# Catalogue of Artificial Intelligence Techniques

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## Generalised Cylinders

**Aliases:**
Generalised Cone

**Keywords:**
shape description

### Categories: Vision

Author(s): **Luis Jenkins**

A currently popular method for three-dimensional shape description. Generalised cylinders are a class of objects obtained by extending the definition of a cylinder. An ordinary cylinder is the volume swept out by a circular disc moving perpendicular to a straight line segment that passes through its centre called the axis or spine of the cylinder. A generalised cylinder is then obtained by extending the definition to include things like:

- A curved spine.
- The radius of the disc varying as a function of the position along the spine.
- The cross section being some planar figure other than a circle.
- The cross section held at a non-perpendicular angle to the spine.

### References:

- Marr, D.,
*Analysis of occluding contour*,*Proc. Roy. Soc. Lond.*, vol.B197, 1977, pp.441--475.

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