Hyperspectral imaging with liquid-crystal tunable filter for biological and agricultural assessment

Chengye Mao; Jerry Heitschmidt

doi:10.1117/12.336879

14 January 1999 Hyperspectral imaging with liquid-crystal tunable filter for biological and agricultural assessment

Chengye Mao, Jerry Heitschmidt

Proceedings Volume 3543, Precision Agriculture and Biological Quality; (1999) https://doi.org/10.1117/12.336879
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

A hyperspectral imaging system has been developed to provide the capability of both airborne and ground/laboratory data acquisitions. The system consists of modular front imaging optics with a liquid crystal tunable filter (LCTF), a CCD video camera, a frame grabber and a portable computer system. The spectral range is form 450 nm to 750 nm with a 10 nm bandpass for each band acquired. The system can capture different spectral images at a rate up to 14 images per second. Hyperspectral imaging with an LCTF provides a new method for hyperspectral image acquisition. The system allows the user to define a wavelength sequence of up to thirty-two spectrums specifically required for individual application, and can quickly switch from the current wavelength to the next during automated image acquisition. Hyperspectral images of crop fields, vegetation, fruits, and meat were successfully captured during laboratory experiments and airborne image acquisition. The constructed spectral image cube not only shows the spatial features of the target, but also reveals the individual pixels with unique spectral signatures. The imaging system with LCTF is, therefore, very useful in biological and agricultural assessment for detecting variations in crop fields, or defects in samples and products.

Citation Download Citation

Chengye Mao and Jerry Heitschmidt "Hyperspectral imaging with liquid-crystal tunable filter for biological and agricultural assessment", Proc. SPIE 3543, Precision Agriculture and Biological Quality, (14 January 1999); https://doi.org/10.1117/12.336879

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