| 摘要 |
An imaging system for and method of imaging product in a product flow (F), the system comprising: an illumination unit for illuminating product in the product flow with illumination at first and second, different wavelengths or ranges of different wavelengths; a detector unit (15) for detecting reflected illumination from product in the product flow, wherein the detector unit comprises first and second line array detectors, the line array detectors (17a, 17b) each comprising a plurality of pixel elements and extending as lines across a width of the product flow, one line downstream of the other, whereby product passing a pixel element of the first line array detector passes a corresponding pixel element of the second line array detector; a control unit for triggering the first and second illumination sources to flash sequentially at a scan rate corresponding to the flow rate of the product flow; and an image processing unit for successively reading the pixel lines of the first and second line array detectors and constructing images of the product at each of the illumination wavelengths or ranges of illumination wavelengths.
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