Rewritable broadband filters for color image analysis

Kanae Miyazawa; Markku Hauta-Kasari; Satoru Toyooka

doi:10.1117/12.347718

7 May 1999 Rewritable broadband filters for color image analysis

Kanae Miyazawa, Markku Hauta-Kasari, Satoru Toyooka

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347718
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

In this study, we propose an optical transparent broad-band filter system which can be used to measure a color spectrum and two-dimensional spectral images. The filter function of this system can be changed and rewritten arbitrarily. Spectral distribution of an object color can be represented by a set of inner products between optimized filter functions and the spectral distribution of a sample. In our system, a test image is observed through the filter part consists of a liquid crystal spatial light modulator (LCSLM) and a linear variable filter (LVF) attached together. The intensity image of a sample is taken while the joint device (LCSLM and LVF) is moving just in front of the lens aperture of the CCD-camera. The spectral distribution of the intensity image through the proposed filter almost coincided with the expected filter functions. From the detected intensity images correspond to the inner products between the color filters and a sample, the color spectra of the sample were reconstructed by the use of inverse matrix. The data obtained from the filtering process is only four monochrome images. It is convenient for storing and transmitting the spectral image. The experimental results of measuring a color spectrum and two-dimensional spectral images are presented.

Citation Download Citation

Kanae Miyazawa, Markku Hauta-Kasari, and Satoru Toyooka "Rewritable broadband filters for color image analysis", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347718

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