ISIS; An Information-efficient Spectral Imaging System
A specialized hyperspectral imager has been developed that preprocesses the spectra from an image before the light reaches the detectors. This "optical computer" does not allow the flexibility of digital post-processing. However, the processing is done in real time and the system can examine = 2 x 10{sup 6} scene pixels/sec. Therefore, outdoors it could search for pollutants, vegetation types, minerals, or man-made objects. On a high- speed production line it could identify defects in sheet products like plastic wrap or film, or on painted or plastic parts. ISIS is a line scan imager. A spectrally dispersed slit image is projected on a Spatial Light Modulator. The SLM is programmed to take the inner product of the spectral intensity vector and a spectral basis vector. The SLM directs the positive and negative parts of the inner product to different linear detector arrays so the signal difference equals the inner product. We envision a system with one telescope and =4 SLMS.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Chief Financial Officer (CR)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1262
- Report Number(s):
- SAND-98-2114C; 65010300000; ON: DE00001262
- Resource Relation:
- Conference: Imaging Spectrometry IV, San Diego, CA (US); 07/19/1998-07/24/1998
- Country of Publication:
- United States
- Language:
- English
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