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Compressed ultrahigh-speed single-pixel imaging by swept aggregate patterns
Patrick Kilcullen1, Tsuneyuki Ozaki1, Jinyang Liang2
1Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, QC, J3X 1P7, Canada.
Nature Communications
|December 22, 2022
Summary
Single-pixel imaging (SPI) is now faster and more versatile. The new SPI-ASAP system overcomes speed and accuracy limitations, enabling high-frame-rate imaging for various applications.
Area of Science:
- Optics and Photonics
- Computational Imaging
Background:
- Single-pixel imaging (SPI) offers a unique approach to image acquisition using coded illumination and a single-point detector.
- Existing SPI systems face limitations due to slow digital micromirror device (DMD) refresh rates and computationally intensive compressed-sensing (CS) reconstruction.
- Prior attempts to increase SPI speed, like mechanical masks, compromised reconfigurability and accuracy.
Purpose of the Study:
- To develop an accelerated single-pixel imaging system (SPI-ASAP) that overcomes the speed and reconfigurability limitations of conventional SPI.
- To introduce a novel, lightweight compressed-sensing (CS) reconstruction algorithm optimized for high-speed video streaming.
Main Methods:
- SPI-ASAP integrates a digital micromirror device (DMD) with laser scanning hardware for rapid pattern projection (up to 14.1 MHz).
- A new CS reconstruction algorithm, based on S-cyclic matrices, is developed for efficient, parallelized computation.
- The system supports tunable frame sizes up to 101x103 pixels.
Main Results:
- Achieved pattern projection rates up to 14.1 MHz, significantly enhancing imaging speed.
- Developed a real-time video streaming capability at 100 frames per second (fps) using the lightweight CS algorithm.
- Demonstrated reconfigurable imaging in transmission and reflection modes, dynamic imaging in bright ambient light, and offline ultrahigh-speed imaging up to 12,000 fps.
Conclusions:
- SPI-ASAP represents a significant advancement in single-pixel imaging technology, offering unprecedented speed and flexibility.
- The developed system addresses key bottlenecks in SPI, enabling new applications in dynamic and high-speed imaging.
- The combination of hardware acceleration and efficient algorithms paves the way for real-time, high-performance single-pixel imaging.
