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69 lines
3.0 KiB
Matlab
69 lines
3.0 KiB
Matlab
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% GoldsteinUnwrap2D implements 2D Goldstein branch cut phase unwrapping algorithm.
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%
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% References::
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% 1. R. M. Goldstein, H. A. Zebken, and C. L. Werner, �Satellite radar interferometry:
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% Two-dimensional phase unwrapping,� Radio Sci., vol. 23, no. 4, pp. 713�720, 1988.
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% 2. D. C. Ghiglia and M. D. Pritt, Two-Dimensional Phase Unwrapping:
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% Theory, Algorithms and Software. New York: Wiley-Interscience, 1998.
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%
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% Inputs: 1. Complex image in .mat double format
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% 2. Binary mask (optional)
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% Outputs: 1. Unwrapped phase image
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% 2. Phase quality map
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%
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% This code can easily be extended for 3D phase unwrapping.
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% Posted by Bruce Spottiswoode on 22 December 2008
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Copyright (c) 2008, Bruce Spottiswoode
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions are
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% met:
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%
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% * Redistributions of source code must retain the above copyright
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% notice, this list of conditions and the following disclaimer.
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% * Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in
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% the documentation and/or other materials provided with the distribution
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% * Neither the name of the University of Cape Town nor the names
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% of its contributors may be used to endorse or promote products derived
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% from this software without specific prior written permission.
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%
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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% POSSIBILITY OF SUCH DAMAGE.
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function [unph] = goldstein_unwrap2D(a, max_box_radius)
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IM=a;
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IM_mask=ones(size(IM)); %Mask (if applicable)
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IM_mag=abs(IM); %Magnitude image
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IM_phase=angle(IM); %Phase image
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% Unwrap
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residue_charge=PhaseResidues(IM_phase, IM_mask); %Calculate phase residues
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branch_cuts=BranchCuts(residue_charge, max_box_radius, IM_mask); %Place branch cuts
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[IM_unwrapped, rowref, colref]=FloodFill(IM_phase, branch_cuts, IM_mask); %Flood fill phase unwrapping
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unph=IM_unwrapped;
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end
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