Method for reduced bit-depth quantization

Details Method for reduced bit-depth quantization Method for reduced bit-depth quantization

H - Electricity

04

N

H04N 7/30 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2576161

A method is provided for the quantization of a coefficient. The method comprises: supplying a coefficient K; supplying a quantization parameter (QP); forming a quantization value (1) from the coefficient K using a mantissa portion (Am (QP)) and an exponential portion (x a e (Q P)). Typically, the value of x is 2. In some aspects of the method, forming a quantization value (1) from the coefficient K includes L = K*A(QP) = K*Am(QP)* (2 A e(Q P)). In other aspects, the method further comprises: normalizing the quantization value by 2N as follows: Ln = L/2N = K*Am(QP)/2(N-A e(Q p)). In some aspects, forming a quantization value includes forming a set of recursive quantization factors with a period P, where A(QP+P) = A(QP)/x. Forming recursive quantization factors includes forming recursive mantissa factors, where Am(QP) = Am(QP mod P), and forming recursive quantization factors includes forming recursive exponential factors, where Ae(QP) = Ae(QP mod P) - QP/P.

Une méthode de quantification d'un coefficient est divulguée. Elle comprend la présentation d'un coefficient K, celle d'un paramètre de quantification (QP), la formulation d'une valeur de quantification (1) à partir du coefficient K en faisant appel à une partie de mantisse (Am (QP)) et à une partie exponentielle (x a e (QP)). Typiquement, x a pour valeur 2. Sous certains aspects de la méthode, la détermination d'une valeur de quantification (1) à partir du coefficient K inclut L = K*A(QP) = K*Am(QP)* (2A e(QP)). Sous d'autres aspects, la méthode comprend en outre la normalisation comme suit de la valeur de quantification par 2N : Ln = L/2N = K*Am(QP)/2(N-A e(QP). Sous certains aspects, la formulation d'une valeur de quantification passe par l'établissement d'un ensemble de facteurs récursifs de quantification de période P, de sorte que A(QP+P) = A(QP)/x. L'établissement de facteurs récursifs de quantification comprend la formulation de mantisses récursives dans lesquelles Am(QP) = Am(QP mod P), et l'établissement de facteurs récursifs de quantification comprend la formulation de facteurs exponentiels récursifs pour lesquels Ae(QP) = Ae(QP mod P) - QP/P.

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