aforge - ExtractBiggestBlob crop cordinates -

i use extractbiggestblob minimize original image smallest possible contour. , after binarize original image can smallest possible contour of image. how can find coordinates of blob after using extractbiggestblob can use crop original image?

edit 1: have found out:

extractbiggestblob bbb = new extractbiggestblob();// extract biggest blob                     bitmap biggestblobsimage = bbb.apply(channelimage);                     intpoint blobposition = bbb.blobposition;                     //console.writeline(blobposition.x);                     //console.writeline(blobposition.y);