MMM’20: Evaluating the Generalization Performance of Instrument Classification in Cataract Surgery Videos

Our paper has been accepted for publication at the MMM 2020 Conference on Multimedia Modeling.

Authors: Natalia Sokolova, Klaus Schoeffmann, Mario Taschwer, Doris
Putzgruber-Adamitsch, Yosuf El-Shabrawi

In the field of ophthalmic surgery, many clinicians nowadays record their microscopic procedures with a video camera and use the recorded footage for later purpose, such as forensics, teaching, or training. However, in order to efficiently use the video material after surgery, the video content needs to be analyzed automatically. Important semantic content to be analyzed and indexed in these short videos are operation instruments, since they provide an indication of the corresponding operation phase and surgical action. Related work has already shown that it is possible to accurately detect instruments in cataract surgery videos. However, their underlying dataset (from the CATARACTS challenge) has very good visual quality, which is not reflecting the typical quality of videos acquired in general hospitals. In this paper, we therefore analyze the generalization performance of deep learning models for instrument recognition in terms of dataset change. More precisely, we trained such models as ResNet-50, Inception v3 and NASNet Mobile using a dataset of high visual quality (CATARACT) and test it on another dataset with low visual quality (Cataract-101), and vice versa. Our results show that the generalizability is rather low in general, but clearly worse for the model trained on the high-quality dataset. Another important observation is the fact that the trained models are able to detect similar instruments in the other dataset even if their appearance is different.

Second PhD student joined the project

In February 2019,  a second PhD student (Negin Ghamsarian) joined the OVID project. She will work on surgical workflow analysis and video preprocessing.

Since a third PhD student withdrew her application in a late stage of the hiring process, we decided to conduct the project with only two PhD students for now.

OVID project started on October 1, 2018

The OVID project officially started on October 1, 2018. The research project is supported by the Austrian Science Fund FWF and is scheduled to run for three years.

The FWF grant supports employment of three PhD students (for 3 years each) and one student assistant (for 15 months). Currently, one PhD student (Natalia Sokolova) and the student assistant (Markus Fox) have taken up their work. The other two PhD students will follow within the next few months.