Compressive Spectral Imaging Based on Hexagonal Blue Noise Coded Apertures

You are here

Top Reasons to Join SPS Today!

1. IEEE Signal Processing Magazine
2. Signal Processing Digital Library*
3. Inside Signal Processing Newsletter
4. SPS Resource Center
5. Career advancement & recognition
6. Discounts on conferences and publications
7. Professional networking
8. Communities for students, young professionals, and women
9. Volunteer opportunities
10. Coming soon! PDH/CEU credits
Click here to learn more.

Compressive Spectral Imaging Based on Hexagonal Blue Noise Coded Apertures

By: 
Hao Zhang; Xu Ma; Daniel L. Lau; Jianchen Zhu; Gonzalo R. Arce

The coded aperture snapshot spectral imager (CASSI) is a computational imaging system that acquires a three dimensional (3D) spectral data cube by a single or a few two dimensional (2D) measurements. The 3D data cube is reconstructed computationally. Binary on-off random coded apertures with square pixels are primarily implemented in CASSI systems to modulate the spectral images in the image plane. The design and optimization of coded apertures have been shown to improve the imaging performance of these systems significantly. This work proposes a different approach to code design. Instead of traditional squared tiled coded elements, hexagonal tiled elements are used. The dislocation between the binary hexagonal coded apertures and the squared detector pixels is shown to introduce an equivalent grey-scale spatial modulation that increases the degrees of freedom in the sensing matrix, thus further improving the spectral imaging performance. Based on the restricted isometry property (RIP) of compressive sensing theory, this article derives optimal coded aperture patterns under a hexagonal lattice which obey blue noise spatial characteristics, where “on” elements are placed as far from each other as possible. In addition, optimal coded apertures used in different snapshots are complementary to each other. The superiority of hexagonal blue noise coded apertures over the traditional coded apertures with squared tiled elements is shown.

SPS on Twitter

  • Attention Region 7! Join us today at 10:00 AM ET for the Region 7 Member Forum, during which SPS leaders and staff… https://t.co/plFMa08CcD
  • RESCHEDULED WEBINAR: "Hybrid Digital and Analog Beamforming Design for Large-Scale Antenna Arrays," originally sche… https://t.co/AtbofklFxP
  • Starting soon: The 2020 IEEE TENCON is happening now, and Women in Signal Processing leaders will be presenting in… https://t.co/60fQiVSanR
  • THIS FRIDAY: The Brain Space Initiative Talk Series continues with Daniele Marinazzo presenting "Connectivity throu… https://t.co/GwIl1SNNmq
  • The SPACE Webinar Series continues this Tuesday, 17 November at 11:00 AM ET when Yoram Bresler presents "Two Topics… https://t.co/FZs8Z9GanT

SPS Videos


Signal Processing in Home Assistants

 


Multimedia Forensics


Careers in Signal Processing             

 


Under the Radar