4. In the Bag-of-features algorithm (Video Google) two feature detectors were used: Shape Adapted and Maximally Stable Extremal Regions. (a) What was the reason for this choice and what is each one detecting? (b) What do you think will be the outcome of applying the algorithm on two images which have the same features but appear at different locations in the images, and why? Can we improve on this, and if so, how?

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