Modelling and Retrieving Video via Moving Objects (35)

Temporal Extraction

If S is a scene graph and

ST = [ (t₁,xp₁,yp₁), (t₂,xp₂,yp₂),... (t_n,xp_n,yp_n) ]

is a 2D-PIR interval, then S.interval(A,B,ST) is an intveral

I = I₁+I₂+...+I_n

such that there is a subsequence

[ (t₁,xp₁,yp₁,I₁), (t₂,xp₂,yp₂,I₂),... (t_n,xp_n,yp_n,I_n) ]

in R_st(A,B).

If no such sequence exists, the result is the special value Never.