private void YCbCrToRGB()
{
progressLabel.Text = "Converting ycbcr to rgb...";
progressLabel.Visible = true;
progressBar.Value = 0;
progressBar.Visible = true;
// needed to update UI
this.Update();
for (int i = 0; i < tempImages.Length; i++)
{
Bitmap bitmap = new Bitmap(tempImages[i].width, tempImages[i].height);
for (int x = 0; x < tempImages[i].width; x++)
{
for (int y = 0; y < tempImages[i].height; y++)
{
// Color conversion values from
// https://www.renesas.com/eu/en/www/doc/application-note/an9717.pdf
YCbCrPixel pixel = tempImages[i].GetPixel(x, y);
int r = (int)(1.164 * (pixel.getY() - 16) + 1.596 * (pixel.getCr() - 128));
int g = (int)(1.164 * (pixel.getY() - 16) - 0.813 * (pixel.getCr() - 128) - 0.392 * (pixel.getCb() - 128));
int b = (int)(1.164 * (pixel.getY() - 16) + 2.017 * (pixel.getCb() - 128));
// safety mechanism
getValidRGBValue(r, out r);
getValidRGBValue(g, out g);
getValidRGBValue(b, out b);
Color color = Color.FromArgb(r, g, b);
bitmap.SetPixel(x, y, color);
}
}
outputImages[i] = bitmap;
progressBar.Value = i;
if (i % keyFrameEvery == 0)
{
GC.Collect();
}
}
progressLabel.Visible = false;
progressBar.Visible = false;
// needed to update UI
this.Update();
}
//create a matrix containing only Y, Cb or Cr values
public double[,] FillValueMatrix(YCbCrImage image, String channelString)
{
double[,] valueMatrix = null;
// only save every Nth pixel depending on subsampling mode / channel string
if (subsamplingMode == "4:4:4" || channelString == "Y")
{
valueMatrix = new double[image.width, image.height];
for (int height = 0; height < image.height; height++)
{
for (int width = 0; width < image.width; width++)
{
YCbCrPixel pixel = image.GetPixel(width, height);
switch (channelString)
{
case "Y":
valueMatrix[width, height] = pixel.getY();
break;
case "Cb":
valueMatrix[width, height] = pixel.getCb();
break;
case "Cr":
valueMatrix[width, height] = pixel.getCr();
break;
default:
break;
}
}
}
}
else if (subsamplingMode == "4:2:2")
{
valueMatrix = new double[image.width / 2, image.height];
for (int height = 0; height < image.height; height++)
{
for (int width = 0; width < image.width; width += 2)
{
YCbCrPixel pixel = image.GetPixel(width, height);
switch (channelString)
{
case "Cb":
valueMatrix[width / 2, height] = pixel.getCb();
break;
case "Cr":
valueMatrix[width / 2, height] = pixel.getCr();
break;
default:
break;
}
}
}
}
else if (subsamplingMode == "4:2:0")
{
valueMatrix = new double[image.width / 2, image.height / 2];
for (int height = 0; height < image.height; height += 2)
{
for (int width = 0; width < image.width; width += 2)
{
YCbCrPixel pixel = image.GetPixel(width, height);
switch (channelString)
{
case "Cb":
valueMatrix[width / 2, height / 2] = pixel.getCb();
break;
case "Cr":
valueMatrix[width / 2, height / 2] = pixel.getCr();
break;
default:
break;
}
}
}
}
return(valueMatrix);
}
