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Automated Langmuir Deposition Detection

Overview

This project aims to create an easy to use interface for monitoring and controlling the injection process of ink onto a liquid surface and to turn off the injection once the saturation point is reached. The idea is to observe relative HSV time series data (hue, saturation, brightness/value) to find the point of saturation. The reference frame should be captured before the injection starts.

The interface consists of a webserver that currently performs the following tasks:

  • capture a real-time webcam or Raspberry Pi camera feed
  • perform edge detection and ellipsoid fitting to find the region of interest: in our case this is a cylindrical container
  • capture a reference frame and calculate the relative HSV data for each subsequently captured frame
  • plot the HSV history in a user defined range

This is a work in progress. There will be bugs. Some things will not work as intended. Feel free to poke around in the code and submit a PR if you want to help fix things.

Installation on a desktop computer/laptop

  1. Clone this project with git clone https://github.com/smlpt/deposition-detection
  2. Create a virtual Python environment somewhere on your file system, activate it and install the project dependencies from requirements.txt with pip install -r requirements.txt
  3. Ensure that a webcam is connected to your computer
  4. cd into the project src and run python main.py
  5. Open http://localhost:7860/ in a browser to access the interface

Installation on a Raspberry Pi

This part needs more testing and might not work yet

  1. Clone this project with git clone https://github.com/smlpt/deposition-detection
  2. Create a virtual Python environment somewhere on your file system, activate it and install the project dependencies from requirements.txt with pip install -r requirements.txt
  3. Ensure that either a webcam or the Raspberry Pi camera is connected to your Raspberry Pi
  4. cd into the project and run python main.py
  5. Open http://<raspberry-pi-ip>:7860 in a browser to access the interface. To find the IP address of the Raspberry Pi, you either have to go looking in your Router, or you connect a display and a keyboard and find the IP via ifconfig.