Patent ID: 7881370

Claim:
A method of selecting, from among N Spatial Video CODECs where N is an integer number greater than 1, the optimum Spatial Video CODEC for a same input signal I, comprising the following steps: obtaining from all the N Spatial Video CODECS, for the same input signal I and a same quality parameter Q, a rate R and distortion measures D, Q being an integer value between 0 and 100, defined by any rate-distortion algorithm to provide a compression of the input sequence with constant rate or with constant distortion, and calculating an optimality criterion by using the value L n =f(R n ,D n ) calculated for all the n from 1 to N, n being the index of the Spatial Video CODEC, where f(R n ,D n ) is a function of R n and D n , wherein the Spatial Video CODECs are aligned according to a theoretical MSE and the quality parameter Q, MSE being the Mean Square Error and computed as MSE = Δ 2 12 = ( 2 ( C 1 - Q / C 2 ) ) 2 12 for the case of uniform quantization with an average step Δ defined as Δ=2 (C 1 -Q/C 2 ) where C 1 controls the minimal and maximal quality and C 2 the variation of the distortion according to quality parameter Q, wherein the optimally criterion is defined as the minimization of said value L n =f(R n ,D n ), wherein said function is defined as the Lagrange optimization f(R n ,D n )=R n +λD n , and wherein the Lagrange multiplier that weighs the relative influence of the rate R and of the distortion D is defined as λ = 1 2 · ln ⁡ ( 2 ) · MSE .