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- B max ,B min : Maximum and minimum brightness values among the agent's
neighborhood
- rand : a uniformly random number in the range [0 , 1]
Fig. 2. Moore neighborhood and directions
2. Calculate output values from the inputs.
The output values are computed by the agent's GP-tree and the 16 inputs. In
this study, we introduce uncertainty in determining the direction to diversify
the generated patterns. The output values include new hue a H , saturation
a S ,brightness a B , and direction a dir , which are used to determine the agent's
next pixel to move to. Note that the hue, saturation, and brightness values
might be out of bounds [0 , 1] and are thus truncated by discarding the integer
part and negative sign. The direction is also regularized to
{
0 ,..., 8
}
by the
remainder of dividing (100
a dir ) by nine. Table 1 lists the functions used for
the GP-trees. An example GP-tree is given in Fig. 3.
·
Tabl e 1. Function set used in the GP
Function
Action (on two inputs x and y )
add
x + y
sub
x − y
mult
xy
const
returns the associated constant value
max
max( x,y )
min
min( x,y )
sin
sin( x )
id
x
1 y< 0 . 0001
x/y otherwise
div
x +1 / 8 y> 0 . 5
x − 1 / 8 th rw e
incdec
x + y
2
mean
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