December 2012
Intermediate to advanced
340 pages
8h 3m
English
Content preview from Mastering OpenCV with Practical Computer Vision ProjectsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Placing a marker in 3D
Augmented Reality tries to fuse the real-world object with virtual content. To place a 3D model in a scene, we need to know its pose with regard to a camera that we use to obtain the video frames. We will use a Euclidian transformation in the Cartesian coordinate system to represent such a pose.
The position of the marker in 3D and its corresponding projection in 2D is restricted by the following equation:
P = A * [R|T] * M;
Where:
- M denotes a point in a 3D space
- [R|T] denotes a [3|4] matrix representing a Euclidian transformation
- A denotes a camera matrix or a matrix of intrinsic parameters
- P denotes projection of M in screen space
After performing the marker detection step we now know the position of the four marker corners in ...
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