gray_opening_rectgray_opening_rectGrayOpeningRectGrayOpeningRect (Operator)

Name

gray_opening_rectgray_opening_rectGrayOpeningRectGrayOpeningRect — Perform a gray value opening with a rectangular mask.

Signature

gray_opening_rect(Image : ImageOpening : MaskHeight, MaskWidth : )

Description

gray_opening_rectgray_opening_rectGrayOpeningRectGrayOpeningRectGrayOpeningRect applies a gray value opening to the input image ImageImageImageImageimage with a rectangular mask of size (MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight, MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth). The resulting image is returned in ImageOpeningImageOpeningImageOpeningImageOpeningimageOpening. If the parameters MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight or MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth are even, they are changed to the next larger odd value. At the border of the image the gray values are mirrored.

The gray value opening of an image i with a rectangular structuring element s is defined as i.e., an erosion of the image with s followed by a dilation with s (see gray_erosion_rectgray_erosion_rectGrayErosionRectGrayErosionRectGrayErosionRect and gray_dilation_rectgray_dilation_rectGrayDilationRectGrayDilationRectGrayDilationRect).

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

Supports OpenCL compute devices.
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Automatically parallelized on channel level.
Automatically parallelized on domain level.

Parameters

ImageImageImageImageimage (input_object) (multichannel-)image(-array) → object (byte / direction / cyclic / uint2 / int2 / int4 / real)

Input image.

ImageOpeningImageOpeningImageOpeningImageOpeningimageOpening (output_object) (multichannel-)image(-array) → object (byte / direction / cyclic / uint2 / int2 / int4 / real)

Gray-opened image.

MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight (input_control) extent.y → (integer)

Height of the filter mask.

Default value: 11

Suggested values: 3, 5, 7, 9, 11, 13, 15

Typical range of values: 3 ≤ MaskHeight MaskHeight MaskHeight MaskHeight maskHeight ≤ 511

Minimum increment: 2

Recommended increment: 2

Restriction: odd(MaskHeight) && MaskHeight < height(Image) * 2

MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth (input_control) extent.x → (integer)

Width of the filter mask.

Default value: 11

Suggested values: 3, 5, 7, 9, 11, 13, 15

Typical range of values: 3 ≤ MaskWidth MaskWidth MaskWidth MaskWidth maskWidth ≤ 511

Minimum increment: 2

Recommended increment: 2

Restriction: odd(MaskWidth) && MaskWidth < width(Image) * 2

Result

gray_opening_rectgray_opening_rectGrayOpeningRectGrayOpeningRectGrayOpeningRect 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>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If necessary, an exception is raised.

Alternatives

gray_openinggray_openingGrayOpeningGrayOpeningGrayOpening, gray_opening_shapegray_opening_shapeGrayOpeningShapeGrayOpeningShapeGrayOpeningShape

Module

Foundation

Operators