Table 1. Mean average precision for top 20 retrievals (visual words integration).

Vocabulary size & features % used	50	100	200	400	600	800	1000	1200
10%	68.87	71.01	74.05	74.46	74.94	74.54	74.77	74.67
25%	69.62	72.52	74.36	74.75	75.48	75.02	75.2	75.53
50%	68.4	72.13	73.62	75.27	75.55	75.4	75.72	75.4
75%	69.94	71.87	73.24	75.78	74.75	75.53	74.75	74.84
100%	69.87	72.69	74.23	74.04	75.15	75.05	74.62	74.89
Mean	69.34	72.04	73.9	74.86	75.17	75.10	75.01	75.06
CI	±0.84	±0.82	±0.57	±0.85	±0.42	±0.47	±0.56	±0.46
Sigma	0.68	0.66	0.46	0.68	0.34	0.73	0.45	0.38