EP0497545A2
Expired / Lapsed
EP
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Image signal coding device
Assignee: Canon Inc
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Filing: 1992-01-28
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Granted: —
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Expires: 2012-01-28
Abstract
Abstract When forming a data block which includes both an image code obtained by carrying out variable length coding for each of plural regions resulted from dividing each picture provided by an image signal, and added information associated therewith, boundary information indicative of a position, in the data block, of the boundary between the image codes in adjacent twos of the divided regions is added into the data block. There are also formed in the data block a first error detection or correction code to make up a code word which includes the boundary code, but does not include the image code, and a second error detection or correction code to make up a code word which includes both the image code and the boundary code. Alternatively, in the block which includes main information and added information associated with the main information in time series there are formed a first error detection or correction code to make up a code word which does not include the main information, but includes both the added information and a first check bit, and a second error detection or correction code to make up a code word which does not include the first check bit, but includes the added information, the main information and a second check bit.
Inventors
- 👤 Kenichi c/o Canon Kabushiki Kaisha Nagasawa
- 👤 Akihiro C/O Canon Kabushiki Kaisha Shikakura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:32
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1833; H; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/15; H03M13/151; H03M13/1515; H03M13/29; H03M13/2906; H03M13/2909; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/60; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N19/65
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
An image signal coding device, comprising: (a) coding means for carrying out variable length coding for each of plural regions resulted from dividing each picture provided by an image signal, and outputting image codes; (b) block forming means for forming a data block which includes said image codes; (c) boundary forming means for forming boundary information indicative of a position, in said data block, of the boundary between the image codes in adjacent twos of said divided regions, said boundary information being added into said data block; and (d) error detection or correction coding means for forming, in said data block, a first error detection or correction code to make up a code word which includes said boundary code, but does not include said image code, and a second error detection or correction code to make up a code word which includes both said image code and said boundary code.
Claim 2
Dependent Claim
35 words
A device according to claim 1, wherein the image code in each said data block comprises a plurality of hutches, and said boundary information indicates the position in said data block in units of hutch.
Claim 3
Dependent Claim
63 words
A device according to claim 2, wherein said block forming means adds indefinite bits to one of the hutches belonging to each region so that the image code in each region becomes an integer time the capacity of each hutch for containing the image code, and said boundary information indicates the position of said hutch, including said indefinite bits, in said data block.
Claim 4
Dependent Claim
32 words
A device according to claim 1, wherein said first error detection or correction code is an error detection code and said second error detection or correction code is an error correction code.
Claim 5
Dependent Claim
20 words
A device according to claim 4, wherein said first error detection or correction code is a cyclic redundancy check code.
Claim 6
Dependent Claim
34 words
A device according to claim 1, wherein the code word covered by said second error detection or correction code is arranged not including a check bit for said first error detection or correction code.
Claim 7
Dependent Claim
33 words
A device according to claim 1, wherein the code word covered by said second error detection or correction code is arranged including a check bit for said first error detection or correction code.
Claim 8
Dependent Claim
113 words
An error detection and/or correction code coding device, comprising: (a) block forming means for forming a data block which includes main information and added information associated with said main information in time series; (b) first means for forming, in said data block, a first error detection or correction code to make up a code word which does not include said main information, but includes both said added information and a first check bit; and (c) second means for forming a second error detection or correction code to make up a code word which does not include said first check bit, but includes said added information, said main information and a second check bit.
Claim 9
Dependent Claim
32 words
A device according to claim 8, wherein said first error detection or correction code is an error detection code and said second error detection or correction code is an error correction code.
Claim 10
Dependent Claim
20 words
A device according to claim 9, wherein said first error detection or correction code is a cyclic redundancy check code.
Claim 11
Dependent Claim
86 words
An error detection and/or correction code coding device, comprising: (a) first error detection or correction coding means for adding a first check bit to first information in a data group, containing said first information and second information in time series, to thereby make up a code word; and (b) second error detection or correction coding means for adding a second check bit to said first information and second information in said data group, to thereby make up a code word not including said first check bit.
Claim 12
Dependent Claim
61 words
An image signal coding device which divides image data into regions and compresses the image data for each region, the device generating output data comprising said compressed image data, region data relating to the division of the image data into regions, and error detection and/or correction code data which error detection and/or correction codes for at least the said region data.
Claim 13
Dependent Claim
71 words
An error detection and/or correction device which outputs first data, second data, a first error detection and/or correction code and a second error detection and/or correction code, the first code coding for errors in the first data but not for errors in the second data and the second code coding for errors in the first data and for errors in the second data but not for errors in the first code.
Claim 14
Dependent Claim
17 words
A coded data signal as generated by a device according to any one of the preceding claims.
Claim 15
Independent Claim
18 words
A device for decoding data output by a device according to any one of claims 1 to 13.
References Cited (Backward Citations)
No citation records indexed.
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