/// <summary>
/// Dilate and erode morphological filters.
/// </summary>
/// <param name="sourceBitmap">Source image</param>
/// <param name="matrixSize">Size of the matrix</param>
/// <param name="morphType">Morphology type</param>
/// <param name="applyBlue">Apply a color blue</param>
/// <param name="applyGreen">Apply a color green</param>
/// <param name="applyRed">Apply a color red</param>
/// <param name="edgeType">Sets the edge type</param>
/// <returns></returns>
public static Bitmap DilateAndErodeFilter(this Bitmap sourceBitmap,
int matrixSize,
MorphologyType morphType,
bool applyBlue = true,
bool applyGreen = true,
bool applyRed = true,
MorphologyEdgeType edgeType =
MorphologyEdgeType.None)
{
BitmapData sourceData =
sourceBitmap.LockBits(new Rectangle(0, 0,
sourceBitmap.Width, sourceBitmap.Height),
ImageLockMode.ReadOnly,
PixelFormat.Format32bppArgb);
byte[] pixelBuffer = new byte[sourceData.Stride *
sourceData.Height];
byte[] resultBuffer = new byte[sourceData.Stride *
sourceData.Height];
Marshal.Copy(sourceData.Scan0, pixelBuffer, 0,
pixelBuffer.Length);
sourceBitmap.UnlockBits(sourceData);
int filterOffset = (matrixSize - 1) / 2;
int calcOffset = 0;
int byteOffset = 0;
int blue = 0;
int green = 0;
int red = 0;
byte morphResetValue = 0;
if (morphType == MorphologyType.Erosion)
{
morphResetValue = 255;
}
for (int offsetY = filterOffset; offsetY <
sourceBitmap.Height - filterOffset; offsetY++)
{
for (int offsetX = filterOffset; offsetX <
sourceBitmap.Width - filterOffset; offsetX++)
{
byteOffset = offsetY *
sourceData.Stride +
offsetX * 4;
blue = morphResetValue;
green = morphResetValue;
red = morphResetValue;
if (morphType == MorphologyType.Dilation)
{
for (int filterY = -filterOffset;
filterY <= filterOffset; filterY++)
{
for (int filterX = -filterOffset;
filterX <= filterOffset; filterX++)
{
calcOffset = byteOffset +
(filterX * 4) +
(filterY * sourceData.Stride);
if (pixelBuffer[calcOffset] > blue)
{
blue = pixelBuffer[calcOffset];
}
if (pixelBuffer[calcOffset + 1] > green)
{
green = pixelBuffer[calcOffset + 1];
}
if (pixelBuffer[calcOffset + 2] > red)
{
red = pixelBuffer[calcOffset + 2];
}
}
}
}
else if (morphType == MorphologyType.Erosion)
{
for (int filterY = -filterOffset;
filterY <= filterOffset; filterY++)
{
for (int filterX = -filterOffset;
filterX <= filterOffset; filterX++)
{
calcOffset = byteOffset +
(filterX * 4) +
(filterY * sourceData.Stride);
if (pixelBuffer[calcOffset] < blue)
{
blue = pixelBuffer[calcOffset];
}
if (pixelBuffer[calcOffset + 1] < green)
{
green = pixelBuffer[calcOffset + 1];
}
if (pixelBuffer[calcOffset + 2] < red)
{
red = pixelBuffer[calcOffset + 2];
}
}
}
}
if (applyBlue == false)
{
blue = pixelBuffer[byteOffset];
}
if (applyGreen == false)
{
green = pixelBuffer[byteOffset + 1];
}
if (applyRed == false)
{
red = pixelBuffer[byteOffset + 2];
}
if (edgeType == MorphologyEdgeType.EdgeDetection)
{
if (morphType == MorphologyType.Dilation)
{
blue = blue - pixelBuffer[byteOffset];
green = green - pixelBuffer[byteOffset + 1];
red = red - pixelBuffer[byteOffset + 2];
}
else if (morphType == MorphologyType.Erosion)
{
blue = pixelBuffer[byteOffset] - blue;
green = pixelBuffer[byteOffset + 1] - green;
red = pixelBuffer[byteOffset + 2] - red;
}
}
blue = (blue > 255 ? 255 : (blue < 0 ? 0 : blue));
green = (green > 255 ? 255 : (green < 0 ? 0 : green));
red = (red > 255 ? 255 : (red < 0 ? 0 : red));
resultBuffer[byteOffset] = (byte)blue;
resultBuffer[byteOffset + 1] = (byte)green;
resultBuffer[byteOffset + 2] = (byte)red;
resultBuffer[byteOffset + 3] = 255;
}
}
Bitmap resultBitmap = new 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>
/// Dilate And Erode Filter
/// </summary>
/// <param name="sourceBitmap">Set source Bitmap</param>
/// <param name="matrixSize">Set matrix size</param>
/// <param name="morphType">Set Morphology Type</param>
/// <param name="applyBlue">Apply Blue</param>
/// <param name="applyGreen">Apply Green</param>
/// <param name="applyRed">Apply Red</param>
/// <param name="edgeType">Morphology Edge Type</param>
/// <returns></returns>
public static System.Drawing.Bitmap DilateAndErodeFilter(this System.Drawing.Bitmap sourceBitmap,
int matrixSize,
MorphologyType morphType,
bool applyBlue = true,
bool applyGreen = true,
bool applyRed = true,
MorphologyEdgeType edgeType =
MorphologyEdgeType.None)
{
BitmapData sourceData =
sourceBitmap.LockBits(new Rectangle(0, 0,
sourceBitmap.Width, sourceBitmap.Height),
ImageLockMode.ReadOnly,
PixelFormat.Format32bppArgb);
byte[] pixelBuffer = new byte[sourceData.Stride *
sourceData.Height];
byte[] resultBuffer = new byte[sourceData.Stride *
sourceData.Height];
Marshal.Copy(sourceData.Scan0, pixelBuffer, 0,
pixelBuffer.Length);
sourceBitmap.UnlockBits(sourceData);
int filterOffset = (matrixSize - 1) / 2;
int calcOffset = 0;
int byteOffset = 0;
int blue = 0;
int green = 0;
int red = 0;
byte morphResetValue = 0;
if (morphType == MorphologyType.Erosion)
{
morphResetValue = 255;
}
for (int offsetY = filterOffset; offsetY <
sourceBitmap.Height - filterOffset; offsetY++)
{
for (int offsetX = filterOffset; offsetX <
sourceBitmap.Width - filterOffset; offsetX++)
{
byteOffset = offsetY *
sourceData.Stride +
offsetX * 4;
blue = morphResetValue;
green = morphResetValue;
red = morphResetValue;
if (morphType == MorphologyType.Dilation)
{
for (int filterY = -filterOffset;
filterY <= filterOffset; filterY++)
{
for (int filterX = -filterOffset;
filterX <= filterOffset; filterX++)
{
calcOffset = byteOffset +
(filterX * 4) +
(filterY * sourceData.Stride);
if (pixelBuffer[calcOffset] > blue)
{
blue = pixelBuffer[calcOffset];
}
if (pixelBuffer[calcOffset + 1] > green)
{
green = pixelBuffer[calcOffset + 1];
}
if (pixelBuffer[calcOffset + 2] > red)
{
red = pixelBuffer[calcOffset + 2];
}
}
}
}
else if (morphType == MorphologyType.Erosion)
{
for (int filterY = -filterOffset;
filterY <= filterOffset; filterY++)
{
for (int filterX = -filterOffset;
filterX <= filterOffset; filterX++)
{
calcOffset = byteOffset +
(filterX * 4) +
(filterY * sourceData.Stride);
if (pixelBuffer[calcOffset] < blue)
{
blue = pixelBuffer[calcOffset];
}
if (pixelBuffer[calcOffset + 1] < green)
{
green = pixelBuffer[calcOffset + 1];
}
if (pixelBuffer[calcOffset + 2] < red)
{
red = pixelBuffer[calcOffset + 2];
}
}
}
}
if (applyBlue == false)
{
blue = pixelBuffer[byteOffset];
}
if (applyGreen == false)
{
green = pixelBuffer[byteOffset + 1];
}
if (applyRed == false)
{
red = pixelBuffer[byteOffset + 2];
}
if (edgeType == MorphologyEdgeType.EdgeDetection ||
edgeType == MorphologyEdgeType.SharpenEdgeDetection)
{
if (morphType == MorphologyType.Dilation)
{
blue = blue - pixelBuffer[byteOffset];
green = green - pixelBuffer[byteOffset + 1];
red = red - pixelBuffer[byteOffset + 2];
}
else if (morphType == MorphologyType.Erosion)
{
blue = pixelBuffer[byteOffset] - blue;
green = pixelBuffer[byteOffset + 1] - green;
red = pixelBuffer[byteOffset + 2] - red;
}
if (edgeType == MorphologyEdgeType.SharpenEdgeDetection)
{
blue += pixelBuffer[byteOffset];
green += pixelBuffer[byteOffset + 1];
red += pixelBuffer[byteOffset + 2];
}
}
blue = (blue > 255 ? 255 : (blue < 0 ? 0 : blue));
green = (green > 255 ? 255 : (green < 0 ? 0 : green));
red = (red > 255 ? 255 : (red < 0 ? 0 : red));
resultBuffer[byteOffset] = (byte)blue;
resultBuffer[byteOffset + 1] = (byte)green;
resultBuffer[byteOffset + 2] = (byte)red;
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>
/// Erosion filter
/// </summary>
/// <param name="image">The image.</param>
/// <param name="matrixSize">Size of the matrix.</param>
/// <param name="applyBlue">if set to <c>true</c> [apply blue].</param>
/// <param name="applyGreen">if set to <c>true</c> [apply green].</param>
/// <param name="applyRed">if set to <c>true</c> [apply red].</param>
/// <param name="edgeType">Type of the edge.</param>
/// <returns>Image.</returns>
public static Image Erosion(this Image image, int matrixSize, bool applyBlue = true, bool applyGreen = true, bool applyRed = true, MorphologyEdgeType edgeType = MorphologyEdgeType.None)
{
ImageFilter imageFilter = new ImageFilter();
return imageFilter.DilateAndErodeFilter(new Bitmap(image), matrixSize, MorphologyType.Erosion, applyBlue, applyGreen, applyRed, edgeType);
}
