A digital solution to track ping pong (table tennis) practice statistics concurrently. The following tools and frameworks are used: * Python with OpenCV library * Python with Flask framework * Flask framework with SocketIO library * Bootstrap and jQuery for web content * Spydroid for RTSP streaming from mobile phone

1. Daniel Kao
Ping Pong Pad

2. Agenda
● Problem
○ No visible statistics when practicing; no motivation
● Goal
○ Provide a dashboard during and after practicing
● Architecture
● Details
○ RTSP Streaming
○ Image Processing
○ Web Server
○ Statistics

3. Problem
● Practice without knowing
time, performance, trend.
● Nothing is of help for next
practice.

4. Goal
● Need something visual.
● Make it more gamification.
● People loves numbers.

5. Architecture
1. Mobile phone to record videos
and stream to PC
2. PC runs scripts to process
streaming images, extract
information, and feed them into
web server
3. Tablet accesses web server to
show current statistics

6. RTSP server
Spydroid App
https://github.com/fyhertz/spydroid-ipcamera

7. Image Processing
● OpenCV library in Python
● Steps
○ Fetch each frame in streaming video
○ Convert them into gray (because color is irrelevant)
○ Take first frame as comparison reference
○ Compare diffs for following frames
■ If difference is larger than a threshold, we believe the ball is entered screen,
● Count as one hit
● If it’s within a time threshold, count it as consecutive hit

8. Demo Video for Image Processing
Real Image
Diff Image with
Gaussian Blur
Use Threshold
to process the
diff area
Find contour area

9. Web Server
● Python (again)
● Flask (simple web server framework)
● SocketIO

10. Web Page Demo
● Total balls
● Total hits
● Current consecutive hits
● Max consecutive hits
● Practice duration

11. Web Page Demo (II)
● Practice Trend
● Daily statistics

12. Future Plans
● More analysis on data
○ Practice stability: average consecutive hits
○ Strength measurement: average hit count per minute
○ Etc
● More interactive ways
○ Recognize which area of the training board is hit
○ Show random area in web content, and see if I can hit that area
continuously
○ Identify two training boards (one at right side, and another on left
side of the table)
4 5
1 2 3
6

13. References
● Github
○ https://github.com/plateaukao/pingpongpad
● Medium article
○ https://danielkao.medium.com/table-tennis-practice-tracking-dashboard-3c2535037f2b