29 APPLICATION ARTICLES STEMMER IMAGING www.stemmer-imaging.co.uk Hyperspectral imaging reveals blister


pack contents A hyperspectral imaging system from Stemmer Imaging has been used to inspect blister packs to ensure that they are fully populated with the correct tablets. This application makes use of the fact that a lot of packaging material is transparent to infrared light meaning that the technique can be used to examine product inside its packaging. Organic materials selectively absorb infrared light at different wavelengths depending on their composition. This gives distinctive ‘fingerprints’ which can be used to uniquely identify them. Hyperspectral imaging is a novel imaging approach that utilises spectral information to reveal things that traditional machine vision cannot show – namely the chemical composition of organic materials.


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Hyperspectral imaging of paracetamol blister packs The ‘chemical colour imaging’ approach used here produces an image where the


contents are colour coded according to their chemical composition, making it possible to differentiate between different materials. Looking at the images of the blister packs shown here, paracetamol is colour-coded green, while ibroprufen is colour-coded blue. The images clearly show a pack fully populated with paracetamol tablets, one with a tablet missing, and, crucially, one containing a rogue ibuprofen tablet. Cross contamination in a pharmaceutical packing line could have potentially life-threatening consequences for the patient. The implications for the manufacturer could also be massive, both in terms of reputation and in terms of costly product recalls, and possible production line closure while the problem is investigated.


Stemmer Imaging has developed a complete, modular hyperspectral imaging system


for traditional machine vision users, consisting of all the hardware and soſtware needed and which was used in this application. A spectrograph allows the reflected light from the sample to be sorted into its constituent wavelengths and a series of images is built up by sequentially allowing these narrow wavelength bands of IR light from the sample through to an IR-sensitive camera. These images are combined to form a three- dimensional hyperspectral data cube. Flexible, high-speed data processing soſtware extracts data from the complex data cube which is processed in real time to produce an image where the output of each pixel is colour coded according to the chemical composition of the material it is looking at. It is then possible to use standard machine vision colour sorting solutions, making chemical material properties accessible to the machine vision engineer.


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