private void GetQuantizeds(QuantizeMethod quantizeMethod, int quantizeParameter, out double[,] quantizedY, out double[,] quantizedCb, out double[,] quantizedCr)
{
quantizedY = new double[256, 256];
quantizedCb = new double[128, 128];
quantizedCr = new double[128, 128];
if (quantizeMethod == QuantizeMethod.ZigZag)
{
quantizedY = DctY.GetQuantizeUsingZigZagMethod(quantizeParameter);
quantizedCb = DctCb.GetQuantizeUsingZigZagMethod(quantizeParameter);
quantizedCr = DctCr.GetQuantizeUsingZigZagMethod(quantizeParameter);
}
if (quantizeMethod == QuantizeMethod.Method2)
{
quantizedY = DctY.GetQuantizeUsingMethod2(quantizeParameter);
quantizedCb = DctCb.GetQuantizeUsingMethod2(quantizeParameter);
quantizedCr = DctCr.GetQuantizeUsingMethod2(quantizeParameter);
}
if (quantizeMethod == QuantizeMethod.JpegQuality)
{
quantizedY = DctY.GetQuantizeUsingJpegQualityMethod(quantizeParameter);
quantizedCb = DctCb.GetQuantizeUsingJpegQualityMethod(quantizeParameter);
quantizedCr = DctCr.GetQuantizeUsingJpegQualityMethod(quantizeParameter);
}
}
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 void buttonLast4Steps_Click(object sender, EventArgs e)
{
QuantizeMethod quantizeMethod = QuantizeMethod.Method2;
int quantizeParameter = 0;
if (radioButtonMethod2.Checked)
{
quantizeMethod = QuantizeMethod.Method2;
quantizeParameter = (int)numericUpDownR.Value;
}
if (radioButtonJpegQ.Checked)
{
quantizeMethod = QuantizeMethod.JpegQuality;
quantizeParameter = (int)numericUpDownJpeg.Value;
}
jpegEncoder.DecodeImage(new DownSampler411(), quantizeMethod, quantizeParameter);
pictureBoxDecodedImage.Image = jpegEncoder.ReconstructedImage;
}