Patent US5748788A successfully refreshed from Google Patents.
US5748788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image processing method and apparatus
Assignee: Canon Inc
•
Filing: 1996-08-28
•
Granted: 1998-05-05
•
Expires: 2016-08-28
Abstract
Abstract A noise reduction apparatus in which decoded image data is input to a block division circuit which divides the input image into blocks each consisting of N×N pixels. A process block determination circuit determines the presence/absence of an edge from estimated values of four corner points of an objective block divided by the block division circuit. The process block determination circuit determines the size of a process block in accordance with the determination result. A linear interpolation circuit performs linear interpolation of the process block determined by the process block determination circuit, and outputs corrected image data.
Inventors
- 👤 Takahiro Moro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:27
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
An image processing method comprising the steps of: inputting image data encoded in blocks of a first block size; decoding the input image data so as to obtain decoded image data; detecting an edge in the image data based on the decoded image data; identifying a block of the decoded image data on the basis of a detection result in said detecting step, wherein the block identified in said identifying step has a second block size different from the first block size; and eliminating a block distortion caused by encoding image data in blocks of the first block size, by correcting the decoded image data in the block identified in said identifying step.
Claim 2
Dependent Claim
113 words
An image processing method comprising the steps of: inputting image data encoded in blocks of a first block size; decoding the input image data so as to obtain decoded image data; detecting an edge in the image data based on the decoded image data; identifying a block of the decoded image data on the basis of a detection result in said detecting step, wherein the block identified in said identifying step has a second block size different from the first block size; and eliminating a block distortion caused by encoding image data in blocks of the first block size, by correcting the decoded image data in the block identified in said identifying step.
Claim 3
Dependent Claim
25 words
A method according to claim 1, wherein said image data is obtained by decoding image data coded in units of blocks, each having N×M pixels.
Claim 4
Dependent Claim
18 words
A method according to claim 2, wherein presence of the edge is examined in units of the blocks.
Claim 5
Dependent Claim
24 words
A method according to claim 3, wherein the edge is detected on the basis of estimated values of four corner points of the block.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein the block distortion is generated by a loss of an AC component.
Claim 7
Dependent Claim
12 words
A method according to claim 1, wherein said correction is linear interpolation.
Claim 8
Dependent Claim
125 words
An image processing apparatus comprising: input means for inputting image data encoded in blocks of a first block size; decoding means for decoding the input image data so as to obtain decoded image data; detection means for detecting an edge in the image data based on the decoded image data; identifying means for identifying a block of the decoded image data on the basis of a detection result by said detection means, wherein the block identified in said identifying step has a second block size different from the first block size; and eliminating means for eliminating a block distortion caused by encoding image data in blocks of the first block size, by correcting the decoded image data in the block identified by said identifying means.
Claim 9
Dependent Claim
125 words
An image processing apparatus comprising: input means for inputting image data encoded in blocks of a first block size; decoding means for decoding the input image data so as to obtain decoded image data; detection means for detecting an edge in the image data based on the decoded image data; identifying means for identifying a block of the decoded image data on the basis of a detection result by said detection means, wherein the block identified in said identifying step has a second block size different from the first block size; and eliminating means for eliminating a block distortion caused by encoding image data in blocks of the first block size, by correcting the decoded image data in the block identified by said identifying means.
Claim 10
Dependent Claim
25 words
An apparatus according to claim 7, wherein the image data is obtained by decoding image data coded in units of blocks, each having N×N pixels.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 8, wherein presence of the edge is examined in units of the blocks.
Claim 12
Dependent Claim
26 words
An apparatus according to claim 9, wherein said detection means detects the edge on the basis of estimated values of four corner points of the block.
Claim 13
Dependent Claim
19 words
An apparatus according to claim 7, wherein the block distortion is generated by a loss of an AC component.
Claim 14
Dependent Claim
13 words
An apparatus according to claim 7, wherein said correction means performs linear interpolation.
References Cited (Backward Citations)
US4797945A
Cited
US5023919A
Cited
US4821119A
Cited
US5241395A
Cited
US5282255A
Cited
US5109438A
Cited
US5561608A
Cited
US5576767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |