType.V_FILTER");
HoughTrans(ref Angle, RowDiffImg, "TPrjType.H_FILTER");
RectifyLP_2(out pDestImg, pSrcImg, Angle);
}
/// <summary>
/// 倾斜度校正（新增）
/// </summary>
/// <param name="pDestImg"></param>
/// <param name="pSrcImg"></param>
/// <param name="Angle"></param>
public void RectifyLP_2(out GrayImg pDestImg, GrayImg pSrcImg, PAngle Angle)
{
int i, j;
double RectifyAngle = 0; ;
int iAngle;
GrayImg TempImg1, TempImg2;
PicBase.ImgMalloc(out TempImg1, pSrcImg.Width, pSrcImg.Height);
if (Math.Abs(Angle.HAngle + 90) != 90.0)
RectifyAngle = -(Angle.HAngle + 90.0) / 180.0f * Math.PI;
for (i = 0; i < pSrcImg.Width; i++)
for (j = 0; j < pSrcImg.Height; j++)
{
if (i * Math.Tan(RectifyAngle) < 0.0)
iAngle = (int)(i * Math.Tan(RectifyAngle) - 0.5);
else
iAngle = (int)(i * Math.Tan(RectifyAngle) + 0.5);
if ((j - iAngle >= 0) && (j - iAngle < pSrcImg.Height))
{
TempImg1.Img[j * TempImg1.Width + i] = pSrcImg.Img[(j - iAngle) * pSrcImg.Width + i];
}
}
PicBase.ImgMalloc(out TempImg2, pSrcImg.Width, pSrcImg.Height);
if (Math.Abs(Angle.VAngle) != 90.0)
RectifyAngle = Angle.VAngle / 180.0f * Math.PI;
for (i = 0; i < TempImg1.Height; i++)
for (j = 0; j < TempImg1.Width; j++)
{
if (i * Math.Tan(RectifyAngle) < 0.0)
iAngle = (int)(i * Math.Tan(RectifyAngle) - 0.5);
else
iAngle = (int)(i * Math.Tan(RectifyAngle) + 0.5);
if ((j - iAngle >= 0) && (j - iAngle < TempImg1.Width))
{
TempImg2.Img[i * TempImg2.Width + j] = TempImg1.Img[i * TempImg1.Width + j - iAngle];
}
}
pDestImg.Width = TempImg2.Width;
pDestImg.Height = TempImg2.Height;
pDestImg.Img = TempImg2.Img;
}
/// <summary>
/// Hough变换进行车牌校正
/// </summary>
///
public int HoughTrans(ref PAngle pAngle, GrayImg pSrcImg, string PrjType)
{
int i, j, p, o, Max, Tempo;
int[] H;
int HWidth, HHeight;
double temp;
o = -90; p = 0;
HHeight = 4 * pSrcImg.Width + 1;
HWidth = 181;
H = new int[HWidth * HHeight];
for (i = -(HHeight / 2); i <= (HHeight / 2); i++)
for (j = -(HWidth / 2); j <= (HWidth / 2); j++)
H[(i + HHeight / 2) * HWidth + j + HWidth / 2] = 0;
switch (PrjType)
{
case "TPrjType.H_FILTER":
for (i = 0; i < pSrcImg.Height; i++)
for (j = 0; j < pSrcImg.Width; j++)
{
if (pSrcImg.Img[i * pSrcImg.Width + j] == 255)
{
for (o = -10; o <= 10; o++)
{
if (o >= 0)
Tempo = o + 80;
else
Tempo = o - 80;
temp = j * Math.Cos(Tempo * Math.PI / 180.0f) + i * Math.Sin(Tempo * Math.PI / 180.0f);
if (temp < 0.0)
p = (int)(temp - 0.5);
else
p = (int)(temp + 0.5);
if ((p + HHeight / 2 >= 0) && (p + HHeight / 2 < HHeight))
H[(p + HHeight / 2) * HWidth + Tempo + HWidth / 2]++;
}
}
}
Max = 0;
for (i = -HHeight / 2; i <= HHeight / 2; i++)
for (j = -10; j <= 10; j++)
{
if (j >= 0)
Tempo = j + 80;
else
Tempo = j - 80;
if (Max < H[(i + HHeight / 2) * HWidth + Tempo + HWidth / 2])
{
Max = H[(i + HHeight / 2) * HWidth + Tempo + HWidth / 2];
o = Tempo;
p = i;
}
}
pAngle.HAngle = o;
break;
case "TPrjType.V_FILTER":
for (i = 0; i < pSrcImg.Height; i++)
for (j = 0; j < pSrcImg.Width; j++)
{
if (pSrcImg.Img[i * pSrcImg.Width + j] == 255)
{
for (o = -10; o <= 10; o++)
{
temp = j * Math.Cos(o * Math.PI / 180.0f) + i * Math.Sin(o * Math.PI / 180.0f);
if (temp < 0.0)
p = (int)(temp - 0.5);
else
p = (int)(temp + 0.5);
if ((p + HHeight / 2 >= 0) && (p + HHeight / 2 < HHeight))
H[(p + HHeight / 2) * HWidth + o + HWidth / 2]++;
}
}
}
Max = 0;
for (i = -HHeight / 2; i <= HHeight / 2; i++)
for (j = -10; j <= 10; j++)
{
if (Max < H[(i + HHeight / 2) * HWidth + j + HWidth / 2])
{
Max = H[(i + HHeight / 2) * HWidth + j + HWidth / 2];
o = j;
p = i;
}
}
pAngle.VAngle = o;
break;
default:
return 0;
}
return 1;
}
