/// <summary>
/// 將每點像素色彩轉換成灰階值
/// </summary>
public void ConvertGrayByPixels(int mode = 0)
{
if (mode == 0)
{
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
int grayValue = GetGrayValue(BmpSource.GetPixel(j, i));
BmpSource.SetPixel(j, i, Color.FromArgb(grayValue, grayValue, grayValue));
}
}
}
else if (mode == 1)
{
for (int x = 0; x < BmpSource.Width; x++)
{
for (int y = 0; y < BmpSource.Height; y++)
{
Color color = BmpSource.GetPixel(x, y);
int gray = (color.R + color.G + color.B) / 3;
BmpSource.SetPixel(x, y, Color.FromArgb(gray, gray, gray));
}
}
}
}
/// <summary>
/// 轉換圖片有效範圍
/// </summary>
/// <param name="pCharsCount">int-字元數量</param>
public void ConvertBmpValidRange(int pCharsCount)
{
// 圖片最大 X, Y，處理後變成起始 X, Y
int posX1 = BmpSource.Width, posY1 = BmpSource.Height;
// 圖片起始 X, Y，處理後變成最大 X, Y
int posX2 = 0, posY2 = 0;
// 取得有效範圍區域
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
int pixelVal = BmpSource.GetPixel(j, i).R;
if (pixelVal < GrayValue) // 如像該素值低於指定灰階值則進行縮小區域
{
if (posX1 > j)
{
posX1 = j; // 如 X2 像素位置大於圖片寬度則縮小寬度
}
if (posY1 > i)
{
posY1 = i; // 如 Y2 像素位置大於圖片高度則縮小高度
}
if (posX2 < j)
{
posX2 = j; // 如 X1 像素位置小於圖片寬度則縮小寬度
}
if (posY2 < i)
{
posY2 = i; // 如 Y1 像素位置小於圖片寬度則縮小寬度
}
}
}
}
// 確保圖片可以平均切割圖片
int span = pCharsCount - (posX2 - posX1 + 1) % pCharsCount;
if (span < pCharsCount)
{
int leftSpan = span / 2;
if (posX1 > leftSpan)
{
posX1 = posX1 - leftSpan;
}
if (posX2 + span - leftSpan < BmpSource.Width)
{
posX2 = posX2 + span - leftSpan;
}
}
// 產生變更後的圖片
Rectangle cloneRect = new Rectangle(posX1, posY1, posX2 - posX1 + 1, posY2 - posY1 + 1);
BmpSource = BmpSource.Clone(cloneRect, BmpSource.PixelFormat);
}
/// <summary>
/// 將每點像素色彩轉換成相反顏色
/// </summary>
public void InvertColorByPixels()
{
for (int x = 0; x < BmpSource.Width; x++)
{
for (int y = 0; y < BmpSource.Height; y++)
{
Color color = BmpSource.GetPixel(x, y);
BmpSource.SetPixel(x, y, Color.FromArgb(255 - color.R, 255 - color.G, 255 - color.B));
}
}
}
/// <summary>
/// 清除邊框處理
/// </summary>
/// <param name="borderWidth"></param>
public void ClearPictureBorder(int pBorderWidth)
{
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
if (i < pBorderWidth || j < pBorderWidth || j > BmpSource.Width - 1 - pBorderWidth || i > BmpSource.Height - 1 - pBorderWidth)
{
BmpSource.SetPixel(j, i, Color.FromArgb(255, 255, 255));
}
}
}
}
/// <summary>
/// 噪音線處理
/// </summary>
public void RemoteNoiseLineByPixels()
{
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
int grayValue = BmpSource.GetPixel(j, i).R;
if (grayValue <= 255 && grayValue >= 160)
{
BmpSource.SetPixel(j, i, Color.FromArgb(255, 255, 255));
}
}
}
}
/// <summary>
/// 將每點像素色彩對比調整
/// </summary>
public void ConvertGrayToBlackByPixels(int value = 160)
{
for (int x = 0; x < BmpSource.Width; x++)
{
for (int y = 0; y < BmpSource.Height; y++)
{
Color color = BmpSource.GetPixel(x, y);
if (color.R < value || color.G < value || color.B < value)
{
BmpSource.SetPixel(x, y, Color.FromArgb(0, 0, 0));
}
else
{
BmpSource.SetPixel(x, y, Color.FromArgb(255, 255, 255));
}
}
}
}
/// <summary>
/// 切割圖片成指定目標數
/// </summary>
/// <param name="pHorizontalColNumber">int-水平切割數</param>
/// <param name="pVerticalRowNumber">int-垂直切割數</param>
/// <returns></returns>
public Bitmap[] GetSplitPicChars(int pHorizontalColNumber, int pVerticalRowNumber)
{
if (pHorizontalColNumber == 0 || pVerticalRowNumber == 0)
{
return(null);
}
int avgWidth = BmpSource.Width / pHorizontalColNumber;
int avgHeight = BmpSource.Height / pVerticalRowNumber;
// 產生存放圖片容器陣列
Bitmap[] bmpAry = new Bitmap[pHorizontalColNumber * pVerticalRowNumber];
// 重新取得數字區域
Rectangle cloneRect;
for (int i = 0; i < pVerticalRowNumber; i++)
{
for (int j = 0; j < pHorizontalColNumber; j++)
{
cloneRect = new Rectangle(j * avgWidth, i * avgHeight, avgWidth, avgHeight);
bmpAry[i * pHorizontalColNumber + j] = BmpSource.Clone(cloneRect, BmpSource.PixelFormat);
}
}
return(bmpAry);
}
/// <summary>
/// 噪音點處理
/// </summary>
public void RemoteNoisePointByPixels()
{
List <NoisePoint> points = new List <NoisePoint>();
for (int k = 0; k < 5; k++)
{
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
int flag = 0;
int garyVal = 255;
// 檢查上相鄰像素
if (i - 1 > 0 && BmpSource.GetPixel(j, i - 1).R != garyVal)
{
flag++;
}
if (i + 1 < BmpSource.Height && BmpSource.GetPixel(j, i + 1).R != garyVal)
{
flag++;
}
if (j - 1 > 0 && BmpSource.GetPixel(j - 1, i).R != garyVal)
{
flag++;
}
if (j + 1 < BmpSource.Width && BmpSource.GetPixel(j + 1, i).R != garyVal)
{
flag++;
}
if (i - 1 > 0 && j - 1 > 0 && BmpSource.GetPixel(j - 1, i - 1).R != garyVal)
{
flag++;
}
if (i + 1 < BmpSource.Height && j - 1 > 0 && BmpSource.GetPixel(j - 1, i + 1).R != garyVal)
{
flag++;
}
if (i - 1 > 0 && j + 1 < BmpSource.Width && BmpSource.GetPixel(j + 1, i - 1).R != garyVal)
{
flag++;
}
if (i + 1 < BmpSource.Height && j + 1 < BmpSource.Width && BmpSource.GetPixel(j + 1, i + 1).R != garyVal)
{
flag++;
}
if (flag < 3)
{
points.Add(new NoisePoint()
{
X = j, Y = i
});
}
}
}
foreach (NoisePoint point in points)
{
BmpSource.SetPixel(point.X, point.Y, Color.FromArgb(255, 255, 255));
}
}
}
