| Operators |
moments_region_3rd — Geometric moments of regions.
The operator moments_region_3rd calculates the translation-invariant central moments (M21, M12, M03, M30) of order p+q.
x and y are the coordinates of the center of a region R with the area Z.
Then the moments are defined by:
wherein are
If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of a region in the input.
In case of empty region all parameters have the value 0.0 if no other behavior was set (see set_system).
Regions to be examined.
Moment of 3rd order (line-dependent).
Moment of 3rd order (column-dependent).
Moment of 3rd order (column-dependent).
Moment of 3rd order (line-dependent).
If Z is the area of the region the mean runtime complexity is O(sqrt(Z)).
The operator moments_region_3rd returns the value 2 (H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator set_system('no_object_result',<Result>). The behavior in case of empty region (the region is the empty set) is set via set_system('empty_region_result',<Result>). If necessary an exception is raised.
threshold, regiongrowing, connection
Foundation
| Operators |