Patent ID: 9652827
Date: 2017-05-16
CPC Classifications: G01J,G02B,G06T,H04N

Claim:
1. An imaging system for acquisition of color images comprising: an image sensor; a tunable spectral filter arranged in an optical path of light propagation towards said image sensor; and a controller connected to said image sensor and to said tunable spectral filter, and adapted for generating a colored image by sequentially operating said tunable spectral filter for sequentially filtering light passing towards the image sensor with three or more different spectral filtering curves during three or more corresponding integration time durations; wherein said tunable spectral filter is an etalon configured such that transmission peaks of said spectral curves have full-width-half maximum (FWHM) in the range of about 50 to 80 nm and free spectral range of at least 300 nm, said etalon comprising a pair of reflective surfaces, at least one of the reflective surfaces comprising at least one of the following: (i) a layer of high refractive index of at least n=2.3, or (ii) a layer of low refractive index, smaller than n=1; thereby providing that a thickness of said etalon does not exceed 1 mm.