Indexed Pixel Image Acquisition Device

An image acquisition device comprising an array of reference photosensitive-elements, hereinafter referred to as photosites, an array of target photosites, and a selective absorption layer, constructed from a material capable of selectively absorbing light of different wavelengths, said selective absorption layer being interposed betwixt the reference and target photosites arrays, and wherein said reference photosites array is precisely aligned to said target photosites array, thereby causing homologous target and reference photosites to be exposed to light of the same wavelength, and said image acquisition device further comprising measurement means capable of determining the intensity of the light, at each reference and each target photosite, and processor means, capable of determining the relationship between the light intensity at the target and at the reference photosite of an homologous pair, and wherein said reference photosites array is directly exposed to an incident light beam, entering said image acquisition device, whereas the same light beam is coerced to traverse the selective absorption layer, prior to impinging against said target photosites array, causing a difference between the intensity of the light falling on two homologous photosites, said difference being unambiguously dependent on the incident light wavelength, and thereby the wavelength of a light beam striking a homologous photosites pair being determined by processing said light intensity difference, preferably in combination with the unaltered light intensity, at the reference photosite.