Table 3: Rank-1 recognition rate of the proposed method when adopting different kernel functions.

Kernel Parameters in kernel functionsRank-1 recognition rate
USTB dataset 3UND dataset

Linear 75.44%74.22%
Polynomial , , 89.11%87.33%
RBF 96.46%94%
Cosine
, , 92.41%90.22%