extract_patches: Extract image patches and return a list

In imager: Image Processing Library Based on 'CImg'

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 documentation built on May 29, 2024, 1:38 a.m.