Extract Image from Blob

[Blitzit]

Hello everybody,
I am developping an application to try clothes like a magic mirror..
The problem is that I'm stucked at the part where i need to insert clothes into the system.
The image of the cloth is provided by a shot from a webcam. So, i could use the method to extract the biggest blob, the problem is that the final result should be only the cloth with transparent background.
I've searched a lot and i still didnt' found a way to achieve this: ONLY extract an image, NOT the rectangular area that corresponds to the blob.

A pratical example would be turning this

into this:

Any help would be appreciated

[andrew.kirillov]

Hello,

You may try using ExtractBlobsImage() and specify original image containing your cloth.

[Blitzit]

Hello,

You may try using ExtractBlobsImage() and specify original image containing your cloth.

Thx for the tip! unfortunately, it still didnt' work, my code is the following:

Code: Select all

Bitmap imagem = (Bitmap)Bitmap.FromFile(openFileDialog.FileName);

//Apply treshold to get the biggest blob (the entire cloth)
FiltersSequence commonSeq = new FiltersSequence();
commonSeq.Add(Grayscale.CommonAlgorithms.BT709);
commonSeq.Add(new BradleyLocalThresholding());
commonSeq.Add(new DifferenceEdgeDetector());

Bitmap temp =  commonSeq.Apply(imagem);

BlobCounterBase cbase = new BlobCounter();

cbase.ProcessImage(temp);

Blob[] blobs = cbase.GetObjectsInformation();

//get the biggest blob
int temparea = 0;
int blobindice = 0;
int i=0;
foreach (Blob blob in blobs){
   if (blob.Area > temparea){
      temparea = blob.Area;
      blobindice = i;
   }
   i=i+1;
}

//extracting image from original image but with an blob that comes from the "adulterated" image.
cbase.ExtractBlobsImage(imagem, blobs[blobindice], true);

Bitmap teste1 = new Bitmap(800,600);

teste1 = blobs[blobindice].Image.ToManagedImage();

//transform black pixels into nothing to achieve transparency
teste1.MakeTransparent();

teste1.Save("c:\\result.png",System.Drawing.Imaging.ImageFormat.Png) ;


Original image:

The result is the following :
without aplying transparency :

Can you tell me what I am doing wrong ? :\

[andrew.kirillov]

When you say the code does not work, what does it really mean? Exception? Error? An image which does not look right? Or?

[Blitzit]

When you say the code does not work, what does it really mean? Exception? Error? An image which does not look right? Or?

i say that it doesn't work because the result as you can see in my previous post is not what i pretend. can you see the pictures that i posted?

I found a post where you posted the following:
Postby andrew.kirillov » Sat Aug 13, 2011 7:02 am
Here is the code, which will do what you need (follow documentation if there is something unclear):

Code: Select all

    Bitmap image1 = (Bitmap) Bitmap.FromFile( "d:\\test.jpg" );
    Bitmap temp = Grayscale.CommonAlgorithms.BT709.Apply( image1 );

    Invert invert = new Invert( );
    invert.ApplyInPlace( temp );

    Threshold threshold = new Threshold( );
    threshold.ApplyInPlace( temp );

    BlobCounter blobCounter = new BlobCounter( );
    blobCounter.FilterBlobs = true;
    blobCounter.MinWidth = 80;
    blobCounter.MinWidth = 80;
    blobCounter.ObjectsOrder = ObjectsOrder.Size;
    blobCounter.ProcessImage( temp );

    Blob[] blobs = blobCounter.GetObjectsInformation( );

    if ( blobs.Length > 0 )
    {
        blobCounter.ExtractBlobsImage( temp, blobs[0], true );

        FillHoles fillHoles = new FillHoles( );
        fillHoles.ApplyInPlace( blobs[0].Image );

        GrayscaleToRGB toRgb = new GrayscaleToRGB( );
        UnmanagedImage mask = toRgb.Apply( blobs[0].Image );

        Intersect intersect = new Intersect( );
        intersect.UnmanagedOverlayImage = mask;

        image1 = intersect.Apply( image1 );
    }

And it works like a charm , after adding "image1.MakeTransparent();" !
The only small problem now is that some black pixels on cloth where obviously made transparent.. any tip to apply transparency only around the image?

[andrew.kirillov]

can you see the pictures that i posted?

No, because you did not post any pictures.

any tip to apply transparency only around the image?

Yes, try [url]=http://www.aforgenet.com/framework/docs/html/68bd57bd-1fd6-6c4e-4500-ed4726bc836e.htmfill holes[/url] in the biggest blob. The apply it as a mask to the original image.