Lythium

Visual Quality Inspection using Deep Learning

How Lightly enabled scaling Lythium’s video inspection systems to new levels

Lythium Cockpit

About

Lythium is a Chilean company that focuses on building deep learning applications for video analytics. One of their flagship products is automated quality inspection through computer vision in assembly lines and providing analytics. For this particular use case, instead of having humans check the quality of salmon filets, Lythium’s software analyzes the video feed in the factory in real-time and classifies the salmon filets into different quality categories.

To improve its existing system, Lythium relies on a manual data curation and selection process before sending the data for labeling. After labeling, they retrain the models to see how they improved and iterate until the target accuracy is reached. Even though these manual processes are prone to human errors, it was a sufficient solution so far.

Visual inspection using Lythium's algorithms

Problem

However, things have changed, as Lythium now collects more than 15’000 new images per day and they were facing the following issues:

  • Scalability: Manual processes do not provide enough room to scale.
  • Automation: To enhance the ML data pipeline, Lythium is dependent on automating processes.
  • Selection: At the same time, selecting the right data to improve the existing system is crucial for model performance.

To tackle these problems and to improve the data quality Lythium started using Lightly’s data curation platform. As an experiment, Lythium tested Lightly’s data selection against random selection.

Scalable and Efficient Data Curation using Lightly

Using Lightly’s self-supervised learning (SSL)feature, Lythium selected the thousand most diverse images from a dataset of20k images. After the first iteration, the active learning on an object level, based on the predictions, helped them select another batch of thousand images that were fine-tuned with the SSL feature. On top of that, Lythium applied the advanced selection feature to rebalance the dataset based on several factors.

Results

Lightly’s selection outperformed random selection significantly. In general, a 36% higher accuracy was achieved, while recall improved by 32%. Looking at the f1 score, below Lightly outperformed random significantly in almost every class enhancing it by 10%.

Results of Lythiums experiment: Lightly versus random selection

These improvements allowed Lythium to pass on the following benefits to their customers:

  • Delivering higher accuracy in defect detection
  • Scaling to several hundred hours of processed inspection video material
  • Reducing manual inspection time from experts by 75%

Thanks to Lightly, Lythium could reduce the time spent on data curation by 50%. Lightly’s active learning pipeline helped them improve the model accuracy significantly after only a few iterations (!). Furthermore, it provided them with an insightful overview highlighting areas of missing data samples. Most importantly, the Lightly platform allows them to automate and scale their processes efficiently while gaining transparency over the impact of data selection on model performance.

Client review

“Lightly gave us transparency to a part of the ML development that is a black box, data. Furthermore, Lightly enabled us to do Active Learning at scale and helped us improve recall and F1-score of our object detector by 32% and 10% compared to our previous data selection method. We finally saw the light in our data using Lightly.”

Gonzalo Urquieta

Project Leader

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