public static YCbCrPixel Convert(RgbPixel rgb)
{
var yChannel = 0.299 * rgb.R + 0.587 * rgb.G + 0.114 * rgb.B;
var cbChannel = -0.168935 * rgb.R - 0.331665 * rgb.G + 0.50059 * rgb.B;
var crChannel = 0.499813 * rgb.R - 0.418531 * rgb.G - 0.081282 * rgb.B;
var yCbCr = new YCbCrPixel(yChannel, cbChannel, crChannel);
return(yCbCr);
}
public void DecodeImage(IDownSampler downSampler, QuantizeMethod quantizeMethod, int quantizeParameter)
{
GetQuantizeds(quantizeMethod, quantizeParameter, out var quantizedY, out var quantizedCb, out var quantizedCr);
var iQuantizedY = new double[256, 256];
var iQuantizedCb = new double[128, 128];
var iQuantizedCr = new double[128, 128];
if (quantizeMethod == QuantizeMethod.ZigZag)
{
iQuantizedY = quantizedY.GetIQuantizeUsingZigZagMethod(quantizeParameter);
iQuantizedCb = quantizedCb.GetIQuantizeUsingZigZagMethod(quantizeParameter);
iQuantizedCr = quantizedCr.GetIQuantizeUsingZigZagMethod(quantizeParameter);
}
if (quantizeMethod == QuantizeMethod.Method2)
{
iQuantizedY = quantizedY.GetIQuantizeUsingMethod2(quantizeParameter);
iQuantizedCb = quantizedCb.GetIQuantizeUsingMethod2(quantizeParameter);
iQuantizedCr = quantizedCr.GetIQuantizeUsingMethod2(quantizeParameter);
}
if (quantizeMethod == QuantizeMethod.JpegQuality)
{
iQuantizedY = quantizedY.GetIQuantizeUsingJpegQualityMethod(quantizeParameter);
iQuantizedCb = quantizedCb.GetIQuantizeUsingJpegQualityMethod(quantizeParameter);
iQuantizedCr = quantizedCr.GetIQuantizeUsingJpegQualityMethod(quantizeParameter);
}
var iDctY = dct.GetIDiscreteCosineTransform(iQuantizedY);
var iDctCb = dct.GetIDiscreteCosineTransform(iQuantizedCb);
var iDctCr = dct.GetIDiscreteCosineTransform(iQuantizedCr);
var upSampledCb = downSampler.GetUpSampledMatrix(iDctCb);
var upSampledCr = downSampler.GetUpSampledMatrix(iDctCr);
var yCbCrPixels = new YCbCrPixel[256, 256];
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
yCbCrPixels[i, j] = new YCbCrPixel
{
Y = (byte)iDctY[i, j],
Cb = (byte)upSampledCb[i, j],
Cr = (byte)upSampledCr[i, j]
};
}
}
ReconstructedImage = GetBitmapFromYCbCrPixels(yCbCrPixels);
}
private YCbCrPixel[,] GetYCbCrPixelsFromImage(Bitmap image)
{
var pixels = new YCbCrPixel[256, 256];
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
pixels[i, j] = pixelMapper.GetYCbCrPixelFromRgb(image.GetPixel(i, j));
}
}
return(pixels);
}
public static YCbCrPixel[,] Convert(RgbPixel[,] matrix)
{
var height = matrix.GetLength(0);
var width = matrix.GetLength(1);
var convertedMatrix = new YCbCrPixel[height, width];
for (var i = 0; i < height; i++)
{
for (var j = 0; j < width; j++)
{
convertedMatrix[i, j] = RgbToYCbCrConverter.Convert(matrix[i, j]);
}
}
return(convertedMatrix);
}
public Color GetRgbFromYCbCrPixel(YCbCrPixel yCbCrPixel)
{
//var red = yCbCrPixel.Y + 0.000 * (yCbCrPixel.Cb - 128) + 1.371 * (yCbCrPixel.Cr - 128);
//var green = yCbCrPixel.Y - 0.336 * (yCbCrPixel.Cb - 128) - 0.698 * (yCbCrPixel.Cr - 128);
//var blue = yCbCrPixel.Y + 1.732 * (yCbCrPixel.Cb - 128) + 0.000 * (yCbCrPixel.Cr - 128);
var red = yCbCrPixel.Y + 1.402 * (yCbCrPixel.Cr - 128);
var green = yCbCrPixel.Y - 0.344136 * (yCbCrPixel.Cb - 128) - 0.714136 * (yCbCrPixel.Cr - 128);
var blue = yCbCrPixel.Y + 1.772 * (yCbCrPixel.Cb - 128);
var normalizedRed = Normalize(red, 0, 255);
var normalizedGreen = Normalize(green, 0, 255);
var normalizedBlue = Normalize(blue, 0, 255);
return(Color.FromArgb(normalizedRed, normalizedGreen, normalizedBlue));
}
