US5434567A
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Encoding image signals by further transforming transformed DC signals
Assignee: Toshiba Corp
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Filing: 1994-09-09
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Granted: 1995-07-18
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Expires: 2014-09-09
Abstract
Abstract An image is divided into a plurality of blocks and a first transform is applied to each of the blocks to generate a plurality of first transformed blocks, wherein each of the first transformed blocks comprises a DC first transformed signal and a plurality of AC first transformed signals. A second transform is applied to the DC first transformed signals for all of the first transformed blocks to generate a plurality of second transformed signals. The second transformed signals are encoded and then the AC first transformed signals are encoded.
Inventors
- 👤 Walter Mack
- 👤 Al Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:31
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/134; H04N19/146; H04N19/152; H04N19/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
178 words
A computer-implemented process for encoding image signals, comprising the steps of: (a) dividing an image into a plurality of blocks; (b) applying a first transform to each of the blocks to generate a plurality of first transformed blocks, wherein each of the first transformed blocks comprises a DC signal and a plurality of AC signals; (c) applying a second transform to the DC signals for all of the first transformed blocks to generate a plurality of second transformed signals; (d) encoding the second transformed signals; and (e) then encoding the AC signals, wherein step (c) comprises the steps of: (1) dividing the DC signals into a plurality of DC blocks, wherein each DC block comprises a plurality of DC signals; and (2) applying the second transform to each DC block to generate the plurality of second transformed signals, wherein: the second transform is a two-dimensional transform; the second transform is applied to each DC block independent of each other DC block; and for each DC block, the number of DC signals equals the number of second transformed signals.
Claim 2
Dependent Claim
178 words
A computer-implemented process for encoding image signals, comprising the steps of: (a) dividing an image into a plurality of blocks; (b) applying a first transform to each of the blocks to generate a plurality of first transformed blocks, wherein each of the first transformed blocks comprises a DC signal and a plurality of AC signals; (c) applying a second transform to the DC signals for all of the first transformed blocks to generate a plurality of second transformed signals; (d) encoding the second transformed signals; and (e) then encoding the AC signals, wherein step (c) comprises the steps of: (1) dividing the DC signals into a plurality of DC blocks, wherein each DC block comprises a plurality of DC signals; and (2) applying the second transform to each DC block to generate the plurality of second transformed signals, wherein: the second transform is a two-dimensional transform; the second transform is applied to each DC block independent of each other DC block; and for each DC block, the number of DC signals equals the number of second transformed signals.
Claim 3
Dependent Claim
14 words
The process of claim 1, wherein the first transform is a discrete cosine transform.
Claim 4
Dependent Claim
13 words
The process of claim 2, wherein the second transform is a lossless transform.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein the second transform is a lossless transform.
Claim 6
Dependent Claim
15 words
The process of claim 1, wherein the first transform is different from the second transform.
Claim 7
Independent Claim
182 words
An apparatus for encoding image signals, comprising: (a) means for dividing an image into a plurality of blocks; (b) means for applying a first transform to each of the blocks to generate a plurality of first transformed blocks, wherein each of the first transformed blocks comprises a DC signal and a plurality of AC signals; (c) means for applying a second transform to the DC signals for all of the first transformed blocks to generate a plurality of second transformed signals; (d) means for encoding the second transformed signals; and (e) means for then encoding the AC first transformed signals, wherein means (c): (1) divides the DC signals into a plurality of DC blocks, wherein each DC block comprises a plurality of DC signals; and (2) applies the second transform to each DC block to generate the plurality of second transformed signals, wherein: the second transform is a two-dimensional transform; the second transform is applied to each DC block independent of each other DC block; and for each DC block, the number of DC signals equals the number of second transformed signals.
Claim 8
Independent Claim
182 words
An apparatus for encoding image signals, comprising: (a) means for dividing an image into a plurality of blocks; (b) means for applying a first transform to each of the blocks to generate a plurality of first transformed blocks, wherein each of the first transformed blocks comprises a DC signal and a plurality of AC signals; (c) means for applying a second transform to the DC signals for all of the first transformed blocks to generate a plurality of second transformed signals; (d) means for encoding the second transformed signals; and (e) means for then encoding the AC first transformed signals, wherein means (c): (1) divides the DC signals into a plurality of DC blocks, wherein each DC block comprises a plurality of DC signals; and (2) applies the second transform to each DC block to generate the plurality of second transformed signals, wherein: the second transform is a two-dimensional transform; the second transform is applied to each DC block independent of each other DC block; and for each DC block, the number of DC signals equals the number of second transformed signals.
Claim 9
Dependent Claim
14 words
The apparatus of claim 6, wherein the first transform is a discrete cosine transform.
Claim 10
Dependent Claim
13 words
The apparatus of claim 7, wherein the second transform is a lossless transform.
Claim 11
Dependent Claim
13 words
The apparatus of claim 6, wherein the second transform is a lossless transform.
Claim 12
Dependent Claim
15 words
The apparatus of claim 6, wherein the first transform is different from the second transform.
Claim 13
Dependent Claim
24 words
The apparatus of claim 6, wherein the apparatus is electrically connected to a bus and the bus is electrically connected to a memory device.
References Cited (Backward Citations)
US5157488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |