/// <summary>
/// Average Color Filter
/// </summary>
/// <param name="sourceBitmap">Set source Bitmap</param>
/// <param name="matrixSize">Set matrix size</param>
/// <param name="applyBlue">Apply Blue</param>
/// <param name="applyGreen">Apply Green</param>
/// <param name="applyRed">Apply Red</param>
/// <param name="shiftType">Set shift type</param>
/// <returns></returns>
public static System.Drawing.Bitmap AverageColoursFilter(this System.Drawing.Bitmap sourceBitmap,
int matrixSize,
bool applyBlue = true,
bool applyGreen = true,
bool applyRed = true,
ColorShiftType shiftType =
ColorShiftType.None)
{
byte[] pixelBuffer = sourceBitmap.GETByteArray();
byte[] resultBuffer = new byte[pixelBuffer.Length];
int calcOffset = 0;
int byteOffset = 0;
int blue = 0; int green = 0; int red = 0;
int filterOffset = (matrixSize - 1) / 2;
for (int offsetY = filterOffset; offsetY <
sourceBitmap.Height - filterOffset; offsetY++)
{
for (int offsetX = filterOffset; offsetX <
sourceBitmap.Width - filterOffset; offsetX++)
{
byteOffset = offsetY * sourceBitmap.Width * 4 +
offsetX * 4;
blue = 0; green = 0; red = 0;
for (int filterY = -filterOffset;
filterY <= filterOffset; filterY++)
{
for (int filterX = -filterOffset;
filterX <= filterOffset; filterX++)
{
calcOffset = byteOffset +
(filterX * 4) +
(filterY * sourceBitmap.Width * 4);
blue += pixelBuffer[calcOffset];
green += pixelBuffer[calcOffset + 1];
red += pixelBuffer[calcOffset + 2];
}
}
blue = blue / matrixSize;
green = green / matrixSize;
red = red / matrixSize;
if (applyBlue == false)
{
blue = pixelBuffer[byteOffset];
}
if (applyGreen == false)
{
green = pixelBuffer[byteOffset + 1];
}
if (applyRed == false)
{
red = pixelBuffer[byteOffset + 2];
}
if (shiftType == ColorShiftType.None)
{
resultBuffer[byteOffset] = (byte)blue;
resultBuffer[byteOffset + 1] = (byte)green;
resultBuffer[byteOffset + 2] = (byte)red;
resultBuffer[byteOffset + 3] = 255;
}
else if (shiftType == ColorShiftType.ShiftLeft)
{
resultBuffer[byteOffset] = (byte)green;
resultBuffer[byteOffset + 1] = (byte)red;
resultBuffer[byteOffset + 2] = (byte)blue;
resultBuffer[byteOffset + 3] = 255;
}
else if (shiftType == ColorShiftType.ShiftRight)
{
resultBuffer[byteOffset] = (byte)red;
resultBuffer[byteOffset + 1] = (byte)blue;
resultBuffer[byteOffset + 2] = (byte)green;
resultBuffer[byteOffset + 3] = 255;
}
}
}
System.Drawing.Bitmap resultBitmap = new System.Drawing.Bitmap(sourceBitmap.Width,
sourceBitmap.Height);
BitmapData resultData =
resultBitmap.LockBits(new Rectangle(0, 0,
resultBitmap.Width, resultBitmap.Height),
ImageLockMode.WriteOnly,
PixelFormat.Format32bppArgb);
Marshal.Copy(resultBuffer, 0, resultData.Scan0,
resultBuffer.Length);
resultBitmap.UnlockBits(resultData);
return(resultBitmap);
}
/// <summary>
/// Color Filter
/// </summary>
/// <param name="sourceBitmap">Set source Bitmap</param>
/// <param name="matrixSize">Set matrix size</param>
/// <param name="edgeThreshold">Set edge threshold</param>
/// <param name="applyBlue">Apply Blue</param>
/// <param name="applyGreen">Apply Green</param>
/// <param name="applyRed">Apply Red</param>
/// <param name="edgeType">Set edge type</param>
/// <param name="shiftType">Set shift type</param>
/// <returns></returns>
public static System.Drawing.Bitmap AbstractColorsFilter(this System.Drawing.Bitmap sourceBitmap,
int matrixSize,
byte edgeThreshold,
bool applyBlue = true,
bool applyGreen = true,
bool applyRed = true,
EdgeTracingType edgeType =
EdgeTracingType.Black,
ColorShiftType shiftType =
ColorShiftType.None)
{
System.Drawing.Bitmap edgeBitmap =
sourceBitmap.GradientBasedEdgeDetectionFilter(edgeThreshold);
System.Drawing.Bitmap colorBitmap =
sourceBitmap.AverageColoursFilter(matrixSize,
applyBlue, applyGreen, applyRed, shiftType);
byte[] edgeBuffer = edgeBitmap.GETByteArray();
byte[] colorBuffer = colorBitmap.GETByteArray();
byte[] resultBuffer = colorBitmap.GETByteArray();
for (int k = 0; k + 4 < edgeBuffer.Length; k += 4)
{
if (edgeBuffer[k] == 255)
{
switch (edgeType)
{
case EdgeTracingType.Black:
resultBuffer[k] = 0;
resultBuffer[k + 1] = 0;
resultBuffer[k + 2] = 0;
break;
case EdgeTracingType.White:
resultBuffer[k] = 255;
resultBuffer[k + 1] = 255;
resultBuffer[k + 2] = 255;
break;
case EdgeTracingType.HalfIntensity:
resultBuffer[k] = ClipByte(resultBuffer[k] * 0.5);
resultBuffer[k + 1] = ClipByte(resultBuffer[k + 1] * 0.5);
resultBuffer[k + 2] = ClipByte(resultBuffer[k + 2] * 0.5);
break;
case EdgeTracingType.DoubleIntensity:
resultBuffer[k] = ClipByte(resultBuffer[k] * 2);
resultBuffer[k + 1] = ClipByte(resultBuffer[k + 1] * 2);
resultBuffer[k + 2] = ClipByte(resultBuffer[k + 2] * 2);
break;
case EdgeTracingType.ColorInversion:
resultBuffer[k] = ClipByte(255 - resultBuffer[k]);
resultBuffer[k + 1] = ClipByte(255 - resultBuffer[k + 1]);
resultBuffer[k + 2] = ClipByte(255 - resultBuffer[k + 2]);
break;
}
}
}
System.Drawing.Bitmap resultBitmap = new System.Drawing.Bitmap(sourceBitmap.Width,
sourceBitmap.Height);
BitmapData resultData =
resultBitmap.LockBits(new Rectangle(0, 0,
resultBitmap.Width, resultBitmap.Height),
ImageLockMode.WriteOnly,
PixelFormat.Format32bppArgb);
Marshal.Copy(resultBuffer, 0, resultData.Scan0,
resultBuffer.Length);
resultBitmap.UnlockBits(resultData);
return(resultBitmap);
}
