spatstat (version 1.23-1)

which.max.im: Identify Pixelwise Maximum of Several Pixel Images

Description

Given a list of pixel images, this function identifies the image that has the largest value at each pixel, and returns an image.

Usage

which.max.im(x)

Arguments

x

A list of images (objects of class "im").

Value

• An image (object of class "im") with factor values.

Details

x should be a list of pixel images. All images must have compatible dimensions.

For each pixel, the algorithm identifies which of the images in the list x has the largest value at that pixel. The index of this image becomes the pixel value in the output image. If names(x) is not null, then the indices are replaced by these names.

See Also

eval.im, im.object

Examples

# test images
  X <- as.im(function(x,y) { x^2 - y^2 }, unit.square())
  Y <- as.im(function(x,y) { x - y }, unit.square())
  which.max.im(list(X=X,Y=Y))