Dilate a region (using a reference point).
dilation2 dilates the input regions with a structuring element (StructElement) having the reference point (Row,Column). dilation2 has a similar effect as dilation1, the difference is that the reference point of the structuring element can be chosen arbitrarily. The parameter Iterations determines the number of iterations which are to be performed with the structuring element. The result of iteration n-1 is used as input for iteration n.
An empty region is generated in case of an empty structuring element.
Structuring elements (StructElement) can be generated with operators such as gen_circle, gen_rectangle1, gen_rectangle2, gen_ellipse, draw_region, gen_region_polygon, gen_region_points, etc.
A dilation always results in enlarged regions. Closely spaced regions which may touch or overlap as a result of the dilation are still treated as two separate regions. If the desired behavior is to merge them into one region, the operator union1 has to be called first.
|
Region (input_object) |
region(-array) -> object |
| Regions to be dilated. | |
|
StructElement (input_object) |
region -> object |
| Structuring element. | |
|
RegionDilation (output_object) |
region(-array) -> object |
| Dilated regions. | |
|
Row (input_control) |
point.y -> integer |
| Row coordinate of the reference point. | |
| Default value: 0 | |
|
Column (input_control) |
point.x -> integer |
| Column coordinate of the reference point. | |
| Default value: 0 | |
|
Iterations (input_control) |
integer -> integer |
| Number of iterations. | |
| Default value: 1 | |
| Suggested values: 1, 2, 3, 4, 5, 7, 11, 17, 25, 32, 64, 128 | |
| Typical range of values: 1 <= Iterations | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
Let F1 be the area of the input region, and F2 be the area of the structuring element. Then the runtime complexity for one region is:
O(sqrt(F1) * sqrt(F2) * Iterations) .
dilation2 returns 2 (H_MSG_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.
dilation2 is reentrant and automatically parallelized (on tuple level).
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
reduce_domain, add_channels, select_shape, area_center, connection
minkowski_add1, minkowski_add2, dilation1, dilation_golay, dilation_seq
erosion1, erosion2, opening, closing
Morphology
