Design and Implementation - Segmentation of Hand Bone for Bone Age Assessment - page 69

Input Image

Diffusion Strength
Function

Option 2

Option 1

1

2

x

c x

c x exp

2

x

k 1

k

Diffusion Constant , k
determination

Number of Direction

Option 1 Option 2

Φ + Φ + Φ + Φ Φ + Φ + Φ + Φ + Φ + Φ + Φ + Φ

east west north south eastnorth westsouth westnorth eastsouth

east west north south

Setting,0<

∆

<1/7

∆

Maximum Number of Iteration, M

End

Fig. 3.8 Flow chart of conventional anisotropic diffusion

κ constant is essential to define the edges and area homogeneity; hence, different
diffusion intensity is imposed on them. Subsequently, amounts of directions is to
be determined: either 4 directions or 8 directions, as common practice. Then, the
decision on integration constant, Δ t: the effect of Δ t is analogous to the approxi-
mation for continuous case using integration for discrete implementation. Finally,
stopping criterion is determined: the maximum number of iteration. The flow chart
of the designed automated anisotropic diffusion is presented without the need for
manual parameter selection is presented in Fig. 3.9 .