Combined 3D model acquisition and autofocus tracking system for hyperspectral line-scanning devices

Asgeir Bjorgan; Lukasz A. Paluchowski; Svein Tore Koksrud Seljebotn; Lise Lyngsnes Randeberg

doi:10.1117/12.2505593

27 February 2019 Combined 3D model acquisition and autofocus tracking system for hyperspectral line-scanning devices

Asgeir Bjorgan, Lukasz A. Paluchowski, Svein Tore Koksrud Seljebotn, Lise Lyngsnes Randeberg

Proceedings Volume 10870, Design and Quality for Biomedical Technologies XII; 108700D (2019) https://doi.org/10.1117/12.2505593
Event: SPIE BiOS, 2019, San Francisco, California, United States

Abstract

Obtaining a sharp and focused image is essential to fully utilize the advantages of hyperspectral imaging. For line scanning hyperspectral devices, focusing is a challenge in applications where the height and/or position of the imaged object might vary during a scan. Initial focusing is in addition a tedious process that has to be repeated for each sample or measurement. In this paper, a new continuous autofocus tracking system for hyperspectral line-scanning cameras is reported. The presented system is able to automatically and objectively find the correct distance between the camera and the imaged object for proper focus, and retain this focus distance during scan using a laser triangulation system. Concurrent with the focusing, a 3D model of the object is constructed. The system was tested and found to perform well for NIR-SWIR imaging of human hands and test objects with sharp changes in height and contrast. The method is easily adaptable to other spectral ranges and applications, such as industrial conveyor belt applications. The method significantly eases the acquisition of hyperspectral images by ensuring optimal image quality in every scan and eliminating the need for manual refocusing between individual samples.

Citation Download Citation

Asgeir Bjorgan, Lukasz A. Paluchowski, Svein Tore Koksrud Seljebotn, and Lise Lyngsnes Randeberg "Combined 3D model acquisition and autofocus tracking system for hyperspectral line-scanning devices", Proc. SPIE 10870, Design and Quality for Biomedical Technologies XII, 108700D (27 February 2019); https://doi.org/10.1117/12.2505593

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
13 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Cameras

3D modeling

Imaging systems

Hyperspectral imaging

Image quality

Calibration

3D acquisition

Show All Keywords

Keywords/Phrases

Search In:

Publication Years