  Polarization speckle is a fine granular light pattern having spatially
varying random polarization profile. We generate these speckle patterns by
using the scattering of Poincar\'e beams, a special class of vector vortex
beams, through a ground glass plate. Here, the Poincar\'e beams are generated
using a polarization sensitive spatial light modulator displaying an on-axis
hologram corresponding to an optical vortex phase profile. The different
inhomogeneities of the rough surface experience different polarizations, which
control the ability for scattered waves to interfere at the detection plane and
causes a spatially varying polarization profile. We experimentally determined
the spatial variation of local degree of polarization and orientation of the
polarization ellipse for these speckle patterns from the Stokes analysis. We
also determined the size of scalar speckles using the auto-correlation function
of Stokes parameter S0 and the size of polarization speckles using the sum of
auto-correlation functions of remaining three Stokes parameters. We found that
the scalar speckle size is independent of index of the vector beam but the size
of polarization speckles decreases with the increase in index of the vector
beam.
