Use quaternion wavelet transform image flow estimation. Is the " Coherent Multiscale Image Processing using Dual-Tree Quaternion Wavelets" implementation. Code is very detailed.

FlowEstimationbyQWT
...................\Coherent Multiscale Image Processing.pdf
...................\Readme.txt
...................\calculate_error_flows.m
...................\collect_phase_data.m
...................\combine_result_3.m
...................\estimate_disparity_4.m
...................\estimate_local_freq_4.m
...................\eval_flow.m
...................\interp_dmap.m
...................\pick_images.m
...................\read_correct_flows.m
...................\read_sequence.m
...................\register_images.m
...................\resize_correct_flows.m
...................\standard_QWT
...................\............\FSfarras.m
...................\............\Icwt2.m
...................\............\Idwt.m
...................\............\Idwt2.m
...................\............\Iicwt2.m
...................\............\Iidwt.m
...................\............\Iidwt2.m
...................\............\Iiqwt2.m
...................\............\Iqwt2.m
...................\............\Iqwt2.m~
...................\............\Readme.txt
...................\............\afb2D.m
...................\............\afb2D_A.m
...................\............\afb3D.m
...................\............\cplx_to_qtrn3D.m
...................\............\cplxdual2D.m
...................\............\cplxdual3D.m
...................\............\cshift.m
...................\............\cshift2D.m
...................\............\cshift3D.m
...................\............\diagonal_qwt_plots.m
...................\............\draw_edge.m
...................\............\draw_edge.m~
...................\............\draw_edge_rt.m
...................\............\draw_wedge_rt_smooth.m
...................\............\dualfilt1.m
...................\............\edge_function_rt.m
...................\............\flip_coeff_signs.m
...................\............\flip_group_coeff_signs.m
...................\............\flip_group_coeff_signs.m~
...................\............\flip_single_coeff_signs.m
...................\............\icplxdual3D.m
...................\............\iqtrn_phase.m
...................\............\iqtrn_phase.m~
...................\............\iqtrndual2D.m
...................\............\iqtrndual3D.m
...................\............\irearrange_qwt_coeff.m
...................\............\irearrange_qwt_coeff.m~
...................\............\makeh1.m
...................\............\pm.m
...................\............\pm4.m
...................\............\pm4inv.m
...................\............\qtrn_phase.m
...................\............\qtrn_phase.m~
...................\............\qtrn_phase_backup.m
...................\............\qtrn_to_cplx3D.m
...................\............\qtrndual2D.m
...................\............\qtrndual3D.m
...................\............\qtrndual3D_plots.m
...................\............\rad2deg.m
...................\............\rearrange_qtrndual2D_coeffs.m~
...................\............\rearrange_qtrndual2D_mag.m
...................\............\rearrange_qwt_coeff.m
...................\............\rearrange_qwt_coeff.m~
...................\............\sfb2D.m
...................\............\sfb2D_A.m
...................\............\sfb3D.m
...................\............\up.m
...................\test_register_images.m
...................\wrap_quaternion_phase.m

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