private unsafe void ProcessImage( UnmanagedImage image, byte* mask, int maskLineSize )
{
// get image dimension
int width = image.Width;
int height = image.Height;
pixels = pixelsWithoutBlack = 0;
int[] s = new int[256];
int[] l = new int[256];
int[] swb = new int[256];
int[] lwb = new int[256];
RGB rgb = new RGB( );
HSL hsl = new HSL( );
int pixelSize = ( image.PixelFormat == PixelFormat.Format24bppRgb ) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
int maskOffset = maskLineSize - width;
// do the job
byte * p = (byte*) image.ImageData.ToPointer( );
if ( mask == null )
{
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize )
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
AForge.Imaging.HSL.FromRGB( rgb, hsl );
s[(int) ( hsl.Saturation * 255 )]++;
l[(int) ( hsl.Luminance * 255 )]++;
pixels++;
if ( hsl.Luminance != 0.0 )
{
swb[(int) ( hsl.Saturation * 255 )]++;
lwb[(int) ( hsl.Luminance * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
else
{
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize, mask++ )
{
if ( *mask == 0 )
continue;
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
AForge.Imaging.HSL.FromRGB( rgb, hsl );
s[(int) ( hsl.Saturation * 255 )]++;
l[(int) ( hsl.Luminance * 255 )]++;
pixels++;
if ( hsl.Luminance != 0.0 )
{
swb[(int) ( hsl.Saturation * 255 )]++;
lwb[(int) ( hsl.Luminance * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
mask += maskOffset;
}
}
// create histograms
saturation = new ContinuousHistogram( s, new Range( 0, 1 ) );
luminance = new ContinuousHistogram( l, new Range( 0, 1 ) );
saturationWithoutBlack = new ContinuousHistogram( swb, new Range( 0, 1 ) );
luminanceWithoutBlack = new ContinuousHistogram( lwb, new Range( 0, 1 ) );
}
