Aforge get blobs from one image and extract same location from other

Question

I have an image that I do some processing to in order to separate the background from the foreground, creating a binary (black/white) image.

Using AForge, I am able to detect all blobs from the processed image, and return them.

So, I take my original image, copy it to "SourceImg", do some filtering to separate the background and make it a binary image, and then I can do the blob extraction properly.

    public static List<Bitmap> ApplyBlobExtractor(Bitmap SourceImg)
    {
        List<Bitmap> ImgLetters = new List<Bitmap>();
        AForge.Imaging.BlobCounter blobCounter = new AForge.Imaging.BlobCounter();

        // Sort order
        blobCounter.ObjectsOrder = AForge.Imaging.ObjectsOrder.XY;
        blobCounter.ProcessImage(SourceImg);
        AForge.Imaging.Blob[] blobs = blobCounter.GetObjects(SourceImg, false);

        // Adding images into the image list            
        AForge.Imaging.UnmanagedImage currentImg;
        foreach (AForge.Imaging.Blob blob in blobs)
        {
            currentImg = blob.Image;
            ImgLetters.Add(currentImg.ToManagedImage());
        }
        return ImgLetters;
    }

What I really want to do is use those blobs' information to extract the locations from the original, unprocessed image.

Ideally, I want to use the blob like a cookie cutter and grab extract them from my initial unprocessed image file.

Answer 1

You can use the AForge.Imaging.Filters.Intersect class using your blob's image and your source image.