3D Camera Technology and 3D Image Processing tools
3D imaging and image processing is becoming more accessible and being applied to an increasing number of vision systems that can benefit from 3D automated inspection.
Multipix Imaging provide products for 3D image processing, we supply training on different hardware platforms and the use of HALCON imaging software which has a powerful suite of 3D tools.
3D camera technologies explained
Typically this will be using 2 cameras that are pre-calibrated as a single unit, so meaning the physical relationship between the cameras is clearly defined. The 3D image is then achieved by using triangulation of common points in both of the camera views. The perspective from one camera is different to the other when looking at the same point in space and it is this perspective difference that can be used to calculate depth and position data in 3D. Points in each camera view must be distinguishable for stereo imaging to work. The more points (or texture) you have the better the results.
Each model has two integrated CMOS sensors and a projector that casts a random point pattern onto the object to be captured, allowing structures that are not visible or only faintly visible on the surface to be enhanced or highlighted.
With this method of 3D imaging, there is one camera which has a known physical relationship with a laser line projector. The laser projects a line across the object being scanned and the deformation in the laser line, as being captured by the camera, determines the depth of an object at that point on the laser line. These can be purchased as pre-calibrated camera/laser units or you can purchase camera and laser as individual units and calibrate using software tools such as HALCON.
SmartRay ECCO series of 3D laser triangulation cameras are available from Multipix Imaging, for applications that benefit from using pre-calibrated units which can provide high resolution results.
If the application is using a separate camera and laser then we highly recommend the HALCON 3D machine vision library for calibration and also 3D image processing. Multipix can provide numerous camera options and lasers.
3D ToF cameras use either a pulsed or continuous wave NIR light to illuminate the object/scene. When using pulsed light, the time it takes for the light to be reflected back is measured and used to calculate distance. Whereas with continuous wave, it is the phase shift between emitted and reflected light that is measured to determine distance. The Basler ToF uses pulsed NIR and is delivered as a fully calibrated unit with a GigE Vision interface for ease of connectivity. It provides both a 2D image as well as per-pixel depth information.
Check out Basler’s White Paper explaining the processes and applications of a ToF camera…