WO2001045394A1 - Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display - Google Patents
Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display Download PDFInfo
- Publication number
- WO2001045394A1 WO2001045394A1 PCT/US2000/033655 US0033655W WO0145394A1 WO 2001045394 A1 WO2001045394 A1 WO 2001045394A1 US 0033655 W US0033655 W US 0033655W WO 0145394 A1 WO0145394 A1 WO 0145394A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- periodic signal
- video
- electrostatically
- frequency
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
Definitions
- the present invention relates to the processing of video signals, and more particularly, to the amelioration of artifacts introduced by periodic signals leaking or introduced into the luminance channel of a color television receiver.
- the spectral energy of the luminance (Y) signal is essentially centered at harmonics of the line scanning frequency nf h where n is an integer.
- a luminance signal typically has frequency components of 1f h , 2f h , 3f h , 4f h , etc.
- the chrominance (C) signal spectral energy peaks occur at odd harmonics of one half the line scanning frequency, i.e., (n+1/2)f h where n is an integer.
- the Y and C energy spectra are frequency interleaved.
- U.S. Patent No. 4,607,286 of Weimer concerns the electrostatic coupling of forward clocking signals in a CCD imager to the underlying bulk semiconductor substrate which introduces transient disturbances leaving visible artifacts in television pictures reconstructed from the video signals generated from the CCD imager.
- An additional clocked delay places the disturbances into the line retrace interval and the disturbances are removed from the video signals by line retrace blanking.
- U.S. Patent No. 4,003,077 of Hickock concerns a color video recorder wherein the chrominance information is frequency converted before recording to a frequency to render, upon display, an artifact pattern of one line of the picture frame being 180 degrees out of phase with the artifact pattern of an adjacent line, so that the resultant artifact pattern, although present, seemingly disappears due to the integrating effect of the eye of the viewer.
- the exemplary embodiment of the present invention concerns an integrated circuit number W49C31-20A which is a low-power CMOS monolithic chip made by the IC Works of San Jose, California, USA, and includes a graphics processor, a video processor and a spread spectrum clock.
- the present invention concerns a video processor wherein a signal having a frequency within the video passband "leaks" into the video processor, and in the exemplary embodiment, the leaked signal, which produces an artifact on a video display, is derived from the modulation signal of a spread spectrum clock. It should be noted however, for purposes of the present invention, that the leaked artifact producing signal can be derived from any source, and leaked or introduced into any common video processor.
- the construction and circuitry of the exemplary chip including the exemplary video processor, the exemplary spread spectrum clock, and the exemplary generation of the modulation signal for the spread spectrum clock, all form no part of the present invention.
- the artifact creating signal leaks into the video path by electrostatic and/or capacitive coupling either between sections, or through electrostatic and/or capacitive coupling by the respective structures with the semiconductor substrate material.
- the artifact creating signal in the exemplary embodiment is the modulation signal of a spread spectrum clock which falls within the video passband of up to 10 MHz.
- the carrier signal for the clock is outside of the video passband, i.e., 85 MHz, but if it fell within the video passband, or any other frequency selectable, periodic, artifact producing signal fell within the video passband, the present invention would be equally applicable in order to "hide" the produced artifact.
- the signal for FM modulating the carrier signal of the clock due to internal signal leakage within the chip, caused an artifact to appear when viewed on a line scanned video display such as a cathode ray tube.
- a line scanned video display such as a cathode ray tube.
- the frequency of the interfering signal was selectable.
- f h the frequency of the interfering signal so that the signal frequency would be an odd harmonic of one half the horizontal line scan frequency commonly referred to as f h , which for an NTSC signal is 15,734.26573 Hz.
- the particular selection of frequency of the interfering modulation signal of the spread spectrum clock was 39.336 kHz (2.5 multiplied by f h ), which can be rounded up or down to the nearest integral kHz of 39 kHz or 40 kHz.
- the artifact displayed on adjacent scan lines on the line scanned display are 180 degrees out of phase with each other.
- the artifact is rendered largely visually canceled when viewed due to the integrating characteristics of the eye of the viewer, even though the artifact is still there.
- This is true for both interlaced and progressive scan frames except that one line at the top or bottom of each interlace field will not appear to be canceled.
- the line having the visually unreduced artifact can be placed in the vertical overscan portion of picture, and thus will be hidden, or can be hidden by vertical blanking.
- the interfering signal is also frequency interleaved with the luminance signal, as discussed above in the background section.
- the frequency interleaving further reduces artifacts.
- the present invention is applicable to the choice of the frequency of a periodic signal within the video passband, leaked or intentionally introduced by whatever means, into a video signal path of whatever means, which causes an artifact to appear when viewed on a line scanned display.
- Such an intentional introduction of an artifact producing signal into the video path can be, e.g., an information encoded signal.
- the artifact producing signal of the exemplary embodiment is an information encoded signal but the introduction into the video signal path was unintentional.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Processing Of Color Television Signals (AREA)
- Picture Signal Circuits (AREA)
- Television Systems (AREA)
- Details Of Television Scanning (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA02005973A MXPA02005973A (en) | 1999-12-16 | 2000-12-12 | Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display. |
EP00988044A EP1238534A1 (en) | 1999-12-16 | 2000-12-12 | Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display |
AU24297/01A AU2429701A (en) | 1999-12-16 | 2000-12-12 | Apparatus and method for reducing artifacts present in a line scanned video display |
JP2001546155A JP2003517789A (en) | 1999-12-16 | 2000-12-12 | Apparatus and method for reducing visual effects of artifacts in line-scanned video displays |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/465,038 | 1999-12-16 | ||
US09/465,038 US7106385B1 (en) | 1999-12-16 | 1999-12-16 | Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001045394A1 true WO2001045394A1 (en) | 2001-06-21 |
WO2001045394A8 WO2001045394A8 (en) | 2001-11-01 |
Family
ID=23846264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/033655 WO2001045394A1 (en) | 1999-12-16 | 2000-12-12 | Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display |
Country Status (8)
Country | Link |
---|---|
US (1) | US7106385B1 (en) |
EP (1) | EP1238534A1 (en) |
JP (1) | JP2003517789A (en) |
KR (1) | KR100695308B1 (en) |
CN (1) | CN1268118C (en) |
AU (1) | AU2429701A (en) |
MX (1) | MXPA02005973A (en) |
WO (1) | WO2001045394A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20070012047A (en) * | 2005-07-22 | 2007-01-25 | 삼성전자주식회사 | Digital video processing apparatus and control method thereof |
US10645337B1 (en) * | 2019-04-30 | 2020-05-05 | Analong Devices International Unlimited Company | Video line inversion for reducing impact of periodic interference signals on analog video transmission |
US11736815B2 (en) | 2020-12-15 | 2023-08-22 | Analog Devices International Unlimited Company | Interferer removal for reducing impact of periodic interference signals on analog video transmission |
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US4291330A (en) * | 1978-04-28 | 1981-09-22 | Sony Corporation | Video signal processing circuit for eliminating an interfering signal |
US4607286A (en) * | 1985-01-04 | 1986-08-19 | Rca Corporation | Removal of line selection artifacts from trace portions of line transfer CCD imager video output signals |
US4831463A (en) * | 1987-01-30 | 1989-05-16 | Faroudja Y C | Video processing in which high frequency luminance components are folded into a mid-band spectrum |
US5461426A (en) * | 1993-08-20 | 1995-10-24 | Samsung Electronics Co., Ltd. | Apparatus for processing modified NTSC television signals, with digital signals buried therewithin |
US5596418A (en) * | 1990-08-17 | 1997-01-21 | Samsung Electronics Co., Ltd. | Deemphasis and subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal |
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DE2263678B2 (en) * | 1971-12-27 | 1976-04-29 | Hitachi, Ltd., Tokio | CIRCUIT FOR SEPARATING THE NTSC COLOR TELEVISION SIGNAL |
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USRE32194E (en) | 1980-05-10 | 1986-06-24 | Victor Company Of Japan, Ltd. | Means for compatibly reproducing video discs recorded according to different broadcast standards |
US4613828A (en) * | 1985-06-25 | 1986-09-23 | Eastman Kodak Company | Injection-locked video frequency oscillator |
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US5625421A (en) | 1994-01-14 | 1997-04-29 | Yves C. Faroudja | Suppression of sawtooth artifacts in an interlace-to-progressive converted signal |
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US5629739A (en) | 1995-03-06 | 1997-05-13 | A.C. Nielsen Company | Apparatus and method for injecting an ancillary signal into a low energy density portion of a color television frequency spectrum |
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-
1999
- 1999-12-16 US US09/465,038 patent/US7106385B1/en not_active Expired - Fee Related
-
2000
- 2000-12-12 MX MXPA02005973A patent/MXPA02005973A/en active IP Right Grant
- 2000-12-12 WO PCT/US2000/033655 patent/WO2001045394A1/en active Application Filing
- 2000-12-12 KR KR1020027007524A patent/KR100695308B1/en not_active IP Right Cessation
- 2000-12-12 JP JP2001546155A patent/JP2003517789A/en not_active Withdrawn
- 2000-12-12 CN CNB00817041XA patent/CN1268118C/en not_active Expired - Fee Related
- 2000-12-12 AU AU24297/01A patent/AU2429701A/en not_active Abandoned
- 2000-12-12 EP EP00988044A patent/EP1238534A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4003077A (en) * | 1976-02-25 | 1977-01-11 | Eastman Kodak Company | Method and apparatus for cancelling chrominance artifacts |
US4134126A (en) * | 1976-08-20 | 1979-01-09 | Sony Corporation | Color recorder having means for reducing luminance crosstalk in displayed image |
US4291330A (en) * | 1978-04-28 | 1981-09-22 | Sony Corporation | Video signal processing circuit for eliminating an interfering signal |
US4607286A (en) * | 1985-01-04 | 1986-08-19 | Rca Corporation | Removal of line selection artifacts from trace portions of line transfer CCD imager video output signals |
US4831463A (en) * | 1987-01-30 | 1989-05-16 | Faroudja Y C | Video processing in which high frequency luminance components are folded into a mid-band spectrum |
US5596418A (en) * | 1990-08-17 | 1997-01-21 | Samsung Electronics Co., Ltd. | Deemphasis and subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal |
US5461426A (en) * | 1993-08-20 | 1995-10-24 | Samsung Electronics Co., Ltd. | Apparatus for processing modified NTSC television signals, with digital signals buried therewithin |
Also Published As
Publication number | Publication date |
---|---|
AU2429701A (en) | 2001-06-25 |
JP2003517789A (en) | 2003-05-27 |
US7106385B1 (en) | 2006-09-12 |
MXPA02005973A (en) | 2002-10-23 |
EP1238534A1 (en) | 2002-09-11 |
CN1268118C (en) | 2006-08-02 |
WO2001045394A8 (en) | 2001-11-01 |
CN1409920A (en) | 2003-04-09 |
KR20020062333A (en) | 2002-07-25 |
KR100695308B1 (en) | 2007-03-15 |
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