What means 'blobs' on SIFT algorithm? [closed]
 
  
 
  
 
 
 
 
 
 asked Jun 30 '17 
 
 Kelvin gravatar image  
 
 
 
 
 
Hi, I have a doubt about the SIFT algorithm.
 
In the OpenCV documentation it says:
 
 
For this, scale-space filtering is
  used. In it, Laplacian of Gaussian is
  found for the image with various σ
  values. LoG acts as a blob detector
  which detects blobs in various sizes
  due to change in σ.
 
 
I don't quite understand what means 'detects blobs', can someone explain to me?
 
Thanks in advance
 
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Closed for the following reason
      the question is answered, right answer was accepted by
      sturkmen 

      close date 2020-09-26 14:00:45.611722
 
 
Comments
berak gravatar imageberak (Jun 30 '17)edit
So, 'blobs' means 'color stains'?
Kelvin gravatar imageKelvin (Jun 30 '17)edit
"clusters of points", maybe ?
berak gravatar imageberak (Jun 30 '17)edit
Ok, thanks @berak.
Kelvin gravatar imageKelvin (Jun 30 '17)edit
2
Quote from Blob_detection Wikipedia article: 
In computer vision, blob detection methods are aimed at detecting regions in a digital image that differ in properties, such as brightness or color, compared to surrounding regions. Informally, a blob is a region of an image in which some properties are constant or approximately constant; all the points in a blob can be considered in some sense to be similar to each other.
Eduardo gravatar imageEduardo (Jun 30 '17)edit
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