US5600374A
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Image encoding/decoding apparatus
Assignee: Canon Inc
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Filing: 1994-09-02
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Granted: 1997-02-04
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Expires: 2014-09-02
Abstract
Abstract An image encoding/decoding apparatus in which on the transmission side, image information is divided into at least two or more signal groups by a frequency band, the plurality of signal groups are individually high efficiency encoded, an error correction code is added to each of the plurality of encoded signal groups. The resultant signal groups are then multiplexed and transmitted. On the reception side, the transmitted multiplexed signal is divided into the signal groups for every frequency band divided on the transmission side, the error correction and the decoding of the high efficient encoded data are executed for every signal group, and the plurality of signal groups after decoding are frequency band synthesized, thereby reproducing the image information. At least two kinds of error correction codes of different error correcting abilities are used as error correction codes which are added to the plurality of signal groups on the transmission side.
Inventors
- 👤 Akihiro Shikakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:47
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/63; H04N19/64; H04N19/645; H04N19/10; H04N19/169; H04N19/1883; H04N19/61; H04N19/102; H04N19/115; H04N19/134; H04N19/146; H04N19/65; H04N19/85; H04N19/89
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
An image encoding apparatus comprising: a) input means for inputting an image signal; b) dividing means for dividing the image signal input by said input means into signal groups of a plurality of frequency bands; c) encoding means for encoding the plurality of signal groups divided by said dividing means; and d) adding means for adding error correction check codes weighted in accordance with the frequency band to the image signal encoded by said encoding means.
Claim 2
Dependent Claim
76 words
An image encoding apparatus comprising: a) input means for inputting an image signal; b) dividing means for dividing the image signal input by said input means into signal groups of a plurality of frequency bands; c) encoding means for encoding the plurality of signal groups divided by said dividing means; and d) adding means for adding error correction check codes weighted in accordance with the frequency band to the image signal encoded by said encoding means.
Claim 3
Dependent Claim
65 words
An apparatus according to claim 1, wherein as an error correction check code to be added to the signal of a low frequency band among the signal groups divided every frequency band, said adding means adds the error correction check code of a correcting ability higher than that of the error correction check code that is added to the signal of a high frequency band.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1, wherein said encoding means executes a block encoding using an orthogonal transformation.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 1, further having multiplexing means for multiplexing said plurality of encoded signal groups.
Claim 6
Dependent Claim
21 words
An apparatus according to claim 1, wherein said encoding means executes a compression encoding weighted in accordance with the frequency band.
Claim 7
Dependent Claim
45 words
An apparatus according to claim 4, wherein, in said encoding means, a compression ratio for the signal of a low frequency band among the signal groups divided every frequency band is set to be smaller than that for the signal of a high frequency band.
Claim 8
Dependent Claim
112 words
An image decoding apparatus comprising: a) input means for inputting a plurality of encoded image signal groups, the plurality encoded image signal groups being formed by dividing an image signal into a plurality of signal groups of a plurality of frequency bands, encoding the plurality of divided signal groups and adding error correction check codes weighted according to the frequency bands to the plurality of encoded signal groups; b) error code correcting means for correcting error codes of the plurality of encoded image signal groups by using the error correction check codes; and c) decoding means for decoding the plurality of encoded image signal groups processed by said error code correcting means.
Claim 9
Dependent Claim
112 words
An image decoding apparatus comprising: a) input means for inputting a plurality of encoded image signal groups, the plurality encoded image signal groups being formed by dividing an image signal into a plurality of signal groups of a plurality of frequency bands, encoding the plurality of divided signal groups and adding error correction check codes weighted according to the frequency bands to the plurality of encoded signal groups; b) error code correcting means for correcting error codes of the plurality of encoded image signal groups by using the error correction check codes; and c) decoding means for decoding the plurality of encoded image signal groups processed by said error code correcting means.
Claim 10
Dependent Claim
52 words
An apparatus according to claim 7, wherein an error correction check code added to the signal of a low frequency band among the image signal groups divided every frequency band has a correcting ability higher than that of the error correction check code added to the signal of a high frequency band.
Claim 11
Dependent Claim
116 words
An image encoding/decoding apparatus comprising: a) input means for inputting an image signal; b) dividing means for dividing the image signal input by said input means into signal groups of a plurality of frequency bands; c) encoding means for encoding the plurality of signal groups divided by said dividing means; d) adding means for adding error correction check codes weighted in accordance with the frequency band; e) error code correcting means for correcting error codes in the encoded data of the plurality of encoded signal groups by using the error correction check codes; and f) decoding means for decoding the encoded data of the plurality of encoded signal groups processed by said error code correcting means.
Claim 12
Dependent Claim
116 words
An image encoding/decoding apparatus comprising: a) input means for inputting an image signal; b) dividing means for dividing the image signal input by said input means into signal groups of a plurality of frequency bands; c) encoding means for encoding the plurality of signal groups divided by said dividing means; d) adding means for adding error correction check codes weighted in accordance with the frequency band; e) error code correcting means for correcting error codes in the encoded data of the plurality of encoded signal groups by using the error correction check codes; and f) decoding means for decoding the encoded data of the plurality of encoded signal groups processed by said error code correcting means.
Claim 13
Dependent Claim
65 words
An apparatus according to claim 9, wherein as an error correction check code to be added to the signal of a low frequency band among the signal groups divided every frequency bands, said adding means adds the error correction check code of a correcting ability higher than that of the error correction check code which is added to the signal of a high frequency band.
Claim 14
Dependent Claim
18 words
An apparatus according to claim 9, wherein said encoding means executes a block encoding using an orthogonal transformation.
Claim 15
Dependent Claim
41 words
An apparatus according to claim 9, further having: multiplexing means for multiplexing the encoded data of the plurality of signal groups encoded by said encoding means; and dividing means for dividing the multiplexed encoded data into the plurality of signal groups.
Claim 16
Dependent Claim
21 words
An apparatus according to claim 9, wherein said encoding means executes a compression encoding weighted in accordance with the frequency band.
Claim 17
Dependent Claim
45 words
An apparatus according to claim 12, wherein a compression ratio for the signal of a low frequency band among the signal groups divided every frequency band in said encoding means is set to be smaller than that for the signal of a high frequency band.
References Cited (Backward Citations)
US5353059A
Cited
US5491523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |