The 4th dimension in measuring – Mapvision 4DIndustrial photogrammetric applications have increased substantially over the last years. The development of videogrammetry utilizing digital information technology for automated close-range photogrammetric procedures has made it possible to measure objects three-dimensionally in real-time. New Mapvision 4D now offers the 4th dimension in measuring, the Quality Index. Mapvision4D is a non-contact measuring system and designed to serve the measuring needs in telecommunication and automotive production. The system is available as an off-line as well as an on-line application.The new Mapvision 4D represents a total paradigm shift in the measurement of physical objects with a unique Quality Index feature. Thanks to the Quality Index, the Mapvision 4D system provides superb data for Reverse Engineering. With traditional methods such as laser scanning, the resulting 3D data may be useless and require tedious manual cleaning. Mapvision 4D automatically uses only precise points that are verified by the Quality Index. The method behind the Mapvision 4D real-time machine vision system is based on image analyses of pictures taken by the cameras. The system consists of CCD video cameras, main control unit, power source for the cameras, scanner and light sources. Light generates a visible spots on the surface of the object. The cameras detect the spot and can measure its location three-dimensionally. A real time photogrammetric system Mapvision 4D is a real-time photogrammetric system using digital images to identify and locate the details of an object in three dimensions. All geometric information for the 3-D determination of object details is stored in the form of 2-D images. The 3-D coordinates of the object can be calculated by using at least two overlapping 2-D images.
The cameras can be freely positioned in relation to the object being measured. This free camera orientation pattern avoids camera set-up errors. The system calibration allows for systematic geometrical distortions caused by the camera lenses. Many types of camera optics may be used, permitting any volume to be measured by the system.
The main users of the method and software behind Mapvision 4D are the telecommunication and automotive industries. Typical 3-D applications include the inspection of car bodies and mobile phone components. Another interesting application is analyzing the distortion of aircraft bodies and monitoring their deformation. Providing the accuracy the industry needs The nominal accuracy and measurement time values of the system can be adapted to each application. At least two cameras are needed for the three-dimensional measurement of an object. The use of four or more cameras increases the accuracy of the system and the automatic recalibration procedure is an integral part of the system. The Mapvision 4D standard scope includes four cameras. The system can compare the measurement results of stable contact points to reveal possible camera movements. The system is maintenance-free, while its software can accept a new camera into the system through a sophisticated calibration procedure, in the case of a camera breakdown. The accuracy of the Mapvision 4D measurement machine does not come from heavy machinery but rather from sophisticated software. The lightness of mechanical components offers incredible flexibility to install Mapvision on any production line to monitor the quality of semi-finished components. The light source used for measurements can be selected according to the material to be measured:
The Mapvision 4D measurement machine not only provides x,y,z coordinates but also the patented Quality Index that indicates how accurately each measured point lies on the object.
Due to effective use of the Quality Index, the Mapvision 4D measurement machine provides superb data for Reverse Engineering. With traditional methods such as laser scanning, resulting 3D data is useless (especially near sharp edges) and requires tedious manual cleaning. Mapvision 4D automatically uses only precise points that are verified by the Quality Index. Multipoint measurement technology Patented multipoint measurement technology offers unparalleled speed in measuring complex shapes of modern plastic parts up to 80 points per second.
Glass is transparent – but not for GlassVision4D GlassVision4D is an interesting version of Mapvision 4D system. The difference of GlassVision4D when compared with the basic measuring system for other materials, is the use of a scanner and UV light source. A UV light spot produced by the light source is reflected by scanner mirrors onto the glass surface. The UV light generates a visible fluorescent spot on the surface. The spot can be seen by the cameras and measured three-dimensionally. Using a scanner any number of spots can be projected onto the glass surface. This provides great flexibility in measuring. The measuring speed is 5 points per second. In on-line applications it is possible to build feedback into the process control minimizing production losses and manual measuring. Any damaged tooling will also be easier to trace. The original 3-D coordinates of the glass are measured from the original sample glass before the actual on-line measuring or preferably taken from the corresponding CAD file. In off-line application GlassVision4D provides the possibility for making complete surface models and CAD comparisons.
Contact: Mapvision Ltd
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