// RGB2YIQ
public CustomImage <YIQPixel> RGB2YIQ(Color[][] RGBImage, bool normalize = true)
{
CustomImage <YIQPixel> image = new CustomImage <YIQPixel>
{
Width = RGBImage[0].Length,
Height = RGBImage[1].Length
};
List <YIQPixel> pixels = new List <YIQPixel>();
for (int i = 0; i < RGBImage[0].Length; i++)
{
for (int j = 0; j < RGBImage[1].Length; j++)
{
// Normalize each pixel value
float NR, NG, NB;
NR = normalize ? RGBImage[i][j].R / 255.00F : RGBImage[i][j].R;
NG = normalize ? RGBImage[i][j].G / 255.00F : RGBImage[i][j].G;
NB = normalize ? RGBImage[i][j].B / 255.00F : RGBImage[i][j].B;
YIQPixel Pixel = new YIQPixel()
{
Xpos = i,
Ypos = j,
Y = NR * W_RGB2YIQ[0, 0] + NG * W_RGB2YIQ[0, 1] + NB * W_RGB2YIQ[0, 2],
I = NR * W_RGB2YIQ[1, 0] + NG * W_RGB2YIQ[1, 1] + NB * W_RGB2YIQ[1, 2],
Q = NR * W_RGB2YIQ[2, 0] + NG * W_RGB2YIQ[2, 1] + NB * W_RGB2YIQ[2, 2]
};
pixels.Add(Pixel);
}
}
image.Pixels = pixels;
return(image);
}
public CustomImage <RGBPixel> LumaChrominance(CustomImage <YIQPixel> YIQImage, float alpha = 1.0F, float beta = 1.0F)
{
CustomImage <YIQPixel> result = new CustomImage <YIQPixel>
{
Width = YIQImage.Width,
Height = YIQImage.Height
};
List <YIQPixel> pixels = new List <YIQPixel>();
foreach (var pixel in YIQImage.Pixels)
{
YIQPixel YIQModPixel = new YIQPixel
{
Xpos = pixel.Xpos,
Ypos = pixel.Ypos,
Y = ValidateYIQ(pixel.Y * alpha, 0F, 1F),
I = ValidateYIQ(pixel.I * beta, -0.5957F, 0.5957F),
Q = ValidateYIQ(pixel.Q * beta, -0.5226F, 0.5226F)
};
pixels.Add(YIQModPixel);
}
result.Pixels = pixels;
return(YIQ2RGB(result));
}
public CustomImage <RGBPixel> LumaFilter(CustomImage <YIQPixel> YIQImage, string filter, float min = 0.2F, float max = 0.8F)
{
CustomImage <YIQPixel> result = new CustomImage <YIQPixel>
{
Width = YIQImage.Width,
Height = YIQImage.Height
};
List <YIQPixel> pixels = new List <YIQPixel>();
foreach (var pixel in YIQImage.Pixels)
{
YIQPixel YIQModPixel = new YIQPixel
{
Xpos = pixel.Xpos,
Ypos = pixel.Ypos,
I = ValidateYIQ(pixel.I, -0.5957F, 0.5957F),
Q = ValidateYIQ(pixel.Q, -0.5226F, 0.5226F)
};
switch (filter)
{
case "Raíz":
YIQModPixel.Y = ValidateYIQ((float)Math.Sqrt(pixel.Y), 0, 1);
break;
case "Cuadrado":
YIQModPixel.Y = ValidateYIQ((float)Math.Pow(pixel.Y, 2), 0, 1);
break;
case "Lineal a trozos":
float n = min / (1 - min);
float m = (1 + n) * max;
float Y = m * pixel.Y - n;
YIQModPixel.Y = ValidateYIQ(Y, 0, 1);
break;
}
pixels.Add(YIQModPixel);
}
result.Pixels = pixels;
return(YIQ2RGB(result));
}
