| 摘要 |
In an image encoding device operable to an input image signal to encode the input image signal into an output encoded signal, the image encoding device comprises an decomposing arrangement responsive to the input image signal for decomposing the input image signal into a plurality of frequency subbands each of which includes a plurality of sample points. The frequency subbands are classified into lower frequency subbands and higher frequency subbands. The sample points in the frequency subbands are divided into a plurality of subsets of sample points. The sample points in each of the subsets represent the same domain on the input image signal. Connected to the decomposing arrangement, an encoding arrangement encodes the sample points subset by subset in consideration of correlation between the frequency subbands to produce the output encoded signal. When a particular sample point in the lower frequency subband indicates zero, the encoding arrangement carries out no encoding operation on subordinate sample points in the higher frequency band related to the particular sample point in the lower frequency band. The encoding arrangement may encode the sample points frequency subband by frequency subband in consideration of correlation between the frequency subbands.
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