Comments on "Compact Polarimetry Based on Symmetry Properties of Geophysical Media: The$pi/4$Mode

For original paper see Souyris et al., ibid., vol.43, no.3, p.634 (2005). In their paper Souyris et al. discussed the pi/4 mode of polarimetric SAR. Weizu Xiong feels that the calibration model used by Souyris et al. may be wrong and derives a calibration model using polar theory