laplacian               package:rimage               R Documentation

_L_a_p_l_a_c_i_a_n _o_f _i_m_a_g_e

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

     Calculate 2nd derivative of image for edge extraction

_U_s_a_g_e:

     laplacian(img)

_A_r_g_u_m_e_n_t_s:

     img: target image

_V_a_l_u_e:

     an object of pixmap class whose the size is as same as target

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

       data(logo)
       plot(normalize(laplacian(logo)))

