Asaduzzaman Babu and Mahmoud R. El-Sakka, "A Hybrid Scaling
Factor for Speckle Reducing Anisotropic Diffusion",
International Symposium on Image and Signal Processing and
Analysis, ISPA'2013, pp. 4-9, September 2013, Trieste, Italy.
Classical Speckle Reducing Anisotropic Diffusion (SRAD) is a
noise filtering method tailored to speckle reduction in
digital images. It is well known that SRAD has a tendency to
produce dislocated and un-sharp edges. This property of SRAD
is highly attributed to its reliance on a homogeneous image
region, selected initially, for a scaling factor calculation.
Moreover, this scaling factor calculation strategy requires
the interaction of an experienced user. To reduce the
reliance on an initially selected perfect/near-perfect
homogeneous region, we propose a hybrid scaling factor that
reduces edge dislocation and preserves the sharpness of
edges. The proposed scaling factor selection strategy uses a
ratio-based edge detection technique for an estimation of
the homogeneity of the initially selected region.