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US5301040A
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Image processing apparatus and method
Assignee: Canon Inc
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Filing: 1992-04-22
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Granted: 1994-04-05
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Expires: 2012-04-22
Abstract
Abstract An apparatus is provided for quantizing data obtained by transforming image data to a frequency zone so as to encode it. The speed at which such an apparatus performs processing is increased. Data is quantized on the basis of a plurality of coefficients C 1 for controlling a quantizing step. As a result of the quantization, reference encoding data items Nb1 to Nb4 are obtained. Coefficients C 5 to C 7 for controlling the quantizing step are generated when image data which is delayed by one frame is quantized. At this time, the data items Nb1 to Nb 4 are output by bit-shifting the result of the quantization.
Inventors
- 👤 Nobuhiro Hoshi
- 👤 Kenichi Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:32
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/134; H04N19/146; H04N19/15; H04N19/169; H04N19/17; H04N19/176; H04N19/60; H04N19/13; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
An image processing apparatus comprising: input means for inputting image data; quantizing means for quantizing the image data and outputting quantized digital data; first encoding means for encoding the quantized digital data and outputting first information regarding a number of bits of the quantized digital data as encoded; shifting means for performing a bit shift on the quantized digital data in order to reduce an amount of the quantized digital data and outputting bit shifted quantized digital data; second encoding means for encoding the bit shifted quantized digital data output from said shifting means and outputting second information regarding a number of bits of the bit shifted quantized digital data as encoded; calculating means for calculating a suitable quantizing parameter for quantizing the image data in accordance with the first and second information.
Claim 2
Dependent Claim
133 words
An image processing apparatus comprising: input means for inputting image data; quantizing means for quantizing the image data and outputting quantized digital data; first encoding means for encoding the quantized digital data and outputting first information regarding a number of bits of the quantized digital data as encoded; shifting means for performing a bit shift on the quantized digital data in order to reduce an amount of the quantized digital data and outputting bit shifted quantized digital data; second encoding means for encoding the bit shifted quantized digital data output from said shifting means and outputting second information regarding a number of bits of the bit shifted quantized digital data as encoded; calculating means for calculating a suitable quantizing parameter for quantizing the image data in accordance with the first and second information.
Claim 3
Dependent Claim
17 words
An image processing apparatus according to claim 1 further comprising means for directly converting said image data.
Claim 4
Dependent Claim
21 words
An image processing apparatus according to claim 1 further comprising second quantizing means for performing quantization based on said quantizing parameter.
Claim 5
Dependent Claim
35 words
An image processing apparatus according to claim 1, wherein said suitable parameter is a parameter which is set so that the amount of encoded image data of one screen is less than a predetermined amount.
Claim 6
Dependent Claim
18 words
An image processing apparatus according to claim 1, wherein said first and second encoding means parallelly perform encoding.
Claim 7
Dependent Claim
26 words
An image processing apparatus according to claim 5 further comprising delaying means for delaying the image data while said first and second encoding means perform encoding.
Claim 8
Dependent Claim
18 words
An image processing apparatus according to claim 1, wherein said apparatus is an apparatus for encoding moving images.
Claim 9
Dependent Claim
142 words
An image processing method comprising the steps of: an input step of inputting image data; a quantizing step of quantizing the image data and outputting quantized digital data; a first encoding step of encoding the quantized digital data and outputting first information regarding a number of bits of the quantized digital data as encoded; a shifting step of performing a bit shift on the quantized digital data in order to reduce an amount of the quantized digital data and outputting bit shifted quantized digital data; a second encoding step of encoding the bit shifted quantized digital data output from said shifting means and outputting second information regarding a number of bits of the bit shifted quantized digital data as encoded; a calculating step of calculating a suitable quantizing parameter for quantizing the image data in accordance with the first and second information.
Claim 10
Dependent Claim
142 words
An image processing method comprising the steps of: an input step of inputting image data; a quantizing step of quantizing the image data and outputting quantized digital data; a first encoding step of encoding the quantized digital data and outputting first information regarding a number of bits of the quantized digital data as encoded; a shifting step of performing a bit shift on the quantized digital data in order to reduce an amount of the quantized digital data and outputting bit shifted quantized digital data; a second encoding step of encoding the bit shifted quantized digital data output from said shifting means and outputting second information regarding a number of bits of the bit shifted quantized digital data as encoded; a calculating step of calculating a suitable quantizing parameter for quantizing the image data in accordance with the first and second information.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
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