Table 2.

Comparison of matching time (second) using hash codes and real-valued representation.

Method	Hash codes						Real value
	64 bits	96 bits	128 bits	256 bits	512 bits	768 bits	Euclidean	Cosine
10−5 s	0.1698	0.1756	0.1964	0.3016	0.4272	0.6136	35.509	77.600