US6058217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image coding apparatus for coding an image of a component signal
Assignee: Sony Corp
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Filing: 1997-07-14
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Granted: 2000-05-02
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Expires: 2017-07-14
Abstract
Abstract In an image coding apparatus, an image signal constituted of R, G, B components is coded in a high efficiency. The image coding apparatus is arranged by: block making means for subdividing the image to make a predetermined number of image blocks; maximum/minimum value detecting means for detecting a maximum value and a minimum value of each of the plural components which constitute the component signals in pixels within the blocks; dynamic range calculating means for calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of the plural components; block dynamic range detecting means for detecting a block dynamic range equal to a maximum value thereof from the dynamic range of each of the respective plural components; quantizing step width determining means for determining a quantizing step width used to quantize each of the plural components based upon the block dynamic range; and quantizing means for quantizing each of the plural components in accordance with the quantizing step width determined by the quantizing step width determining means.
Inventors
- 👤 Tetsujiro Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:55
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
An image coding apparatus for coding an image of a component signal constituted by a plurality of components, comprising: block making means for subdividing said image to make a predetermined number of image blocks; maximum/minimum value detecting means for detecting a maximum value and a minimum value of each of said plural components which constitute the component signals in pixels within said blocks; dynamic range calculating means for calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; block dynamic range detecting means for detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; quantizing step width determining means for determining a quantizing step width used to quantize each of said plural components based upon said block dynamic range; and quantizing means for quantizing each of said plural components in accordance with said quantizing step width determined by said quantizing step width determining means.
Claim 2
Dependent Claim
169 words
An image coding apparatus for coding an image of a component signal constituted by a plurality of components, comprising: block making means for subdividing said image to make a predetermined number of image blocks; maximum/minimum value detecting means for detecting a maximum value and a minimum value of each of said plural components which constitute the component signals in pixels within said blocks; dynamic range calculating means for calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; block dynamic range detecting means for detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; quantizing step width determining means for determining a quantizing step width used to quantize each of said plural components based upon said block dynamic range; and quantizing means for quantizing each of said plural components in accordance with said quantizing step width determined by said quantizing step width determining means.
Claim 3
Dependent Claim
47 words
An image coding apparatus as claimed in claim 1, further comprising: difference calculating means for calculating a difference between each of said plural components and a minimum value thereof, wherein: said quantizing means quantizes the difference between each of said plural components and the minimum value thereof.
Claim 4
Dependent Claim
135 words
An image coding method for coding an image of a component signal constituted by a plurality of components, comprising the steps of: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width.
Claim 5
Dependent Claim
135 words
An image coding method for coding an image of a component signal constituted by a plurality of components, comprising the steps of: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width.
Claim 6
Dependent Claim
185 words
An image decoding apparatus for decoding coded data produced by coding an image of a component signal constituted by a plurality of components wherein: in the case that said coded data is equal to such quantized data which is obtained by: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width; said image decoding apparatus is comprised of: converting means for converting the quantized data corresponding to each of said plural components into a predetermined level based on said block dynamic range.
Claim 7
Dependent Claim
185 words
An image decoding apparatus for decoding coded data produced by coding an image of a component signal constituted by a plurality of components wherein: in the case that said coded data is equal to such quantized data which is obtained by: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width; said image decoding apparatus is comprised of: converting means for converting the quantized data corresponding to each of said plural components into a predetermined level based on said block dynamic range.
Claim 8
Dependent Claim
152 words
A recording medium on which decoded data produced by coding an image of a component signal constituted by a plurality of components has been recorded wherein: said coded data is equal to such quantized data which is obtained by: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width.
Claim 9
Dependent Claim
152 words
A recording medium on which decoded data produced by coding an image of a component signal constituted by a plurality of components has been recorded wherein: said coded data is equal to such quantized data which is obtained by: subdividing said image to make a predetermined number of image blocks; detecting a maximum value and a minimum value of each of said plural components for constituting the component signals in pixels within said blocks; calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of said plural components; detecting a block dynamic range equal to a maximum value thereof from said dynamic range of each of the respective plural components; determining a quantizing step width used to quantize each of said plural components based on said block dynamic range; and quantizing each of said plural components in accordance with said quantizing step width.
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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) | 2003-05-02 | 2003-11-01 | 2004-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-02 | 2007-11-01 | 2008-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-02 | 2011-11-01 | 2012-05-02 | $7700.00 | Window Closed / Lapsed |