R: Apply Function Pixelwise to List of Images

im.apply {spatstat} | R Documentation

## Apply Function Pixelwise to List of Images

### Description

Returns a pixel image obtained by applying a function to the values of corresponding pixels in several pixel images.

### Usage

    im.apply(X, FUN, ...)

### Arguments

`X` | A list of pixel images (objects of class `"im"`).
`FUN` | A function that can be applied to vectors, or a character string giving the name of such a function.
`...` | Additional arguments to `FUN`.

### Details

The argument `X` should be a list of pixel images (objects of class `"im"`). If the images do not have identical pixel grids, they will be converted to a common grid using `harmonise.im`.

At each pixel location, the values of the images in `X` at that pixel will be extracted as a vector. The function `FUN` will be applied to this vector. The result (which should be a single value) becomes the pixel value of the resulting image.

### Value

A pixel image (object of class `"im"`).

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

### See Also

`eval.im` for algebraic operations with images.

### Examples

      DA <- density(split(amacrine))
      DA
      im.apply(DA, max)

[Package spatstat version 1.54-0 Index]