Digital signal coding, decoding and transmission, with decomposition into frequency sub-bands and segmentation
First Claim
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1. A method of coding a set of data representing physical quantities, comprising the steps of:
- decomposing the set of data into a plurality of frequency sub-bands on at least one resolution level, coding the sub-bands, decoding the coded sub-bands, then, for each resolution level, segmenting at least one sub-band into at least two homogeneous regions, in order to form a segmentation map, ordering the regions according to a predetermined criterion, and ordering the coding data of the sub-bands as a function of the order of the regions.
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Abstract
The invention concerns a method of coding a set of data (IM) representing physical quantities, characterized in that it includes the steps of:
decomposing (E20) the set of data into a plurality of frequency sub-bands on at least one resolution level,
then, for each resolution level,
segmenting (E23, E26) at least one sub-band into at least two homogeneous regions, in order to form a segmentation map,
ordering (E30, E33) the regions according to a predetermined criterion,
coding (E21) the sub-bands of the resolution level under consideration,
ordering (E31, E34) the coding data of the sub-bands as a function of the order of the regions.
22 Citations
41 Claims
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1. A method of coding a set of data representing physical quantities, comprising the steps of:
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decomposing the set of data into a plurality of frequency sub-bands on at least one resolution level, coding the sub-bands, decoding the coded sub-bands, then, for each resolution level, segmenting at least one sub-band into at least two homogeneous regions, in order to form a segmentation map, ordering the regions according to a predetermined criterion, and ordering the coding data of the sub-bands as a function of the order of the regions. - View Dependent Claims (2, 3, 4, 5, 6, 16, 36, 37, 40, 41)
analyzing the segmentation in order to classify the regions according to a predetermined criterion, decoding the coding data of the sub-bands of the resolution level under consideration as a function of a result of said analyzing step, reconstructing the sub-bands, and synthesizing the reconstructed sub-bands.
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36. A digital signal processing apparatus comprising means adapted to implement said coding method according to any one of claims 1-3, 7, or 8.
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37. A digital signal processing apparatus comprising means adapted to implement said decoding method according to claim 16.
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40. A storage medium storing a program for implementing a method according to any one of claims 1-3, 7, or 8.
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41. A storage medium according to claim 40, in which said storage medium comprises a floppy disk or a CD-ROM.
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7. A method of coding a set of data representing physical quantities, comprising the steps of:
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decomposing the set of data into a plurality of frequency sub-bands on at least two resolution levels, then, for at least one resolution level, segmenting at least one sub-band of the resolution level under consideration into at least two homogeneous regions, ordering the regions according to a predetermined criterion, coding in the order previously determined by region coefficients of the resolution level under consideration, and, for at least one resolution level, except the highest resolution level, decoding the coded coefficients of the resolution level under consideration, in order to form decoded sub-bands, and synthesising the decoded sub-bands of the resolution level under consideration, on one resolution level, in a synthesised sub-band which will be considered at the following iteration. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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17. A device for coding a set of data representing physical quantities, comprising:
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means of decomposing the set of data into a plurality of frequency sub-bands on at least one resolution level, means of coding the sub-bands, means of decoding the coded sub-bands, means of segmenting, for each resolution level, at least one sub-band into at least two homogeneous regions, in order to form a segmentation map, means of ordering the regions according to a predetermined criterion, and means of ordering the coding data of the sub-bands as a function of the order of the regions. - View Dependent Claims (18, 19, 20, 21, 22, 23, 34, 35, 38, 39)
a microprocessor, a read only memory containing a program for coding the set of data, and a random access memory containing registers adapted to record variables modified during the running of said program.
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34. A device for decoding data representing physical quantities coded by said coding device according to any one of claims 17-19, 24, or 25, comprising:
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means of analyzing the segmentation, for a resolution level under consideration, in order to classify the regions in accordance with a predetermined criterion, means of decoding the coding data of the sub-bands of the resolution level under consideration as a function of the result of said analyzing step, means of reconstructing the sub-bands, and means of synthesizing the reconstructed sub-bands.
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35. The decoding device according to claim 34, in which said the means of analysis, decoding, reconstruction and synthesis are incorporated in:
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a microprocessor, a read only memory containing a program for decoding the data, and a random access memory containing registers adapted to record variables modified during the running of said program.
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38. A digital signal processing apparatus including said coding device according to any one of claims 17-19, 24, or 25.
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39. A digital signal processing apparatus, including said decoding device according to claim 34.
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24. A device for coding a set of data representing physical quantities, comprising:
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means of decomposing the set of data into a plurality of frequency sub-bands on at least two resolution levels, means of segmenting at least one sub-band of at least one resolution level under consideration into at least two homogeneous regions, means of ordering the regions according to a predetermined criterion, means of coding in the order previously determined by region coefficients of the resolution level under consideration, means of decoding the coded coefficients of the resolution level under consideration, except the highest resolution level, in order to form decoded sub-bands, and means of synthesising the decoded sub-bands of the resolution level under consideration, on one resolution level, in a synthesised sub-band which will be supplied to the segmenting means. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
a microprocessor, a read only memory containing a program for processing the data, and a random access memory containing registers adapted to record variables modified during the running of said program.
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Specification