US5570203A
Expired / Lapsed
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Image signal coding device
Assignee: Fujifilm Business Innovation Corp
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Filing: 1994-10-20
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Granted: 1996-10-29
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Expires: 2014-10-20
Abstract
Abstract An image signal coding device capable of attaining a high-speed coding operation without increasing a circuit scale. The image signal coding device includes a DCT section for performing two-dimensional orthogonal transform to each of plural pixel blocks obtained by dividing an image signal to generate a transform coefficient, a linear quantization section for linearly quantizing the transform coefficient by using given quantization characteristics to generate a quantized coefficient, and a variable length coding section for performing variable length coding to the quantized coefficient to generate code data. The image signal coding device further includes an effective region holding section for holding region information including a range of the transform coefficient to be linearly quantized by the linear quantization section and a range of the quantized coefficient to be coded by the variable length coding section.
Inventors
- 👤 Kazuhiro Suzuki
- 👤 Taro Yokose
- 👤 Toshiaki Yoshinari
- 👤 Yutaka Koshi
- 👤 Koh Kamizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:33
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/60; H04N19/132
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
In an image signal coding device including orthogonal transform means for performing a two-dimensional orthogonal transform to generate transform coefficients for each of a plurality of rectangular pixel blocks each consisting of N×M pixels (N, M being positive integers) obtained by dividing an image signal, quantization means for linearly quantizing said transform coefficients by using given quantization characteristics to generate quantized coefficients, and variable length coding means for performing variable length coding to said quantized coefficients to generate code data; the improvement comprising region holding means for holding region information including a first range of said transform coefficients to be linearly quantized by said quantization means and a second range of said quantized coefficients to be coded by said variable length coding means, wherein said quantizing means omits linearly quantizing the transform coefficients outside of the first range and said variable length coding means omits coding of the quantized coefficients outside of the second range, thereby increasing coding speed.
Claim 2
Dependent Claim
159 words
In an image signal coding device including orthogonal transform means for performing a two-dimensional orthogonal transform to generate transform coefficients for each of a plurality of rectangular pixel blocks each consisting of N×M pixels (N, M being positive integers) obtained by dividing an image signal, quantization means for linearly quantizing said transform coefficients by using given quantization characteristics to generate quantized coefficients, and variable length coding means for performing variable length coding to said quantized coefficients to generate code data; the improvement comprising region holding means for holding region information including a first range of said transform coefficients to be linearly quantized by said quantization means and a second range of said quantized coefficients to be coded by said variable length coding means, wherein said quantizing means omits linearly quantizing the transform coefficients outside of the first range and said variable length coding means omits coding of the quantized coefficients outside of the second range, thereby increasing coding speed.
Claim 3
Dependent Claim
31 words
An image signal coding device according to claim 1, wherein said region information is decided according to at least one of said quantization characteristics and an original content to be coded.
Claim 4
Dependent Claim
33 words
An image signal coding device according to claim 1, wherein said region information is based on zigzag scanning from a low degree to a high degree in a matrix of said transform coefficients.
Claim 5
Dependent Claim
20 words
The image signal coding device of claim 3, wherein the zigzag scanning is performed until a non-zero coefficient is detected.
Claim 6
Dependent Claim
36 words
An image signal coding device according to claim 1, wherein said region information is set according to order of zigzag scanning from a low degree to a high degree in a matrix of said quantization coefficients.
Claim 7
Dependent Claim
22 words
An image signal coding device according to claim 1, wherein said quantization characteristics comprise a scaling factor for a preset quantization matrix.
Claim 8
Dependent Claim
22 words
An image signal coding device according to claim 2, wherein said quantization characteristics comprise a scaling factor for a preset quantization matrix.
Claim 9
Dependent Claim
22 words
An image signal coding device according to claim 1, wherein said quantization characteristics comprise identifiers for a plurality of prepared quantization matrices.
Claim 10
Dependent Claim
22 words
An image signal coding device according to claim 2, wherein said quantization characteristics comprise identifiers for a plurality of prepared quantization matrices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |