EP0357388A2
Expired / Lapsed
EP
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Image encoding method
Assignee: Canon Inc
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract In an image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of coincidence/noncoincidence between the predicted pixel and the pixel of interest, a parameter for predicting a pixel is changed on the basis of a rate of coincidence/noncoincidence of the predicted pixel and the pixel of interest.
Inventors
- 👤 Shigeo Kato
- 👤 Yasuhiko Yasuda
- 👤 Hidefumi Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:06
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/004; H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/4172
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
An image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of coincidence/noncoincidence between the predicted pixel and the pixel of interest, wherein a parameter for predicting a pixel is changed on the basis of a rate of coincidence/noncoincidence of the predicted pixel and the pixel of interest.
Claim 2
Dependent Claim
71 words
An image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of coincidence/noncoincidence between the predicted pixel and the pixel of interest, wherein a parameter for predicting a pixel is changed on the basis of a rate of coincidence/noncoincidence of the predicted pixel and the pixel of interest.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein an image is encoded by arithmetic coding.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein the parameter is a probability of occurrence of the predicted pixel.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein the parameter is a value of a pixel which has a high probability of occurence.
Claim 6
Dependent Claim
82 words
An image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of coincidence/noncoincidence between the predicted pixel and the pixel of interest, wherein a plurality of pixel patterns to be referred are classified into a plurality of groups on the basis of a generation frequency and similarity of patterns, and encoding is performed in units of the classified groups.
Claim 7
Dependent Claim
82 words
An image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of coincidence/noncoincidence between the predicted pixel and the pixel of interest, wherein a plurality of pixel patterns to be referred are classified into a plurality of groups on the basis of a generation frequency and similarity of patterns, and encoding is performed in units of the classified groups.
Claim 8
Dependent Claim
14 words
A method according to claim 5, wherein an image is encoded by arithmetic coding.
Claim 9
Dependent Claim
21 words
A method according to claim 5, wherein a parameter for predicting a pixel is varied in units of the classified groups.
Claim 10
Dependent Claim
18 words
A method according to claim 7, wherein the parameter is a probability of occurrence of the predicted pixel.
Claim 11
Dependent Claim
22 words
A method according to claim 7, wherein the parameter is a value of a pixel which has a high probability of occurrence.
Claim 12
Dependent Claim
77 words
An image encoding apparatus comprising: smoothing means for smoothing a binary image to be encoded; binary-encoding means for binary-encoding the image smoothed by said smoothing means; sampling means for sub-sampling the image binary-encoded by said binary-encoding means; and encoding means for encoding the binary image sub-sampled by said sampling means, wherein a degree of smoothness of an image by said smoothing means and a threshold value for a binary-encoding operation of said binary-encoding means can be varied.
Claim 13
Dependent Claim
77 words
An image encoding apparatus comprising: smoothing means for smoothing a binary image to be encoded; binary-encoding means for binary-encoding the image smoothed by said smoothing means; sampling means for sub-sampling the image binary-encoded by said binary-encoding means; and encoding means for encoding the binary image sub-sampled by said sampling means, wherein a degree of smoothness of an image by said smoothing means and a threshold value for a binary-encoding operation of said binary-encoding means can be varied.
References Cited (Backward Citations)
No citation records indexed.
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