Patent ID: 8233526

Claim:
Encoder for coding a video signal, comprising: means for acquiring a first digital signal (S 1 ) representative of a video signal, said digital signal comprising a sequence of numerical images; means for operating a spatial transformation (TS) of that first digital signal (S 1 ) in order to generate at least a second digital video signal (S 2 ) having a lower spatial resolution with respect to that of said first digital signal (S 1 ); means for carrying out a motion compensated temporal transformation (TT) of the at least second digital video signal (S 2 ) generating a third digital signal (S 3 ), said transformation (TT) leaving substantially unchanged said spatial resolution of the second digital signal video (S 2 ); means for carrying out an operation of compression (CE) of said third digital signal (S 3 ) in order to generate a first digital compressed signal (Sc); means for generating a reconstructed signal (Sr) equivalent to that obtainable by means of a decompression of the said first digital compressed signal (Sc); means for carrying out a motion compensated temporal transform of the first digital video signal (S 1 ) in order to generate a first temporally transformed digital signal (St); means for carrying out a spatial transformation (TS) of at least a portion of said first temporally transformed digital signal (St) in order to obtain a temporally-spatially transformed digital signal (S 4 ) having a lower spatial resolution with respect to that of at least a portion of said first temporally transformed digital signal (St) comprising a first component ( 10 ) and a second component ( 11 ), where said first and second components represent in combination the same informative content of the at least a portion of said temporally transformed digital signal (St), said spatial transformation (TS) being adapted to generate said first component ( 10 ) so that it has the same spatial resolution as the third temporally transformed digital signal (S 3 ); means for generating a prediction error signal (Sp) representative of the difference between said first component ( 10 ) and at least a portion of the reconstructed signal (Sr) corresponding to the portion of the first temporally transformed digital signal (St); and means for carrying out an operation of compression (CE) of said prediction error signal (Sp) and of said second component ( 11 ) in order to generate a second digital compressed signal (Sc 2 ).