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Geometrical Informations

Surface
The number of pixels in the region.
Perimeter
The number of pixels on the outline of the region.
Mean
The mean of the coordinates of the points within the region.
Points of Including Rectangle (min & max)
The coordinates of the minimal point (at the left top) and the maximal point (at the right bottom) of the including rectangle of the region.
Height of Including Rectangle
The height (in number of pixels) of the including rectangle of the region.
Width of Including Rectangle
The width (in number of pixels) of the including rectangle of the region.
Center of Including Rectangle
The coordinates of the center of the including rectangle of the region.
Ratio Surface/(Height*Width)
Ratio between the area of the region and this of it including rectangle. This measure is 1.0 for a perfect rectangle and approaches zero for very small structures.
Ratio Perimeter/(2*Height*Width)
Ratio between the perimeter of the region and this of it including rectangle. This measure is 1.0 for a convex region, larger for regions with boundaries which double back on themselves.
Ratio (16*Surface)/(Perimeter**2)
This measure is 1.0 for a perfect square, smaller for shapes with irregular boundaries and maximal for a perfect circle in continuous.
Log10(Height/Width)
This value gives a symmetric measure of the aspect ratio.
Direction of the Major Axis
The direction of the longest projection (in the including rectangle of the region).
Angle of the Major Axis (radian)
The angle (in radians) of the major, or longest, axis of the including rectangle of the region.
Angle of the Major Axis (degree)
The angle (in degrees) of the major, or longest, axis of the including rectangle of the region.
Elongation (Length/Width)
Ratio between the length and the width of the including rectangle of the region. This measure is zero for a perfect circle and approaches 1.0 for an ellipse which is long and narrow.
Elongation (with the eigen values)
Ratio between the eigen value corresponding to the major axis of the including rectangle and the sum of the eigen values corresponding to the major and minor axis of the including rectangle of the region. This measure is zero for a perfect circle and approaches 1.0 for an ellipse which is long and narrow.

next up previous
Next: Photometrical informations Up: DesCartes Measurement List Previous: .
Brun Luc 2005-11-13