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Blob detection.

Figures 14-15 show corresponding result of blob detection on a sunflower image, where we can see how the size variations in the image of the sunflowers are captured in the features extracted by the scale selection mechanism.

  
Figure 14: Results of blob detection detection with automatic scale selection on a sunflower image
(200 strongest blob responses).

  
Figure 15: Three-dimensional view of the blob responses obtained from the sunflower image.