sunlight to identify drivers who aren’t wearing seatbelts or who are using mobile phones. Te high resolution and low-read noise


Teledyne Dalsa’s Genie Nano M2450 polarised model offers up to 35 frames per second via GigE Vision


real time and displaying them in false colour. Tis information is particularly important when producing parts made from carbon fibre reinforced polymers, as their tensile strength is dependent on the direction of the fibres. Manufacturers can therefore use polarised imaging as a quality control method to minimise the safety risks associated with using such parts. While it’s still too early to say which market


sectors will see the greatest uptake of polarised imaging as it becomes more affordable, Chang predicted that the increasing availability of the format – as a result of Sony’s new sensor – will certainly lead to new applications arising that were previously unachievable using conventional imaging methods: ‘Tere are a lot of academic papers on the possibilities of what polarisation can be used for, but no one has been able to realise these applications because of the previous high costs associated with this technique.’ Flir’s Yeung noted that polarimetry can be


used in surveillance for detecting man-made objects that would otherwise be difficult to identify using traditional visible or thermal imagery. ‘Camouflaged vehicles or structures will still reflect polarised light oriented parallel to the surface that stands out clearly in AoLP mode,’ she explained. Yeung added that by decluttering images


through the removal of unwanted glare and reflections, training deep learning systems can be simplified using polarised imaging. Tis is particularly effective in the high-glare environments encountered by autonomous vehicles, for example. Te convenience of reducing reflections


also extends to traffic monitoring applications, where polarisation cameras could be used to see through car windshields in bright


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of the new IMX250MZR sensor could also enable a wide field of view to be analysed with standard microscopy equipment when studying healthy or diseased tissues in medicine which, according to Yeung, can be differentiated by the polarising properties and optical activity of their biological compounds.


Knowledge is power Even though the low price of Sony’s sensor will make polarised imaging far more appealing to potential end users, as it stands, the industry’s experience with polarisation is currently limited, according to Chang, which may hinder the technology’s widespread adoption. ‘Te biggest potential inhibitor for polarised


imaging to take off is going to be knowledge, as this is a relatively new technology in the industrial market,’ he said. ‘Most are familiar with using a polarising


[Lucid Vision] has also received a lot of queries about whether polarisation can be used to improve existing 3D imaging


filter in front of a camera to reduce glare from objects like metal, which is a very simple application of polarisation. For the more advanced polarised imaging applications, however, knowledge is limited to a niche market, and adoption in the industrial inspection market is at a very early stage. A lot of people, therefore, have to spend time learning how to use the technology to discover its potential.’ For polarised imaging, the configuration of


the lighting surrounding the application is important; for example, the position of the light source, the type of light – polarised or unpolarised – and its colour must all be controlled carefully. ‘Whereas with a standard imaging camera this can usually be figured out manually by the customer by experimenting with different options, with polarised imaging they have to learn a lot more about how the properties of light work,’ said Chang. Companies such as Lucid Vision are


therefore producing educational material, such as tech briefs and whitepapers, to help teach industry members about polarised imaging. ‘We also have support teams and application engineers that can answer customer questions and go out to sites to help people understand how they can use this new technology,’ Chang concluded. O


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