gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShape (Operator)

Name

gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShape — Perform a gray value closing with a selected mask.

Signature

Description

gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape applies a gray value closing to the input image ImageImageImageImageimage with the structuring element of shape MaskShapeMaskShapeMaskShapeMaskShapemaskShape. The mask's offset values are 0 and its horizontal and vertical size is defined by MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight and MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth. The resulting image is returned in ImageClosingImageClosingImageClosingImageClosingimageClosing.

If the parameters MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight or MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth are of the type integer and are even, they are changed to the next larger odd value. In contrast, if at least one of the two parameters is of the type float, the input image ImageImageImageImageimage is transformed with both the next larger and the next smaller odd mask size, and the output image ImageClosingImageClosingImageClosingImageClosingimageClosing is interpolated from the two intermediate images. Therefore, note that gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape returns different results for mask sizes of, e.g., 4 and 4.0!

In case of the values 'rhombus' and 'octagon' for the MaskShapeMaskShapeMaskShapeMaskShapemaskShape control parameter, MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight and MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth must be equal. The parameter value 'octagon' for MaskShapeMaskShapeMaskShapeMaskShapemaskShape denotes an equilateral octagonal mask which is a suitable approximation for a circular structure. At the border of the image the gray values are mirrored.

The gray value closing of an image i with a structuring element s is defined as i.e., a dilation of the image with s followed by an erosion with s (see gray_dilation_shapegray_dilation_shapeGrayDilationShapeGrayDilationShapeGrayDilationShape and gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape).

Attention

Note that gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape requires considerably more time for mask sizes of type float than for mask sizes of type integer. This is especially true for rectangular masks with different width and height!

gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape can be executed on OpenCL devices. In case of mask sizes of type float the result can vary slightly from the CPU as the interpolation is calculated in single precision on the OpenCL device.

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

Result

gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape returns 2 (H_MSG_TRUE) if all parameters are correct.

Alternatives

gray_closinggray_closingGrayClosingGrayClosingGrayClosing

See also

gray_dilation_shapegray_dilation_shapeGrayDilationShapeGrayDilationShapeGrayDilationShape, gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape, closingclosingClosingClosingClosing

Module

Foundation