Table 2: Comparison of the size of compressed files.

Category (num of tex)	6x6 block size	Ours
Photos (25)	4.1 MB	4.6 MB
Game textures (26)	12.2 MB	14.2 MB
GIS data (4)	531 KB	911 KB
Synthesized iamges (2)	141 KB	278 KB
Captured images (7)	199.3 MB	49.8 MB
Total (64)	216.3 MB	69.8 MB