resize_uniform: Resize image uniformly

In imager: Image Processing Library Based on 'CImg'

Resize image uniformly

Description

Resize image by a single scale factor. For non-uniform scaling and a wider range of options, see resize.

Usage

resize_doubleXY(im)

resize_halfXY(im)

resize_tripleXY(im)

imresize(im, scale = 1, interpolation = 3)

Arguments

im	an image
scale	a scale factor
interpolation	interpolation method to use (see doc for resize). Default 3, linear. Set to 5 for cubic, 6 for Lanczos (higher quality).

Value

an image

Functions

• resize_doubleXY(): Double size

• resize_halfXY(): Half size

• resize_tripleXY(): Triple size

• imresize(): resize by scale factor

Author(s)

Simon Barthelme

References

For double-scale, triple-scale, etc. uses an anisotropic scaling algorithm described in: http://www.scale2x.it/algorithm.html. For half-scaling uses what the CImg doc describes as an "optimised filter", see resize_halfXY in CImg.h.

See Also

resize

Examples

im <- load.example("parrots")
imresize(im,1/4) #Quarter size
map_il(2:4,~ imresize(im,1/.)) %>% imappend("x") %>% plot

imager documentation built on May 31, 2023, 8:56 p.m.