Vision in Action - Autumn 2015

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24 APPLICATION ARTICLES Mosquito tracking experiments in Tanzania www.ukiva.org Automated 3D Labelling of fruit Counting machine with integrated vision system and controls LAMBDA PHoToMETRICS www.lambdaphoto.co.uk Infrared tracking of mosquito behaviour Despite massive improvements in diagnostics and treatment, malaria continues to infect around 200m people each year, killing nearly 600,000. Among the new tools and tactics being deployed to help counter the spread of the disease are optical techniques and quantitative data analysis. A multi-camera infrared tracking system has been developed for the Liverpool School of Tropical Medicine and the University of Warwick by Lambda Photometrics and Norpix in order to monitor mosquito behaviour with a view to designing more effective controls of malaria transmission. Norpix recording and tracking soſtware records images from two 4 MPixel Baumer Optronics NIR cameras at 100 frames per second for 6 hours. The system was evaluated at Liverpool School of Tropical Medicine before being deployed in Tanzania to understand mosquito behaviour in sub-Saharan dwellings. These field tests were carried out on the edge of a swamp which is a mosquito breeding area, with the equipment powered by generators. The research team has submitted a publication to Nature Scientific Reports with follow up papers in the Royal Society Interface and in the Malaria Journal. There are plans to add 2 further cameras which would allow the research to expand to other parts of Africa where there are insecticide resistant mosquito populations. A third project would require the use of 8 cameras, all capturing moving mosquitos in sync. LooP TECHNoLoGy www.looptechnology.com 3D product labelling of fresh produce Loop Technology has developed a robot and 3D imaging system capable of automatically identifying and labelling individual fresh produce items as they pass along a conveyor belt. Developed for a major supermarket chain, the new system provides the versatility to deal with a variety of lower volume products such as pomegranates, or melons allowing a previously labour-intensive process to be automated. The manual process of individual labelling requires the removal from the growers packaging, manual label application and subsequent repackaging. The system uses a 3D time of flight camera from Creative (Singapore) to produce a 3D point cloud of the conveyor scene, as it moves through the vision enclosure. The camera was chosen for the way it responds to organic surfaces such as the skin of fruit. A conveyor runs the full length of the system allowing for manual loading or integration into a larger production line. The 3D camera scans and produces a 3D image of the product as it is placed on the conveyor. This information is communicated to the robot(s) resulting in automatic identification of the product; feature avoidance information such as stalk position; product orientation and the particular label required. It then picks the correct label and by matching the scanned data to the product details selected, ensures it is placed in the correct position, even though the products may come down the line in a random orientation. Labels are printed as they are required to minimise wastage. A major benefit of the system is that new products can be added to the system using a simple training routine, via a browser-based setup interface even whilst the machine is in operation. This is ideal for applications where label location varies and where products and batch sizes need to be changed quickly and easily. Video link: www.youtube.com/watch?v=R6j2d2rneiIs MULTIPIX IMAGING www.multipix.com Pharmaceutical tablet packing and inspection UK-based Pharma Packaging Systems (PPS) specialise in the design and manufacture of electronic counting systems for tablets and capsules for the pharmaceutical industry. Machine Vision Technology Ltd, an independent vision systems integrator, in conjunction with Multipix Imaging, has developed an integrated inspection system for these machines. This measures tablet length, width, area and completeness as well as verifying the tablet is correct to avoid cross contamination (rogue tablets from another batch). Cross contamination could result in the whole factory being shut down for a period in addition to crippling fines being imposed. Cameras are placed above the final vibrating trays that feed and separate the product in order to inspect the tablets or capsules just before they are counted and bottled. Each camera images 6 lanes of tablets having a typical feed rate of up to 2500 tablets/minute. Eighty images/second are captured across 24 lanes of continuous tablet flow. Each tablet is typically inspected ten or more times as it passes through the camera’s field of view. The vibrating tablets can touch and move irregularly and therefore can present to the camera in any possible orientation. The vibratory feeders start and stop several times a minute and feed at varying rates to maximise the throughput into each bottle as the bottles index past. Very sophisticated soſtware was developed in order to track each individual tablet. The system has to find continued on page 27
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Page 1 and 2: Editor: Dr Denis Bulgin Advertising
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