Photogrammetry and Reverse Engineering
Photogrammetry and Reverse Engineering
(OP)
We are a Tool & Die Company looking to get into scanning or photogrammetry to collect data (pt cloud information)in order to do hard cutting on our tools as well as keep our CAD data up to date. I have recently been introduced to Photogrammetry or Photo Imagery which can also be used in inspection which would be an asset to us.
Any info would be greatly appreciated
Any info would be greatly appreciated





RE: Photogrammetry and Reverse Engineering
RE: Photogrammetry and Reverse Engineering
My experience is that the results from the GOM scanner carried the least "noise" and the registraion of one scan to the next adjacent scan was the most accurate. The Laser scanner is quicker to setup and can be used in a wider range on environments.
Be aware though that the scanner is only half the story, you need to consider what software you'll use to process the cloud data. Data sets of 2 - 4 million points are not uncommon with 3D scans which can cause most CAD systems trouble with handling them.
The scans will need "processing", you'll want to remove any "noise" in the scan to ensure accuracy of the data, and your likely to need to join adjacent scans together accurately if the area you wish to scan cannot be captured in a single hit. Once the scan is clean you then need to be able to run some sort of diagnosis to compare the scan to surface data you used to cut the tool.
I've used both Imageware and ICEM for cloud manipulation and each has it's role. Imageware probably has the edge for inspection purposes and cleaning up the scan, whereas ICEM has the edge for Reverse Engineering. I used Alias StudioTools a few years ago, but at the time it's scan module wasn't up to the same level as the other two - that may have changed now though.
These applications are quite expensive and I know there are cheaper options now available but I don't have experience of these.
RE: Photogrammetry and Reverse Engineering
Trying photogrammetry in rec.crafts.metalworking got some 5 year old hits.
Google has some theory items available.
Maybe some good stuff here
http://www.geodetic.com/Downloadfiles/Basics%20of%20Photogrammetry.pdf
RE: Photogrammetry and Reverse Engineering
Photogrammetry first found application in map making using rectified overlapping aerial photos. Many years ago I visited the headquarters of government mapmaking in Alexandria VA, and I found the process fascinating.
Using twin projector cameras and polaroid viewers, the operator would scribe around the film where the image appeared to be intersecting and projecting above the working elevation. Successive intersections at higher elevations were drawn of contour lines.
The "mapping" definition of mechanical parts would follow the same logic except the process now is no doubt computerized using lasers.
RE: Photogrammetry and Reverse Engineering
I successfully reverse engineered many tools and parts using this method. It is not a quick and automatic process, even with the software, but the software is about 90% of the package. Talk to more users and gather information and before purchasing a unit really do your homework.
Brandon Jacobsen
Product Design Engineer - Catia
RE: Photogrammetry and Reverse Engineering
http://www.maxnc.com/