Patent ID: 7489726
Filing Date: 2009-02-10
Classification: H04N

Abstract:
1. A method for processing a plurality of videos, comprising: acquiring, in parallel, a plurality of compressed videos, in which compressed frames of each input video are acquired at a fixed sampling rate; applying, concurrently and in parallel, joint analysis to the plurality of compressed videos to determine a variable and non-uniform temporal sampling rate for each compressed video, so that a combined distortion is minimized while a combined frame rate constraint is satisfied for the plurality of compressed videos, in which the combined distortion includes a temporal distortion, and in which the compressed frames are inter-frames; and sampling compressed frames of each compressed video at the associated variable and non-uniform temporal sampling rate to produce a plurality of compressed output videos having variable temporal resolutions, in which the temporal distortion E{Δ where (σ 2 x ,σ 2 y ) represent a variances for x and y spatial gradients in frame i, and (σ 2 Δx , σ 2 Δy ) represent variances for motion vectors between the frame i and frame k in x and y direction.