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The first one is basically some printed marker — so you need to print something, or buy something, or get something which the app can recognize.
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Image processing is performed using Cantag, an open-source software toolkit for building marker-based vision (MBV) systems that can identify and accurately locate printed markers in three dimensions.
For our current application, simply printing markers and placing them in the environment is an easier and more stable way of tracking the environment.
Conversely, String's approach to AR is 'vision-based' and launches from print markers.
The campaign started with an offline component: people were first given free shirts with an AR marker printed on the front.
Any inaccuracy in the positioning of the pattern on the paper was corrected for by aligning markers printed as part of the pattern to reference markers drawn on the PMMA sheet.
To make ends meet, principals have trimmed after-school programs, shrunk their support staffs and tightened their schools' use of things like printing paper, markers and Post-it notes.
The method is inexpensive as it uses only a low-cost RGBD sensor, e.g., Microsoft Kinect or ASUS Xtion, and Augmented Reality (AR) markers printed on paper sheets.
In all experiments, the accuracy of the paper positioning in the phantom was assessed using radioactive cross-shaped markers printed at the top (T), left (L) and right (R) of the printout.
All that users need to do is to fire up the free Shot Note iPhone app, take pictures of their notes and let the app digitize and store the content in an iPhone screen-friendly format through OCR markers printed on the paper.
Check for the relevant markers printed on the radiograph.
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