| 摘要 |
Encoding at least one block of pixels includes the following steps: transforming pixel values in the spatial domain for said block into a plurality of coefficients each having a coefficient type representing the frequency range of the coefficient, determining a set of quantizers each associated with a corresponding coefficient type such that an estimated quality parameter in the spatial domain, expressed as a function of the estimated distortions associated with each quantizer of the set, meets a predetermined criterion while ensuring that the sum of rates each associated with a quantizer of the set is minimised, quantizing at least one coefficient having a given coefficient type into a quantized symbol using the quantizer determined for said given coefficient type and encoding the quantized symbol. |
