public static async void EqualizeHistogram(this Brush brush)
{
Bh.Initialize(brush);
var histogram = new Histogram((ImageBrush)brush);
var maxPixels = Bh.Width * Bh.Height;
var dystR = HistogramHelper.GetDystrybuanta(histogram.HistogramR, maxPixels);
var dystG = HistogramHelper.GetDystrybuanta(histogram.HistogramG, maxPixels);
var dystB = HistogramHelper.GetDystrybuanta(histogram.HistogramB, maxPixels);
var lutR = HistogramHelper.GetLutEqualization(dystR);
var lutG = HistogramHelper.GetLutEqualization(dystG);
var lutB = HistogramHelper.GetLutEqualization(dystB);
for (var i = 0; i < Bh.Length; i += 4)
{
var rValue = Bh.Pixels[i + 2];
var gValue = Bh.Pixels[i + 1];
var bValue = Bh.Pixels[i];
Bh.Pixels[i + 2] = (byte)lutR[rValue];
Bh.Pixels[i + 1] = (byte)lutG[gValue];
Bh.Pixels[i] = (byte)lutB[bValue];
}
await Bh.UpdateBrush();
}
public static bool IsGrayscaled(this Brush brush)
{
Bh.Initialize(brush);
for (var i = 0; i < Bh.Length; i += 4)
{
var r = Bh.Pixels[i + 2];
var g = Bh.Pixels[i + 1];
var b = Bh.Pixels[i];
if (r != g || r != b || g != b)
{
return(false);
}
}
return(true);
}
public static async void AddPixelByValue(this Brush brush, float value)
{
bh.Initialize(brush);
for (int i = 0; i < bh.Length; i += 4)
{
var r = Truncate(bh.Pixels[i + 2] + value);
var g = Truncate(bh.Pixels[i + 1] + value);
var b = Truncate(bh.Pixels[i] + value);
bh.Pixels[i + 2] = r;
bh.Pixels[i + 1] = g;
bh.Pixels[i] = b;
}
await bh.UpdateBrush();
}
public static async void MeanFilter(this Brush brush)
{
Bh.Initialize(brush);
InitArrays();
_width = Bh.Width * 4;
var height = Bh.Height;
for (int x = 1; x < height - 1; x++)
{
for (int j = 4; j < _width - 5; j += 4)
{
int i = j + _width * x;
GoThroughMask(Mask.Mean, i, _width, 9);
}
}
await Bh.UpdateBrush(_temp);
}