wavethresh (version 2.2-6)

lennon: Image of John Lennon

Description

The lennon matrix has 256 rows and 256 columns and integer values in 0:192 which are inverted image gray scales, i.e., 0 means white and 192 is dark. There are a few dark speckles on the image.

John Lennon (19xx-19xx) was the composer/leader of the legendary Beatles.

source

From Guy Nason, [e-mail]

Examples

data(lennon)
str(lennon)

tlennon <- table(lennon)
plot(names(tlennon), sqrt(tlennon), type = "h",
     ylab = "tlennon __ sqrt scaled", yaxt = "n",
     main = "Gray value distribution of `Lennon'")
atl <- pretty(tlennon, 8)
axis(2, at=sqrt(atl), labels = formatC(atl,wid=1), las=2)

image(lennon, zlim = c(0, 192), col = gray(127:0/128))# white to dark
image(lennon, zlim = c(-10, 240), col = gray(127:0/128))