// Selection changed in component combo
private void componentCombo_SelectedIndexChanged(object sender, System.EventArgs e)
{
AForge.Math.HistogramD h = null;
RangeD input = new RangeD(0, 1);
RangeD output = new RangeD(0, 1);
if (componentCombo.SelectedIndex == 0)
{
// satureation
h = imgStat.Saturation;
input = inSaturation;
output = outSaturation;
}
else
{
// luminance
h = imgStat.Luminance;
input = inLuminance;
output = outLuminance;
}
histogram.Values = h.Values;
inMinBox.Text = input.Min.ToString("F3");
inMaxBox.Text = input.Max.ToString("F3");
outMinBox.Text = output.Min.ToString("F3");
outMaxBox.Text = output.Max.ToString("F3");
// input slider
inSlider.Min = (int)(input.Min * 255);
inSlider.Max = (int)(input.Max * 255);
// output slider
outSlider.Min = (int)(output.Min * 255);
outSlider.Max = (int)(output.Max * 255);
}
// Selection changed in component combo
private void componentCombo_SelectedIndexChanged(object sender, System.EventArgs e)
{
AForge.Math.HistogramD h = null;
RangeD input = new RangeD(0, 1);
RangeD output = new RangeD(0, 1);
double start = 0;
switch (componentCombo.SelectedIndex)
{
case 0:
// Y
h = imgStat.Y;
input = inY;
output = outY;
break;
case 1:
// Cb
h = imgStat.Cb;
input = inCb;
output = outCb;
start = -0.5;
break;
case 2:
// Cr
h = imgStat.Cr;
input = inCr;
output = outCr;
start = -0.5;
break;
}
histogram.Values = h.Values;
inMinBox.Text = input.Min.ToString("F3");
inMaxBox.Text = input.Max.ToString("F3");
outMinBox.Text = output.Min.ToString("F3");
outMaxBox.Text = output.Max.ToString("F3");
// input slider
inSlider.Min = (int)((input.Min - start) * 255);
inSlider.Max = (int)((input.Max - start) * 255);
// output slider
outSlider.Min = (int)((output.Min - start) * 255);
outSlider.Max = (int)((output.Max - start) * 255);
}
// Gather statistics
private void ProcessImage( BitmapData imageData, int width, int height )
{
pixels = pixelsWithoutBlack = 0;
int[] yhisto = new int[256];
int[] cbhisto = new int[256];
int[] crhisto = new int[256];
int[] yhistoWB = new int[256];
int[] cbhistoWB = new int[256];
int[] crhistoWB = new int[256];
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int offset = imageData.Stride - width * 3;
// do the job
unsafe
{
byte * p = (byte *) imageData.Scan0.ToPointer( );
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += 3 )
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
yhisto [(int) ( ycbcr.Y * 255 )]++;
cbhisto[(int) ( ( ycbcr.Cb + 0.5 ) * 255 )]++;
crhisto[(int) ( ( ycbcr.Cr + 0.5 ) * 255 )]++;
pixels++;
if ( ( ycbcr.Y != 0.0 ) || ( ycbcr.Cb != 0.0 ) || ( ycbcr.Cr != 0.0 ) )
{
yhistoWB [(int) ( ycbcr.Y * 255 )]++;
cbhistoWB[(int) ( ( ycbcr.Cb + 0.5 ) * 255 )]++;
crhistoWB[(int) ( ( ycbcr.Cr + 0.5 ) * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
// create histograms
yHistogram = new HistogramD( yhisto , new RangeD( 0.0, 1.0 ) );
cbHistogram = new HistogramD( cbhisto, new RangeD( -0.5, 0.5 ) );
crHistogram = new HistogramD( crhisto, new RangeD( -0.5, 0.5 ) );
yHistogramWithoutBlack = new HistogramD( yhistoWB , new RangeD( 0.0, 1.0 ) );
cbHistogramWithoutBlack = new HistogramD( cbhistoWB, new RangeD( -0.5, 0.5 ) );
crHistogramWithoutBlack = new HistogramD( crhistoWB, new RangeD( -0.5, 0.5 ) );
}
