...Vision

Here we use ``computer vision'' in a narrow sense denoting computational and physics-based vision.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...state

Strictly speaking, since active cameras in the real world have physical bodies, their actions can change the world state. But we neglect such exceptional cases.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...camera

From a technical point of view, an APS camera can be called a fixed viewpoint active camera.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...zoom

Note that we have been able to model SONY EVI-G20 as an APS camera even if its zooming parameter is changed.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.