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Competitive Collaboration: Joint Unsupervised Learning of Depth, Camera Motion, Optical Flow and Motion Segmentation

CVPR 2019 · 3D vision › Depth and stereo · approach: Learned optical and scene flow · 674 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Jointly train depth, camera motion, and flow using Competitive Collaboration (ablation)CC depth model · KITTI Eigen splitAbsRel: 0.168 -> {0.148}Helped
Add SSIM loss (ablation)Basic DispNet depth model · KITTI Eigen splitAbsRel: 0.184 -> 0.168Helped
Replace DispNet with DispResNet (ablation)CC depth model with FlowNetC · KITTI Eigen splitAbsRel: 0.148 -> 0.144Helped
Replace FlowNetC with PWC Net (ablation)CC depth model with DispResNet · KITTI Eigen splitAbsRel: 0.144 -> {0.140}Helped
Add Cityscapes training data (ablation)CC depth model · KITTI Eigen splitAbsRel: {0.140} -> \textbf{0.139}Helped
Use joint CC instead of training static and moving-region reconstructors independently (ablation)Optical flow estimation · KITTI 2015 training set, all pixelsEPE: 13.54; 14.68 -> 7.76Helped
Use DispResNet and PWC Net instead of DispNet and FlowNetC (ablation)CC optical flow model · KITTI 2015 training set, all pixelsEPE: 7.76 -> 6.21Helped
Fine-tune CC unsupervised with lambda_M=0.02 (ablation)CC optical flow model · KITTI 2015 training setEPE: 6.21 -> 5.66Helped
Combine MaskNet and flow-consensus masks (ablation)Motion segmentation · KITTI 2015 training set, car pixelsOverall IoU: 41.64 / 51.52 -> 56.94Helped
Share the encoder between camera-motion and motion-segmentation networks (ablation)Camera motion estimation · KITTI Odometry Sequence 09Absolute Trajectory Error: 0.012 $\pm$ 0.007 -> 0.017 $\pm$ 0.009Hurt
Share the encoder between camera-motion and motion-segmentation networks (ablation)Camera motion estimation · KITTI Odometry Sequence 10Absolute Trajectory Error: 0.012 $\pm$ 0.008 -> 0.015 $\pm$ 0.009Hurt
Use CC instead of independent basic training (ablation)Depth and camera-motion estimation · KITTI Eigen splitAbsRel: 0.168 -> {0.148}Helped

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