MoleExpert is a software based on extensive
experience in the field of automated analysis
of pigmented skin lesions. The software works
with a range of different camera systems.High
quality dermatoscopic images of pigmented skin
lesions are the main requirement for the
successful use of this software. MoleExpert micro
measures asymmetry, blur of border, color and size
of lesions. These parameters have been commonly accepted as major factors for
the ABCD rule.
Description of the parameters
For the determination of asymmetry, axes
crossing the center of the lesion are analyzed.
For each of these axes the agreement of the
lesion on both side the axis is measured. The
agreement is used as the measurement of
symmatry. On the right side the measure of
symmatry is shown as diagram for the angles
of rotation of the symmetry axes. With
consideration of all axes a score for the
asymmetry of the lesion is determined.
Moving the mouse over over diagram you can check the appropriate axis in the analysis image. Diagram with the asymmetry data for the different angles of the regarded symmetry axes.
For the determination of the edge acuity as
measure of the border the originally determined
edge is compared with a smoothed edge. If a
position in the diagram is selected using the
mouse, the appropriate boundary region in the
left picture is marked.
The color parameter measures the differences
and distribution of color occurring in the image.
A measurement of the absolute color value is not
meaningful, since the patients skin will be more
or less tanned depending on the season. With
this score the structural information is used
in consideration of color distribution.The
rotating RGB diagram on the right side serves
as an illustration of color dispersion. This diagram
shows the red, green and blue values for each pixel. The color distribution of nevi
frequently appears as a closed tube. In pictures of melanomas this tube will usually
be broader and widen towards the lower end.Color distribution of the lesion in the
animated 3D RGB diagram
As is the case for asymmetry, for the determination
of maximum diameter axes are placed across the
center of the lesion. For all axes the outermost edge
is used in the determination of the diameter.
Depending on the angle of rotation, the measured
diameters are given in the diagram on the right side.
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