gray_erosion_rect🔗
Short description🔗
gray_erosion_rect — Determine the minimum gray value within a rectangle.
Signature🔗
gray_erosion_rect( image Image, out image ImageMin, extent.y MaskHeight, extent.x MaskWidth )
Description🔗
gray_erosion_rect calculates the minimum gray value of the input
image Image within a rectangular mask of size
(MaskHeight, MaskWidth) for each image point.
The resulting image is returned in ImageMin. If the
parameters MaskHeight or MaskWidth are even,
they are changed to the next larger odd value. At the border of the
image the gray values are mirrored.
Attention🔗
Note that filter operators may return unexpected results if an image with a reduced domain is used as input. Please refer to the chapter Filters.
Execution information🔗
Execution information
-
Supports OpenCL compute devices.
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Multithreading type: reentrant (runs in parallel with non-exclusive operators).
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Multithreading scope: global (may be called from any thread).
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Automatically parallelized on tuple level.
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Automatically parallelized on channel level.
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Automatically parallelized on domain level.
Parameters🔗
Image (input_object) (multichannel-)image(-array) → object (byte / direction / cyclic / uint2 / int2 / int4 / real)
Image for which the minimum gray values are to be calculated.
ImageMin (output_object) (multichannel-)image(-array) → object (byte / direction / cyclic / uint2 / int2 / int4 / real)
Image containing the minimum gray values.
MaskHeight (input_control) extent.y → (integer)
Height of the filter mask.
Default: 11
Suggested values: 3, 5, 7, 9, 11, 13, 15
Value range: 3 ≤ MaskHeight ≤ 511 (lin)
Minimum increment: 2
Recommended increment: 2
Restriction: odd(MaskHeight) && MaskHeight < height(Image) * 2
MaskWidth (input_control) extent.x → (integer)
Width of the filter mask.
Default: 11
Suggested values: 3, 5, 7, 9, 11, 13, 15
Value range: 3 ≤ MaskWidth ≤ 511 (lin)
Minimum increment: 2
Recommended increment: 2
Restriction: odd(MaskWidth) && MaskWidth < width(Image) * 2
Result🔗
gray_erosion_rect returns 2 (H_MSG_TRUE) if all parameters are correct.
If the input is empty the behavior can be set via
set_system('no_object_result',<Result>).
If necessary, an exception is raised.
Combinations with other operators🔗
Module🔗
Foundation