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Hello,

Question 1: SIFT descriptor - Is it / array / vector / linked list / matrix ?

Question 2: Does descriptor contain keypoints or one keypoint ?

Question 3: What type is SIFT descriptor: boundary, region, relation ?

Question 4: What type is SURF descriptor: boundary, region, relation ?

Question 5: How calculates length of descriptor ? In case of SIFT it is 4x4 region with 8 bins = 128 bins. It is array with length of 128 per only one keypoint ?

Thanks in advance Dany