protected static BitmapData GetByteDataFromBitmap(Bitmap bitmap)
{
if (bitmap != null)
{
var data = new BitmapData();
var bmData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite,
bitmap.PixelFormat);
try
{
var height = bitmap.Height;
var width = bitmap.Width;
var stride = bmData.Stride;
var bytesPerPixel = Image.GetPixelFormatSize(bitmap.PixelFormat) / 8;
var offset = stride - width * bytesPerPixel;
var totalLength = Math.Abs(stride) * height;
var ptr = bmData.Scan0;
var rgbValues = new byte[totalLength];
Marshal.Copy(ptr, rgbValues, 0, totalLength);
data.UpdateValues(rgbValues, width, height, stride, offset, bytesPerPixel, totalLength);
}
finally
{
bitmap.UnlockBits(bmData);
}
return(data);
}
return(null);
}
protected int MakeConvolutionWithPixel(BitmapData srcData, byte[] dst, int x, int y)
{
double finalX = 0, finalY = 0;
for (var i = 0; i < Kernel1.GetLength(0); i++)
{
for (var j = 0; j < Kernel1.GetLength(1); j++)
{
var posI = y + i - 1;
var posJ = x + j - 1;
var pos = (posI * srcData.Width + posJ) * srcData.BytesPerPixel;
finalX += Kernel1[i, j] * srcData.DataBytes[pos];
if (!UseOnlyFirstKernel)
{
finalY += Kernel2[i, j] * srcData.DataBytes[pos];
}
}
}
var clampedValue = UseOnlyFirstKernel
? (byte)Clamp(Math.Abs(finalX), 0, 255.0)
: (byte)Clamp(Math.Sqrt(finalX * finalX + finalY * finalY), 0, 255.0);
var currentPixelPos = (y * srcData.Width + x) * srcData.BytesPerPixel;
if (clampedValue <= Threshold)
{
dst[currentPixelPos] = Color.Black.R;
dst[currentPixelPos + 1] = Color.Black.G;
dst[currentPixelPos + 2] = Color.Black.B;
}
else
{
dst[currentPixelPos] = Color.White.R;
dst[currentPixelPos + 1] = Color.White.G;
dst[currentPixelPos + 2] = Color.White.B;
}
//dst[currentPixelPos] = clampedValue;
//dst[currentPixelPos + 1] = clampedValue;
//dst[currentPixelPos + 2] = clampedValue;
return(clampedValue > Threshold ? 1 : 0);
}
