| 摘要 |
An apparatus is provided for dequantization and inverse transformation of an image signal. The apparatus comprises a first receiver for receiving a plurality of quantized coefficient levels that define an image, a second receiver for receiving a quantization paramater QP, a first processor for determining a periodic mantissa portion depending on QP%P and P defines the period of the mantissa portion, a second processor for determining an exponential portion depending on QP/P, a third processor for computing reconstructed transform coefficients from the plurality of quantized coefficient levels, the periodic mantissa portion and the exponential portion, a fourth processor for performing an inverse transformation on the reconstructed transform coefficients thereby yielding scaled samples and a fifth processor for computing reconstructed samples, by normalizing the scaled samples using a constant normalization factor. |
