US5023919A
Expired / Lapsed
US
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Apparatus and method for treating encoded image data including correction for encoding/decoding deterioration
Assignee: Canon Inc
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Filing: 1988-01-20
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Granted: 1991-06-11
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Expires: 2008-01-20
Abstract
Abstract A decoding apparatus for decoding encoded image data includes a decoding circuit for decoding encoded image data, a post-processing circuit including e.g., smoothing and edge emphasis circuits for respectively performing smoothing and edge emphasis on the image data decoded by the decoding circuit, and a selector for selecting the smoothing the edge emphasis circuit in accordance with the image data decoded by the decoding circuit. For example, the selector can select between the smoothing and edge emphasis circuit based on whether or not the decoded image data is detected to have suffered deterioration or degradation as a result of the encoding/decoding of it.
Inventors
- 👤 Masafumi Wataya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:35
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/98; H04N1/00; H04N1/40; H04N1/40062; H04N1/409; H04N1/4092; H04N1/41
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
95 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding encoded image data; first correction means for performing a first correction on the image data decoded by said decoding means; second correction means for performing a second correction on the image data decoded by said decoding means, the second correction being performed in parallel with the first correction; and selection means for selecting between using output from said first correction means and using output from said second correction means in accordance with characteristic of the image data decoded by said decoding means.
Claim 2
Dependent Claim
95 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding encoded image data; first correction means for performing a first correction on the image data decoded by said decoding means; second correction means for performing a second correction on the image data decoded by said decoding means, the second correction being performed in parallel with the first correction; and selection means for selecting between using output from said first correction means and using output from said second correction means in accordance with characteristic of the image data decoded by said decoding means.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1, wherein said decoding means decodes image data which has been encoded by an irreversible encoding method.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 1, wherein said decoding means decodes image data which is encoded in units of blocks each having a predetermined size.
Claim 5
Dependent Claim
29 words
An apparatus according to claim 1, wherein said first correction means performs smoothing processing on an image, and said second correction means performs edge emphasis processing on an image.
Claim 6
Dependent Claim
34 words
An apparatus according to claim 1, wherein said selection means detects characteristics of the image data decoded by said decoding means, and performs its selection operation in accordance with a result of such detection.
Claim 7
Dependent Claim
82 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding image data which has been divided into blocks and encoded by blocks; discriminating means for detecting an edge of the image data decoded by said decoding means and for discriminating whether or not deterioration has occurred in the edge as a result of the decoding; and correction means for correcting the edge in a case where the edge has been discriminated by said discriminating means as having suffered deterioration.
Claim 8
Dependent Claim
82 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding image data which has been divided into blocks and encoded by blocks; discriminating means for detecting an edge of the image data decoded by said decoding means and for discriminating whether or not deterioration has occurred in the edge as a result of the decoding; and correction means for correcting the edge in a case where the edge has been discriminated by said discriminating means as having suffered deterioration.
Claim 9
Dependent Claim
36 words
A decoding apparatus according to claim 6, wherein said discriminating means is arranged for performing its discrimination on both the edge of an original image and an apparent edge resulting from deterioration of a halftone image.
Claim 10
Dependent Claim
25 words
A decoding apparatus according to claim 7, wherein said discriminating means includes a plurality of detection means each for detecting edges of mutually different frequencies.
Claim 11
Dependent Claim
23 words
A decoding apparatus according to claim 7, wherein said decoding means decodes image data which has been encoded by an irreversible encoding method.
Claim 12
Dependent Claim
20 words
A decoding apparatus according to claim 7, wherein said correction means performs one of smoothing processing and edge emphasis processing.
Claim 13
Dependent Claim
17 words
A decoding apparatus according to claim 7, wherein said detection means detects a relationship between adjacent pixels.
Claim 14
Dependent Claim
81 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding encoded image data; detection means for detecting characteristics of the image data decoded by said decoding means, an output from said decoding means being supplied to said detection means; and correction means for correcting deterioration of the image data decoded by said decoding means, in accordance with a result of detection performed by said detection means, the output from said decoding means being supplied to said correction means.
Claim 15
Dependent Claim
81 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding encoded image data; detection means for detecting characteristics of the image data decoded by said decoding means, an output from said decoding means being supplied to said detection means; and correction means for correcting deterioration of the image data decoded by said decoding means, in accordance with a result of detection performed by said detection means, the output from said decoding means being supplied to said correction means.
Claim 16
Dependent Claim
22 words
A decoding apparatus according to claim 12, wherein said detection means and said correction means are arranged to be electrically in parallel.
Claim 17
Dependent Claim
23 words
A decoding apparatus according to claim 12, wherein said decoding means decodes image data which has been encoded by an irreversible encoding method.
Claim 18
Dependent Claim
26 words
A decoding apparatus according to claim 12, wherein said decoding means decodes image data which is encoded in units of blocks each having a predetermined size.
Claim 19
Dependent Claim
20 words
A decoding apparatus according to claim 12, wherein said correction means performs one of smoothing processing and edge emphasis processing.
Claim 20
Dependent Claim
17 words
A decoding apparatus according to claim 12, wherein said detecting means detects a relationship between adjacent pixels.
Claim 21
Independent Claim
60 words
A method of processing encoded image data, comprising the steps of: decoding encoded image data; taking in the image data decoded in said decoding step and detecting the contents of an image represented by the image data; and correcting deterioration of the image data decoded in said decoding step in accordance with a detection result obtained in said detecting step.
Claim 22
Independent Claim
60 words
A method of processing encoded image data, comprising the steps of: decoding encoded image data; taking in the image data decoded in said decoding step and detecting the contents of an image represented by the image data; and correcting deterioration of the image data decoded in said decoding step in accordance with a detection result obtained in said detecting step.
Claim 23
Dependent Claim
29 words
A method according to claim 18, further comprising the step of changing correction processing in said correcting step in accordance with a detection result obtained in said detecting step.
Claim 24
Dependent Claim
20 words
A method according to claim 18, wherein said correcting step further includes one of smoothing processing and edge emphasis processing.
Claim 25
Dependent Claim
21 words
A method according to claim 18, wherein, in said decoding step, image data encoded by an irreversible encoding method is detected.
Claim 26
Dependent Claim
27 words
A method according to claim 18, wherein, in said decoding step, image data which is encoded in units of blocks, each having a predetermined size, is decoded.
Claim 27
Dependent Claim
18 words
A method according to claim 18, wherein, in said detecting step, a relationship between adjacent pixels is detected.
Claim 28
Dependent Claim
80 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding image data encoded block by block; detecting means for detecting image contents represented by the image data included in a predetermined size of block, from among the image data decoded by said decoding means, using the image data included in that block; and correction means for correcting deterioration of the image data included in that block in accordance with a detection result obtained by said detecting means.
Claim 29
Dependent Claim
80 words
A decoding apparatus for decoding encoded image data, comprising: decoding means for decoding image data encoded block by block; detecting means for detecting image contents represented by the image data included in a predetermined size of block, from among the image data decoded by said decoding means, using the image data included in that block; and correction means for correcting deterioration of the image data included in that block in accordance with a detection result obtained by said detecting means.
Claim 30
Dependent Claim
23 words
A decoding apparatus according to claim 24, wherein said decoding means decodes image data which has been encoded by an irreversible encoding method.
Claim 31
Dependent Claim
26 words
A decoding apparatus according to claim 24, wherein said decoding means decodes image data which is encoded in units of blocks each having a predetermined size.
Claim 32
Dependent Claim
20 words
A decoding apparatus according to claim 24, wherein said correction means performs one of smoothing processing and edge emphasis processing.
Claim 33
Dependent Claim
17 words
A decoding apparatus according to claim 24, wherein said detection means detects a relationship between adjacent pixels.
References Cited (Backward Citations)
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