US6650786B2
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Image encoding apparatus and image decoding apparatus
Assignee: Fujifilm Business Innovation Corp
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Filing: 2002-08-28
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Granted: 2003-11-18
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Expires: 2022-08-28
Abstract
Abstract An input image is subjected to transform by a DCT transforming unit 20. A coefficient analyzing unit 30 compares a predetermined coefficient and coefficient data 120, and obtains low-frequency image data 150 of the input image by a high-frequency coefficient masking unit 50 and an inverse DCT unit 60 on the basis of a result of that comparison. A pixel subsampling unit 70 receives this low-frequency image data 150, and generates a subsampled image on the basis of the aforementioned result of comparison. The subsampled image and coefficient information are transmitted to a decoding side. A decoding apparatus decodes an image on the basis of the subsampled image and the coefficient information.
Inventors
- 👤 Taro Yokose
- 👤 Ikken So
- 👤 Shunichi Kimura
- 👤 Yutaka Koshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:07
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/132; G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/0338; G06T; G06T3/00; G06T3/40; G06T3/4084; H01; H01H; H01H25/00; H01H25/04; H01H25/041; H04N19/169; H04N19/18; H04N19/60; H01H1/00; H01H1/58; H01H2001/5888; H01H2239/00; H01H2239/024; H01H25/008
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
An image decoding apparatus comprising: coefficient-information input means for inputting coefficient information; subsampled-image input means for inputting a subsampled image; coefficient interpolating means for interpolating a frequency component by a predetermined technique involving solving a set of linear equations in correspondence with the subsampled image inputted by said subsampled-image input means and the coefficient information inputted by said coefficient-information input means; inversely transforming means for effecting inverse frequency transform so as to convert the frequency component interpolated by said coefficient interpolating means into an image; and decoded-image output means for outputting the image converted by said inversely transforming means.
Claim 2
Dependent Claim
99 words
An image decoding apparatus comprising: coefficient-information input means for inputting coefficient information; subsampled-image input means for inputting a subsampled image; coefficient interpolating means for interpolating a frequency component by a predetermined technique involving solving a set of linear equations in correspondence with the subsampled image inputted by said subsampled-image input means and the coefficient information inputted by said coefficient-information input means; inversely transforming means for effecting inverse frequency transform so as to convert the frequency component interpolated by said coefficient interpolating means into an image; and decoded-image output means for outputting the image converted by said inversely transforming means.
Claim 3
Dependent Claim
49 words
An image decoding apparatus according to claim 1 , further comprising: image decoding means for decoding into an image a code subjected to image encoding with respect to the subsampled image, wherein said subsampled-image input means inputs as the subsampled image the image decoded by said image decoding means.
Claim 4
Dependent Claim
30 words
An image decoding apparatus according to claim 2 , wherein the decoding effected by said image decoding means is inverse processing of lossless coding or inverse processing of predictive coding.
Claim 5
Dependent Claim
62 words
An image decoding apparatus according to claim 1 , further comprising: pixel-value correcting means for replacing a pixel, which is included in the subsampled image inputted by said subsampled-image input means of the image converted by said inversely transforming means, with the pixel value of the subsampled image, wherein said decoded-image output means outputs the image corrected by said pixel-value correcting means.
Claim 6
Dependent Claim
40 words
An image decoding apparatus according to claim 1 , wherein the frequency transform effected by said inversely transforming means and said inversely transforming means is one of discrete cosine transform, Fourier transform, discrete sine transform, subband transform, and wavelet transform.
Claim 7
Dependent Claim
70 words
An image decoding apparatus according to claim 1 , wherein the coefficient interpolation effected by said coefficient interpolating means is one of the solving of a simultaneous system of linear equations concerning frequency coefficients and pixel values, computation of an inverse matrix determined in advance with respect to the simultaneous system of linear equations concerning frequency coefficients and pixel values, and low-pass filtering of the subsampled image or approximate processing.
Claim 8
Dependent Claim
56 words
An image decoding method comprising: inputting coefficient information; inputting a subsampled image; interpolating a frequency component by a predetermined technique involving solving a set of linear equations in correspondence with the inputted subsampled image and the inputted coefficient information; effecting inverse frequency transform so as to convert the interpolated frequency component; and outputting a converted image.
Claim 9
Dependent Claim
56 words
An image decoding method comprising: inputting coefficient information; inputting a subsampled image; interpolating a frequency component by a predetermined technique involving solving a set of linear equations in correspondence with the inputted subsampled image and the inputted coefficient information; effecting inverse frequency transform so as to convert the interpolated frequency component; and outputting a converted image.
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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) | 2006-11-17 | 2007-05-19 | 2007-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-11-17 | 2011-05-19 | 2011-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-11-17 | 2015-05-19 | 2015-11-18 | $7700.00 | Window Closed / Lapsed |