| 摘要 |
<p>An error compensator for use in an image decoding system compensates a DC transform coefficient entailing a quantization error. The error compensator comprises an estimation unit for producing an estimate for a selected DC transform coefficient. The estimate is compared with a first and second values wherein the first value represents the difference value defined by subtracting a threshold value, i.e., a maximum quantization error from the DC transform coefficient and the second value represents the summation value defined by adding the maximum error to the DC transform coefficient and the threshold. If a first condition that the estimate be greater than or equal to the first value but smaller than a second value is satisfied, the estimate is selected. However, if the first condition is not satisfied, it is determined whether a second condition that the estimate be smaller than the first value is satisfied. When the second condition is not satisfied, the first value is selected; and otherwise, the second value is selected. <IMAGE></p> |
