x3ptools (version 0.0.4)

x3p_sample: Sample from an x3p object

Description

Sample from an x3p object

Usage

x3p_sample(x3p, m = 2, mY = m, offset = 0, offsetY = offset)
sample_x3p(x3p, m = 2, mY = m, offset = 0, offsetY = offset)

Value

down-sampled x3p object

Arguments

x3p

x3p object

m

integer value - every mth value is included in the sample

mY

integer value - every mth value is included in the sample in x direction and every mYth value is included in y direction

offset

integer value between 0 and m-1 to specify offset of the sample

offsetY

integer value between 0 and mY-1 to specify different offsets for x and y direction

Examples

logo <- x3p_read(system.file("csafe-logo.x3p", package="x3ptools"))
dim(logo$surface.matrix)
# down-sample to one-fourth of the image:
logo4 <- x3p_sample(logo, m=4)
dim(logo4$surface.matrix)
if (FALSE) {
x3p_image(logo)
x3p_image(logo4)
}