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2026_ML pour la reconnaisance des formes

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When computing a descriptor using the histogram of gradients (HoG) approach for a given keypoint, which of the following propositions can be true?

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What are the three desirable (though contradictory) properties a good (local) feature descriptor should have?

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Why are binary descriptors called that way?

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Select the elements which can be attributes of a keypoint object.

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Given a picture of a face where the face is frontal, has eyes open, and takes up most or all of the image area. Which detector(s) can you use to find the pupils of the eyes?

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Select the appropriate legend for each sub-figure A-C in the image above.

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What can we detect using Harris approach?

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If your images are likely to suffer from blur, which detectors can you use?

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Using scale-space theory, how does the value of (scale) used detect the disks of sunflowers in the backof the figure above compare to the one needed to detect the disks of sunflowers in the front (larger ones)?

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Which operation(s) can be used to approximate the image derivatives?

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