imager: extract_patches – R documentation

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extract_patches

Extract image patches and return a list

Description

Patches are rectangular (cubic) image regions centered at cx,cy (cz) with width wx and height wy (opt. depth wz) WARNINGS: - values outside of the image region are subject to boundary conditions. The default is to set them to 0 (Dirichlet), other boundary conditions are listed below. - widths and heights should be odd integers (they're rounded up otherwise).

Usage

extract_patches(im, cx, cy, wx, wy, boundary_conditions = 0L)

extract_patches3D(im, cx, cy, cz, wx, wy, wz, boundary_conditions = 0L)

Arguments

`im`	an image
`cx`	vector of x coordinates for patch centers
`cy`	vector of y coordinates for patch centers
`wx`	vector of patch widths (or single value)
`wy`	vector of patch heights (or single value)
`boundary_conditions`	integer. Can be 0 (Dirichlet, default), 1 (Neumann) 2 (Periodic) 3 (mirror).
`cz`	vector of z coordinates for patch centers
`wz`	vector of coordinates for patch depth

Value

a list of image patches (cimg objects)

Functions

extract_patches3D: Extract 3D patches

Examples

#2 patches of size 5x5 located at (10,10) and (10,20)
extract_patches(boats,c(10,10),c(10,20),5,5)

imager

Image Processing Library Based on 'CImg'

v0.42.10

LGPL-3

Authors

Simon Barthelme [aut], David Tschumperle [ctb], Jan Wijffels [ctb], Haz Edine Assemlal [ctb], Shota Ochi [cre]

Initial release