| 摘要 |
The present invention relates to the production of instantaneous or non-instantaneous multi-band images, to be transformed into multi- or hyperspectral images, comprising light collecting means ( 11 ), an image sensor ( 12 ) with at least one two dimensional sensor array ( 121 ), and an instantaneous colour separating means ( 123 ), positioned before the image sensor array ( 121 ) in the optical path (OP) of the arrangement ( 1 ), and first uniform spectral filters ( 13 ) in the optical path (OP), with the purpose of restricting imaging to certain parts of the electromagnetic spectrum. The present invention specifically teaches that a filter unit (FU) comprising colour or spectral filter mosaics and/or uniform colour or spectral filters mounted on filter wheels ( 114 ) or displayed by transmissive displays ( 115 ), is either permanently or interchangeably positioned before the colour separating means ( 123 ) in the optical path (OP) in, or close to, converged light (B). Each colour or spectral filter mosaic consists of a multitude of homogeneous filtering regions. The transmission curves (TC) of the filtering regions of a colour or spectral filter mosaic can be partly overlapping, in addition to overlap between these transmission curves and those belonging to the filtering regions of the colour separating means ( 123 ). The transmission curves (TC) of the colour or spectral filter mosaics and the colour separating means ( 123 ) are suitably spread out in the intervals of a spectrum to be studied. The combination of the colour separating means ( 123 ) and the spectral or colour or spectral filter mosaics produces different sets of linearly independent transmission curves (TC). The multiple-filter image captured by the image sensor ( 12 ) is demosaicked by identifying and segmenting the image regions that are affected by the regions of the multiple filter mosaic, and after an optional interpolation step, a multi-band image is obtained. The resulting multi-band image is transformed into a multi- or hyperspectral image.
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