shrink.image: Image Processing

In adimpro: Adaptive Smoothing of Digital Images

Image Processing

Description

Shrink resolution of an image

Usage

shrink.image(img, method = "median",
             xt = img$dim[1], yt = img$dim[2], ratio = TRUE,
             compress=TRUE)

Arguments

img	image data, an object of class "adimpro".
method	method to be used to shrink the image. "median" (default), "mean", or "nearest". "median" is supposed to give best results. For a considerably faster result use "nearest".
xt	target x-dimension
yt	target y-dimension
ratio	logical. preserve x-y ratio? default: TRUE
compress	logical, determines if image data are stored in raw-format.

Details

This function shrinkes the resolution of the image such that the x-y dimension of the resulting image is smaller than the original one. xt and yt give the target dimension of the image. If ratio == TRUE (default) the ratio between x- and y-dimension is preserved.

method "nearest" selects a pixel nearest to the new coordinates. method "mean" defines the color of a pixel as the mean of all pixel identified with the new coordinate. method "median" set the color of a pixel as color of an L1-generalized median of all pixel identified with the new coordinate.

Value

shrinked image

Author(s)

Karsten Tabelow [e-mail] and Joerg Polzehl [e-mail]

Examples

## Not run: demo(manipulate)

adimpro documentation built on Sept. 8, 2023, 5:53 p.m.