LS2Wstat (version 2.1-5)

mix2images: Insert one image into another.

Description

Image A is re-sized to a specified proportion of Image B, then inserted into Image B at a given position.

Usage

mix2images(imageA, imageB, prop = 0.25, pos = "e")

Value

ImageB

A matrix with the specified values selected exchanged to those of Image A.

Arguments

imageA

The first image which is resized and placed inside the second image.

imageB

The second image, into which the first is placed.

prop

The proportion of Image B to be taken up by Image A.

pos

The exact position of image A in image B. Possible options are "a", "b", "c", "d", "e" which corresponds to (a) top-right, (b) bottom-right, (c) top-left, (d) bottom-left and (e) centred. A more exact location may be specified by inputting pos=c(x,y), which represents the position in pixels from the top-left of the image (i.e. c(x,y) puts Image A x pixels down and y pixels across from the top-left corner of Image B.)

Author

Sarah L. Taylor

Details

This function first of all crops Image A to be a given proportion of Image B and then inserts it into image B at the specified location. If image B is too small for the size of image A required then the whole of image A is placed in image B. Both must be dyadic in length and square images.

References

Taylor, S.L., Eckley, I.A., and Nunes, M.A. (2014) A Test of Stationarity for Textured Images. Technometrics, 56 (3), 291-301.

Examples

# Generate 2 images.
#
ImageA <- matrix(rnorm(256^2), nrow=256, ncol=256)
ImageB <- matrix(rnorm(256^2, sd=2.8), nrow=256, ncol=256)
#
# Insert Image A into Image B at a proportion of 0.25
#
MixImaImb <- mix2images(ImageA, ImageB, prop=0.25, pos="e")
#