EP0982708B1 - Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung von grossflächigem Flimmereffekt - Google Patents

Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung von grossflächigem Flimmereffekt Download PDF

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EP0982708B1
EP0982708B1 EP99115651A EP99115651A EP0982708B1 EP 0982708 B1 EP0982708 B1 EP 0982708B1 EP 99115651 A EP99115651 A EP 99115651A EP 99115651 A EP99115651 A EP 99115651A EP 0982708 B1 EP0982708 B1 EP 0982708B1
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French (fr)
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EP0982708A1 (de
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Carlos Correa
Rainer Zwing
Sebastien Weitbruch
Gangolf Hirtz
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THOMSON LICENSING
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Thomson Licensing SAS
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Priority claimed from EP98115607A external-priority patent/EP0982707A1/de
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2033—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/204—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames being organized in consecutive sub-frame groups
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels

Definitions

  • the invention relates to a method and apparatus for processing video pictures, in particular for large area flicker effect reduction.
  • the invention is closely related to a kind of video processing for improving the picture quality of pictures which are displayed on matrix displays like plasma display panels (PDP), display devices with digital micro mirror arrays (DMD)and all kind of displays based on the principle of duty cycle modulation (pulse width modulation) of light emission.
  • PDP plasma display panels
  • DMD digital micro mirror arrays
  • plasma display panels are known for many years, plasma displays are encountering a growing interest from TV manufacturers. Indeed, this technology now makes it possible to achieve flat colour panels of large size and with limited depths without any viewing angle constraints.
  • the size of the displays may be much larger than the classical CRT picture tubes would have ever been allowed.
  • a plasma display panel utilises a matrix array of discharge cells which could only be switched ON or OFF. Also unlike a CRT or LCD in which grey levels are expressed by analogue control of the light emission, in a PDP the grey level is controlled by modulating the number of light pulses per frame. This time-modulation will be integrated by the eye over a period corresponding to the eye time response.
  • this time-modulation repeats itself, with a base frequency equal to the frame frequency of the displayed video norm.
  • a light emission with base frequency of 50 Hz introduces large area flicker, which can be eliminated by field repetition in 100Hz CRT TV receivers.
  • the duty cycle of light emission in PDPs is ⁇ 50% for middle grey. This reduces the amplitude of the 50Hz frequency component in the spectrum, and thus large area flicker artefact, but due to the larger size of PDPs, with a larger viewing angle, even a reduced large area flicker becomes objectionable in terms of picture quality.
  • the present trend of increasing size and brightness of PDPs will also contribute to aggravate this problem in the future.
  • a tone display and apparatus is known in which it is proposed to divide at least one of the sub-fields in a multiple-bit binary sub-field code into at least two smaller sub-fields wherein at least one other sub-field is positioned between the two smaller sub-fields for improving the picture quality.
  • JP-A-05-127612 shows a method for increasing the field frequency by grouping of sub-fields in two consecutive groups.
  • the starting times of the two groups are adjusted so that light generation takes place in a time raster corresponding to the doubling of the field frequency.
  • This adjustment is done by using constant length sub-fields apart from so-called normal-bit sub-fields which have a length of twice a nonnormal-bit subfield, where the length T is determined by the number of sub-fields and the field length in time.
  • the reduction of the large area effect is made by utilising an optimised sub-field organisation for the frame period.
  • the sub-fields in a frame period are organised in two consecutive groups, and the starting times of the two sub-field groups are adjusted to a time raster of 10 ms in the case of a video standard with 50Hz frame repetition rate by adding a first blanking period of a first dedicated length behind the last sub-field of the first sub-field group and a second blanking period of a second dedicated length behind the last sub-field of the second sub-field group; and by a specific coding it is achieved that to a value of a pixel a code word is assigned which distributes the active sub-field periods over the two sub-field groups.
  • the frame period will be divided in 8 lighting periods which are also very often referred to sub-fields, each one corresponding to one of the 8 bits.
  • the grey level 92 will also very often referred to sub-fields, each one corresponding to one of the 8 bits.
  • the grey level 92 will thus have the corresponding digital code word %1011100.
  • the sub-fields may consist of a number of small pulses with equal amplitude and equal duration. Without motion, the eye of the observer will integrate over about a frame period all the sub-periods and will have the impression of the right grey level. The above-mentioned sub-field organisation is shown in Fig. 1 .
  • FIG. 2 An example of a commonly used sub-field organisation for 60Hz video standards is shown in Fig. 2 .
  • the sub-field number has been increased to 12 sub-fields SF.
  • the relative duration of the sub-fields are given in Fig. 2 .
  • the lighting phase has a relative duration of 255 relative time units.
  • the value of 255 has been selected in order to be able to continue using the above mentioned 8 bit representation of the luminance level or RGB data which is being used for PDPs.
  • the seven most significant sub-fields have a relative duration of 32 relative time units.
  • the relative duration of a sub-field is often referred to the 'weight' of a sub-field, the expression will also be used hereinafter.
  • each sub-field SF there is a small time period in which no light is emitted. This time period is used for the addressing of the corresponding plasma cells. After the last sub-field a longer time period where no light is emitted is added. This time period corresponds to the vertical blanking period of the video standard. The implementation of such a vertical blanking period is necessary in order to be able to handle non-standard video signals generated in VCR's or video games, etc.
  • a digital representation of the grey level 92 in this sub-field organisation is e.g. 000001111100.
  • This figure is a 12 bit binary number corresponding to the 12 sub-fields. It will be used to control the lighting pulses for the corresponding pixel during a frame period. It should be noted, that there exist a few other possible 12 bit code words for the same grey level, due to the fact that there are seven sub-fields width identical weight.
  • Fig. 3 a new sub-field organisation according to the invention is shown for 50Hz video standards.
  • the frame period for 60Hz video standards is 16.6ms and for 50Hz 20ms and thus larger for 50Hz video standards. This allows for the addressing of more sub-fields in 50Hz video standards.
  • the number of sub-fields has been increased to 14. This does not cause extra costs since the added time to the frame period is greater than the added number of sub-fields: (20.0/16.6) > (14/12).
  • the sub-fields are structured in two separate sub-field groups G1, G2.
  • One vertical frame blanking period has been replaced by two vertical frame blanking periods VFB1, VFB2, one at the end of the frame period and the other between the two sub-field groups.
  • the 2 sub-field groups are identical in terms of the six most significant sub-fields and different in terms of the least significant sub-field.
  • the weight of the least significant sub-field is small and does not introduce significant large area flicker, and this is the reason why it is not necessary that they are also identical.
  • a sub-field coding process that distributes luminance weight of a given pixel value symmetrically over the 2 sub-field groups is also applied.
  • a small difference in luminance weight between the 2 sub-field groups means a small 50 Hz luminance frequency component, and thus small levels of large area flicker.
  • For the sub-field coding process there is no need of a complicated calculation.
  • a corresponding table where the code words for the 256 different grey levels/pixel values are stored can be used.
  • the first component, 3 (87 mod 4) is the component which is to be coded by the least significant sub-fields of the two sub-field groups.
  • the second and third component which must be multiples of 4 (because of the fact that the six most significant sub-fields in both groups have weights which are multiples of four) are made as equal as possible. If they cannot be made equal, as this is the case with 87 , the second component, to be coded with the sub-fields of group 1, should be made greater by 4.
  • 44 is to be coded with the sub-fields of group G1, and 40 is to be coded with the sub-fields of group 2.
  • the difference in weight between the two sub-field groups is never greater than 5.
  • a second example will be explained with grey level/pixel value 92 .
  • FIG. 4 An apparatus according to the invention is shown in Fig. 4 .
  • the apparatus may be integrated together with the PDP matrix display. It could also be in a separate box which is to be connected with the plasma display panel.
  • Reference no. 10 denotes the whole apparatus.
  • the video signal is fed to the apparatus via the input line V in .
  • Reference no. 11 video processing unit wherein the video signal is digitalized and Y,U, V data is produced.
  • interlace video standards require a previous conversion, here.
  • an YUV/RGB data conversion will be made in this unit as the PDPs work with RGB data.
  • the generated RGB data is forwarded to the sub-field coding unit 12. Therein, to each RGB pixel value the corresponding code word will be selected from a table 13.
  • These code words are forwarded to the frame memory in addressing unit 14 of the PDP 10. With these data the addressing unit 14 controls the plasma display 15.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Claims (10)

  1. Verfahren zum Verarbeiten von Videobildern, insbesondere zur Verringerung des großflächigen Flimmereffekts, wobei das Videobild aus Pixeln besteht, wobei die Pixel digital codiert werden, wobei das digitale Codewort die Länge der Zeitdauer bestimmt, während der das entsprechende Pixel einer Anzeige aktiviert wird, wobei jedem Bit eines digitalen Codeworts eine bestimmte Aktivierungsdauer, im Folgenden Teilfeld (SF) genannt, zugewiesen wird, wobei die Summe der Dauern der Teilfelder (SF) in Übereinstimmung mit einem gegebenen Codewort die Länge der Zeitdauer bestimmt, während der das entsprechende Pixel aktiviert wird, wobei die Teilfelder (SF) eines Pixels in zwei aufeinanderfolgenden Gruppen (G1, G2) organisiert werden und wobei einem Wert eines Pixels ein Codewort zugewiesen wird, das die aktiven Teilfeldperioden über die zwei Teilfeldgruppen (G1, G2) verteilt, dadurch gekennzeichnet, dass für die Erzeugung des Codeworts, das dem Pixelwert zugewiesen wird, der Pixelwert in drei Komponenten geteilt wird, wobei die erste der Pixelwertmodul, die Zahl 4 ist, und die zweite und die dritte Komponente, die Vielfache der Zahl 4 sind, so gleich wie möglich gemacht werden, und wobei die erste Komponente mit den niedrigstwertigen Teilfeldern (SF) beider Gruppen (G1, G2) und die zweite Komponente mit den von dem niedrigstwertigen Teilfeld verschiedenen Teilfeldern (SF) der ersten Gruppe (G1) und die dritte Komponente mit den von dem niedrigstwertigen Teilfeld verschiedenen Teilfeldern der zweiten Gruppe (G2) codiert wird, wobei für 50-Hz-Videonormen wie PAL und SECAM die folgende Teilfeldorganisation verwendet wird;
    die Vollbildperiode wird in 14 Teilfelder (SF) geteilt, wobei dann, wenn die maximale Aktivierungsperiode eines Pixels während einer Vollbildperiode eine relative Dauer von 256 Zeiteinheiten hat, die Teilfelder (SF) der ersten Gruppe (G1) die folgenden Dauern haben: Teilfeldnummer Dauer/relative Zeiteinheiten 1 1 2 4 3 8 4 16 5 24 6 32 7 40
    und die Teilfelder (SF) der zweiten Gruppe (G2) die folgenden Dauern haben: Teilfeldnummer Dauer/relative Zeiteinheiten 1 2 2 4 3 8 4 16 5 24 6 32 7 40
  2. Verfahren nach Anspruch 1, bei dem die Anzahl der Teilfelder in den zwei Teilfeldgruppen (G1, G2) gleich ist.
  3. Verfahren nach Anspruch 2, bei dem jedes der Teilfelder der zwei Teilfeldgruppen (G1, G2) mit Ausnahme einer Anzahl niedrigstwertiger Teilfelder das gleiche Gewicht besitzt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, bei dem das letzte Teilfeld (SF) der ersten Gruppe (G1) von dem ersten Teilfeld (SF) der zweiten Gruppe (G2) durch eine bestimmte Zeitdauer getrennt ist.
  5. Verfahren nach einem der Ansprüche 1 bis 4, bei dem die vertikale Austastperiode (VFB) des Videovollbilds in zwei Teile geteilt wird, wobei sich der erste (VFB1) zwischen dem letzten Teilfeld der ersten Gruppe (G1) und dem ersten Teilfeld der zweiten Gruppe (G2) befindet und der zweite (VFB2) zwischen dem letzten Teilfeld der zweiten Gruppe (G2) und dem ersten Teilfeld der nächsten Vollbildperiode befindet.
  6. Verfahren nach einem der Ansprüche 1 bis 5, bei dem für 50-Hz-Videonormen wie PAL und SECAM, bei denen eine Vollbildperiode 20 ms dauert, das erste Teilfeld der zweiten Gruppe (G2) 10 ms nach dem Beginn der Vollbildperiode startet.
  7. Verfahren nach einem der Ansprüche 1 bis 6, bei dem, falls die zweite und die dritte Komponente nicht gleich gemacht werden können, die zweite Komponente um die Zahl 4 größer als die dritte Komponente gemacht werden sollte.
  8. Vorrichtung zum Verarbeiten von Videobildern, insbesondere zur Verringerung des großflächigen Flimmereffekts, wobei das Videobild aus Pixeln besteht, wobei die Pixel digital codiert sind, wobei das digitale Codewort die Länge der Zeitdauer bestimmt, während der das entsprechende Pixel einer Anzeige aktiviert wird, wobei jedem Bit eines digitalen Codeworts eine bestimmte Aktivierungsdauer, im Folgenden Teilfeld (SF) genannt, entspricht, wobei die Summe der Aktivierungsdauern in Übereinstimmung mit einem gegebenen Codewort die Länge der Zeitdauer bestimmt, während der das entsprechende Pixel in einer Vollbildperiode aktiviert wird, wobei eine Teilfeldorganisation genutzt wird, in der die Teilfelder (SF) eines Pixels in zwei aufeinanderfolgende Gruppen (G1, G2) geteilt sind, und gekennzeichnet durch Teilfeldcodierungsmittel (12, 13), die dafür ausgelegt sind, einem gegebenen Pixelwert ein Codewort zuzuweisen, das die aktiven Teilfeldperioden über die zwei Teilfeldgruppen (G1, G2) gleich verteilt, wobei die Teilfeldcodierungsmittel eine Codetabelle umfassen, in der für alle möglichen Pixelwerte das entsprechende Codewort gespeichert ist, das in Übereinstimmung mit dem Verfahren nach einem der Ansprüche 1 bis 7 codiert wurde.
  9. Vorrichtung nach Anspruch 8, wobei die Vorrichtung eine Matrixanzeige umfasst.
  10. Vorrichtung nach Anspruch 9, wobei die Vorrichtung eine Plasmaanzeige umfasst.
EP99115651A 1998-08-19 1999-08-07 Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung von grossflächigem Flimmereffekt Expired - Lifetime EP0982708B1 (de)

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EP99115651A EP0982708B1 (de) 1998-08-19 1999-08-07 Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung von grossflächigem Flimmereffekt

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Application Number Priority Date Filing Date Title
EP98115607A EP0982707A1 (de) 1998-08-19 1998-08-19 Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung grossflächigen Flimmereffekts
EP98115607 1998-08-19
EP99115651A EP0982708B1 (de) 1998-08-19 1999-08-07 Verfahren und Vorrichtung zur Verarbeitung von Videobildern, insbesondere zur Reduzierung von grossflächigem Flimmereffekt

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EP0982708A1 EP0982708A1 (de) 2000-03-01
EP0982708B1 true EP0982708B1 (de) 2011-05-11

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CN101951490B (zh) * 2009-12-31 2012-09-05 四川虹欧显示器件有限公司 提高显示图像质量的方法、装置和等离子显示器
CN102074185A (zh) * 2009-12-31 2011-05-25 四川虹欧显示器件有限公司 等离子显示器的图像信号的处理方法及装置

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EP0840274A1 (de) * 1996-10-29 1998-05-06 Fujitsu Limited Darstellung von Halbtonbildern

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JPH05127612A (ja) * 1991-11-05 1993-05-25 Nippon Hoso Kyokai <Nhk> 中間調画像表示方法
EP0840274A1 (de) * 1996-10-29 1998-05-06 Fujitsu Limited Darstellung von Halbtonbildern

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