thinningthinningThinningThinningthinning (Operator)

Name

thinningthinningThinningThinningthinning — Remove the result of a hit-or-miss operation from a region.

Warning

thinningthinningThinningThinningthinning is obsolete and is only provided for reasons of backward compatibility.

Signature

thinning(Region, StructElement1, StructElement2 : RegionThin : Row, Column, Iterations : )

Description

thinningthinningThinningThinningthinning performs a thinning of the input regions using morphological operations. The operator first applies a hit-or-miss-transformation to RegionRegionRegionregionregion (cf. hit_or_misshit_or_missHitOrMissHitOrMisshit_or_miss), and then removes the detected points from the input region. The parameter IterationsIterationsIterationsiterationsiterations determines the number of iterations performed.

For the choice of the structuring elements StructElement1StructElement1StructElement1structElement1struct_element_1 and StructElement2StructElement2StructElement2structElement2struct_element_2, as well as for RowRowRowrowrow and ColumnColumnColumncolumncolumn, the same restrictions described under hit_or_misshit_or_missHitOrMissHitOrMisshit_or_miss apply.

Structuring elements (StructElement1StructElement1StructElement1structElement1struct_element_1, StructElement2StructElement2StructElement2structElement2struct_element_2) can be generated with operators such as gen_circlegen_circleGenCircleGenCirclegen_circle, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1gen_rectangle1, gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2gen_rectangle2, gen_ellipsegen_ellipseGenEllipseGenEllipsegen_ellipse, draw_regiondraw_regionDrawRegionDrawRegiondraw_region, gen_region_polygongen_region_polygonGenRegionPolygonGenRegionPolygongen_region_polygon, gen_region_pointsgen_region_pointsGenRegionPointsGenRegionPointsgen_region_points, etc.

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

RegionRegionRegionregionregion (input_object) region(-array) → object

Regions to be processed.

StructElement1StructElement1StructElement1structElement1struct_element_1 (input_object) region → object

Structuring element for the foreground.

StructElement2StructElement2StructElement2structElement2struct_element_2 (input_object) region → object

Structuring element for the background.

RegionThinRegionThinRegionThinregionThinregion_thin (output_object) region(-array) → object

Result of the thinning operator.

RowRowRowrowrow (input_control) point.y → (integer)

Row coordinate of the reference point.

Default: 0

Value range: 0 ≤ Row Row Row row row ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

ColumnColumnColumncolumncolumn (input_control) point.x → (integer)

Column coordinate of the reference point.

Default: 0

Value range: 0 ≤ Column Column Column column column ≤ 511 (lin)

Minimum increment: 1

Recommended increment: 1

IterationsIterationsIterationsiterationsiterations (input_control) integer → (integer)

Number of iterations.

Default: 1

Suggested values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 20, 30, 40, 50

Value range: 1 ≤ Iterations Iterations Iterations iterations iterations (lin)

Minimum increment: 1

Recommended increment: 1

Complexity

Let F be the area of an input region, F1 the area of the structuring element 1, and F2 the area of the structuring element 2. Then the runtime complexity for one object is:

Result

thinningthinningThinningThinningthinning returns 2 ( H_MSG_TRUE) if all parameters are correct. The behavior in case of empty or no input region can be set via: