Close a region with a circular structuring element.
closing_circle behaves analogously to closing, i.e., the regions' boundaries are smoothed and holes within a region which are smaller than the circular structuring element of radius Radius are closed. The closing_circle operation is defined as a dilation followed by a Minkowski subtraction, both with the same circular structuring element.
closing_circle is applied to each input region separately. If gaps between different regions are to be closed, union1 or union2 has to be called first.
Region (input_object) |
region(-array) -> object |
Regions to be closed. |
RegionClosing (output_object) |
region(-array) -> object |
Closed regions. |
Radius (input_control) |
real -> real / integer |
Radius of the circular structuring element. | |
Default value: 3.5 | |
Suggested values: 1.5, 2.5, 3.5, 4.5, 5.5, 7.5, 9.5, 12.5, 15.5, 19.5, 25.5, 33.5, 45.5, 60.5, 110.5 | |
Range of values: 0.5 <= Radius <= 511.5 (lin) | |
Minimum increment: 1.0 | |
Recommended increment: 1.0 |
my_closing_circle(ObjType In, double Radius, ObjType *Out) { ObjType tmp, StructElement; circle(StructElement,100.0,100.0,Radius); dilation1(In,StructElement,&tmp,1); minkowski_sub1(tmp,StructElement,Out,1); clear(tmp); clear(StructElement); }
Let F1 be the area of the input region. Then the runtime complexity for one region is:
O(4 * sqrt(F1) * Radius) .
closing_circle returns TRUE if all parameters are correct. The behavior in case of empty or no input region can be set via:
a) no region: set_system(::'no_object_result',<RegionResult>:) b) empty region: set_system(::'empty_region_result',<RegionResult>:)Otherwise, an exception is raised.
threshold__, regiongrowing__, connection, union1, watersheds, class_ndim1__
reduce_domain, select_shape, area_center, connection
count, fill_up, closing, closing_circle, closing_golay
dilation1, minkowski_sub1, erosion1, opening