gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShape (Operator)


gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShape — Determine the minimum gray value within a selected mask.


gray_erosion_shape(Image : ImageMin : MaskHeight, MaskWidth, MaskShape : )

Herror gray_erosion_shape(const Hobject Image, Hobject* ImageMin, double MaskHeight, double MaskWidth, const char* MaskShape)

Herror T_gray_erosion_shape(const Hobject Image, Hobject* ImageMin, const Htuple MaskHeight, const Htuple MaskWidth, const Htuple MaskShape)

void GrayErosionShape(const HObject& Image, HObject* ImageMin, const HTuple& MaskHeight, const HTuple& MaskWidth, const HTuple& MaskShape)

HImage HImage::GrayErosionShape(const HTuple& MaskHeight, const HTuple& MaskWidth, const HString& MaskShape) const

HImage HImage::GrayErosionShape(double MaskHeight, double MaskWidth, const HString& MaskShape) const

HImage HImage::GrayErosionShape(double MaskHeight, double MaskWidth, const char* MaskShape) const

HImage HImage::GrayErosionShape(double MaskHeight, double MaskWidth, const wchar_t* MaskShape) const   (Windows only)

static void HOperatorSet.GrayErosionShape(HObject image, out HObject imageMin, HTuple maskHeight, HTuple maskWidth, HTuple maskShape)

HImage HImage.GrayErosionShape(HTuple maskHeight, HTuple maskWidth, string maskShape)

HImage HImage.GrayErosionShape(double maskHeight, double maskWidth, string maskShape)


gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape calculates the minimum gray value of the input image ImageImageImageImageimage within a mask of shape MaskShapeMaskShapeMaskShapeMaskShapemaskShape, vertical size MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight and horizontal size MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth for each image point. The resulting image is returned in ImageMinImageMinImageMinImageMinimageMin.

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 ImageMinImageMinImageMinImageMinimageMin is interpolated from the two intermediate images. Therefore, note that gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape 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.


Note that gray_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape 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_erosion_shapegray_erosion_shapeGrayErosionShapeGrayErosionShapeGrayErosionShape 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


ImageImageImageImageimage (input_object)  (multichannel-)image(-array) objectHImageHImageHobject (byte* / uint2*) *allowed for compute devices

Image for which the minimum gray values are to be calculated.

ImageMinImageMinImageMinImageMinimageMin (output_object)  (multichannel-)image(-array) objectHImageHImageHobject * (byte / uint2)

Image containing the minimum gray values.

MaskHeightMaskHeightMaskHeightMaskHeightmaskHeight (input_control)  extent.y HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Height of the filter mask.

Default value: 11

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

Typical range of values: 1.0 ≤ MaskHeight MaskHeight MaskHeight MaskHeight maskHeight

MaskWidthMaskWidthMaskWidthMaskWidthmaskWidth (input_control)  extent.x HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Width of the filter mask.

Default value: 11

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

Typical range of values: 1.0 ≤ MaskWidth MaskWidth MaskWidth MaskWidth maskWidth

MaskShapeMaskShapeMaskShapeMaskShapemaskShape (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Shape of the mask.

Default value: 'octagon' "octagon" "octagon" "octagon" "octagon"

List of values: 'octagon'"octagon""octagon""octagon""octagon", 'rectangle'"rectangle""rectangle""rectangle""rectangle", 'rhombus'"rhombus""rhombus""rhombus""rhombus"


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


gray_erosiongray_erosionGrayErosionGrayErosionGrayErosion, gray_erosion_rectgray_erosion_rectGrayErosionRectGrayErosionRectGrayErosionRect

See also

gray_opening_shapegray_opening_shapeGrayOpeningShapeGrayOpeningShapeGrayOpeningShape, gray_closing_shapegray_closing_shapeGrayClosingShapeGrayClosingShapeGrayClosingShape, gray_skeletongray_skeletonGraySkeletonGraySkeletonGraySkeleton