patterns, is used in combination with Imec’s snapshot spectral 2D sensor. A standard structured light projector will
project a pattern of light on the object and measure the deformation in the light to get a 3D image. Tis works by shining a sequence of patterns onto the object. Tridimeo, by contrast, uses one
multispectral camera with 16 bands, and projects 16 patterns – each at a different wavelength – at the same time. ‘It’s snapshot imaging,’ Partouche explained. ‘It can make it much faster than regular structured light 3D scanners.’ Tis is the case compared to white or blue light structured-light 3D scanners, although laser-based scanners can also be very fast, thanks to the available laser power. Tridimeo developed its initial solution
for Renault, a robot guidance system for depalletising semi-random kit of car body parts to load robot islands. Te robot islands are for welding the parts together. Renault wanted the camera to be attached
to a robot arm, so it contains no moving parts. Te car manufacturer wanted a 3D localisation precision of less than 1mm, taking less than two seconds to make the scan plus calculation per part, explains Elvis Dzamastagic, Tridimeo’s international business development manager. Renault also wanted something that’s fast to implement, that would correct for ambient light, and be robust to bright, stamped car body parts. In bin picking in general, one advantage
of the system is it is able to distinguish between the parts to be picked and the bin itself using spectral information. Tis
means the pickable objects can be detected and the rest of the image discarded, which makes the 3D localisation algorithm fast and avoids collisions between the robot arm and the bin. Being able to remove the bin from the data points making up the scene also makes it a much more robust solution. ‘When picking the last part at the bottom of a bin – a flat component, say a few millimetres thick – if you don’t have multispectral I don’t think it’s easy to locate the part robustly and precisely because it’s so thin,’ Partouche says. In bin picking, Tridimeo would scan the bin for each pick. ‘Te specification from our customers was that you need to scan, calculate in 3D, locate the part, and calculate the robot arm trajectory with no collisions in less than three seconds,’ Partouche explains. ‘We’re targeting picking at around six parts per minute. Te bin is imaged as the robot leaves the bin to calculate the next pick while the robot is placing the part elsewhere. Te snapshot is a few hundred milliseconds at most.’ To make the images robust to ambient
light or reflections from shiny parts, two or more acquisitions would be made if needed, either to measure and subtract ambient light, or add images at different exposures together to get a high-dynamic-range image. Te solution can be installed in factories using various industrial communication protocols, like Profinet and Ethernet/IP. Beyond robot guidance, Tridimeo’s
technology can be used for quality inspection, such as detecting a sealing joint on a car body part, even though both the joint and part are a similar colour – they can be distinguished through spectral characteristics. Tis could be used in car manufacturing to check whether the joint is absent or present, or identify its location. In addition, the technology can be used
to inspect the colour of car parts directly after painting, where the spectral data gives a colour measurement and the 3D data measures the shape and tilt of the part to take this into account in the apparent spectral output. ‘If you don’t have the 3D, you don’t know what to compare the spectral output with,’ Partouche says. ‘Tat is to say, tilting the part or changing the viewing angle would change the spectrum of light reflected back to the camera, so you need 3D information.’ In the future, Dzamastagic says plastic
processing and food inspection might be further application markets for Tridimeo’s technology, although at the moment its software is more suited to robot guidance. Tere are now reasonably mature 3D
Tridimeo’s high-speed multispectral 3D camera
www.imveurope.com | @imveurope
vision products on the market; these two companies show there’s also plenty more innovation out there when it comes to measuring the third dimension. O
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