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Deep learning for person re-identification
Jingya Wang
jingya.wang@usyd.edu.au
2
Person re-identification (re-id)
Person re-identification (re-id) aims at matching people
across non-overlapping camera views distributed at distinct
locations.
Camera A Camera B
Presentation Outline
• Supervised Person Re-Identification
• Unsupervised Person Re-Identification
• Active Learning for Person Re-Identification
Supervised Person Re-Identification
• Training and testing data are from same domain
Lavi, B., Serj, M.F. and Ullah, I., 2018. Survey on deep learning techniques for person re-identification task
Contrastive loss Triplet lossClassification loss
https://paperswithcode.com/sota/person-re-identification-on-market-1501
Deep learning for person re-identification
Deep learning for person re-identification
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AnnotationCost
Data Size
Challenge For Re-ID
rapid increase
Presentation Outline
• Supervised Person Re-Identification
• Unsupervised Person Re-Identification
• Active Learning for Person Re-Identification
Unsupervised Person Re-Identification
Training and testing data are from different domain
-> learned on the source domain and transfer the knowledge to
target domain (unsupervised domain adaptation)
Train: Market1501 Test: DUKE
Challenges:
• Source and target domains have unknown camera viewing conditions
• The identity/class between source and target domains are non-overlapping
therefore presents a more challenging open-set recognition problem
-> Transferring knowledge of the source domain to target domain in
attribute space
Wang J, Zhu X, Gong S, Li W. Transferable joint attribute-identity deep learning
for unsupervised person re-identification. CVPR,2018
Unsupervised Person Re-Identification
Wang J, Zhu X, Gong S, Li W. Transferable joint attribute-identity deep learning
for unsupervised person re-identification. CVPR,2018
Unsupervised Person Re-Identification
Unsupervised Target Domain Adaptation
Wang J, Zhu X, Gong S, Li W. Transferable joint attribute-identity deep learning
for unsupervised person re-identification. CVPR,2018
Unsupervised Person Re-Identification
Unsupervised Person Re-Identification
Image-to-image translation method: SPGAN
Deng et al., Image-image domain adaptation with preserved self-similarity
and domain-dissimilarity for person re-identification. CVPR 2018
preserved self-similarity and domain dissimilarity
Unsupervised Person Re-Identification
Image-to-image translation method: CamStyle GAN
Zhong, Zhun, et al. "Camera style adaptation for person re-identification." CVPR. 2018.
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AnnotationCost
Data Size
Challenge For Re-ID
rapid increase
Presentation Outline
• Supervised Person Re-Identification
• Unsupervised Person Re-Identification
• Active Learning for Person Re-Identification
Make AI work in the real world: Human-In-The-Loop
Human-in-the-Loop (HITL) explores human feedback
in an incremental learning cycle of the machine for
rapid model domain adaptation
Active learning is a special case of machine learning in which a learning algorithm
is able to interactively query the user (or some other information source) to obtain
the desired outputs at new data points.
There are three scenarios for Active learning :
1. Membership Query Synthesis: the learner generates/constructs an
instance (from some underlying natural distribution).
2. Stream-Based selective sampling, i.e, each sample is considered separately
in our case for label-querying or rejection. Similarly to online-learning, the
data is not saved, there are no assumptions on data distribution, and
therefore it is adaptive to change.
3. Pool-Based sampling, i.e., sampled are chosen from a pool of
unlabeled data for the purpose of labeling
Training
Pool
Agent
request
label
model
query
Training
Pool
selection
strategy
request
label
model
Active Learning Person Re-Identification
Liu, Z.*, Wang, J *., Gong, S., Lu, H. and Tao, D. Deep Reinforcement
Active Learning for Human-in-the-Loop Person Re-Identification. ICCV,
2019,Oral
Concept
A user annotates few informative pedestrian pairs recommended
by an adaptive agent in a human-in-the-loop learning
mechanism
Re-ID
Model
Sample Selection
(agent)
annotator
Pairwise Data
human-in-the-loop
Agent
action!"
query
ancho
r
query for label
unlabeled gallery
pool
state
reward
Goal: Sample Informative Pair
Action: Select One Sample at Each Step
State: Reflect Sample Correlation
Reward: Uncertainty
Liu, Z.*, Wang, J *., Gong, S., Lu, H. and Tao, D. Deep Reinforcement
Active Learning for Human-in-the-Loop Person Re-Identification. ICCV,
2019,Oral
STATE
annotator
Re-ID Loss(Triplet)
REWARD
ACTION
Sample Selection Strategy
gallery pool
query
q
…
g
1
g
2
g
N
0 0.83 0.71 0.66 0.47 0.36
0.83 0 0.85 0 0.87 0
0.71 0.85 0 0 0 0
0.66 0 0 0 0 0
0.47 0.87 0 0 0 0.77
0.36 0 0 0 0.77 0
gKq
Methodology
Joint Reinforcement Active Learning in A Deep Network
false
CNN
!
Agent
"
Liu, Z.*, Wang, J *., Gong, S., Lu, H. and Tao, D. Deep Reinforcement
Active Learning for Human-in-the-Loop Person Re-Identification. ICCV,
2019,Oral
Action: Select One Sample at Each Step
State: We construct a sparse similarity graph among query and gallery samples and take
it as the state value (Reflect Sample Correlation)
1. Base CNN Network
2. A Deep Reinforced Active Learner - An Agent
Methodology
An example of state updating with different human feedback
Reward: we perform a similar hard triplet loss to measure the uncertainty of data.
Dataset & Result (Market-1501)
Supervised Transfer unsupervised
87.95
84.2
42.79
Ours
0.15%
annotated
100%
annotated
0% annotated
73.25
66.26
20.04
R-1 mAP
Deep learning for person re-identification
Presentation Outline
Link Person Re-Identification with ….
• Attribute Learning
• Detection (Person Search )
• Tracking (Multi-target multi-camera tracking)
Attribute recognition usually denotes local structures of a person
Person Re-Identification and Attribute Learning
Ø How do human brain match person?
Long hair
bag
31
Attribute recognition usually denotes local structures of a person
Person Re-Iden3fica3on and A6ribute Learning
Ø How do human brain match person?
Long hair
bag
Attribute Recognition in in Surveillance
ØChallenges:
• Poor image quality
• Complex background clutter
• Uncontrolled viewing conditions
• Small number of labelled training
ØMain idea:
•Discover the interdependency and correlation among
attributes
•Explore visual context as an extra information source to
assist attribute recognition
ØContributions:
•A novel end-to-end encoder-decoder architecture capable
of jointly learning image level context and attribute level
sequential correlation
•Exploit more latent and richer higher-order dependency
among attributes
Wang, J, et al. "Attribute recognition by joint recurrent learning of
context and correlation." ICCV. 2017
Attribute Recognition in in Surveillance
Person Re-Identification and Attribute Recognition
Lin, Yutian, et al. "Improving person re-identification by attribute and
identity learning." Pattern Recognition (2019).
Attribute-based Person Re-Identification
35
•Teenager
•Backpack
•Pants
•Short bottom wear
•Short top wear
•Long hair
•Female
•Top white
•Bottom blue
Ranked
retrieval
results
Query attribute descriptions
Gallery images
Yin, Zhou, et al. "Adversarial attribute-image person re-identification." IJCAI, 2018.
Attribute-based Person Re-Identification
Presentation Outline
Link Person Re-Identification with ….
• Attribute Learning
• Detection (Person Search )
• Tracking (Multi-target multi-camera tracking)
Person Re-Identification and Detection
Zheng, L., Yang, Y., & Hauptmann, A. G. (2016). Person re-identification: Past, present and future.
Person Re-Identification Datasets
Detection
Xiao, Tong, et al. "Joint detection and identification feature learning for
person search." CVPR. 2017
Person Re-Identification and Detection
Liu, Hao, et al. "Neural person search machines." ICCV. 2017.
Person Re-Identification and Detection
Presentation Outline
Link Person Re-Identification with ….
• Attribute Learning
• Detection (Person Search )
• Tracking (Multi-target multi-camera tracking)
Multi-target multi-camera tracking
1st MTMCT and ReID workshop CVPR 2017
2nd MTMCT and ReID workshop CVPR 2019
Duke MTMC (Multi-Target, Multi-Camera) dataset
Multi-target multi-camera tracking
Ristani, Ergys, and Carlo Tomasi. "Features for multi-target multi-
camera tracking and re-identification." CVPR. 2018.
Conclusion
• Supervised Person Re-Identification
• Unsupervised Person Re-Identification
• Active Learning for Person Re-Identification
Link Person Re-Identification with ….
Ø Attribute Learning
Ø Detection (Person Search )
Ø Tracking (Multi-target multi-camera tracking)
Thank you

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