Modelling and Retrieving Video via Moving Objects (23)

Time

We model time via instants and intervals.

An interval is defined by start and end instants: I = (t_s, t_f)

Operations on intervals:

start(I) = t_s finish(I) = t_f duration(I) = t_f - t_s I₁ + I₂ = (start(I₁), finish(I₂))

All scene-time is measured relative to start of scene.

If duration of scene is T, then scene interval I_S = (0,T)

Database may store absolute start time elsewhere.