Bionic Birdlike Imaging Using a Multi-Hyperuniform LED Array

• Published in: Sensors (Basel, Switzerland) Vol. 21; no. 12; p. 4084
• Main Authors: Zhao, Xin-Yu, Li, Li-Jing, Cao, Lei, Sun, Ming-Jie
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 14.06.2021; MDPI
• Subjects: Aliasing; Arrays; Bionics; Birds; Color imagery; color misregistration; Communication; Digital cameras; Digital imaging; Experiments; frequency aliasing; Geometry; Image degradation; Image management; Image quality; multi-hyperuniform; Photoreceptors; Pixels; Retina; single-pixel imaging; Vision systems
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s21124084

Digital cameras obtain color information of the scene using a chromatic filter, usually a Bayer filter, overlaid on a pixelated detector. However, the periodic arrangement of both the filter array and the detector array introduces frequency aliasing in sampling and color misregistration during demosaicking process which causes degradation of image quality. Inspired by the biological structure of the avian retinas, we developed a chromatic LED array which has a geometric arrangement of multi-hyperuniformity, which exhibits an irregularity on small-length scales but a quasi-uniformity on large scales, to suppress frequency aliasing and color misregistration in full color image retrieval. Experiments were performed with a single-pixel imaging system using the multi-hyperuniform chromatic LED array to provide structured illumination, and 208 fps frame rate was achieved at 32 × 32 pixel resolution. By comparing the experimental results with the images captured with a conventional digital camera, it has been demonstrated that the proposed imaging system forms images with less chromatic moiré patterns and color misregistration artifacts. The concept proposed verified here could provide insights for the design and the manufacturing of future bionic imaging sensors.