private static void DoApplyWavelet(double[,] channel, WaveletParameters waveletParameters)
{
var lowerCoefs = GetCoefsByWaveletType(waveletParameters.WaveletType);
var higherCoefs = GetHighPassFilter(lowerCoefs);
var height = channel.GetLength(0);
var width = channel.GetLength(1);
var result = new double[height, width];
for (var counter = 0; counter < waveletParameters.IterationsCount; ++counter)
{
var line = new double[width];
for (var i = 0; i < height; ++i)
{
for (var j = 0; j < width; ++j)
{
line[j] = channel[i, j];
}
var resultLine = PairConvolution(line, lowerCoefs, higherCoefs);
for (var j = 0; j < width; ++j)
{
result[i, j] = resultLine[j];
}
}
line = new double[height];
for (var j = 0; j < width; ++j)
{
for (var i = 0; i < height; ++i)
{
line[i] = result[i, j];
}
var resultLine = PairConvolution(line, lowerCoefs, higherCoefs);
for (var i = 0; i < height; ++i)
{
result[i, j] = resultLine[i];
}
}
for (var i = 0; i < height; ++i)
{
for (var j = 0; j < width; ++j)
{
channel[i % 2 == 0 ? i / 2 : height / 2 + i / 2, j % 2 == 0 ? j / 2 : width / 2 + j / 2] = result[i, j];
}
}
height >>= 1;
width >>= 1;
}
height = channel.GetLength(0);
width = channel.GetLength(1);
for (var i = 0; i < height; ++i)
{
for (var j = 0; j < width; ++j)
{
channel[i, j] = Math.Abs(channel[i, j]) < waveletParameters.Threshold ? 0.0 : channel[i, j] * 255.0;
}
}
}
private static void SaveWavelet(BitmapSource bitmap, WaveletParameters parameters, Vector <double[, ]> channels)
{
using (var outputStream = File.Open(parameters.SavePath, FileMode.Create))
using (var encodeStream = new LzmaEncodeStream(outputStream))
using (var writer = new BinaryWriter(encodeStream))
{
writer.Write(bitmap.PixelHeight);
writer.Write(bitmap.PixelWidth);
writer.Write(bitmap.DpiX);
writer.Write(bitmap.DpiY);
writer.Write((byte)parameters.WaveletType);
writer.Write(parameters.IterationsCount);
writer.Write(channels.Length);
for (var i = 0; i < channels.Length; ++i)
{
WriteChannel(writer, channels[i]);
}
}
}
public static BitmapSource ApplyWavelet(BitmapSource bitmap, WaveletParameters waveletParameters)
{
if (bitmap.Format != PixelFormats.Gray8)
{
var colors = bitmap.GetColors();
//var yCrCb = Transformation.RGBToYCbCr(colors);
var channels = GetChannels(colors, bitmap.PixelHeight, bitmap.PixelWidth);
for (var channel = 0; channel < 3; ++channel)
{
DoApplyWavelet(channels[channel], waveletParameters);
}
SaveWavelet(bitmap, waveletParameters, channels);
return(bitmap.Create(ToColors(channels)));
}
var bytes = bitmap.GetBytes();
var channl = GetChannel(bytes, bitmap.PixelHeight, bitmap.PixelWidth);
DoApplyWavelet(channl, waveletParameters);
SaveWavelet(bitmap, waveletParameters, new Vector <double[, ]>(new[] { channl }));
return(bitmap.Create(ToGrey(channl)));
}
