US6339657B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image compression of a facial region by adaptive quantization based on resolution
Assignee: Toshiba Corp
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Filing: 1999-08-03
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Granted: 2002-01-15
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Expires: 2019-08-03
Abstract
Abstract An image data coding and/or decoding system according to the present invention has an input terminal for inputting an image data signal, a screen-area determining section for determining the area of the produced screen by analyzing the image data signal, a code amount assigning section for assignment of the screen on the basis of the determined results from the screen-area determining section, and a coding section for coding the image data signal inputted using the control signal from the code amount assigning control section.
Inventors
- 👤 Noboru Yamaguchi
- 👤 Toshiaki Watanabe
- 👤 Kenshi Dachiku
- 👤 Yoshihiro Kikuchi
- 👤 Takashi Ida
- 👤 Takeshi Chujoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:39
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/59; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/124; H04N19/129; H04N19/134; H04N19/136; H04N19/169; H04N19/17; H04N19/18; H04N19/187; H04N19/189; H04N19/196; H04N19/48; H04N19/503; H04N19/60; H04N19/61; H04N19/80; H04N19/132; H04N19/146; H04N19/149; H04N19/15; H04N19/20; H04N19/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
An image coding system comprising: a frame memory for storing a first image signal of a current frame and a second image signal of a previous frame of an inputted image data signal; screen-area determining means configured to determine an area of a reproduced screen reproduced on the basis of the inputted image data signal, a resolution of an image displayed to said area being higher than that of a peripheral area; code-amount assigning control means configured to output a control signal which controls an assignment of a code amount using a weight function depending on the number of image pixels in the determined area; a space-time filter for space-time filtering said first and second image signals on the basis of the control signal from said code-amount assigning control means so as to output a filtered signal; and coding means configured to code the filtered signal by weighting the code amount of the control signal in accordance with a position in the screen.
Claim 2
Dependent Claim
163 words
An image coding system comprising: a frame memory for storing a first image signal of a current frame and a second image signal of a previous frame of an inputted image data signal; screen-area determining means configured to determine an area of a reproduced screen reproduced on the basis of the inputted image data signal, a resolution of an image displayed to said area being higher than that of a peripheral area; code-amount assigning control means configured to output a control signal which controls an assignment of a code amount using a weight function depending on the number of image pixels in the determined area; a space-time filter for space-time filtering said first and second image signals on the basis of the control signal from said code-amount assigning control means so as to output a filtered signal; and coding means configured to code the filtered signal by weighting the code amount of the control signal in accordance with a position in the screen.
Claim 3
Dependent Claim
151 words
The image coding system according to claim 1 , further comprising: a resolution detecting means serving as said screen-area determining means and for detecting the resolution of the inputted image signal; a code-amount assigning control circuit serving as said code-amount assigning control means for varying the weight distribution function for assigning the code amount corresponding to a position in the screen in accordance with said resolution detected by said resolution detecting means; an encoder serving as said coding means and including quantization and inverse quantization means which performs the weighting of the produced code amount so as to vary the quantization characteristic in accordance with said resolution; and face-region detecting means configured to detect a face region on the basis of the first image signal of the current frame and the second image signal of the previous frame and for outputting a detected result signal to said code-amount assigning control means.
Claim 4
Dependent Claim
139 words
The image coding system according to claim 1 , further comprising: a resolution detecting means serving as said screen-area determining means and for detecting the resolution of the inputted image signal; a code-amount assigning control circuit serving as said code-amount assigning control means configured to vary the weight distribution function for assigning the code amount corresponding to a position in the screen in accordance with said resolution detected by said resolution detecting means; an encoder serving as said coding means and for coding said filtered signal on the basis of the control signal from said code-amount assigning control means; and face-region detecting means configured to detect a face region on the basis of said first and second image signals each of the current and previous frames and for outputting a detected result signal to said code-amount assigning control means.
Claim 5
Dependent Claim
40 words
The image coding system according to claim 3 , wherein said encoder includes a quantization and inverse quantization means which performs the weighting of the produced code amount so as to vary the quantization characteristic in accordance with said resolution.
Claim 6
Dependent Claim
166 words
The image coding system according to claim 1 , further comprising: a reception side screen-size detecting means serving as said screen-area determining means and for receiving an output signal from said frame memory to detect a size of said screen; a code-amount assigning control circuit serving as said code-amount assigning control means configured to vary the weight distribution function for assigning the code amount corresponding to a position in the screen in accordance with said size of said screen detected by said reception side screen-size detecting means; an encoder serving as said coding means and including quantization arid inverse quantization means which performs the weighting of the produced code amount so as to vary the quantization characteristic in accordance! with said resolution; and face-region detecting means configured to detect a face region on the basis of a first image signal of the current frame and a second image signal of a previous frame and for outputting a detected result signal to said code-amount assigning control means.
Claim 7
Dependent Claim
135 words
The image coding system according to claim 1 , further comprising: a code-amount assigning control circuit serving as said code-amount assigning control means configured to vary the weighting distribution function for assigning the code amount corresponding to a screen size outputted from screen-area determining means which is externally provided for setting a size of said screen; an encoder serving as said coding means and including quantization and inverse quantization means which performs the weighting of the produced code amount so as to vary the quantization characteristic in accordance with said resolution; and face-region detecting means configured to detect a face region on the basis of the first image signal of the current frame and the second image signal of the previous frame and for outputting a detected result signal to said code-amount assigning control means.
Claim 8
Dependent Claim
50 words
The image coding system according to claim 1 , wherein said code amount assigning control means performs a weighting in a manner that a first code amount occurring in a peripheral region of the screen is less than a second code amount occurring in a center region of the screen.
Claim 9
Dependent Claim
134 words
An image coding method comprising the steps of: determining an area of a reproduced screen reproduced on the basis of an inputted image data signal, a resolution of an image displayed to said area being higher than that of a peripheral area, wherein the inputted image signal includes a first image signal of a current frame and a second image signal of a previous frame; outputting a control signal which controls an assignment of a code amount using a weight function depending on the number of image pixels in the determined area; space-time filtering said first and second image signals on the basis of the control signal, and outputting a filtered signal; and coding the filtered signal by weighting the code amount of the control signal in accordance with a position in the screens.
Claim 10
Dependent Claim
134 words
An image coding method comprising the steps of: determining an area of a reproduced screen reproduced on the basis of an inputted image data signal, a resolution of an image displayed to said area being higher than that of a peripheral area, wherein the inputted image signal includes a first image signal of a current frame and a second image signal of a previous frame; outputting a control signal which controls an assignment of a code amount using a weight function depending on the number of image pixels in the determined area; space-time filtering said first and second image signals on the basis of the control signal, and outputting a filtered signal; and coding the filtered signal by weighting the code amount of the control signal in accordance with a position in the screens.
Claim 11
Dependent Claim
51 words
The image coding method according to claim 8 , further comprising: detecting a face region on the basis of a first image signal for a current frame and a second image signal of a previous frame and of outputting a detected result signal to said step of outputting a control signal.
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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) | 2005-01-14 | 2005-07-16 | 2006-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-01-14 | 2009-07-16 | 2010-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-01-14 | 2013-07-16 | 2014-01-15 | $7700.00 | Window Closed / Lapsed |