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 2737889

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 (I) from the coefficient K using a mantissa portion (Am (QP)) and an exponential portion (x Ae(QP)). Typically, the value of x is 2. In some aspects of the method, forming a quantization value (I) 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.

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