US6400371B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television signal chrominance adjustment
Assignee: Comcast Cable Communications Management LLC
•
Filing: 1998-05-18
•
Granted: 2002-06-04
•
Expires: 2018-05-18
Abstract
Abstract The invention provides an improved method and system for presenting color television signals. Television signal chrominance values for foreground elements are adjusted in response to television signal chrominance values for background elements, so as to minimize display artifacts while preserving the relative color contrast between foreground and background. (1) The invention modifies I and Q values of the foreground color to reduce the difference of the foreground I and Q with respect to the background I and Q. (2) The invention modifies Y, I and Q values of the foreground color to avoid colors known to display poorly for selected output devices. (3) The invention modifies Y values of the foreground color to maintain intended visual contrast between foreground and background colors. (4) The invention modifies Y, I and Q values of the foreground color to decrease cross-luminance separation artifacts at the border between foreground and background colors.
Inventors
- 👤 James Helman
- 👤 David Mott
- 👤 Chee Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:10
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N9/00; H04N9/77; G; G09; G09G; G09G2320/00; G09G2320/02; G09G2320/0242; G09G2370/00; G09G2370/02; G09G2370/027
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
76 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to HTML codes in said document.
Claim 2
Independent Claim
76 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to HTML codes in said document.
Claim 3
Independent Claim
80 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to controls in a web browser responsive to said document.
Claim 4
Independent Claim
80 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to controls in a web browser responsive to said document.
Claim 5
Independent Claim
77 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to the visual content of said document.
Claim 6
Independent Claim
77 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said color modifier is further responsive to the visual content of said document.
Claim 7
Independent Claim
67 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein said color modifier is further responsive to control codes generated by the television.
Claim 8
Independent Claim
67 words
A system for modifying color video signals representing a visual image for display on a television, said system comprising: a color recognizer for recognizing foreground and background colors in the visual image; a color modifier for modifying luminance and chrominance of said foreground colors in response to the recognized foreground and background colors; wherein said color modifier is further responsive to control codes generated by the television.
Claim 9
Dependent Claim
16 words
The system of claim 4 wherein said control codes can be modified by the television user.
Claim 10
Independent Claim
73 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to HTML codes in said document.
Claim 11
Independent Claim
73 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to HTML codes in said document.
Claim 12
Independent Claim
77 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to controls in a web browser for viewing said document.
Claim 13
Independent Claim
77 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to controls in a web browser for viewing said document.
Claim 14
Independent Claim
74 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to the visual content of said document.
Claim 15
Independent Claim
74 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein the visual image comprises a document generated in HTML, and said step of modifying said foreground color further comprises responding to the visual content of said document.
Claim 16
Independent Claim
64 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein said step of modifying said foreground color further comprises responding to control codes generated by the television.
Claim 17
Independent Claim
64 words
A method of modifying color video signals representing a visual image for display on a television, said method comprising: recognizing foreground and background colors in the visual image; and modifying chrominance and luminance of said foreground colors in response to the recognized foreground and background colors; wherein said step of modifying said foreground color further comprises responding to control codes generated by the television.
Claim 18
Dependent Claim
16 words
The method of claim 9 wherein said control codes may be modified by the television user.
References Cited (Backward Citations)
US4035835A
Cited
US4589013A
Cited
US4694329A
Cited
US4893114A
Cited
US5155847A
Cited
US5495610A
Cited
US5436673A
Cited
US5347622A
Cited
US6005574A
Cited
US5861871A
Cited
US5808628A
Cited
US5444861A
Cited
US5600364A
Cited
US5373561A
Cited
US5907315A
Cited
US5497422A
Cited
US5634051A
Cited
US5787172A
Cited
US5453779A
Cited
US5796840A
Cited
US5541638A
Cited
US5809287A
Cited
US5841896A
Cited
US5754939A
Cited
US5754938A
Cited
US5859969A
Cited
US6104727A
Cited
US5764992A
Cited
US5874967A
Cited
US5877741A
Cited
US5867166A
Cited
US6049628A
Cited
US5708845A
Cited
US5680458A
Cited
US6009363A
Cited
US5761306A
Cited
US6018768A
Cited
US5852673A
Cited
US5936606A
Cited
US5850232A
Cited
US5727129A
Cited
US5752042A
Cited
US6047269A
Cited
US6049835A
Cited
US5977960A
Cited
US5926624A
Cited
US5870765A
Cited
US5870559A
Cited
US5991799A
Cited
US6028583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-03 | 2005-12-03 | 2006-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-03 | 2009-12-03 | 2010-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-03 | 2013-12-03 | 2014-06-04 | $7700.00 | Window Closed / Lapsed |