private void ProcessImage( UnmanagedImage image )
{
PixelFormat pixelFormat = image.PixelFormat;
// get image dimension
int width = image.Width;
int height = image.Height;
red = green = blue = gray = null;
// do the job
unsafe
{
// check pixel format
if ( pixelFormat == PixelFormat.Format8bppIndexed )
{
// 8 bpp grayscale image
byte* p = (byte*) image.ImageData.ToPointer( );
int offset = image.Stride - width;
// histogram array
int[] g = new int[width];
// for each pixel
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p++ )
{
g[x] += *p;
}
p += offset;
}
// create historgram for gray level
gray = new Histogram( g );
}
else if ( pixelFormat == PixelFormat.Format16bppGrayScale )
{
// 16 bpp grayscale image
byte* basePtr = (byte*) image.ImageData.ToPointer( );
int stride = image.Stride;
// histogram array
int[] g = new int[width];
// for each pixel
for ( int y = 0; y < height; y++ )
{
ushort* p = (ushort*) ( basePtr + stride * y );
// for each pixel
for ( int x = 0; x < width; x++, p++ )
{
g[x] += *p;
}
}
// create historgram for gray level
gray = new Histogram( g );
}
else if (
( pixelFormat == PixelFormat.Format24bppRgb ) ||
( pixelFormat == PixelFormat.Format32bppRgb ) ||
( pixelFormat == PixelFormat.Format32bppArgb ) )
{
// 24/32 bpp color image
byte* p = (byte*) image.ImageData.ToPointer( );
int pixelSize = ( pixelFormat == PixelFormat.Format24bppRgb ) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
// histogram arrays
int[] r = new int[width];
int[] g = new int[width];
int[] b = new int[width];
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize )
{
r[x] += p[RGB.R];
g[x] += p[RGB.G];
b[x] += p[RGB.B];
}
p += offset;
}
// create histograms
red = new Histogram( r );
green = new Histogram( g );
blue = new Histogram( b );
}
else if (
( pixelFormat == PixelFormat.Format48bppRgb ) ||
( pixelFormat == PixelFormat.Format64bppArgb ) )
{
// 48/64 bpp color image
byte* basePtr = (byte*) image.ImageData.ToPointer( );
int stride = image.Stride;
int pixelSize = ( pixelFormat == PixelFormat.Format48bppRgb ) ? 3 : 4;
// histogram arrays
int[] r = new int[width];
int[] g = new int[width];
int[] b = new int[width];
// for each line
for ( int y = 0; y < height; y++ )
{
ushort* p = (ushort*) ( basePtr + stride * y );
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize )
{
r[x] += p[RGB.R];
g[x] += p[RGB.G];
b[x] += p[RGB.B];
}
}
// create histograms
red = new Histogram( r );
green = new Histogram( g );
blue = new Histogram( b );
}
}
}
}
