49 lines
1.6 KiB
Matlab
49 lines
1.6 KiB
Matlab
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% GTSAM Copyright 2010, Georgia Tech Research Corporation,
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% Atlanta, Georgia 30332-0415
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% All Rights Reserved
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% Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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%
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% See LICENSE for the license information
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%
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% @brief Read graph from file and perform GraphSLAM
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% @author Frank Dellaert
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Create a hexagon of poses
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hexagon = pose2SLAMValues_Circle(6,1.0);
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p0 = hexagon.pose(0);
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p1 = hexagon.pose(1);
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%% create a Pose graph with one equality constraint and one measurement
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fg = pose2SLAMGraph;
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fg.addPoseConstraint(0, p0);
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delta = p0.between(p1);
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covariance = gtsamSharedNoiseModel_Sigmas([0.05; 0.05; 5*pi/180]);
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fg.addOdometry(0,1, delta, covariance);
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fg.addOdometry(1,2, delta, covariance);
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fg.addOdometry(2,3, delta, covariance);
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fg.addOdometry(3,4, delta, covariance);
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fg.addOdometry(4,5, delta, covariance);
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fg.addOdometry(5,0, delta, covariance);
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%% Create initial config
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initial = pose2SLAMValues;
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initial.insertPose(0, p0);
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initial.insertPose(1, hexagon.pose(1).retract([-0.1, 0.1,-0.1]'));
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initial.insertPose(2, hexagon.pose(2).retract([ 0.1,-0.1, 0.1]'));
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initial.insertPose(3, hexagon.pose(3).retract([-0.1, 0.1,-0.1]'));
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initial.insertPose(4, hexagon.pose(4).retract([ 0.1,-0.1, 0.1]'));
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initial.insertPose(5, hexagon.pose(5).retract([-0.1, 0.1,-0.1]'));
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%% Plot Initial Estimate
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figure(1);clf
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plot(initial.xs(),initial.ys(),'g-*'); axis equal
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%% optimize
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result = fg.optimize(initial);
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%% Show Result
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hold on; plot(result.xs(),result.ys(),'b-*')
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result.print(sprintf('\nFinal result:\n'));
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