Watching 3D Cameras

Posted by Chuck Harrell on Apr 24, 2015 9:10:00 AM

3dgear3D movies have been around for awhile and we enjoy watching things popout of the screen at us.   But, can the same cameras and system software be used in industrial automation?

To film a 3D image, you need two cameras to film the same scene from exactly the precise angle from which users will be looking at the screen.  

As well as multiple cameras, there are other technologies that involve laser light available to developers of 3D imaging in industrial automation.  These include: Sheet-of-light triangulation (aka laser profiling) uses laser lights to measure/triangulate an objects profile where the resulting sensor iamge is evaluated by the camera core and converted into a single height profile.  The software will then asses the data and use it to build a picture of the object. Time-of-flight is a 3D vision system that evaluates the distance and dimensions of an object by measuring the speed at which the lights return to the sensor.

Unfortunately, these ideas sound easier than they are.  The down side from an industrial automation point-of-view is that it's quite difficult to precisely align the objects in front of the cameras to get the best lighting conditions and the amount of processing power required to achieve a quick result is quite large. Because of these complexities, and the cost of the investment, 3D imaging has never really taken off in industrial automation.

But things are changing and now, largely thanks to devices like Microsoft Kinect, which has driven down the cost of high quality CCDs, cameras and their controlling hardware, it's possible to use just a single camera to produce 3D vision, at least that's what ISRA vsion is claiming.  They say "It is now possible, from one single capatured image, to precisely define a three-dimensional object based on the measurement of only three criteria in all six degress of freedom (postion and orientation)".  As well as being able to recognzie parts in a rack, the single camera can also determine where parts of an object should be placed within a 3D environment.

But even if a single camera doesn't quite fit the criteria, advances in lens and CCD technology are helping to reduce the size and increase the speed of producing 3D images.  Companies like Scorpion Vision are producing steroscopic cameras that have small form factors and can perform 3D vision on the fly.

There are many potential applications for 3D cameras in industrial automation such as: parts verification, surface scanning variety of inspections, general machine vision, robotic guidance, security/surveillance, medical and biometrics, general measurement, completeness check, and the decoding of stamped parts and now that they are cheaper to buy and install, they are more likely to gain traction.



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