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Sun Lab
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A lab that studies non-contact biometric measurement of heart rate and respiration without touching the body.
AboutAbout the lab
Measuring vital signs without touching the body
The Sun Lab researches technology for measuring vital signs such as heart rate, respiration, body temperature, and blood pressure without touching the person's body.
Using sensors such as radar, thermography, and cameras, the lab works on methods for processing the resulting signals and images, and on practical application research for medical systems that incorporate them.
Target areas include infectious diseases, home healthcare, monitoring of older adults, sleep monitoring, and animal health monitoring.
The lab covers everything from system design and hardware development to biosignal processing and clinical evaluation.
Key terms
- Vital signs
- Basic measured values that indicate the state of the body, such as heart rate, respiration, body temperature, and blood pressure
- Thermography
- A device that measures the infrared radiation emitted from the body surface to determine body temperature without contact
- ToF camera
- A small device that can calculate the distance to the object being imaged. It is used to observe chest movement
- NICU
- Neonatal intensive care unit. The lab cites it as a setting for applying its non-contact measurement system
ResearchResearch themes
The Sun Lab studies signal processing and image processing for measuring heart rate, respiration, body temperature, and blood pressure without touching the body, using remote sensors such as radar, thermography, RGB cameras, and ToF sensors. To bring medical systems that implement this technology into practical use, the lab also handles everything from system design and hardware development to biosignal processing and clinical evaluation.
*Illustrative imageNon-contact measurement for children and the NICU
Children may cry or move during measurement with contact-type devices because of anxiety or tension. The lab develops a non-contact measurement system aimed at use in the neonatal intensive care unit (NICU), using signal processing algorithms designed specifically for children to ensure measurement accuracy and stability.
*Illustrative imageMeasuring respiration with a ToF camera
Abnormal breathing is an early sign of disease, but respiration is rarely measured in clinical settings. The lab studies a system that uses a ToF camera to capture the tiny up-and-down movement of the chest during breathing and calculate the respiratory rate, and that uses the respiratory rate and the shape of the respiratory waveform as indicators for diagnosing disease.
*Illustrative imageInfectious disease screening with camera images
To make infectious disease screening at airport quarantine more sensitive, the lab develops a system that measures heart rate, respiration, and body surface temperature without contact, using a CCD camera and thermography. It works on improving measurement accuracy through signal processing and image processing, and is also researching the use of machine learning to judge whether a person is healthy or symptomatic.
*Illustrative imageRadar-based monitoring and sleep assessment
Radio waves that are harmless to the human body are directed at the chest, and respiratory rate and heart rate are obtained from the minute body movements caused by breathing and heartbeat. The lab is working toward practical use of a system placed under the bed to monitor older adults and hospitalized patients, and of a system to assess sleep.
MembersFaculty
The Sun Lab's members consist of faculty and students in the doctoral program, the master's program, and the undergraduate program.As of 2026
- Faculty memberGuanghao Sun
- Faculty memberMasaki Kurosawa
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Thermal-image” MartinThoma / CC0 (cropped)
- Non-contact measurement for children and the NICU: “UTI Neonatal - Hospital Mário Dourado Sobrinho - Irecê - BA” Manu Dias / AGECOM / CC BY 2.0 (cropped)
- Measuring respiration with a ToF camera: “Intel Realsense depth camera D435” Marc Auledas / CC BY-SA 4.0 (cropped)
- Infectious disease screening with camera images: “Airport Thermographic Camera” איתן טל Etan Tal / CC BY 3.0 (cropped)
- Radar-based monitoring and sleep assessment: “Sleep monitoring station ( )” Jean-Etienne Minh-Duy Poirrier from USA / CC BY-SA 2.0 (cropped)
- Related lab (Haneda Lab): “Dodecahedral-microphone-array-DHMA” Kazunobu Kondo, Yusuke Mizuno, Takanori Nishino, Kazuya Takeda / CC BY 4.0 (cropped)
- Related lab (Itakura Lab): “AFRL-developed physiological monitoring system undergoes flight tests (8340359)” U.S. Air Force AFRL by [null Courtesy] / Public domain (cropped)
- Related lab (Nakashika Lab): “Siemens Studio for Electronic Music - Console, Signal generator, Tape recorders - Deutsches Museum, 2010” pixabay: Stefan Schweihofer / CC0 (cropped)
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