  We carry out CCD photometry of galaxies in the 5.25 square region centered on
Coma cluster down to $M_R=-16.0$, beyond the limit of conventional
morphological classification. We use the angular two-point correlation function
as well as radial profiles in order to characterize the luminosity segregation.
We find strong luminosity segregation for our total sample over the magnitude
range of $-20 \leq M_R \leq -16$, which is not entirely accounted for in terms
of the morphology-density relation that is known to exist only for bright
galaxies. We use a single consistent parameter, the degree of luminosity
concentration, to parameterize the morphology of galaxies over the wide
magnitude range, where both giant and dwarf galaxies are included. Galaxies
with high central concentration (HCC) show strong luminosity segregation, i.e.
their clustering strength depends strongly on luminosity while those with low
central concentration (LCC) show almost no luminosity segregation. Radial
density profile shows that brighter HCC-type galaxies tend to more strongly
concentrate near the cluster center while LCC-type galaxies do not show such a
dependence on luminosity. We show that these results are tenable against the
contamination by field galaxies and uncertainties in our method of
classification.
