imager: imsharpen – R documentation

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imsharpen

Sharpen image.

The default sharpening filter is inverse diffusion. The "shock filter" is a non-linear diffusion that has better edge-preserving properties.

imsharpen(im, amplitude, type = "diffusion", edge = 1, alpha = 0, sigma = 0)

`im`	an image
`amplitude`	Sharpening amplitude (positive scalar, 0: no filtering).
`type`	Filtering type. "diffusion" (default) or "shock"
`edge`	Edge threshold (shock filters only, positive scalar, default 1).
`alpha`	Window size for initial blur (shock filters only, positive scalar, default 0).
`sigma`	Window size for diffusion tensor blur (shock filters only, positive scalar, default 0).

layout(t(1:2))
plot(boats,main="Original")
imsharpen(boats,150)  %>% plot(main="Sharpened")

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