US4953019A
Expired / Lapsed
US
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Image signal encoding apparatus
Assignee: Canon Inc
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Filing: 1989-11-22
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Granted: 1990-08-28
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Expires: 2009-11-22
Abstract
Abstract An image signal encoding apparatus for encoding an image signal in which image of one picture plane consisting of a plurality of pixel data are divided into a plurality of blocks each consisting of a predetermined number of pixel data. For each of the blocks, a pair of reference value data regarding the maximum and minimum values of the levels of the pixel data constructing the block are formed. On the basis of the formed reference value data, encoded date is formed by encoding each of the pixel data of the block. Decoded data is formed by decoding the encoded data formed on the basis of the reference value data. By comparing each of the pixel data of the block with the decoded data, errors are detected. The reference value data are corrected in accordance with the result of the detection. Thus, the encoding errors are reduced and it is possible to perform the encoding with less deterioration in picture quality of the image signal.
Inventors
- 👤 Akihiro Skikakura
- 👤 Yasuyuki Tanaka
- 👤 Makoto Shimokoriyama
- 👤 Yoshiki Ishii
- 👤 Tetsuya Shimizu
- 👤 Shinichi Yamashita
- 👤 Akio Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/98
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
228 words
An image signal encoding apparatus for encoding an image signal comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of image data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) encoding means for encoding each of the pixel data of the block on the basis of the reference value data which are formed by said reference value data forming means for every block, for forming encoded data, and for outputting the encoded data; (D) decoding means for decoding the encoded data formed by said encoding means on the basis of the reference value data formed by the reference value data forming means and for forming decoded data; (E) error detecting means for comparing the pixel data output from said blocking means for every block with the decoded data formed by said decoding means and for detecting errors; and (F) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data.
Claim 2
Dependent Claim
228 words
An image signal encoding apparatus for encoding an image signal comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of image data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) encoding means for encoding each of the pixel data of the block on the basis of the reference value data which are formed by said reference value data forming means for every block, for forming encoded data, and for outputting the encoded data; (D) decoding means for decoding the encoded data formed by said encoding means on the basis of the reference value data formed by the reference value data forming means and for forming decoded data; (E) error detecting means for comparing the pixel data output from said blocking means for every block with the decoded data formed by said decoding means and for detecting errors; and (F) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data.
Claim 3
Dependent Claim
274 words
An image signal encoding apparatus for encoding an image signal, comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of image data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) shifting data calculating means for shifting the reference value data formed by said reference value data forming means and for calculating a plurality of kinds of different shifting data; (D) a plurality of encoding circuits for encoding each of the pixel data constituting the block on the basis of the reference value data formed by said reference value data forming means and said plurality of kinds of shifting data formed by said shifting data calculating means for every block and for forming a plurality of kinds of encoded data; (E) decoding means for decoding the encoded data formed by said encoding circuits on the basis of the reference value data formed by the reference value data forming means and for forming decoded data; (F) error detecting means for comparing the pixel data output from said blocking means for every block with the decoded data formed by said decoding means and for detecting errors; and (G) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data.
Claim 4
Dependent Claim
274 words
An image signal encoding apparatus for encoding an image signal, comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of image data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) shifting data calculating means for shifting the reference value data formed by said reference value data forming means and for calculating a plurality of kinds of different shifting data; (D) a plurality of encoding circuits for encoding each of the pixel data constituting the block on the basis of the reference value data formed by said reference value data forming means and said plurality of kinds of shifting data formed by said shifting data calculating means for every block and for forming a plurality of kinds of encoded data; (E) decoding means for decoding the encoded data formed by said encoding circuits on the basis of the reference value data formed by the reference value data forming means and for forming decoded data; (F) error detecting means for comparing the pixel data output from said blocking means for every block with the decoded data formed by said decoding means and for detecting errors; and (G) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data.
Claim 5
Dependent Claim
73 words
An apparatus according to claim 2, wherein said decoding means includes a plurality of decoding circuits for decoding said plurality of kinds of encoded data formed by said plurality of encoding circuits on the basis of the reference value data formed by the reference value data forming means and said plurality of kinds of shifting data formed by said shifting data calculating means and for forming a plurality of kinds of decoded data.
Claim 6
Dependent Claim
48 words
An apparatus according to claim 3, wherein said error detecting means includes a plurality of error detecting circuits for comparing the pixel data output for every block from said blocking means with said plurality of decoded data formed by said plurality of decoding circuits and for detecting errors.
Claim 7
Dependent Claim
65 words
An apparatus according to claim 4, wherein said correcting means includes selection output means for selecting either one of said reference value data and said plurality of kinds of shifting data which were formed by said reference value data forming means and said shifting data calculating means in accordance with the results of the detection by said plurality of error detecting circuits and for outputting.
Claim 8
Dependent Claim
46 words
An apparatus according to claim 1, wherein said error detecting means includes an error data calculation circuit for comparing the pixel data which is output for every block from said blocking means with the decoded data formed by said decoding means and for calculating error data.
Claim 9
Dependent Claim
77 words
An apparatus according to claim 6, wherein said correcting means includes: (A) mean error value data calculating means for calculating a mean value of the error data calculated by said error data calculation circuit and for forming mean error value data; and (B) adding means for adding the mean error value data formed by said mean error value data calculating means to the reference value data formed by said reference value data forming means and for outputting.
Claim 10
Dependent Claim
72 words
An apparatus according to claim 1, wherein said error detecting means includes sampling means for sampling and outputting only the pixel data located around the block among the pixel data which are output for every block by said blocking means, and the error detecting means is arranged so as to compare the pixel data sampled by said sampling means with the decoded data formed by said decoding means and to detect errors.
Claim 11
Dependent Claim
61 words
An apparatus according to claim 1, further comprising: (A) correlation detecting means for detecting a correlation between blocks for each of the blocks produced by said blocking means; and (B) correction amount control means for controlling a correcting amount of the reference value data in said correcting means in accordance with the result of the detection by said correlation detecting means.
Claim 12
Dependent Claim
273 words
An image signal encoding apparatus for encoding an image signal comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of pixel data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) first encoding means for encoding each of the pixel data of the block on the basis of the reference value data formed by said reference value data forming means for every block, for forming first encoded data, and for outputting the first encoded data; (D) decoding means for decoding the first encoded data formed by said first encoding means on the basis of the reference value data formed by said reference value data forming means and for forming decoded data; (E) error detecting means for comparing the pixel data output for every block by said blocking means with the decoded data formed by said decoding means and for detecting errors; (F) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data; and (G) second encoding means for encoding each of the pixel data of the block on the basis of the reference value data corrected by said correcting means for every block, for forming second encoded data, and for outputting the second encoded data.
Claim 13
Dependent Claim
273 words
An image signal encoding apparatus for encoding an image signal comprising: (A) blocking means for receiving image signals of one picture plane consisting of a plurality of pixel data and for dividing said image signals into a plurality of blocks each consisting of a predetermined number of pixel data; (B) reference value data forming means for forming a pair of reference value data regarding maximum and minimum values of levels of the pixel data of the block, for each of the blocks; (C) first encoding means for encoding each of the pixel data of the block on the basis of the reference value data formed by said reference value data forming means for every block, for forming first encoded data, and for outputting the first encoded data; (D) decoding means for decoding the first encoded data formed by said first encoding means on the basis of the reference value data formed by said reference value data forming means and for forming decoded data; (E) error detecting means for comparing the pixel data output for every block by said blocking means with the decoded data formed by said decoding means and for detecting errors; (F) correcting means for correcting the reference value data formed by said reference value data forming means in accordance with the result of the detection by said error detecting means and for outputting corrected reference value data; and (G) second encoding means for encoding each of the pixel data of the block on the basis of the reference value data corrected by said correcting means for every block, for forming second encoded data, and for outputting the second encoded data.
Claim 14
Dependent Claim
99 words
An apparatus according to claim 10, wherein said first encoding means includes: (A) digitization level setting means for digitizing a dynamic range indicative of the reference value data formed by said reference value data forming means and for setting a plurality of different digitization levels; and (B) comparing means for comparing the level of each of the pixel data constructing the block with said plurality of digitization levels set by said digitization level setting means and for outputting the first encoded data indicate to which digitization level said pixel data belongs in accordance with the result of the comparison.
Claim 15
Dependent Claim
96 words
An apparatus according to claim 10, wherein said second encoding means includes: (A) digitization level setting means for digitizing the dynamic range indicative of the reference value data corrected by said correcting means and for setting a plurality of different digitization levels; and (B) comparing means for comparing the level of each of the pixel data of the block with said plurality of digitization levels set by said digitization level setting means and for outputting the second encoded data indicate to which digitization level said pixel data belongs in accordance with the result of the comparison.
Claim 16
Dependent Claim
46 words
An apparatus according to claim 10, wherein said error detecting means includes an error data calculation circuit for comparing the pixel data which is output for every block from said blocking means with the decoded data formed by said decoding means and for calculating error data.
Claim 17
Dependent Claim
82 words
An apparatus according to claim 13, wherein said correcting means includes: (A) mean error value data calculating means for calculating a mean value of the error data calculated by said error data calculation circuit and for forming mean error value data; and (B) adding means for adding the mean error value data formed by said mean error value data calculating means to the reference value data formed by said reference value data forming means and for outputting the result of the addition.
Claim 18
Dependent Claim
72 words
An apparatus according to claim 10, wherein said error detecting means includes sampling means for sampling and outputting only the pixel data located around the block among the pixel data which are output for every block by said blocking means, and the error detecting means is arranged so as to compare the pixel data sampled by said sampling means with the decoded data formed by said decoding means and to detect errors.
Claim 19
Dependent Claim
61 words
An apparatus according to claim 10, further comprising: (A) correlation detecting means for detecting a correlation between blocks for each of the blocks produced by said blocking means; and (B) correction amount control means for controlling a correcting amount of the reference value data in said correcting means in accordance with the result of the detection by said correlation detecting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |