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DeleteBorderComponents[image]

replaces connected components adjacent to the border in a binary image image with background pixels.

DeleteBorderComponents[m]

replaces components adjacent to the border in a label matrix m with 0.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Options  
CornerNeighbors  
Applications  
Properties & Relations  
See Also
Related Guides
History
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DeleteBorderComponents

DeleteBorderComponents[image]

replaces connected components adjacent to the border in a binary image image with background pixels.

DeleteBorderComponents[m]

replaces components adjacent to the border in a label matrix m with 0.

Details and Options

Examples

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Basic Examples  (2)

Deleting components connected to the image border in a binary image:

Wolfram Language code: DeleteBorderComponents[[image]]

Deleting components connected to the border of a 3D image:

Wolfram Language code: DeleteBorderComponents[[image]]

Scope  (1)

Deleting the border component from a label matrix:

Wolfram Language code: DeleteBorderComponents[ (⁠| | | | | | - | - | - | - | | 0 | 0 | 0 | 0 | | 0 | 1 | 0 | 0 | | 0 | 0 | 0 | 0 | | 0 | 0 | 0 | 2 |⁠)]//MatrixForm

Options  (1)

CornerNeighbors  (1)

By default, 8-connectivity is assumed:

Wolfram Language code: DeleteBorderComponents[[image]]

Assume 4-connectivity for computing the components:

Wolfram Language code: DeleteBorderComponents[[image], CornerNeighbors -> False]

Applications  (1)

Create a texture image by periodically padding a single pattern:

Wolfram Language code: pattern = [image];
Wolfram Language code: ii = ImageCrop[pattern, {100, 80}, Padding -> "Periodic"]

Remove patterns that are adjacent to the border and therefore are incomplete:

Wolfram Language code: DeleteBorderComponents[ii]

Properties & Relations  (2)

When deleting border components from a label matrix, components are not relabeled:

Wolfram Language code: DeleteBorderComponents[ (⁠| | | | | | | - | - | - | - | - | | 0 | 0 | 0 | 0 | 1 | | 0 | 2 | 2 | 0 | 0 | | 0 | 0 | 0 | 0 | 3 | | 0 | 4 | 4 | 0 | 0 | | 0 | 0 | 0 | 0 | 5 |⁠)]//MatrixForm

It is also possible to obtain the same effect by masking the border, then using GeodesicDilation:

Wolfram Language code: i = [image]; {w, h} = ImageDimensions[i]; a = ImageMultiply[ImagePad[ConstantImage[Black, {w, h} - 2], 1, White], i] i - GeodesicDilation[a, i]
Wolfram Research (2010), DeleteBorderComponents, Wolfram Language function, https://reference.wolfram.com/language/ref/DeleteBorderComponents.html (updated 2012).

Text

Wolfram Research (2010), DeleteBorderComponents, Wolfram Language function, https://reference.wolfram.com/language/ref/DeleteBorderComponents.html (updated 2012).

CMS

Wolfram Language. 2010. "DeleteBorderComponents." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2012. https://reference.wolfram.com/language/ref/DeleteBorderComponents.html.

APA

Wolfram Language. (2010). DeleteBorderComponents. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DeleteBorderComponents.html

BibTeX

@misc{reference.wolfram_2026_deletebordercomponents, author="Wolfram Research", title="{DeleteBorderComponents}", year="2012", howpublished="\url{https://reference.wolfram.com/language/ref/DeleteBorderComponents.html}", note=[Accessed: 05-October-2026]}

BibLaTeX

@online{reference.wolfram_2026_deletebordercomponents, organization={Wolfram Research}, title={DeleteBorderComponents}, year={2012}, url={https://reference.wolfram.com/language/ref/DeleteBorderComponents.html}, note=[Accessed: 05-October-2026]}