US5371606A
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US
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Image encoding apparatus
Assignee: Canon Inc
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Filing: 1992-11-02
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Granted: 1994-12-06
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Expires: 2012-11-02
Abstract
Abstract An image encoding apparatus has a forming unit for forming a second image having a different resolution on the basis of a first image, an encoding unit for separately encoding the first and second images, and a changing unit for changing, between the encoding operations of the first and second images, the number or positions of reference pixels referred to by the encoding unit for encoding.
Inventors
- 👤 Akihiro Katayama
- 👤 Mitsuru Maeda
- 👤 Yasuji Hirabayashi
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:36
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/4172; H04N1/40; H04N1/40068
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
An image encoding apparatus, comprising: inputting means for inputting a first image having a first resolution; forming means for forming a second image having a second resolution on the basis of the first image, the second resolution being lower than the first resolution; and encoding means for encoding the first and second images of which resolutions are different from each other, respectively, said encoding means encoding a target pixel with reference to reference pixels, wherein said encoding means encodes the first image as an image having the first resolution with reference to a first set of reference pixels and encodes the second image as an image having the second resolution with reference to a second set of reference pixels which are different in position from the first set of reference pixels.
Claim 2
Dependent Claim
131 words
An image encoding apparatus, comprising: inputting means for inputting a first image having a first resolution; forming means for forming a second image having a second resolution on the basis of the first image, the second resolution being lower than the first resolution; and encoding means for encoding the first and second images of which resolutions are different from each other, respectively, said encoding means encoding a target pixel with reference to reference pixels, wherein said encoding means encodes the first image as an image having the first resolution with reference to a first set of reference pixels and encodes the second image as an image having the second resolution with reference to a second set of reference pixels which are different in position from the first set of reference pixels.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1, wherein said encoding means encodes the target pixel with reference to surrounding pixels of the target pixel.
Claim 4
Dependent Claim
23 words
An apparatus according to claim 1, wherein said encoding means predicts a status of the target pixel with reference to the reference pixels.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1, wherein said forming means smooths the first image, binarizes the smoothed image, and sub-samples the binary image to form the second image.
Claim 6
Dependent Claim
48 words
An apparatus according to claim 1, said encoding means comprising: instructing means for instructing a resolution of an image to be encoded; and determining means for determining the positions of reference pixels in accordance with the resolution of the image to be encoded, instructed by said instruction means.
Claim 7
Dependent Claim
122 words
An image encoding method, comprising the steps of: inputting a first image having a first resolution; forming a second image having a second resolution on the basis of the first image, the second resolution being lower that the first resolution; and encoding the first and second images of which resolutions are different from each other, respectively, a target pixel being encoded with reference to reference pixels, wherein the first image as an image having the first resolution is encoded with reference to a first set of reference pixels and the second image as an image having the second resolution is encoded with reference to a second set of reference pixels which are different in positions from the first set of reference pixels.
Claim 8
Dependent Claim
122 words
An image encoding method, comprising the steps of: inputting a first image having a first resolution; forming a second image having a second resolution on the basis of the first image, the second resolution being lower that the first resolution; and encoding the first and second images of which resolutions are different from each other, respectively, a target pixel being encoded with reference to reference pixels, wherein the first image as an image having the first resolution is encoded with reference to a first set of reference pixels and the second image as an image having the second resolution is encoded with reference to a second set of reference pixels which are different in positions from the first set of reference pixels.
Claim 9
Dependent Claim
25 words
A method according to claim 6, wherein, in said encoding step, the target pixel is encoded with reference to surrounding pixels of the target pixel.
Claim 10
Dependent Claim
25 words
A method according to claim 6, wherein, in said encoding step, a status of the target pixel is predicted with reference to the reference pixels.
Claim 11
Dependent Claim
32 words
A method according to claim 6, wherein, in said forming step, the first image is smoothed, the smoothed image is binarized, and the binary image is sub-sampled to form the second image.
Claim 12
Dependent Claim
38 words
A method according to claim 6 comprising the steps of: instructing a resolution of an image to be encoded; and determining the positions of reference pixels in accordance with the instructed resolution of the image to be encoded.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |