

lennon(wavethresh)                           R Documentation

_I_m_a_g_e _o_f _J_o_h_n _L_e_n_n_o_n

_D_e_s_c_r_i_p_t_i_o_n_:

     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.

_A_u_t_h_o_r_(_s_)_:

     R format and 8bit packing by Martin Maechler

_S_o_u_r_c_e_:

     From Guy Nason, G.P.Nason@bristol.ac.uk

_E_x_a_m_p_l_e_s_:

     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))

