MULTISPECTRAL SCANNER WITH ENLARGED RANGE, IN PARTICULAR A SINGLE-PASS FLAT SCANNER

摘要

The invention concerns a scanner comprising an integrated photosensitive linear sensor (20) including N photosite parallel lines, with N ≥ 4, preferably, N ≥ 6, and for each photosite line an associated passband optical filter. For each scanning pitch and for each pixel of the analyzed line, it delivers N corresponding quantified partial measurement values, each representing the spectral reflectance of the document collected through the N respective filters. Spectral reconstruction means operate in accordance with an extrapolation method accompanied by learning from reference coloured samples, with a memory (42) storing a knowledge base formed from known spectral reflectance values of said reference samples, and a neuronal network (40) receiving in input N quantified partial values and delivering in output at least one reconstituted quantified value, representing the spectral reflectance of the corresponding pixel of the document.