AI-assisted Bio-logging

We have developed AI-enabled bio-loggers to improve runtime and precision.

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How can we enhance biological research with AI and IoT technologies? I am an information scientist specializing in mobile and ubiquitous computing. In our project “Systems Science of Bio-Navigation,” which is supported by the Japan Society for the Promotion of Science, we have studied the “algorithms” of animal navigation in collaboration with researchers from the engineering, information science, ecology, and neuroscience research domains.

The research groups of information scientists have helped in achieving the goal of the research by providing: i) assisting technologies for collection of animal behavior data through machine learning, and ii) supporting computational technologies for animal behavioral analysis.

The bio-logger equipped with a camera developed by us (left; latest version) and animal behavior observation with bio-loggers (right)

In our study related to data collection, we focused on bio-loggers (animal-borne data loggers) and developed AI-enabled bio-loggers. Bio-logging enables us to observe several aspects of animal life. However, because the mass of a bio-logger is restricted, the bio-logger has short runtimes when collecting data from resource-intensive sensors such as cameras.

To address this problem, we proposed the concept of AI-assisted bio-loggers, which we will refer to as AI on Animals (AIoA). These bio-loggers can use low-cost sensors, such as accelerometers and GPS, to automatically detect behaviors of interest in real-time, allowing them to conditionally activate high-cost sensors, such as cameras, to target those behaviors.

An activity (behavior) detection process is run on the processor of the bio-logger in real-time. In general, we debug the software on a computer (PC) while running it. However, it is difficult to do this in our case because the computer is on a bird! To debug the software and fine-tune the parameters, we also attended fieldwork on animals (seabirds) conducted by our research collaborators.

Climbing down cliffs at Niigata, Japan (left) and Peninsula Valdes, Argentina (right) to arrive at colonies of seabirds

Typically, information scientists prefer to stay at home or in laboratories. In addition, in many cases, our research activities in the laboratories are completely safe. I never expected to climb a dangerous cliff in Argentina in my research activities when I started my carrier as an information scientist! However, after frequent visits to the fields, I became more interested in biological studies and in the potential of AI and IoT technologies for understanding animal ecology. 

Peninsula Valdes, Argentina (left) and Kabushima, Aomori, Japan (right)

Here is an example video recorded by our bio-logger:

We have also published our YouTube channel that introduces videos recorded by our loggers. Please check and register it. For more details about our loggers, please refer to our paper.

For supporting technologies of animal behavioral analysis, we developed a deep learning method for the comparative analysis of animal trajectories. The method, called DeepHL, assumes a comparative analysis of two animal groups (e.g., male and female seabirds) and automatically highlights trajectory segments that are characteristic of one group, enabling biologists to focus on important segments of various trajectories.

Screenshot of the DeepHL web interface comparing the trajectories of a female (left) and male (right) streaked shearwater. Characteristic segments of the trajectories are highlighted in red. This example indicates that female birds prefer areas close to the coastline.

This study has also recently been published in Nature Communications (link):

Takuya Maekawa, Kazuya Ohara, Yizhe Zhang, Matasaburo Fukutomi, Sakiko Matsumoto, Kentarou Matsumura, Hisashi Shidara, Shuhei J. Yamazaki, Ryusuke Fujisawa, Kaoru Ide, Naohisa Nagaya, Koji Yamazaki, Shinsuke Koike, Takahisa Miyatake, Koutarou D. Kimura, Hiroto Ogawa, Susumu Takahashi, and Ken Yoda: Deep Learning-assisted Comparative Analysis of Animal Trajectories with DeepHL, Nature Communications 11 (5316), Oct. 2020.

Takuya Maekawa

Associate Professor, Osaka University

Takuya Maekawa is an Associate Professor in the Graduate School of Information Science and Technology, Osaka University. In 2006, he received his doctor degree (Information Science and Technology) from Graduate School of Information Science and Technology, Osaka University. After that he worked for NTT Communication Science Laboratory for six years. His research interest includes sensor-based context recognition techniques for pervasive/ubiquitous computing.

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