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EP0376679A2
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EP
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Image encoding apparatus and image encoding method
Assignee: Canon Inc
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Filing: 1989-12-27
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Granted: —
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Expires: 2009-12-27
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 the number or positions of reference pixels referred by the encoding unit for encoding between the encoding operations of the first and second images.
Inventors
- 👤 Akihiro Katayama
- 👤 Mitsuru Maeda
- 👤 Yasuji Hirabayashi
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:59
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
61 words
An image encoding apparatus comprising: forming means for forming a second image having a different resolution on the basis of a first image; encoding means for separately encoding the first and second images; and means for changing the number or positions of reference pixels referred by said encoding means for encoding between the encoding operations of the first and second images.
Claim 2
Dependent Claim
61 words
An image encoding apparatus comprising: forming means for forming a second image having a different resolution on the basis of a first image; encoding means for separately encoding the first and second images; and means for changing the number or positions of reference pixels referred by said encoding means for encoding between the encoding operations of the first and second images.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1, wherein said encoding means performs the encoding operation with reference to surrounding pixels of a pixel of interest.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 1, wherein said encoding means performs the encoding operation of the first image with reference to the first and second images.
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
67 words
An image encoding apparatus comprising: forming means for forming a second image having a different resolution on the basis of a first image; encoding means for separately encoding the first and second images; and compensation means for performing linear differential processing of the first image to detect a presence/absence of a fine line to compensate for a forming operation of the second image by said forming means.
Claim 7
Dependent Claim
67 words
An image encoding apparatus comprising: forming means for forming a second image having a different resolution on the basis of a first image; encoding means for separately encoding the first and second images; and compensation means for performing linear differential processing of the first image to detect a presence/absence of a fine line to compensate for a forming operation of the second image by said forming means.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 5, wherein said forming means smooths the first image, binarizes the smoothed image, and sub-samples the binary image to form the second image.
Claim 9
Dependent Claim
31 words
An apparatus according to claim 5, wherein said compensation means detects the presence of the fine line to convert the second image formed by said forming means into a specific image.
Claim 10
Dependent Claim
24 words
An apparatus according to claim 5, wherein said encoding means performs the encoding operation with reference to surrounding pixels of a pixel of interest.
Claim 11
Dependent Claim
58 words
An imaging coding apparatus of the kind which has means for first transmitting a relatively low resolution degraded image and then transmitting further image information to subsequently upgrade the first transmitted image characterised in that prior to the transmission of the first relatively low resolution degraded image there are means for upgrading that image in certain critical areas.
Claim 12
Dependent Claim
58 words
An imaging coding apparatus of the kind which has means for first transmitting a relatively low resolution degraded image and then transmitting further image information to subsequently upgrade the first transmitted image characterised in that prior to the transmission of the first relatively low resolution degraded image there are means for upgrading that image in certain critical areas.
References Cited (Backward Citations)
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