shrink.image: Image Processing
In adimpro: Adaptive Smoothing of Digital Images

shrink.image

R Documentation

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.