public Bitmap Apply(BitmapData imageData)
{
if (!FormatTranslations.ContainsKey(imageData.PixelFormat))
{
throw new UnsupportedImageFormatException("Source pixel format is not supported by the filter.");
}
BlobCounter blobCounter = new BlobCounter(imageData);
Blob[] objectsInformation = blobCounter.GetObjectsInformation();
int num = 0;
Blob blob = null;
int i = 0;
for (int num2 = objectsInformation.Length; i < num2; i++)
{
int num3 = objectsInformation[i].Rectangle.Width * objectsInformation[i].Rectangle.Height;
if (num3 > num)
{
num = num3;
blob = objectsInformation[i];
}
}
if (blob == null)
{
throw new ArgumentException("The source image does not contain any blobs.");
}
blobPosition = new IntPoint(blob.Rectangle.Left, blob.Rectangle.Top);
if (originalImage == null)
{
blobCounter.ExtractBlobsImage(new UnmanagedImage(imageData), blob, extractInOriginalSize: false);
}
else
{
if (originalImage.PixelFormat != PixelFormat.Format24bppRgb && originalImage.PixelFormat != PixelFormat.Format32bppArgb && originalImage.PixelFormat != PixelFormat.Format32bppRgb && originalImage.PixelFormat != PixelFormat.Format32bppPArgb && originalImage.PixelFormat != PixelFormat.Format8bppIndexed)
{
throw new UnsupportedImageFormatException("Original image may be grayscale (8bpp indexed) or color (24/32bpp) image only.");
}
if (originalImage.Width != imageData.Width || originalImage.Height != imageData.Height)
{
throw new InvalidImagePropertiesException("Original image must have the same size as passed source image.");
}
blobCounter.ExtractBlobsImage(originalImage, blob, extractInOriginalSize: false);
}
Bitmap result = blob.Image.ToManagedImage();
blob.Image.Dispose();
return(result);
}
/// <summary>
/// Apply filter to an image.
/// </summary>
///
/// <param name="imageData">Source image to get biggest blob from.</param>
///
/// <returns>Returns image of the biggest blob.</returns>
///
/// <exception cref="UnsupportedImageFormatException">Unsupported pixel format of the source image.</exception>
/// <exception cref="UnsupportedImageFormatException">Unsupported pixel format of the original image.</exception>
/// <exception cref="InvalidImagePropertiesException">Source and original images must have the same size.</exception>
/// <exception cref="ArgumentException">The source image does not contain any blobs.</exception>
///
public Bitmap Apply(BitmapData imageData)
{
// check pixel format of the source image
if (!FormatTranslations.ContainsKey(imageData.PixelFormat))
{
throw new UnsupportedImageFormatException("Source pixel format is not supported by the filter.");
}
// locate blobs in the source image
var blobCounter = new BlobCounter(imageData);
// get information about blobs
var blobs = blobCounter.GetObjectsInformation();
// find the biggest blob
var maxSize = 0;
Blob biggestBlob = null;
for (int i = 0, n = blobs.Length; i < n; i++)
{
var size = blobs[i].Rectangle.Width * blobs[i].Rectangle.Height;
if (size > maxSize)
{
maxSize = size;
biggestBlob = blobs[i];
}
}
// check if any blob was found
if (biggestBlob == null)
{
throw new ArgumentException("The source image does not contain any blobs.");
}
blobPosition = new IntPoint(biggestBlob.Rectangle.Left, biggestBlob.Rectangle.Top);
// extract biggest blob's image
if (originalImage == null)
{
blobCounter.ExtractBlobsImage(new UnmanagedImage(imageData), biggestBlob, false);
}
else
{
// check original image's format
if (
(originalImage.PixelFormat != PixelFormat.Format24bppRgb) &&
(originalImage.PixelFormat != PixelFormat.Format32bppArgb) &&
(originalImage.PixelFormat != PixelFormat.Format32bppRgb) &&
(originalImage.PixelFormat != PixelFormat.Format32bppPArgb) &&
(originalImage.PixelFormat != PixelFormat.Format8bppIndexed)
)
{
throw new UnsupportedImageFormatException("Original image may be grayscale (8bpp indexed) or color (24/32bpp) image only.");
}
// check its size
if ((originalImage.Width != imageData.Width) || (originalImage.Height != imageData.Height))
{
throw new InvalidImagePropertiesException("Original image must have the same size as passed source image.");
}
blobCounter.ExtractBlobsImage(originalImage, biggestBlob, false);
}
var managedImage = biggestBlob.Image.ToManagedImage();
// dispose unmanaged image of the biggest blob
biggestBlob.Image.Dispose();
return(managedImage);
}
