public static Bitmap ApplyMedianPassFilter(Bitmap sourceBitmap, eMedianFilterQuality quality)
{
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);
var qualityValue = (int)(quality);
var neighborsOffset = qualityValue / 2;
var mediumValueIndex = (qualityValue * qualityValue + 1) / 2;
for (int imageOffsetX = neighborsOffset; imageOffsetX < sourceBitmap.Height - neighborsOffset; imageOffsetX++)
{
for (int imageOffsetY = neighborsOffset; imageOffsetY < sourceBitmap.Width - neighborsOffset; imageOffsetY++)
{
var centralPixelPos = (sourceData.Stride * imageOffsetX) + (imageOffsetY * BYTES_PER_PIXEL);
var blueValues = new byte[qualityValue * qualityValue];
var greenValues = new byte[qualityValue * qualityValue];
var redValues = new byte[qualityValue * qualityValue];
var posOnArray = 0;
for (int offsetX = -neighborsOffset; offsetX <= neighborsOffset; offsetX++)
{
for (int offsetY = -neighborsOffset; offsetY <= neighborsOffset; offsetY++)
{
var currentPixelPos = (sourceData.Stride * (imageOffsetX + offsetX)) + (offsetY + imageOffsetY) * BYTES_PER_PIXEL;
blueValues[posOnArray] = pixelBuffer[currentPixelPos];
greenValues[posOnArray] = pixelBuffer[currentPixelPos + 1];
redValues[posOnArray] = pixelBuffer[currentPixelPos + 2];
posOnArray++;
}
}
resultBuffer[centralPixelPos] = blueValues.OrderBy(v => v).ElementAt(mediumValueIndex);
resultBuffer[centralPixelPos + 1] = greenValues.OrderBy(v => v).ElementAt(mediumValueIndex);
resultBuffer[centralPixelPos + 2] = redValues.OrderBy(v => v).ElementAt(mediumValueIndex);
resultBuffer[centralPixelPos + 3] = 255;
}
}
return(BitmapHelper.CreateNewBitmapFrom(sourceBitmap, resultBuffer));
}
private void ApplyMedianFilter(eMedianFilterQuality quality)
{
var result = ImageManipulator.ApplyMedianPassFilter(_originalImage, quality);
Image = BitmapHelper.BitmapToBitmapImage(result);
}
