spatstat (version 1.4-3)

im: Create a Pixel Image Object

Description

Creates an object of class "im" representing a two-dimensional pixel image.

Usage

im(mat, xcol=seq(ncol(mat)), yrow=seq(nrow(mat)))

Arguments

mat

matrix of grey level pixel values of the image.

xcol

vector of $x$ coordinates for the pixels

yrow

vector of $y$ coordinates for the pixels

Warnings

The internal representation of images is likely to change in the next release of this package.

Details

This function creates an object of class "im" representing a two-dimensional pixel image. See im.object for details of this class.

Note that the row index of the matrix mat corresponds to increasing y coordinate, while the column index of mat corresponds to increasing x coordinate. Thus xrow has one entry for each row of mat and ycol has one entry for each column of mat. A correct display of the image would be obtained by transposing, e.g. image.default(xcol, yrow, t(mat)), if you wanted to do it by hand.

See Also

im.object, Kmeasure, setcov

Examples

whitenoise <- im(matrix(rnorm(10000, 100, 100)))
   image(whitenoise)