基于元学习的双目深度估计在线适应算法

张振宇; 杨健

doi:10.16383/j.aas.c200286

基于元学习的双目深度估计在线适应算法

doi: 10.16383/j.aas.c200286

张振宇^{1, 2, 3,},
杨健^{1, 2, 3,}

1.
高维信息与感知教育部重点实验室南京 210094
2.
江苏省社会安全图像与视频理解重点实验室南京 210094
3.
南京理工大学计算机科学与工程学院PCA实验室南京 210094

基金项目: 国家自然科学基金(U1713208)资助

详细信息

作者简介:
张振宇：南京理工大学计算机科学与工程学院PCA 实验室博士研究生. 2015年获得南京理工大学理学院信息与计算科学系学士学位. 主要研究方向为基于视觉的深度估计方法, 深度学习算法. E-mail: zhangjesse@njust.edu.cn

杨健：南京理工大学计算机科学与工程学院教授, 长江学者, IAPR Fellow. 主要研究方向为矩阵回归, 自动驾驶和机器人场景的视觉感知. 本文通信作者. E-mail: csjyang@njust.edu.cn

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出版历程
- 收稿日期: 2020-05-07
- 录用日期: 2020-09-14
- 网络出版日期: 2021-07-05
- 刊出日期: 2023-07-20

Online Adaptation Through Meta-learning for Stereo Depth Estimation

ZHANG Zhen-Yu^{1, 2, 3
,},
YANG Jian^{1, 2, 3
,}

1.
Key Laboratory of Intelligent Perception and Systems for High-dimensional Information of Ministry of Education, Nanjing 210094
2.
Jiangsu Key Laboratory of Image and Video Understanding for Social Security, Nanjing 210094
3.
PCA Laboratory, School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094

Funds: Supported by National Natural Science Foundation of China (U1713208)

More Information

Author Bio:
ZHANG Zhen-Yu　Ph.D. candidate at PCA Laboratory, School ofComputer Science and Engineering, Nanjing University of Science and Technology. He received his bachelor degree in 2015. His research interest covers computer vision and deep learning, specially on depth estimation

YANG Jian　Professor at the School of Computer Science and Engineering, Nanjing University of Science and Technology. He is also a Changjiang Scholar and IAPR Fellow. His research interest covers matrix regression, visual perception in autonomous driving and robotics. Corresponding author of this paper

摘要

摘要: 双目深度估计的在线适应是一个有挑战性的问题, 其要求模型能够在不断变化的目标场景中在线连续地自我调整并适应于当前环境. 为处理该问题, 提出一种新的在线元学习适应算法(Online meta-learning model with adaptation, OMLA), 其贡献主要体现在两方面: 首先引入在线特征对齐方法处理目标域和源域特征的分布偏差, 以减少数据域转移的影响; 然后利用在线元学习方法调整特征对齐过程和网络权重, 使模型实现快速收敛. 此外, 提出一种新的基于元学习的预训练方法, 以获得适用于在线学习场景的深度网络参数. 相关实验分析表明, OMLA和元学习预训练算法均能帮助模型快速适应于新场景, 在KITTI数据集上的实验对比表明, 本文方法的效果超越了当前最佳的在线适应算法, 接近甚至优于在目标域离线训练的理想模型.
- 深度估计 /
- 在线学习 /
- 元学习 /
- 域适应算法 /
- 深度神经网络
Abstract: This work tackles the problem of online adaptation for stereo depth estimation, that consists in continuously adapting a deep network to a target video recorded in an environment different from that of the source training set. To address this problem, we propose a novel online meta-learning model with adaptation (OMLA). Our proposal is based on two main contributions. First, to reduce the domain-shift between source and target feature distributions we introduce an online feature alignment procedure derived from batch normalization. Second, we devise a meta-learning approach that exploits feature alignment for faster convergence in an online learning setting. Additionally, we propose a meta-pre-training algorithm in order to obtain initial network weights on the source dataset which facilitate adaptation on future data streams. Experimentally, we show that both OMLA and meta-pre-training help the model to adapt faster to a new environment. Our proposal is evaluated on the KITTI dataset, where we show that our method outperforms both algorithms trained on the target data in an offline setting and state-of-the-art adaptation methods.
- Depth estimation /
- online learning /
- meta-learning /
- domain adaptation /
- deep neural network

HTML全文

图 1 本文提出的基于元学习的深度估计在线适应算法框架

Fig. 1 The proposed meta-learning framework for online stereo adaptation

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图 2 本文提出的在线元学习适应方法

Fig. 2 The proposed online meta-learning with adaptation (OMLA) method

下载: 全尺寸图片幻灯片

图 3 在KITTI Eigen测试集中3个不同视频序列上的效果 (为了展示模型的在线适应效果随时间的变化, 此处展示了视频初始, 中段和末段时刻的深度估计效果)

Fig. 3 Performance on three different videos of KITTI Eigen test (We illustrated predictions of initial, medium, and last frames)

下载: 全尺寸图片幻灯片

表 1 KITTI Eigen测试集的算法消融实验 (仅评估 50 m之内的深度估计效果)

Table 1 Ablation study on KITTI Eigen test set (the results are evaluated within 50 m)

方法	预训练方式	平均得分				最后 20% 帧的平均得分
方法	预训练方式	RMSE	Abs Rel	Sq Rel	${\rm{RMSE} }_{ {\rm{log} } }$	RMSE	Abs Rel	Sq Rel	${\rm{RMSE} }_{ {\rm{log} } }$
基准方法	无	12.2012	0.4357	5.5672	1.3598	12.2874	0.4452	5.5213	1.3426
基准方法	标准预训练方法	9.0518	0.2499	3.2901	0.9503	9.0309	0.2512	3.3104	0.9495
仅在线特征分布对齐		3.6135	0.1250	0.6972	0.2041	3.5857	0.1031	0.6887	0.1910
OMLA 算法		3.5027	0.0923	0.6611	0.1896	3.3986	0.0882	0.6579	0.1735
基准方法	元预训练方法	8.8230	0.2305	3.0578	0.9324	8.7061	0.2273	2.9804	0.9065
仅在线特征分布对齐		3.5043	0.0950	0.6627	0.1992	3.4831	0.0896	0.6545	0.1921
OMLA 算法		${\bf{ {3.4051}}}$	${\bf{ 0.0864}}$	${\bf{{0.6256}}}$	${\bf{ 0.1852}}$	${\bf{ 3.3803 }}$	${\bf{ 0.0798}}$	${\bf{{0.6176}}}$	${\bf{{0.1801}}}$

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表 2 不同网络模型和数据库上的结果对比

Table 2 Comparison on different network architectures and datasets

网络模型	方法	预训练于 Synthia^[20]				预训练于 Scene Flow Driving^[41]				帧速率 (帧/s)
网络模型	方法	RMSE	Abs Rel	Sq Rel	${\rm{RMSE} }_{ {\rm{log} } }$	RMSE	Abs Rel	Sq Rel	${\rm{RMSE} }_{ {\rm{log} } }$	帧速率 (帧/s)
ResNet^[9]	基准方法	9.0518	0.2499	3.2901	0.8577	9.0893	0.2602	3.3896	0.8901	${\bf{ 5.06}}$
ResNet^[9]	OMLA + 元预训练	${\bf{ 3.4051}}$	${\bf{ 0.0864}}$	${{\bf{{0.6256}}}}$	${\bf{ 0.1852}}$	${\bf{ 4.0573}}$	${\bf{ 0.1231}}$	${\bf{ 1.1532}}$	${\bf{ 0.1985}}$	3.40
MADNet^[15]	基准方法	8.8650	0.2684	3.1503	0.8233	8.9823	0.2790	3.3021	0.8350	${\bf{ 12.05}}$
MADNet^[15]	OMLA + 元预训练	${\bf{ 4.0236}}$	${\bf{ 0.1756}}$	${\bf{ 1.1825}}$	${\bf{ 0.2501}}$	${\bf{ 4.2179}}$	${\bf{ 0.1883}}$	${\bf{ 1.2761}}$	${\bf{ 0.2523}}$	9.56
DispNet^[41]	基准方法	9.0222	0.2710	4.3281	0.9452	9.1587	0.2805	4.3590	0.9528	${\bf{ 5.42}}$
DispNet^[41]	OMLA + 元预训练	${\bf{ 4.5201}}$	${\bf{ 0.2396}}$	${\bf{ 1.3104}}$	${\bf{ 0.2503}}$	${\bf{ 4.6314}}$	${\bf{ 0.2457}}$	${\bf{ 1.3541}}$	${\bf{ 0.2516}}$	4.00

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表 3 与理想模型和当前最优方法的比较 (仅比较实际深度值小于50 m的像素点)

Table 3 Comparison with ideal models and state-of-the-art method (Results are only evaluated within 50 m)

网络模型	在线适应算法	预训练域	RMSE	Abs Rel	Sq Rel	${\rm{RMSE}}_{{\rm{log}}}$	$\alpha>1.25$	$\alpha>1.25^2$	$\alpha>1.25^3$
ResNet^[9]	无	目标域	3.6975	0.0983	1.1720	0.1923	0.9166	0.9580	0.9778
	基准方法	目标域	3.4359	${\bf{ 0.0850}}$	0.6547	0.1856	${{\bf{{0.9203}}}}$	0.9612	0.9886
	L2A^[35]	源域	3.5030	0.0913	0.6522	${\bf{ 0.1840}}$	0.9170	0.9611	0.9882
	OMLA+元预训练	源域	${\bf{ 3.4051}}$	0.0864	${\bf{ 0.6256 }}$	0.1852	0.9170	${\bf{ 0.9623}}$	${\bf{ 0.9901}}$
MADNet^[15]	无	目标域	${{\bf{{3.8965}}}}$	0.1793	1.2369	${{\bf{{0.2457}}}}$	0.9147	0.9601	0.9790
	基准方法	目标域	3.9023	0.1760	1.1902	0.2469	${\bf{ 0.9233}}$	0.9652	0.9813
	L2A^[35]	源域	4.1506	0.1788	1.1935	0.2533	0.9131	0.9443	0.9786
	OMLA+元预训练	源域	4.0236	${{\bf{{0.1756}}}}$	${{\bf{{1.1825}}}}$	0.2501	0.9022	${\bf{ 0.9658}}$	${\bf{ 0.9842}}$
DispNet^[41]	无	目标域	4.5210	0.2433	${{\bf{{1.2801}}}}$	${{\bf{{0.2490}}}}$	0.9126	0.9472	${{\bf{{0.9730}}}}$
	基准方法	目标域	4.5327	${\bf{ 0.2368}}$	1.2853	0.2506	${\bf{ 0.9178}}$	${\bf{ 0.9600}}$	0.9725
	L2A^[35]	源域	4.6217	0.2410	1.2902	0.2593	0.9062	0.9513	0.9688
	OMLA+元预训练	源域	${{\bf{{4.5201}}}}$	0.2396	1.3104	0.2503	0.9085	0.9460	0.9613

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