/// <summary>
/// Fill the holes in the binary image
/// </summary>
/// <param name="b"></param>
protected Bitmap FillHoles( Bitmap b )
{
// clone and invert the bitmap ( which turns holes into islands ! )
Bitmap nb = new Bitmap( b );
// invert it
BlobMap.InvertImage( nb );
// create a temporary blob map which will capture the former holes as islands
BlobMap bm = new BlobMap( nb );
// fill holes
bm.FillHoles( nb );
// invert image with holes filled again !
BlobMap.InvertImage( nb );
// return the image with the holes fill
return nb;
}
/// <summary>
/// Create a new image based on the given sub image with the candidate red eye removed
/// </summary>
/// <param name="b"></param>
public Bitmap ProcessImage( Bitmap b )
{
// temporary images used to remove red eye
Bitmap rednessMask=null, rednessThreshold=null, falseColor=null, noSmallIslands=null, noHoles=null, blured=null;
// the image to return
Bitmap newImage = null;
try
{
// get a CIEMap of the image and the min/max CIE L values for the image
double minL, maxL;
CIELab[] cieMap = this.GetCIELABImage( b, out minL, out maxL );
// get redness mask image
rednessMask = this.GetMaskImage( cieMap, b.Width, b.Height );
// get a threshold of the redness mask
rednessThreshold = this.Threshold( rednessMask );
// create a blob map from the threasholded image
BlobMap blobmap = new BlobMap( rednessThreshold );
// create a false color copy of the thresholded images
falseColor = (Bitmap)rednessThreshold.Clone();
blobmap.ColorIslands( falseColor );
// remove all islands meeting a certain size criteria
noSmallIslands = (Bitmap)rednessThreshold.Clone();
blobmap.RemoveIslands( noSmallIslands );
// create a version with the holes filled
noHoles = this.FillHoles( noSmallIslands );
// get a guassian blurred version of the final mask
float[] kernel = ImageUtility.GetGaussianBlurKernel( 3, 15 );
blured = ImageUtility.Convolve( noHoles, kernel, 3 );
// create new image
newImage = this.GetNewImage( cieMap, // CIE Lab image of the source
minL, maxL, // min/max CIE L* values in the map
blured ); // the final mask to be used
// return new image
return newImage;
}
catch ( Exception )
{
}
finally
{
// cleanup any temporaries used
if ( rednessMask != null ) rednessMask.Dispose();
if ( rednessThreshold != null ) rednessThreshold.Dispose();
if ( falseColor != null ) falseColor.Dispose();
if ( noSmallIslands != null ) noSmallIslands.Dispose();
if ( noHoles != null ) noHoles.Dispose();
if ( blured != null ) blured.Dispose();
}
// return new image
return newImage;
}