dilate3x3

rlemasklib.RLEMask.dilate3x3(connectivity=4, inplace=False)

Dilate a mask with a 3x3 kernel.

After dilation, all pixels that were foreground before remain foreground and additionally any pixel with at least one foreground neighbor (according to the specified connectivity, 4-way or 8-way) becomes also foreground.

The kernel shape depends on connectivity:

connectivity=4: connectivity=8:

At the image border, pixels are treated as if the mask was extended by replicating the edge values. This means dilation does not extend beyond the image boundary.

Parameters:

• connectivity (int) – either 4 or 8, the connectivity of the dilation. 4 means a cross-shaped kernel, 8 means a square kernel.

• inplace (bool) – whether to perform the operation in place or to return a new object

Returns:

The RLEMask object representing the dilated mask (self if inplace=True)

Return type:

RLEMask

Examples

A single pixel dilates into the kernel shape:

.dilate3x3(connectivity=4) ==

.dilate3x3(connectivity=8) ==

See also

dilate() for arbitrary kernel shapes. dilate5x5() for a 5x5 kernel.