Table 1 Image feature applied in this study

Color temperature

Visual temperature of

3

color of three segments

Color weight

Visual weight of color

3

of three segments

Line

Straight line ratio,

4

mean slope, mean length,

standard deviation of slopes

Composition

Mean saliency for each

9

of the nine image regions

divided by "Rule of thirds"

Gabor filter

Multi-directional high

40

frequency component

DoG filter

Differential feature values

6

independent of direction

Local histogram

Local gray-scale histogram

90