YCrCb rgbToYCbCr(Bitmap img)
{
YCrCb result;
Color color;
byte[,] y = new byte[img.Width, img.Height];
byte[,] cb = new byte[img.Width, img.Height];
byte[,] cr = new byte[img.Width, img.Height];
int R = 0;
int G = 0;
int B = 0;
for (int i = 0; i < img.Width; i++)
{
for (int j = 0; j < img.Height; j++)
{
color = image.GetPixel(i, j);
R = color.R;
G = color.G;
B = color.B;
y[i, j] = (byte)(0 + 0.299 * R + 0.587 * G + 0.114 * B);
cb[i, j] = (byte)(128 - 0.168736 * R - 0.331264 * G + 0.5 * B);
cr[i, j] = (byte)(128 + 0.5 * R - 0.418688 * G - 0.081312 * B);
}
}
result = new YCrCb(y, cb, cr);
return(result);
}
private void dCTToolStripMenuItem_Click(object sender, EventArgs e)
{
double[,] yDCT, CbDCT, CrDCT, yInvQed, CbInvQed, CrInvQed;
byte[,] yQuantized, CbQuantized, CrQuantized, yInvDCT, CbInvDCT, CrInvDCT;
Bitmap result, subsamplebmp;
YCrCb subsampled, desubsampled;
rgbConverted = rgbToYCbCr(image);
subsampled = compress(rgbConverted.Y, rgbConverted.Cb, rgbConverted.Cr);
//subsamplebmp = YCbCrTorgb(subsampled.Y, subsampled.Cb, subsampled.Cr);
//decompressed = decompress(compressed.Y, compressed.Cb, compressed.Cr);
//bmpDecompressed = YCbCrTorgb(decompressed.Y, decompressed.Cb, decompressed.Cr);
yDCT = dctObject.forwardDCT(subsampled.Y);
CbDCT = dctObject.forwardDCT(subsampled.Cb);
CrDCT = dctObject.forwardDCT(subsampled.Cr);
yQuantized = dctObject.quantize(yDCT);
CbQuantized = dctObject.quantize(CbDCT);
CrQuantized = dctObject.quantize(CrDCT);
yInvQed = dctObject.inverseQuantize(yQuantized);
CbInvQed = dctObject.inverseQuantize(CbQuantized);
CrInvQed = dctObject.inverseQuantize(CrQuantized);
yInvDCT = dctObject.inverseDCT(yInvQed);
CbInvDCT = dctObject.inverseDCT(CbInvQed);
CrInvDCT = dctObject.inverseDCT(CrInvQed);
desubsampled = decompress(yInvDCT, CbInvDCT, CrInvDCT);
result = YCbCrTorgb(desubsampled.Y, desubsampled.Cb, desubsampled.Cr);
pictureBox2.Image = result;
}
private void compressionToolStripMenuItem_Click(object sender, EventArgs e)
{
rgbConverted = rgbToYCbCr(image);
compressed = compress(rgbConverted.Y, rgbConverted.Cb, rgbConverted.Cr);
decompressed = decompress(compressed.Y, compressed.Cb, compressed.Cr);
bmpDecompressed = YCbCrTorgb(decompressed.Y, decompressed.Cb, decompressed.Cr);
pictureBox2.Image = bmpDecompressed;
}