// Increase all pixel's hue with the given degree value
public static Mat IncreaseHueBy(Mat original, double degree)
{
Image <Bgr, byte> image = original.ToImage <Bgr, byte>();
int rows = image.Rows;
int cols = image.Cols;
Bgr color;
for (int row = 0; row < rows; ++row)
{
for (int col = 0; col < cols; ++col)
{
color = image[row, col];
color = HSL.IncreaseHue(color, degree);
image[row, col] = color;
}
}
return(image.Mat);
}
// Increase all pixel's lightness with the given percentage value
public static Mat IncreaseLightnessBy(Mat original, double percentage)
{
Image <Bgr, byte> image = original.ToImage <Bgr, byte>();
int rows = image.Rows;
int cols = image.Cols;
Bgr color;
for (int row = 0; row < rows; ++row)
{
for (int col = 0; col < cols; ++col)
{
color = image[row, col];
color = HSL.IncreaseLightness(color, percentage / 100.0);
image[row, col] = color;
}
}
return(image.Mat);
}
// Convert HSL color to Bgr color
public static Bgr ConvertToBgr(HSL hslColor)
{
int blue = (int)(hslColor.L * 255);
int green = (int)(hslColor.L * 255);
int red = (int)(hslColor.L * 255);
double h = hslColor.H;
double s = hslColor.S;
double l = hslColor.L;
if (hslColor.S != 0)
{
double hue = h / 360;
double v1 = (l < 0.5) ? (l * (1 + s)) : ((l + s) - (l * s));
double v2 = 2 * l - v1;
red = (int)(255 * HueToRgb(v2, v1, hue + (1 / 3.0)));
green = (int)(255 * HueToRgb(v2, v1, hue));
blue = (int)(255 * HueToRgb(v2, v1, hue - (1 / 3.0)));
}
return(new Bgr(blue, green, red));
}
// Stretch images histogram based on the lightness values
public static Image <Bgr, byte> StrectchHistogram(Mat original)
{
Image <Bgr, byte> image = original.ToImage <Bgr, byte>();
double minL;
double maxL;
Bgr color;
int rows = image.Rows;
int cols = image.Cols;
GetMinAndMaxLightness(image, out minL, out maxL);
for (int row = 0; row < rows; ++row)
{
for (int col = 0; col < cols; ++col)
{
color = image[row, col];
image[row, col] = HSL.StretchValue(color, maxL - minL);
}
}
return(image);
}
// Returns the smallest and biggest lightness values from the given image
private static void GetMinAndMaxLightness(Image <Bgr, byte> image, out double min, out double max)
{
double minTemp = double.MaxValue;
double maxTemp = double.MinValue;
double lightness;
int rows = image.Rows;
int cols = image.Cols;
for (int row = 0; row < rows; ++row)
{
for (int col = 0; col < cols; ++col)
{
Bgr color = image[row, col];
lightness = HSL.GetLightness(color);
minTemp = Math.Min(minTemp, lightness);
maxTemp = Math.Max(maxTemp, lightness);
}
}
min = minTemp;
max = maxTemp;
}
