尊敬的 微信汇率:1円 ≈ 0.046078 元 支付宝汇率:1円 ≈ 0.046168元 [退出登录]
SlideShare a Scribd company logo
Object Detection in the Wild
Borys Tymchenko
VITech
(an embarrassingly simple approach)
What do we need to solve?
- Detect objects
- Detect their attributes
- Track them in time
What do we need to solve in particular?
- Detect people
- Detect their clothes
- Helmet
- Vest
- Glasses
- Headphones
- Track them in time
- Challenging environment
Environment challenges us to be creative!
- People can occlude each other
- People can carry things
- People can be occluded by environment
- Tracks must be consistent
- Clothes must be detected per person
Detecting clothes: three approaches
- Top down approach:
- Detect person
- Within it detect clothes
- Play around matching
- Bottom-up approach
- Detect clothes
- Try to stitch them into person
- Single pass
- Detect person in the frame
- Detect clothes in the frame
- Match them together
Top-down and bottom-up downsides
- Sensitive to occlusions
- Unattended clothes items can lead to false positives
- Overlapping people lead to false reconstructions
- Temporal inconsistency
Doing everything in a single pass: the method
Combine CenteNet and FCOS to detect simultaneously:
- object classes
- bounding boxes
- attributes
- tracking features
Overall approach
- Predict everything for every pixel, sort out in post-processing
Training
- Focal Loss on objectness head
- Training target is gaussian with the value 1 in the center and 0 on the edge of the box
- L1 loss on bbox coordinates head
- Training target: for every pixel inside bbox there are 4 coordinates (lop, left, right, bottom)
- Focal Loss on classes head
- Training target is gaussian with the value 1 in the center and 0 on the edge of the box
- Focal Loss on attributes head
- Training target is gaussian with the value 1 in the center and 0 on the edge of the box
- Cross-Entropy on features head
- Training target: class for every object in the dataset
Inference
- Select top-k peaks on the objectness heatmap
- From their coordinates get values from other heatmaps
- Apply scaling/sigmoid if needed
Tracking?
DeepSORT with provided features
Problem detected: heatmaps are not aligned
Solution:
Multiply inputs to all heads by objectness during training (cue: CenterNetv2)
What about data?
What about data? And how to validate this?
- Pretrain on synthetic dataset (in-house)
- Collect data from different locations, label everything)
- Train jointly, validate separately
- Ensure to leave some locations to validate if it generalizes well
If your project is non-commercial, use CrowdHuman, COCO, etc. to pretrain
Results
Results
Useful papers
- CenterNet: arxiv.org/abs/1904.07850
- FCOS: arxiv.org/abs/1904.01355
- CenterNet v2: arxiv.org/abs/2103.07461
- TTFNet: arxiv.org/abs/1909.00700
- YOLOv5: github.com/ultralytics/yolov5
Thanks for watching!
Feel free to say “WT# was this?”!
18
ods.ai: spsancti
t.me/spsancti
fb.com/borys.tymc

More Related Content

Recently uploaded

Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls HyderabadHyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
binna singh$A17
 
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cashRoyal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
Ak47
 
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
mparmparousiskostas
 
Classifying Shooting Incident Fatality in New York project presentation
Classifying Shooting Incident Fatality in New York project presentationClassifying Shooting Incident Fatality in New York project presentation
Classifying Shooting Incident Fatality in New York project presentation
Boston Institute of Analytics
 
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
#kalyanmatkaresult #dpboss #kalyanmatka #satta #matka #sattamatka
 
A review of I_O behavior on Oracle database in ASM
A review of I_O behavior on Oracle database in ASMA review of I_O behavior on Oracle database in ASM
A review of I_O behavior on Oracle database in ASM
Alireza Kamrani
 
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts ServicePune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
vashimk775
 
Call Girls Hyderabad (india) ☎️ +91-7426014248 Hyderabad Call Girl
Call Girls Hyderabad  (india) ☎️ +91-7426014248 Hyderabad  Call GirlCall Girls Hyderabad  (india) ☎️ +91-7426014248 Hyderabad  Call Girl
Call Girls Hyderabad (india) ☎️ +91-7426014248 Hyderabad Call Girl
sapna sharmap11
 
MySQL Notes For Professionals sttudy.pdf
MySQL Notes For Professionals sttudy.pdfMySQL Notes For Professionals sttudy.pdf
MySQL Notes For Professionals sttudy.pdf
Ananta Patil
 
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
Douglas Day
 
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
nitachopra
 
CAP Excel Formulas & Functions July - Copy (4).pdf
CAP Excel Formulas & Functions July - Copy (4).pdfCAP Excel Formulas & Functions July - Copy (4).pdf
CAP Excel Formulas & Functions July - Copy (4).pdf
frp60658
 
machine learning notes by Andrew Ng and Tengyu Ma
machine learning notes by Andrew Ng and Tengyu Mamachine learning notes by Andrew Ng and Tengyu Ma
machine learning notes by Andrew Ng and Tengyu Ma
Vijayabaskar Uthirapathy
 
Salesforce AI + Data Community Tour Slides - Canarias
Salesforce AI + Data Community Tour Slides - CanariasSalesforce AI + Data Community Tour Slides - Canarias
Salesforce AI + Data Community Tour Slides - Canarias
davidpietrzykowski1
 
IBM watsonx.data - Seller Enablement Deck.PPTX
IBM watsonx.data - Seller Enablement Deck.PPTXIBM watsonx.data - Seller Enablement Deck.PPTX
IBM watsonx.data - Seller Enablement Deck.PPTX
EbtsamRashed
 
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance PaymentCall Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
prijesh mathew
 
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
mona lisa $A12
 
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
nainasharmans346
 
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
ThinkInnovation
 
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
wwefun9823#S0007
 

Recently uploaded (20)

Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls HyderabadHyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
Hyderabad Call Girls Service 🔥 9352988975 🔥 High Profile Call Girls Hyderabad
 
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cashRoyal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
Royal-Class Call Girls Thane🌹9967824496🌹369+ call girls @₹6K-18K/full night cash
 
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
Optimizing Feldera: Integrating Advanced UDFs and Enhanced SQL Functionality ...
 
Classifying Shooting Incident Fatality in New York project presentation
Classifying Shooting Incident Fatality in New York project presentationClassifying Shooting Incident Fatality in New York project presentation
Classifying Shooting Incident Fatality in New York project presentation
 
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
satta matka Dpboss guessing Kalyan matka Today Kalyan Panel Chart Kalyan Jodi...
 
A review of I_O behavior on Oracle database in ASM
A review of I_O behavior on Oracle database in ASMA review of I_O behavior on Oracle database in ASM
A review of I_O behavior on Oracle database in ASM
 
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts ServicePune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
Pune Call Girls <BOOK> 😍 Call Girl Pune Escorts Service
 
Call Girls Hyderabad (india) ☎️ +91-7426014248 Hyderabad Call Girl
Call Girls Hyderabad  (india) ☎️ +91-7426014248 Hyderabad  Call GirlCall Girls Hyderabad  (india) ☎️ +91-7426014248 Hyderabad  Call Girl
Call Girls Hyderabad (india) ☎️ +91-7426014248 Hyderabad Call Girl
 
MySQL Notes For Professionals sttudy.pdf
MySQL Notes For Professionals sttudy.pdfMySQL Notes For Professionals sttudy.pdf
MySQL Notes For Professionals sttudy.pdf
 
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
202406 - Cape Town Snowflake User Group - LLM & RAG.pdf
 
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
Call Girls Goa👉9024918724👉Low Rate Escorts in Goa 💃 Available 24/7
 
CAP Excel Formulas & Functions July - Copy (4).pdf
CAP Excel Formulas & Functions July - Copy (4).pdfCAP Excel Formulas & Functions July - Copy (4).pdf
CAP Excel Formulas & Functions July - Copy (4).pdf
 
machine learning notes by Andrew Ng and Tengyu Ma
machine learning notes by Andrew Ng and Tengyu Mamachine learning notes by Andrew Ng and Tengyu Ma
machine learning notes by Andrew Ng and Tengyu Ma
 
Salesforce AI + Data Community Tour Slides - Canarias
Salesforce AI + Data Community Tour Slides - CanariasSalesforce AI + Data Community Tour Slides - Canarias
Salesforce AI + Data Community Tour Slides - Canarias
 
IBM watsonx.data - Seller Enablement Deck.PPTX
IBM watsonx.data - Seller Enablement Deck.PPTXIBM watsonx.data - Seller Enablement Deck.PPTX
IBM watsonx.data - Seller Enablement Deck.PPTX
 
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance PaymentCall Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
Call Girls Hyderabad ❤️ 7339748667 ❤️ With No Advance Payment
 
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
Delhi Call Girls Karol Bagh 👉 9711199012 👈 unlimited short high profile full ...
 
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
Hot Call Girls In Bangalore 🔥 9352988975 🔥 Real Fun With Sexual Girl Availabl...
 
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
Difference in Differences - Does Strict Speed Limit Restrictions Reduce Road ...
 
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
Call Girls In Tirunelveli 👯‍♀️ 7339748667 🔥 Safe Housewife Call Girl Service ...
 

Featured

2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot
Marius Sescu
 
Everything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPTEverything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPT
Expeed Software
 
Product Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage EngineeringsProduct Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage Engineerings
Pixeldarts
 
How Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental HealthHow Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental Health
ThinkNow
 
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdfAI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
marketingartwork
 
Skeleton Culture Code
Skeleton Culture CodeSkeleton Culture Code
Skeleton Culture Code
Skeleton Technologies
 
PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024
Neil Kimberley
 
Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)
contently
 
How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
Albert Qian
 
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie InsightsSocial Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
Kurio // The Social Media Age(ncy)
 
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
Search Engine Journal
 
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
SpeakerHub
 
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
Clark Boyd
 
Getting into the tech field. what next
Getting into the tech field. what next Getting into the tech field. what next
Getting into the tech field. what next
Tessa Mero
 
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search IntentGoogle's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Lily Ray
 
How to have difficult conversations
How to have difficult conversations How to have difficult conversations
How to have difficult conversations
Rajiv Jayarajah, MAppComm, ACC
 
Introduction to Data Science
Introduction to Data ScienceIntroduction to Data Science
Introduction to Data Science
Christy Abraham Joy
 
Time Management & Productivity - Best Practices
Time Management & Productivity -  Best PracticesTime Management & Productivity -  Best Practices
Time Management & Productivity - Best Practices
Vit Horky
 
The six step guide to practical project management
The six step guide to practical project managementThe six step guide to practical project management
The six step guide to practical project management
MindGenius
 
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
RachelPearson36
 

Featured (20)

2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot
 
Everything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPTEverything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPT
 
Product Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage EngineeringsProduct Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage Engineerings
 
How Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental HealthHow Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental Health
 
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdfAI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
 
Skeleton Culture Code
Skeleton Culture CodeSkeleton Culture Code
Skeleton Culture Code
 
PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024
 
Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)
 
How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
 
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie InsightsSocial Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
 
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
 
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
 
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
 
Getting into the tech field. what next
Getting into the tech field. what next Getting into the tech field. what next
Getting into the tech field. what next
 
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search IntentGoogle's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
 
How to have difficult conversations
How to have difficult conversations How to have difficult conversations
How to have difficult conversations
 
Introduction to Data Science
Introduction to Data ScienceIntroduction to Data Science
Introduction to Data Science
 
Time Management & Productivity - Best Practices
Time Management & Productivity -  Best PracticesTime Management & Productivity -  Best Practices
Time Management & Productivity - Best Practices
 
The six step guide to practical project management
The six step guide to practical project managementThe six step guide to practical project management
The six step guide to practical project management
 
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
 

ODS.ai Odessa Meetup #3: Object Detection in the Wild

  • 1. Object Detection in the Wild Borys Tymchenko VITech (an embarrassingly simple approach)
  • 2. What do we need to solve? - Detect objects - Detect their attributes - Track them in time
  • 3. What do we need to solve in particular? - Detect people - Detect their clothes - Helmet - Vest - Glasses - Headphones - Track them in time - Challenging environment
  • 4. Environment challenges us to be creative! - People can occlude each other - People can carry things - People can be occluded by environment - Tracks must be consistent - Clothes must be detected per person
  • 5. Detecting clothes: three approaches - Top down approach: - Detect person - Within it detect clothes - Play around matching - Bottom-up approach - Detect clothes - Try to stitch them into person - Single pass - Detect person in the frame - Detect clothes in the frame - Match them together
  • 6. Top-down and bottom-up downsides - Sensitive to occlusions - Unattended clothes items can lead to false positives - Overlapping people lead to false reconstructions - Temporal inconsistency
  • 7.
  • 8. Doing everything in a single pass: the method Combine CenteNet and FCOS to detect simultaneously: - object classes - bounding boxes - attributes - tracking features
  • 9. Overall approach - Predict everything for every pixel, sort out in post-processing
  • 10. Training - Focal Loss on objectness head - Training target is gaussian with the value 1 in the center and 0 on the edge of the box - L1 loss on bbox coordinates head - Training target: for every pixel inside bbox there are 4 coordinates (lop, left, right, bottom) - Focal Loss on classes head - Training target is gaussian with the value 1 in the center and 0 on the edge of the box - Focal Loss on attributes head - Training target is gaussian with the value 1 in the center and 0 on the edge of the box - Cross-Entropy on features head - Training target: class for every object in the dataset
  • 11. Inference - Select top-k peaks on the objectness heatmap - From their coordinates get values from other heatmaps - Apply scaling/sigmoid if needed Tracking? DeepSORT with provided features
  • 12. Problem detected: heatmaps are not aligned Solution: Multiply inputs to all heads by objectness during training (cue: CenterNetv2)
  • 14. What about data? And how to validate this? - Pretrain on synthetic dataset (in-house) - Collect data from different locations, label everything) - Train jointly, validate separately - Ensure to leave some locations to validate if it generalizes well If your project is non-commercial, use CrowdHuman, COCO, etc. to pretrain
  • 17. Useful papers - CenterNet: arxiv.org/abs/1904.07850 - FCOS: arxiv.org/abs/1904.01355 - CenterNet v2: arxiv.org/abs/2103.07461 - TTFNet: arxiv.org/abs/1909.00700 - YOLOv5: github.com/ultralytics/yolov5
  • 18. Thanks for watching! Feel free to say “WT# was this?”! 18 ods.ai: spsancti t.me/spsancti fb.com/borys.tymc
  翻译: