The One-Pix1 kit aims to disseminate hyperspectral imaging as widely as possible by making this technology accessible through ease of use and affordability. By addressing research teams and academics in particular, it brings together a scientific community and offers them an open source solution for sharing and continuous improvement.
Hyperspectral imaging involves measuring more than a hundred images of a scene each at different wavelengths. This makes it possible to obtain fine spatial and spectral information on it. The One-Pix kit is a hyperspectral camera using a new unconventional imaging method called mono-pixel. It reconstructs an image from a single detector by projections of structured patterns. It thus makes it possible to transform a simple spectrometer into a hyperspectral camera operating indoors in the spectral range of the visible. It can, however, be extended to the near infrared for the analysis of the red front of plant scenes. In general, its applications are diverse: precision agriculture, optical sorting, surface characterization and materials analysis, pharmacology, geology / mining, medical diagnostics and guided surgery, etc.
Several offers are offered to future users, ranging from the hardware kit to assemble yourself to the calibrated turnkey kit. Its price of 5000C makes it a major asset compared to the cost of other solutions on the market which requires an investment multiplied by ten. Made economical and easily accessible, the One-Pix kit is a real educational tool. It is indeed the ideal ally for teachers and students to show and discover the functioning of spectral imaging, Fourier optics, image processing / machine learning, spectroscopy,... The interests for research are also numerous: compressed imaging, unconventional imaging, shared platform of common experiments, basic creation (agronomy, environment, geology, health,...), etc.
Principle of operation
The One-Pix kit contains a video projector and a fiber spectrometer with superimposed fields of view. The two are connected and controlled by a Raspberry board Pi.La One-Pix technology consists of projecting a series of structured images (based on the motifs of Bernoulli, Hadamard, or Fourier) on a scene to be imaged. A spectrometer measures the average reflected spectrum of the scene for each projection. An algorithm then reconstructs the hypercube of the scene from all the spectra measured during acquisition, the resolution of the image thus improving as the data is collected. The Raspberry Pi board ensures synchronization between pattern projections and spectrometer measurements. Note that this modular kit can be used with different spectrometers.
Un kit open-source
This kit is associated with a free repository on the GitHub platform. This sharing space contains the documentation to build your own One-Pix hardware kit, which was developed with the primary need to be assembled in a standard fablab with laser cutting. Little wiring (all in low voltage) and no soldering is necessary. The repository also contains all the algorithms for measuring hyperspectral images. Also hosted is all scripts kept up to date. One-Pix is designed to easily implement user developments and thus continuously improve the ergonomics and technical specifications of the instrument. The goal is to create a space for adoption, dissemination and collaboration within a community of users.
One-Pix vs Pro-Pix
The One-Pix kit has been designed for indoor use only. A more powerful version – Pro-Pix – is under development, at the demonstrator stage. The integration of other more robust components will allow the Pro-Pix to operate in outdoor or industrial environments. It will also rely on the algorithms already populated in the GitHub. Its commercialization is already scheduled for 2023.
Marketing under a new brand: Pop
In order to market these two new products – One-Pix and Pro-Pix – Photonics Bretagne has created a new brand called Pop (Photonics Open Projects).
More generally, Pop serves to promote innovative product development collaborations in agrophotonics between Photonics Bretagne and Arvalis – Institut du végétal.