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Table 15 Influence of parameters on SIFT matching performance Parameter Influence on SIFT matching performance Sigman The change of Sigman value is irrelevant with the matching quantity on the whole.
The matching time of SIFT algorithm firstly increases and then declines, while the matching quantity presents an overall declining trend.
Table 13 The matching quantity and time of NBO Parameter NBO Initial value Values 1 2 4 8 16 40 80 Matching quantity 6 8 10 11 11 12 12 Matching time 0.001 0.001 0.001 0.002 0.004 0.009 0.017 Fig. 20 The tendency chart of NBO matching quantity and time.
Table 10 The matching quantity and time of thresh Parameter Thresh Initial value Values 0.01 0.02 0.03 0.04 0.1 0.3 0.5 Matching quantity 11 11 11 11 10 3 0 Matching time 0.007 0.002 0.002 0.002 0.002 0 0 Fig. 17 The tendency chart of thresh matching quantity and time.
Table 11 The matching quantity and time of r Parameter r Initial value Values 0.01 0.5 5 10 20 50 100 Matching quantity 16 12 14 142 14 14 Matching time 0.003 0 0.001 0.002 0.003 0.003 0.003 Fig. 18 The tendency chart of r matching quantity and time.
Table 9 The matching quantity and time of Sigman Parameter Sigman Initial value Values 0.01 0.16 0.32 0.5 1 2 4 Matching quantity 11 11 11 11 11 11 11 Matching time 0.002 0.002 0.005 0.002 0.002 0.002 0.002 Fig. 16 The tendency chart of Sigman matching quantity and time.
For matching quantity index, the matching number of initial values is 46, while that of other Sigman values remains unchanged.
The matching time of SIFT algorithm presents an increasing trend, while the matching quantity firstly increases and then declines.
The matching time of SIFT algorithm shows a decreasing trend, while the matching quantity firstly increases and then decreases.
The matching time of SIFT algorithm presents an increasing trend, while the matching quantity firstly increases and then becomes steady.
Table 4 The matching time and quantity of thresh Parameter thresh Initial value Values 0.01 0.02 0.03 0.04 0.1 0.3 0.5 Matching quantity 47 47 47 46 28 5 0 Matching time 0.02 0.014 0.012 0.011 0.005 0 0.001 Fig. 11 The tendency chart of thresh matching time and quantity.
