moments_region_2nd_rel_invar moments_region_2nd_rel_invar MomentsRegion2ndRelInvar MomentsRegion2ndRelInvar moments_region_2nd_rel_invar (Operator)
Name
moments_region_2nd_rel_invar moments_region_2nd_rel_invar MomentsRegion2ndRelInvar MomentsRegion2ndRelInvar moments_region_2nd_rel_invar
— Geometric moments of regions.
Signature
Herror moments_region_2nd_rel_invar (const Hobject Regions , double* PHI1 , double* PHI2 )
Herror T_moments_region_2nd_rel_invar (const Hobject Regions , Htuple* PHI1 , Htuple* PHI2 )
def moments_region_2nd_rel_invar (regions : HObject) -> Tuple[Sequence[float], Sequence[float]]
def moments_region_2nd_rel_invar_s (regions : HObject) -> Tuple[float, float]
Description
The operator moments_region_2nd_rel_invar moments_region_2nd_rel_invar MomentsRegion2ndRelInvar MomentsRegion2ndRelInvar moments_region_2nd_rel_invar
calculates the
scaled relative moments (PHI1 PHI1 PHI1 PHI1 phi1
, PHI2 PHI2 PHI2 PHI2 phi2
).
Calculation:
The moments PHI1 and PHI2 are defined by:
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 set_system SetSystem SetSystem set_system
).
Execution Information
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Parameters
Regions Regions Regions regions regions
(input_object) region(-array) →
object HRegion HObject HObject Hobject
Regions to be examined.
PHI1 PHI1 PHI1 PHI1 phi1
(output_control) real(-array) →
HTuple Sequence[float] HTuple Htuple (real) (double ) (double ) (double )
Moment of 2nd order.
PHI2 PHI2 PHI2 PHI2 phi2
(output_control) real(-array) →
HTuple Sequence[float] HTuple Htuple (real) (double ) (double ) (double )
Moment of 2nd order.
Result
The operator moments_region_2nd_rel_invar moments_region_2nd_rel_invar MomentsRegion2ndRelInvar MomentsRegion2ndRelInvar moments_region_2nd_rel_invar
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>) set_system("no_object_result",<Result>) SetSystem("no_object_result",<Result>) SetSystem("no_object_result",<Result>) 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>) set_system("empty_region_result",<Result>) SetSystem("empty_region_result",<Result>) SetSystem("empty_region_result",<Result>) set_system("empty_region_result",<Result>)
.
If necessary an exception is raised.
Possible Predecessors
threshold threshold Threshold Threshold threshold
,
regiongrowing regiongrowing Regiongrowing Regiongrowing regiongrowing
,
connection connection Connection Connection connection
Alternatives
moments_region_2nd moments_region_2nd MomentsRegion2nd MomentsRegion2nd moments_region_2nd
See also
elliptic_axis elliptic_axis EllipticAxis EllipticAxis elliptic_axis
Module
Foundation