EP1387343B1 - Methode und Vorrichtung zur Vorbehandlung von Video Daten für die Anzeige auf einer Anzeigevorrichtung - Google Patents

Methode und Vorrichtung zur Vorbehandlung von Video Daten für die Anzeige auf einer Anzeigevorrichtung Download PDF

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Publication number
EP1387343B1
EP1387343B1 EP20030102129 EP03102129A EP1387343B1 EP 1387343 B1 EP1387343 B1 EP 1387343B1 EP 20030102129 EP20030102129 EP 20030102129 EP 03102129 A EP03102129 A EP 03102129A EP 1387343 B1 EP1387343 B1 EP 1387343B1
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Prior art keywords
dithering
function
video data
picture
moving object
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Expired - Lifetime
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EP20030102129
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English (en)
French (fr)
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EP1387343A2 (de
EP1387343A3 (de
Inventor
Sebastien Weitbruch
Cedric Thebault
Didier Doyen
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THOMSON LICENSING
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Thomson Licensing SAS
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Priority claimed from EP02291924A external-priority patent/EP1387340A1/de
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Priority to EP20030102129 priority Critical patent/EP1387343B1/de
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Publication of EP1387343A3 publication Critical patent/EP1387343A3/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
    • G09G3/2044—Display of intermediate tones using dithering
    • G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
    • 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
    • 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
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/106—Determination of movement vectors or equivalent parameters within the image
    • 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 present invention relates to a method for processing video data for display on a display device having a plurality of luminous elements by applying a dithering function to at least a part of the video data to refine the grey scale portrayal of video pictures of the video data. Furthermore, the present invention relates to a corresponding device for processing video data including dithering means.
  • a PDP (Plasma Display Panel) utilizes a matrix array of discharge cells, which can only be "ON”, or “OFF". Unlike a CRT or LCD in which grey levels are expressed by analogue control of the light emission, a PDP controls the grey level by modulating the number of light pulses per frame (sustain pulses). This time-modulation will be integrated by the eye over a period corresponding to the eye time response. Since the video amplitude is portrayed by the number of light pulses, occurring at a given frequency, more amplitude means more light pulses and thus more "ON" time. For this reason, this kind of modulation is also known as PWM, pulse width modulation.
  • This PWM is responsible for one of the PDP image quality problems: the poor grey scale portrayal quality, especially in the darker regions of the picture. This is due to the fact, that displayed luminance is linear to the number of pulses, but the eye response and sensitivity to noise is not linear. In darker areas the eye is more sensitive than in brighter areas. This means that even though modern PDPs can display ca. 255 discrete video levels, quantization error will be quite noticeable in the darker areas.
  • a PDP uses PWM (pulse width modulation) to generate the different shades of grey. Contrarily to CRTs where luminance is approximately quadratic to applied cathode voltage, luminance is linear to the number of discharge impulses. Therefore an approximately digital quadratic gamma function has to be applied to video before the PWM.
  • PWM pulse width modulation
  • Dithering is a known technique for avoiding to loose amplitude resolution bits due to truncation.
  • this technique only works if the required resolution is available before the truncation step. Usually this is the case in most applications, since the video data after a gamma operation used for pre-correction of the video signal has 16-bit resolution. Dithering can bring back as many bits as those lost by truncation in principle. However, the dithering noise frequency decreases, and therefore becomes more noticeable, with the number of dithered bits.
  • a quantization step of 1 shall be reduced by dithering.
  • the dithering technique uses the temporal integration property of the human eye.
  • the quantization step may be reduced to 0,5 by using 1-bit dithering. Accordingly, half of the time within the time response of the human eye there is displayed the value 1 and half of the time there is displayed the value 0. As a result the eye sees the value 0,5.
  • the quantization steps may be reduced to 0,25.
  • Such dithering requires two bits. For obtaining the value 0,25 a quarter of the time the value 1 is shown and three quarters of the time the value 0. For obtaining the value 0,5 two quarters of the time the value 1 and two quarters of the time the value 0 is shown. Similarly, the value 0,75 may be generated.
  • quantization steps of 0,125 may be obtained by using 3-bit dithering. This means that 1 bit of dithering corresponds to multiply the number of available output levels by 2, 2 bits of dithering multiply by 4, and 3 bits of dithering multiply by 8 the number of output levels. A minimum of 3 bits of dithering may be required to give to the grey scale portrayal a 'CRT' look.
  • the dithering most adapted to PDP until now is the Cell-Based Dithering, described in the European patent application EP-A-1 136 974 and Multi-Mask dithering described in the European patent application with the filing number 01 250 199.5 , which improves grey scale portrayal but adds high frequency low amplitude dithering noise. It is expressively referred to both documents.
  • Cell-based dithering adds a temporal dithering pattern that is defined for every panel cell and not for every panel pixel as shown in Fig. 1 .
  • a panel pixel is composed of three cells: red, green and blue cell. This has the advantage of rendering the dithering noise finer and thus less noticeable to the human viewer.
  • the dithering pattern is defined cell-wise, it is not possible to use techniques like error-diffusion, in order to avoid colouring of the picture when one cell would diffuse in the contiguous cell of a different colour. This is not a big disadvantage, because it has been observed sometimes an undesirable low frequency moving interference, between the diffusion of the truncation error and a moving pattern belonging to the video signal. Error diffusion works best in case of static pictures. Instead of using error diffusion, a static 3-dimensional dithering pattern is proposed.
  • This static 3-dimentional dithering is based on a spatial (2 dimensions x and y) and temporal (third dimension t) integration of the eye.
  • the matrix dithering can be represented as a function with three variables: ⁇ (x,y,t).
  • the three parameters x, y and t will represent a kind of phase for the dithering. Now, depending on the number of bits to be rebuilt, the period of these three phases can evolve.
  • Figure 2 illustrates the 3-dimensional matrix concept.
  • the values displayed on the picture slightly change for each plasma cell in the vertical and horizontal directions. In addition, the value also changes for each frame.
  • the spatial resolution of the eye is good enough to be able to see a fixed static pattern A, B, A, B but if a third dimension, namely the time, is added in the form of an alternating function, then the eye will be only able to see the average value of each cell.
  • the human eye While displaying moving objects on the plasma screen, the human eye will follow the objects and no more integrates the same cell of the plasma (PDP) over the time. In that case, the third dimension will no more work perfectly and a dithering pattern can be seen.
  • PDP plasma
  • the third dimension aspect of the dithering will not work correctly and only the spatial dithering will be available. Such an effect will make the dithering more or less visible depending on the movement.
  • the dithering pattern is no longer hidden by the spatial and temporal eye integration.
  • a method and system for digital signal translation wherein the value of a data word is dithered over time such that the average value of the data word is an approximation of the desired value of the data word and for increasing the apparent dynamic range of a display system is already known from EP-A-0 656 616 and BECK DEPARTMENT OF ELECTRICAL ENGINEERING D R ET AL already disclosed " Motion Dithering for Increasing Perceived Image Quality for Low-Resolution Displays" on the SID INTERNATIONAL SYMPOSIUM in DIGEST OF TECHNICAL PAPERS., vol. 29, 13 July 1998 (1998-07-13), pages 407-410 , XP007008628 Santa Anaheim, CA, USA. Furthermore, Differential image data compression systems and techniques are known from WO 9111 0324 A ( PCT/US90/07685 ).
  • the dithering function or pattern has two spatial dimensions and one temporal dimension.
  • Such a dithering function enables an enhanced reduction of quantization steps in the case of static pictures compared to error diffusion.
  • the dithering function may be based on a plurality of masks.
  • different dither patterns may be provided for different entries in a number of least significant bits of the data word representing the input video level. This makes it possible to suppress the disturbing patterns occurring on the plasma display panel when using the conventional dither patterns.
  • the application of the dithering function or pattern may be based on single luminous elements called cells of the display device. I.e. to each colour component R, G, B of a pixel separate dithering numbers may be added.
  • Such cell based dithering has the advantage of rendering the dithering noise finer and thus making it less noticeable to the human viewer.
  • the dithering may be performed by a 1-, 2-, 3-, and/or 4-bit function.
  • the number of bits used depends on the processing capability. In general 3- bit dithering is enough so that most of the quantization noise is not visible.
  • the motion vector is computed for each pixel individually.
  • the quality of higher resolution dithering can be enhanced compared to a technique where the motion vector is computed for a plurality of pixels or a complete area.
  • the motion vector should be computed for both spatial dimensions x and y.
  • any movement of an object observed by the human viewer may be regarded for the dithering process.
  • the temporal component of the dithering function may be introduced by controlling the dithering in the rhythm of picture frames. Thus, no additional synchronisation has to be provided.
  • the dithering according to the present invention may be based on a Cell-based and/or Multi-Mask dithering, which consists in adding a dithering signal that is defined for every plasma cell and not for every pixel.
  • a dithering may further be optimized for each video level. This makes the dithering noise finer and less noticeable to the human viewer.
  • the adaptation of the dithering pattern to the movement of the picture in order to suppress the dithering structure appearing for specific movement may be obtained by using a motion estimator to change the phase or other parameters of the dithering function for each cell. In that case, even if the eye is following the movement, the quality of the dithering will stay constant and a pattern of dithering in case of motion will be suppressed. Furthermore, this invention can be combined with any kind of matrix dithering.
  • this vector can be used to change the phase of the dithering according to the formula: ⁇ ⁇ x o - V x x o ⁇ y o , y o - V y x o ⁇ y o , t o .
  • the new dithering pattern will depend on five parameters and can be defined as following: ⁇ x o , y o , V x x o ⁇ y o , V y x o ⁇ y o , t .
  • a big advantage of such a motion compensated dithering is its robustness regarding the motion vector.
  • the role of the motion vectors is to avoid any visible pattern of the dithering during a movement that suppresses the temporal integration of the eye. Even if the motion vectors are not exact, they can suppress the pattern.
  • this vector is used to change the phase of the dithering according to the formula : ⁇ ⁇ x o - f x x o ⁇ y o ⁇ t o , y o - f y x o ⁇ y o ⁇ t o , t o
  • ⁇ represents the period of the dithering and mod( ⁇ ) the function modulo ⁇ .
  • ⁇ represents the period of the dithering and mod( ⁇ ) the function modulo ⁇ .
  • the new dithering pattern will depend on five parameters and can be defined as following : ⁇ (x o ,y o ,v x (x o ,y o ,t),v y (x o ,y o ,t),t).
  • the vectors used are taken from more than one frame.
  • 3-bit dithering is implemented so that up to 8 frames are used for dithering. If the number of frames used for dithering is increased, the frequency of the dithering might be too low, and so flicker will appear.
  • Mainly 3-bit dithering is rendered with a 4-frames cycle and a 2D spatial component.
  • FIG. 3 illustrates a possible implementation for the algorithm.
  • RGB input pictures indicated by the signals R 0 , G 0 and B 0 are forwarded to a gamma function block 10. It can consist of a look up table (LUT) or it can be formed by a mathematical function.
  • the outputs R 1 , G 1 and B 1 of the gamma function block 10 are forwarded to a dithering block 12 which takes into account the pixel position and the frame parity as temporal component for the computation of the dithering value.
  • the frame parity is based on the frame number within one dithering cycle. For instance, within a 3-bit dithering based on a 4-frames cycle the frame number changes cyclically from 0 to 3.
  • the input picture R 0 , G 0 and B 0 is also forwarded to a motion estimator 14, which will provide, for each pixel, a motion vector (V x , V y ).
  • This motion vector will be additionally used by the dithering block 12 for computing the dithering pattern.
  • the video signals R 1 , G 1 , B 1 subjected to the dithering in the dithering block 12 are output as signals R2, G2, B2 and are forwarded to a sub-field coding unit 16 which performs sub-field coding under the control of the control unit 18.
  • the plasma control unit 18 provides the code for the sub-field coding unit 16 and the dithering pattern DITH for the dithering block 12.
  • the sub-field signals for each colour output from the sub-field coding unit 16 are indicated by reference signs SF R , SF G, SF B .
  • these sub-field code words for one line are all collected in order to create a single very long code word which can be used for the linewise PDP addressing. This is carried out in a serial to parallel conversion unit 20 which is itself controlled by the plasma control unit 18.
  • control unit 18 generates all scan and sustain pulses for PDP control. It receives horizontal and vertical synchronizing signals for reference timing.
  • Figure 4 illustrates a modification of the embodiment of figure 3 .
  • a frame memory is used at the dithering block level.
  • the additional memory requirements are not so strong since the value to be stored is modulo ⁇ , which is mainly around 4 for standard dithering in order to limit the temporal visibility of the dithering (low frequency).
  • Motion compensated dithering is applicable to all colour cell based displays (for instance colour LCDs) where the number of resolution bits is limited.
  • the present invention brings the advantages of suppressing the visible pattern of classical matrix dithering in case of moving pictures and of strong robustness regarding the motion vector field.

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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)
  • Control Of Gas Discharge Display Tubes (AREA)

Claims (16)

  1. Verfahren zum Verarbeiten von Videodaten (R0, G0, B0) zur Anzeige auf einer Anzeigevorrichtung, die eine Vielzahl von Leuchtelementen aufweist, durch
    Anwenden einer Dithering-Funktion auf mindestens einen Teil der Videodaten (R0, G0, B0), um die Graustufendarstellung von Videobildern der Videodaten zu verfeinern,
    gekennzeichnet durch
    Berechnen von mindestens einem Bewegungsvektor, der die Bewegung eines sich bewegenden Objektes auf einem Bild darstellt, ausgehend von den Videodaten (R0, G0, B0), und
    Verändern der Phase, Amplitude, räumlichen Auflösung und/oder der zeitlichen Auflösung der Dithering-Funktion in Übereinstimmung mit dem mindestens einen Bewegungsvektor, der die Bewegung eines sich bewegenden Objektes auf einem Bild darstellt, wenn die Dithering-Funktion auf die Videodaten (R0, G0, B0) angewendet wird, um ein Dithering-Muster zu beseitigen, das für einen Betrachter sichtbar wird, der das sich bewegende Objekt auf einem Bild betrachtet, wenn seine Augen der Bewegung folgen.
  2. Verfahren nach Anspruch 1, wobei die Dithering-Funktion zwei räumliche Dimensionen und eine zeitliche Dimension enthält.
  3. Verfahren nach Anspruch 1 oder 2, wobei die Dithering-Funktion die Anwendung von einer Vielzahl von Masken enthält.
  4. Verfahren nach Anspruch 1 oder 2, wobei das Anwenden der Dithering-Funktion auf einzelnen Leuchtelementen, Zellen der Anzeigevorrichtung genannt, beruht.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Dithering-Funktion aus einer 1-, 2-, 3- und/oder 4-Bit Dithering-Funktion besteht.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei der mindestens eine Bewegungsvektor, der ein sich bewegendes Objekt auf einem Bild darstellt, individuell für jedes Pixel oder jede Zelle definiert wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei der mindestens eine Bewegungsvektor, der ein sich bewegendes Objekt auf einem Bild darstellt, zwei räumliche Dimensionen aufweist.
  8. Vorrichtung zum Verarbeiten von Videodaten (R0, G0, B0) zur Anzeige auf einer Anzeigevorrichtung, die eine Vielzahl von Leuchtelementen aufweist, Dithering-Mittel (12) zum Anwenden einer Dithering-Funktion auf mindestens einen Teil der Videodaten (R0, G0, B0) umfassend, um die Graustufendarstellung von Videobildern der Videodaten (R0, G0, B0) zu verfeinern,
    gekennzeichnet durch
    Bewegungsschätzungsmittel (14), die mit den Dithering-Mitteln (12) zum Berechnen von mindestens einem Bewegungsvektor verbunden sind, der die Bewegung eines sich bewegenden Objektes auf einem Bild (Vx, Vy) darstellt, ausgehend von den Videodaten (R0, G0, B0), wobei die Phase, Amplitude, räumliche Auflösung und/oder zeitliche Auflösung der Dithering-Funktion in Übereinstimmung mit dem mindestens einen Bewegungsvektor, der die Bewegung eines sich bewegenden Objektes auf einem Bild (Vx, Vy) darstellt, veränderbar ist, um ein Dithering-Muster zu beseitigen, das für einen Betrachter sichtbar wird, der das sich bewegende Objekt auf einem Bild betrachtet, wenn seine Augen der Bewegung folgen.
  9. Vorrichtung nach Anspruch 8, wobei die Dithering-Funktion, die durch die Dithering-Mittel (12) verwendet wird, zwei räumliche Dimensionen und eine zeitliche Dimension enthält.
  10. Vorrichtung nach Anspruch 8 oder 9, wobei die Dithering-Funktion der Dithering-Mittel (12) auf einer Vielzahl von Masken beruht.
  11. Vorrichtung nach Anspruch 8 oder 9, wobei die Dithering-Funktion der Dithering-Mittel (12) auf einzelnen Leuchtelementen, Zellen der Anzeigevorrichtung genannt, beruht.
  12. Vorrichtung nach einem der Ansprüche 8 bis 11, wobei die Dithering-Mittel (12) in der Lage sind, eine 1-, 2-, 3-, und/oder 4-Bit Dithering-Funktion zu verarbeiten.
  13. Vorrichtung nach einem der Ansprüche 8 bis 12, wobei der mindestens eine Bewegungsvektor, der ein sich bewegendes Objekt auf einem Bild (Vx, Vy) darstellt, durch die Bewegungsschätzungsmittel (14) individuell für jedes Pixel definiert werden kann.
  14. Vorrichtung nach einem der Ansprüche 8 bis 13, wobei der mindestens eine Bewegungsvektor, der ein sich bewegendes Objekt auf einem Bild (Vx, Vy) darstellt, zwei räumliche Dimensionen enthält.
  15. Vorrichtung nach einem der Ansprüche 8 bis 14, ferner Gammafunktionsmittel (10) umfassend, die mit den Dithering-Mitteln (12) dergestalt verbunden sind, dass die Eingangssignale der Dithering-Mittel (12) durch eine Gammafunktion vorkorrigiert werden.
  16. Vorrichtung nach einem der Ansprüche 8 bis 15, ferner Steuerungsmittel (18) umfassend, die mit den Dithering-Mitteln (12) verbunden sind, um die Dithering-Mittel (12) zeitlich in Abhängigkeit von Rahmen der Videodaten (R0, G0, B0) zu steuern.
EP20030102129 2002-07-30 2003-07-11 Methode und Vorrichtung zur Vorbehandlung von Video Daten für die Anzeige auf einer Anzeigevorrichtung Expired - Lifetime EP1387343B1 (de)

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EP02291924A EP1387340A1 (de) 2002-07-30 2002-07-30 Verfahren und Einrichtung zur Videodatenbearbeitung für eine Anzeigevorrichtung
EP22919245 2002-07-30
EP20030102129 EP1387343B1 (de) 2002-07-30 2003-07-11 Methode und Vorrichtung zur Vorbehandlung von Video Daten für die Anzeige auf einer Anzeigevorrichtung

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WO2012000136A1 (en) 2010-07-02 2012-01-05 Thomson Broadband R&D (Beijing) Co., Ltd. Method for measuring video quality using a reference, and apparatus for measuring video quality using a reference

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CA2048623A1 (en) * 1989-12-28 1991-06-29 Robert L. Harvey Video telephone systems
CA2137061A1 (en) * 1993-12-02 1995-06-03 Stephen W. Marshall Technique to increase the apparent dynamic range of a visual display
US6288698B1 (en) * 1998-10-07 2001-09-11 S3 Graphics Co., Ltd. Apparatus and method for gray-scale and brightness display control
EP1136974A1 (de) * 2000-03-22 2001-09-26 Deutsche Thomson-Brandt Gmbh Videobilddatenverarbeitungsverfahren für eine Anzeigevorrichtung

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