Table 1 Twenty-seven feature parameters

|s _hh|² + 2|s _hv|² + |s _vv|²

\( \left|\frac{\left\langle {s}_{\mathrm{hh}}{s}_{\mathrm{vv}}^{\ast}\right\rangle }{\sqrt{{\left|{s}_{\mathrm{hh}}\right|}^2{\left|{s}_{\mathrm{vv}}\right|}^2}}\right| \)

10 log(|s _hv|²/|s _vv|²)

10 log(|s _vv|²/|s _hh|²)

10 log(|s _hv|²/|s _hh|²)

\( \left\langle {s}_{\mathrm{hh}}{s}_{\mathrm{hh}}^{\ast}\right\rangle \)

\( \left\langle {s}_{\mathrm{vv}}{s}_{\mathrm{vv}}^{\ast}\right\rangle \)

\( \left\langle {s}_{\mathrm{hv}}{s}_{\mathrm{hv}}^{\ast}\right\rangle \)

\( \arg \left(\left\langle {s}_{\mathrm{hh}}{s}_{\mathrm{vv}}^{\ast}\right\rangle \right) \)

\( \arg \left(\left\langle {s}_{\mathrm{hh}}{s}_{\mathrm{hv}}^{\ast}\right\rangle \right) \)

\( \arg \left(\left\langle {s}_{\mathrm{hv}}{s}_{\mathrm{vv}}^{\ast}\right\rangle \right) \)

|a|², |b|², |c|²

k _s , k _d , k _h

H, ∂, A

P _s , P _d , P _v

f _h , f _s , f _d , f _v