transpose_region — Reflect a region about a point.
transpose_region(Region : Transposed : Row, Column : )
transpose_region reflects a region about a point. The fixed
point is given by Column and Row. The image
P' of a point P is determined by the following requirement:
If P = S, then P' = S, i.e., the point S is the fixed point of
the mapping. If , S is the center point of
a line segment connecting P and P'. Therefore, the following
equations result:
If Row and Column are set to the origin, the
in morphology often used transposition results. Hence
transpose_region is often used to reflect (transpose) a
structuring element.
Region (input_object) region(-array) → object
Region to be reflected.
Transposed (output_object) region(-array) → object
Transposed region.
Row (input_control) point.y → (integer)
Row coordinate of the reference point.
Default value: 0
Suggested values: 0, 64, 128, 256, 512
Typical range of values: 0
≤
Row
≤
511 (lin)
Minimum increment: 1
Recommended increment: 1
Column (input_control) point.x → (integer)
Column coordinate of the reference point.
Default value: 0
Suggested values: 0, 64, 128, 256, 512
Typical range of values: 0
≤
Column
≤
511 (lin)
Minimum increment: 1
Recommended increment: 1
Let F be the area of the input region. Then the runtime complexity for one region is
transpose_region returns 2 (H_MSG_TRUE) if all parameters are
correct. The behavior in case of empty or no input region can be
set via:
no region: set_system('no_object_result',<RegionResult>)
empty region: set_system('empty_region_result',<RegionResult>)
Otherwise, an exception is raised.
reduce_domain,
select_shape,
area_center,
connection
Foundation