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Automation Technologies 3/2015

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Automation Technologies 3/2015

MACHINE VISION previous

MACHINE VISION previous page 04 Structured Light method Solution: The revolutionary new 6D camera The Perception Camera mvPerCam is the result of development work that was carried out for the purpose of assessing the different 3D procedures. The basis of this principle is the stereo procedure combined with structured light. A third camera has also been integrated in order to achieve a larger field of measurement and to ensure that different camera distances and angles do not have to be specially set up during production. This makes it possible to use the system as a universal multistereo camera. Every combination of two cameras makes it possible to achieve different working ranges. Objects close up to the camera are better captured by cameras that are the shortest distance away and objects that are distant can be better depicted using cameras that are further away. The stereo procedure is dependent on the fact that the same structure is found in both images. In order to make it possible to also measure unstructured areas, the mvPerCam illuminates the object using a structured light, giving the object additional structure. Movement information can be captured alongside depth information, if so desired. These are also present as vectors (vx, vy, vz) in a 3D space. The new system incorporates a 6D camera, which can also be used to determine whether an object is moving away from or towards the camera. These data are also in color and are depicted in the RGB color space. The camera is therefore also equipped for future color applications. The stripe light projection procedure or the laser triangulation procedures have a high resolution, which makes it possible to isolate objects that are close together. A 3D system based on the stereo procedure requires a high X/Y resolution, which restricts the visual field or reduces the frame rate. In order to isolate objects that are close together, additional structured lighting is projected onto the scene using the newly developed camera. Processing of the extensive image data is a complex task and considerably more expensive than it would be to process a 2D gray image. A so-called sensory function has therefore been integrated for this purpose. It is this sensory function that makes the camera very easy to use and therefore renders it possible for use in a wide range of applications. The experienced 3D user can, of course, also process the unfiltered data directly with his/her 3D cloud matching procedure. Typical areas of application for the mvPerCam include the logistics and packaging sectors, such as the fields of product control, pick & place, palletizing, loading and unloading lorries and depalletizing. The camera is also suitable for applications in the fields of transport technology, measuring technology, production control, medical technology/sports, robot guidance, food and recycling. Photogrpahs: teaser fotolia www.matrix-vision.com Features of the 6D camera + Video in real-time (30Hz) + High X-, Y-resolution (1024 x 1024 px) + Measuring range of approx. 27 to 250 cm + Measuring resolution of approx. ±40 μm at 27 + cm; approx. ±3.5 mm at 250 cm + No pseudo-objects + High measurement density due to a high + sensor resolution + Depth chart with an image + Stationary objects permitted + Isolation of objects that are close together + Fast-moving objects permitted + Scan time = one shutter time (10 μs to 30 ms) + Only one camera for close-up and distance shots + Automatic calibration without template + Object recognition based on its movement + Image transmission by GenICam AUTOMATION TECHNOLOGIES 3/2015

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