Signal encoding and decoding system and method
DCFirst Claim
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1. A video signal compression system, comprising:
- a scanner which is operative to simultaneously scan a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
a scanning pattern selector operative to select from the plurality of sets of reordered coefficients a set of reordered coefficients which produces the most efficient coding according to a predetermined criterion and to produce a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients; and
an entropy coder operative to entropy encode the selected set of reordered coefficients and output an entropy encoded signal.
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Abstract
A multi-scanner scans a signal according to several different patterns. A scanning pattern selector determines which scanning pattern produced the most efficient coding result, for example, for runlength coding, and outputs a coded signal, coded most efficiently, and a selection signal which identifies the scanning pattern found to be most efficient.
61 Citations
93 Claims
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1. A video signal compression system, comprising:
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a scanner which is operative to simultaneously scan a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
a scanning pattern selector operative to select from the plurality of sets of reordered coefficients a set of reordered coefficients which produces the most efficient coding according to a predetermined criterion and to produce a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients; and
an entropy coder operative to entropy encode the selected set of reordered coefficients and output an entropy encoded signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 39, 40)
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9. A video signal compression system, comprising:
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means for simultaneously scanning a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
means for selecting a scanning pattern from the plurality of sets of reordered coefficients which produces a set of reordered coefficients having the most efficient coding according to a predetermined criterion and for outputting a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients; and
means for entropy encoding the selected set of reordered coefficients and for outputting an entropy encoded signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A decoder for decompressing a compressed video signal, the compressed video signal containing entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block which have been scanned using a selected one of a plurality of different scanning patterns to produce a set of reordered coefficients, and also containing a pattern signal indicating the selected one of the plurality of different scanning patterns, wherein the selected scanning pattern produces the most efficient coding according to a predetermined criterion, the decoder comprising:
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an entropy decoder operative to decode the entropy encoded data and to output entropy decoded data; and
a scanner operative to scan the entropy decoded data according to the one selected pattern of the plurality of different scanning patterns as indicated by the pattern signal.
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18. A decoder for decoding a coded data signal containing a compressed video signal and a pattern signal, the decoder comprising:
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an entropy decoder to which is applied the compressed video signal, the compressed video signal including entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block which have been scanned using a specific pattern selected from a plurality of different scanning patterns to produce a set of reordered coefficients, wherein the specific scanning pattern produces the most efficient coding according to a predetermined criterion, said entropy decoder being operative to entropy decode the entropy encoded data and to output entropy decoded data; and
a scanner operative to scan the entropy decoded data responsive to the pattern signal, and to output scanned data, wherein the pattern signal indicates the specific scanning pattern. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A decoder, comprising:
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decoding means to which is applied a coded data signal including a compressed video signal, the compressed video signal including entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block which have been scanned using a selected one of a plurality of different scanning patterns to produce a set of reordered coefficients and, the coded data signal also including a pattern signal indicating the selected one of the plurality of different scanning patterns, wherein the selected scanning pattern produces the most efficient coding according to a predetermined criterion, said decoding means for entropy decoding the entropy encoded data and for outputting entropy decoded data; and
scanning means for scanning the entropy decoded data according to the selected pattern indicated by the pattern signal. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A decoding apparatus for decoding a coded data signal which includes entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block, the set of video spatial frequency coefficients having been reordered from an original order according to a scanning pattern selected from a plurality of scanning patterns, the coded data signal also including a pattern signal indicating the selected scanning pattern, the decoding apparatus comprising:
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an entropy decoder which entropy decodes the entropy encoded data to produce entropy decoded data; and
a scanning unit which receives the entropy decoded data and returns the set of video spatial frequency coefficients of an individual sub-block to the original order according to the selected scanning pattern indicated in the pattern signal. - View Dependent Claims (34, 35, 36, 37, 38)
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41. A method of compressing a video signal, comprising:
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simultaneously scanning a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
selecting a scanning pattern from the plurality of sets of reordered coefficients which produces a set of reordered coefficients having the most efficient coding according to a predetermined criterion and outputting a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients; and
entropy encoding the selected set of reordered coefficients and outputting an entropy encoded signal. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. A method of decoding a compressed video signal, comprising:
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receiving a coded data signal, the coded data signal including a compressed video signal having entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block which have been scanned using a selected one of a plurality of different scanning patterns to produce a set of reordered coefficients, the coded data signal also including a pattern signal indicating the selected one of the plurality of different scanning patterns, wherein the selected scanning pattern produces the most efficient coding according to a predetermined criterion;
entropy decoding the entropy encoded data and outputting entropy decoded data; and
scanning the entropy decoded data according to the selected pattern indicated by the pattern signal and outputting scanned data. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55)
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56. A method of decoding a coded data signal which includes entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block, the set of video spatial frequency coefficients having been reordered from an original order according to a scanning pattern selected from a plurality of scanning patterns, the coded data signal also including a pattern signal indicating the selected scanning pattern, the method comprising:
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entropy decoding the entropy encoded data to produce entropy decoded data; and
scanning the entropy decoded data and returning the set of video spatial frequency coefficients of an individual sub-block to the original order according to the selected scanning pattern indicated in the pattern signal. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63)
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64. A video signal compression system, comprising:
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a multi-scanner which is operative to simultaneously scan a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
a scanning pattern selector operative to select from the plurality of sets of reordered coefficients a set of reordered coefficients which produces the most efficient coding according to a predetermined criterion and to produce a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients;
an entropy coder operative to entropy encode the selected set of reordered coefficients and to output entropy encoded data;
an entropy decoder operative to decode the entropy encoded data and to output entropy decoded data; and
a scanner which is operative to scan the entropy decoded data according to the scanning pattern corresponding to the selected set of reordered coefficients as indicated by the pattern signal and to output scanned data. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73)
a combiner which combines additional information with the entropy encoded data and the pattern signal to produce a combined signal; and
a unit which receives the combined signal, extracts the additional information therefrom, and transmits the entropy encoded data to said entropy decoder and the pattern signal to said scanner.
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66. The video signal compression system according to claim 65, wherein said combiner is a multiplexer and said unit which receives the combined signal is a demultiplexer.
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67. The video signal compression system according to claim 65, wherein the additional information is teletext information.
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68. The video signal compression system according to claim 64, wherein said multi-scanner produces the plurality of sets of reordered coefficients according to a runlength coding regime.
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69. The video signal compression system according to claim 64, further comprising a discrete cosine transformer for use in generating the set of video spatial frequency coefficients.
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70. The video signal compression system according to claim 64, wherein said entropy encoder is a variable length coder.
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71. The video signal compression system according to claim 64, wherein the scanner scans the entropy decoded data according to a runlength decoding regime.
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72. The video signal compression system according to claim 64, further comprising a dequantizer which dequantizes the scanned data output by said scanner and outputs dequantized data.
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73. The video signal compression method according to claim 72, further comprising an inverse discrete cosine transformer which inverse discrete cosine transforms the dequantized data output by said dequantizer.
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74. A video signal compression system, comprising:
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multi-scanning means for simultaneously scanning a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
scanning pattern selecting means for selecting from the plurality of sets of reordered coefficients a set of reordered coefficients which produces the most efficient coding according to a predetermined criterion and for producing a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients;
entropy coding means for entropy encoding the selected set of reordered coefficients and outputting entropy encoded data;
entropy decoding means for decoding the entropy encoded data and outputting entropy decoded data; and
scanning means for scanning the entropy decoded data according to the scanning pattern corresponding to the selected set of reordered coefficients as indicated by the pattern signal and outputing scanned data. - View Dependent Claims (75, 76, 77, 78, 79, 80, 81, 82, 83, 85, 86, 87)
combining means for combining additional information with the entropy encoded data and the pattern signal to produce a combined signal; and
de-coupling means for receiving the combined signal, extracting the additional information therefrom, and transmitting the entropy encoded data to said entropy decoding means and the pattern signal to said scanning means.
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76. The video signal compression system according to claim 75, wherein said combining means is a multiplexer and said de-coupling means is a demultiplexer.
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77. The video signal compression system according to claim 75, wherein the additional information is teletext information.
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78. The video signal compression system according to claim 74, wherein said multi-scanning means produces the plurality of sets of reordered coefficients according to a runlength coding regime.
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79. The video signal compression system according to claim 74, further comprising a discrete cosine transforming means for use in generating the set of video spatial frequency coefficients.
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80. The video signal compression system according to claim 74, wherein said entropy encoding means is a variable length coder.
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81. The video signal compression system according to claim 74, wherein said scanning means scans the entropy decoded data according to a runlength decoding regime.
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82. The video signal compression system according to claim 74, further comprising dequantizing means for dequantizing the scanned data output by said scanning means and outputting dequantized data.
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83. The video signal compression system according to claim 81, further comprising inverse discrete cosine transforming means for inverse discrete cosine transforming the dequantized data output by said dequantizing means.
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85. The video signal compression method according to claim 83, further comprising steps of:
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combining additional information with the entropy encoded data and the pattern signal to produce a combined signal; and
receiving the combined signal and extracting the additional information therefrom, the entropy encoded data therefrom for use in the decoding step, and the pattern signal therefrom for use in the step of scanning the entropy decoded data.
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86. The video signal compression method according to claim 85, wherein said combining step multiplexes the additional information with the entropy encoded data and the pattern signal to produce the combined signal and said extracting step de-multiplexes the additional information, the entropy encoded data, and the pattern signal.
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87. The video signal compression method according to claim 85, wherein the additional information is teletext information.
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84. A video signal compression method, comprising:
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simultaneously scanning a set of video spatial frequency coefficients of an individual sub-block according to a plurality of different scanning patterns to produce a plurality of sets of reordered coefficients;
selecting from the plurality of sets of reordered coefficients a set of reordered coefficients which produces the most efficient coding according to a predetermined criterion and producing a pattern signal indicating the scanning pattern corresponding to the selected set of reordered coefficients;
entropy encoding the selected set of reordered coefficients and outputting entropy encoded data;
decoding the entropy encoded data and outputting entropy decoded data; and
scanning the entropy decoded data according to the scanning pattern corresponding to the selected set of reordered coefficients as indicated by the pattern signal and outputting scanned data. - View Dependent Claims (88, 89, 90, 91, 92, 93)
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Specification