thinning_seq — Remove the result of a hit-or-miss operation from a region (sequential).
thinning_seq is obsolete and is only provided for
reasons of backward compatibility.
thinning_seq(Region : RegionThin : GolayElement, Iterations : )
thinning_seq calculates the sequential thinning of
the input regions with a structuring element from the Golay alphabet
(GolayElement). To do so, thinning_seq
calls the operator thinning_golay with all possible
rotations of the structuring element Iterations times.
If Iterations is chosen large enough, the operator
calculates the skeleton of a region if the structuring elements 'l'
or 'm' are used. For the element 'c' the background and foreground
are exchanged in order to have an effect on the interior boundary of
a region. If a very large value or 'maximal' is passed for
Iterations the iteration stops if no more changes occur.
The following structuring elements are available:
Skeleton, similar to skeleton. This structuring
element is also used in morph_skiz.
A skeleton with many “hairs” and multiple (parallel) branches.
A skeleton without multiple branches, but with many gaps,
similar to morph_skeleton.
Uniform erosion of the region.
One pixel wide lines are shortened. This structuring element
is also used in morph_skiz.
Isolated points are removed. (Only Iterations = 1
is useful.)
Y-junctions are eliminated. (Only Iterations = 1
is useful.)
One pixel long branches and corners are removed. (Only
Iterations = 1 is useful.)
A kind of inner boundary, which, however, is thicker than the
result of boundary, is generated. (Only
Iterations = 1 is useful.)
Junction points are eliminated, but also new ones are generated.
The Golay elements, together with all possible rotations, are
described with the operator golay_elements.
Region (input_object) region(-array) → object
Regions to be processed.
RegionThin (output_object) region(-array) → object
Result of the thinning operator.
GolayElement (input_control) string → (string)
Structuring element from the Golay alphabet.
Default: 'l'
List of values: 'c', 'd', 'e', 'f', 'f2', 'h', 'i', 'k', 'l', 'm'
Iterations (input_control) integer → (integer / string)
Number of iterations. For 'f', 'f2', 'h' and 'i' the only useful value is 1.
Default: 20
Suggested values: 'maximal', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40, 50, 70, 100, 150, 200
Value range:
1
≤
Iterations
(lin)
Minimum increment: 1
Recommended increment: 1
Let F be the area of an input region. Then the runtime complexity for one region is:
thinning_seq returns 2 (
H_MSG_TRUE)
if all parameters are
correct. The behavior in case of empty or no input region can be
set via:
empty region:
set_system('empty_region_result',<RegionResult>)
Otherwise, an exception is raised.
threshold,
regiongrowing,
connection,
union1,
watersheds,
class_ndim_norm,
gen_circle,
gen_ellipse,
gen_rectangle1,
gen_rectangle2,
draw_region,
gen_region_points,
gen_struct_elements,
gen_region_polygon_filled
pruning,
reduce_domain,
select_shape,
area_center,
connection,
complement
skeleton,
morph_skiz,
expand_region
hit_or_miss_seq,
erosion_golay,
difference,
thinning_golay,
thinning,
thickening_seq
Foundation