Convert regions to a label image.
region_to_label converts the input regions into a label image according to their index (1..n), i.e., the first region is painted with the gray value 1, the second the gray value 2, etc. Only positive gray values are used. For byte-images the index is entered modulo 256.
Regions larger than the generated image are clipped appropriately. If regions overlap the regions with the higher image are entered (i.e., they are painted in the order in which they are contained in the input regions). If so desired, the regions can be made non-overlapping by calling expand_region.
The background, i.e., the area not covered by any regions, is set to 0. This can be used to test in which image range no region is present.
|
Region (input_object) |
region(-array) -> object |
| Regions to be converted. | |
|
ImageLabel (output_object) |
image -> object : byte / int2 / int4 |
| Result image of dimension Width * Height containing the converted regions. | |
|
Type (input_control) |
string -> string |
| Pixel type of the result image. | |
| Default value: 'int2' | |
| List of values: 'byte', 'int2', 'int4' | |
|
Width (input_control) |
extent.y -> integer |
| Width of the image to be generated. | |
| Default value: 512 | |
| Suggested values: 64, 128, 256, 512, 1024 | |
| Typical range of values: 1 <= Width <= 1024 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 16 | |
| Restriction: Width >= 1 | |
|
Height (input_control) |
extent.x -> integer |
| Height of the image to be generated. | |
| Default value: 512 | |
| Suggested values: 64, 128, 256, 512, 1024 | |
| Typical range of values: 1 <= Height <= 1024 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 16 | |
| Restriction: Height >= 1 | |
region_to_label always returns 2 (H_MSG_TRUE). The behavior in case of empty input (no regions given) can be set via set_system('no_object_result',<Result>) and the behavior in case of an empty input region via set_system('empty_region_result',<Result>). If necessary, an exception handling is raised.
region_to_label is reentrant and automatically parallelized (on tuple level).
threshold, regiongrowing, connection, expand_region
get_grayval, get_image_pointer1
Image / region / XLD management
