Method for reduced bit-depth quantization

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

H - Electricity

03

M

H03M 7/30 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/50 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2454626

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 (L) from the coefficient K using a mantissa portion (Am(QP)) and an exponential portion (xAe(QP)). Typically, the value of x is 2. In some aspects of the method, forming a quantization value (L) from the coefficient K includes L = K*A(QP) = K*Am(QP)* (2Ae(QP)). In other aspects, the method further comprises: normalizing the quantization value by 2N as follows: Ln = L/2N = K*Am(QP)/2(N-Ae(QP)). 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.

L'invention concerne un procédé pour la quantification d'un coefficient. Ledit procédé consiste à : fournir un coefficient K ; fournir un paramètre de quantification (QP) ; former une valeur de quantification (L) à partir du coefficient K au moyen d'une partie mantisse (Am(QP)) et d'une partie exponentielle (x?Ae(QP)¿). Généralement, la valeur de x est 2. Selon certains aspects du procédé, la formation d'une valeur de quantification (L) à partir du coefficient K inclut L=K*A(QP)=K*Am(QP)*(2?Ae/QP)¿). Selon d'autres aspects, le procédé consiste également à : normaliser la valeur de quantification par 2?N ¿comme suit : Ln=L/2N = K*Am(QP)/2?(n-Ae(QP)¿). Selon certains aspects, la formation d'une valeur de quantification consiste à former un ensemble de facteurs de quantification récursifs avec une période P, A(QP+P)=A(QP)/x. La formation de facteurs de quantification récursifs consiste à former des facteurs de mantisse récursifs, où Am(QP)=Am(QP mod P), et à former des facteurs de quantification récursifs qui consistent à former des facteurs exponentiels récursifs, où Ae(QP)=Ae(QP mod P)-QP/P.? ¿

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