EP1100068A2 - Apparatus for improving imaging on a display device - Google Patents

Apparatus for improving imaging on a display device Download PDF

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Publication number
EP1100068A2
EP1100068A2 EP00123963A EP00123963A EP1100068A2 EP 1100068 A2 EP1100068 A2 EP 1100068A2 EP 00123963 A EP00123963 A EP 00123963A EP 00123963 A EP00123963 A EP 00123963A EP 1100068 A2 EP1100068 A2 EP 1100068A2
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EP
European Patent Office
Prior art keywords
signal
image
display
picture
der
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Granted
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EP00123963A
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German (de)
French (fr)
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EP1100068B1 (en
EP1100068A3 (en
Inventor
Udo Grundig AG Fischbeck
Markus Grundig AG Friebe
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Grundig Multimedia BV
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Grundig AG
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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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers

Definitions

  • the invention relates to a device for improving the image display a display.
  • a display with a further, higher resolution can in the simplest case increases the number of pixels in both the horizontal and vertical directions, for example, doubled.
  • an interpolation of the image signal can take place for this purpose.
  • a disadvantage of such an interpolation is that when hard Transitions or when there are steep signal edges in the image signal of the low resolution generated by the interpolation process intermediate stages be blurred in the reproduced image in the form of blurred Edges are visible.
  • DE-A-197 14 906 describes a method for improving the image resolution Color rendering devices known.
  • People exists with these devices conventional elementary color point from several to one unit formatted color pixels. From the color pixels of the conventional elementary Color dots are temporarily formed new additional color dots whose Color centers lie outside the color centers of the conventional color dots.
  • the images are made up of conventional color dots and these Images derived from images from additional color dots in quick succession excited one after the other.
  • the object of the invention Reason to show a device that the image representation on a Improved display of higher resolution, if there is more input Low resolution image signals.
  • the advantages of the invention are, in particular, that depending one of the current image content and the history of the image A decision is made as to whether a transition occurs Interpolation process carried out and thus in the image with higher resolution smooth transition is created or whether in the image with higher resolution a hard transition occurs.
  • This procedure also allows in the picture higher resolution to take account of the image content and natural Make transitions smooth and hard transitions, for example in the picture side lines of a tennis court running diagonally from top to bottom, hard to represent, i.e. do not perform interpolation.
  • Including the history of the image can affect the quality of the image display can be significantly improved on the display.
  • FIG. 1 shows a block diagram of a device according to the invention.
  • This image signal is fed to an interpolator 2 arranged in a first signal path and to a delay circuit 3 arranged in a second signal path arranged parallel to the first.
  • An image signal with a second resolution, which is higher than the first resolution, is available at the output of the interpolator 2 and at the output of the delay circuit 3.
  • the output signal of the interpolator 2 is fed to a terminal a of a switch 6.
  • the output signal of the delay circuit 3 is forwarded to the terminal b of the switch 6.
  • the switch 6 is either in the switch control signal S1 Switch position a or in switch position b and is therefore either for the output signal of the interpolator 2 or for the output signal of the Delay circuit 3 permeable.
  • the output signal of the switch 6, which is an image signal with the second, higher resolution, is fed to a display 7 and there shown.
  • This display is, for example, an LCD display.
  • a computing unit 4 is used to generate the switch control signal S1 provided that furthermore a control signal S2 for the delay circuit 3 and provides a control signal S3 for the interpolator 2.
  • the computing unit also stands with a memory 5 in connection.
  • the image signal is analyzed in the computing unit 4 using the first one Release. As part of this analysis, in particular in the image signal existing transitions or flanks recognized.
  • the computing unit takes care of it continue to store information about in the image signal Transitions occurring in the memory 5. In particular, data which saved the coordinates of the transition in the respective image and also the direction of the transition (light - dark or dark - light) and continues mark the course of an edge in the image.
  • the computing unit 4 uses the current ones and those already stored Information about the transitions present in the image signal to determine the Control signals S1. S2 and S3.
  • the information already saved about Transitions present in the image signal can be transitions that are in already transmitted image sections of the current field or full frame, or transitions that were detected in previous fields or frames, or both of the aforementioned transition types.
  • Figure 2 shows a diagram illustrating a soft Transition.
  • the signal curve E corresponds to that at input 1 applied image signal, the signal curve D at the output of the switch 6 provided image signal, which is shown on the display 7.
  • the Input signal E has a smooth transition, which is characterized by a low jump is symbolized.
  • the signal D derived therefrom, which on the display 7 is shown in this case by the interpolator determined. This has the consequence that due to the interpolation process in Signal D, which has a higher resolution than signal E, there is an intermediate stage on the basis of which this is shown on the display 7 represented signal a soft. natural transition.
  • Figure 3 shows a diagram illustrating a hard Transition.
  • the signal curve E corresponds to that at input 1 applied image signal, the signal curve D at the output of the switch 6 provided image signal, which is shown on the display 7.
  • the Input signal E has a hard transition, which is caused by a high jump is symbolized.
  • the signal D derived therefrom, which on the display 7 is shown, in this case by means of Delay circuit 3 generated.
  • the im Input signal existing transition not through an interpolation process is polished, but remains, and as a hard jump also in the signal D, which is shown on the display, occurs.
  • the signal D is only delayed compared to the signal E, this delay being chosen so that, on the one hand, the processing time in the computing unit 4, on the other hand is also adapted to the processing time in the interpolator 2 and History of the image content the correct temporally / geometrically correct position is determined.

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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)
  • Controls And Circuits For Display Device (AREA)
  • Processing Or Creating Images (AREA)
  • Picture Signal Circuits (AREA)
  • Studio Devices (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

The image enhancement device has the image signal input (1) coupled to 2 different signal paths respectively containing an interpolator (2) and a delay device (3), each providing an image signal with a higher resolution, fed to a switching stage (6) which supplies one or other of the enhanced signals to the display (7), in dependence on a switching control signal (S1). This is provided by a processor (4) coupled to the signal input for evaluating the image content.

Description

Die Erfindung betrifft eine Vorrichtung zur Verbesserung der Bilddarstellung auf einem Display.The invention relates to a device for improving the image display a display.

Zu einer Darstellung von Bildsignalen einer ersten, niedrigen Auflösung auf einem Display mit einer weiteren, höheren Auflösung kann im einfachsten Fall die Pixelzahl sowohl in horizontaler als auch in vertikaler Richtung erhöht, beispielsweise verdoppelt, werden.For displaying image signals of a first, low resolution a display with a further, higher resolution can in the simplest case increases the number of pixels in both the horizontal and vertical directions, for example, doubled.

Weiterhin kann zu diesem Zweck eine Interpolation des Bildsignals erfolgen. Nachteilig bei einer derartigen Interpolation ist, daß beim Vorliegen von harten Übergängen bzw. beim Vorliegen von steilen Signalflanken im Bildsignal der niedrigen Auflösung durch den Interpolatinsvorgang Zwischenstufen erzeugt werden, die im wiedergegebenen Bild in Form von verwaschenen unscharfen Kanten sichtbar sind.Furthermore, an interpolation of the image signal can take place for this purpose. A disadvantage of such an interpolation is that when hard Transitions or when there are steep signal edges in the image signal of the low resolution generated by the interpolation process intermediate stages be blurred in the reproduced image in the form of blurred Edges are visible.

Aus DE-A-197 14 906 ist ein Verfahren zur Verbesserung der Bildauflösung bei Farbwiedergabegeräten bekannt. Bei diesen Geräten besteht jeder herkömmliche elementare Farbpunkt aus mehreren zu einer Einheit formartierten Farbpixeln. Aus den Farbpixeln der herkömmlichen elementaren Farbpunkte werden zeitweilig neue zusätzliche Farbpunkte gebildet, deren Farbzentren außerhalb der Farbzentren der herkömmlichen Farbpunkte liegen. Hierbei werden die Bilder aus herkömmlichen Farbpunkten und aus diesen Bildern abgeleitete Bilder aus zusätzlichen Farbpunkten in schneller Folge nacheinander erregt. DE-A-197 14 906 describes a method for improving the image resolution Color rendering devices known. Everyone exists with these devices conventional elementary color point from several to one unit formatted color pixels. From the color pixels of the conventional elementary Color dots are temporarily formed new additional color dots whose Color centers lie outside the color centers of the conventional color dots. The images are made up of conventional color dots and these Images derived from images from additional color dots in quick succession excited one after the other.

Aus EP-B-0 457 329 ist eine flüssige Kristallanzeigevorrichtung bekannt. Diese Anzeigevorrichtung besteht aus

  • einer ersten A/D-Wandlereinrichtung zum Abtasten eines analogen Bildeingangssignals nach dem Erzeugen eines ersten Abtasttaktes und zum Umwandeln dieses Signals in erste digitale Abstufungsdaten;
  • einer zweiten A/D-Wandlereinrichtung zum Abtasten des analogen Bildeingangsignals nach dem Erzeugen eines zweiten Abtasttaktes mit derselben Periode und zum Umwandeln dieses Signals in zweite digitale Abstufungsdaten;
  • einer mit dem Ausgang der ersten A/D-Wandlereinrichtung verbundenen Verzögerungseinrichtung zum Verzögern der ersten digitalen Abstufungsdaten um etwa eine halbe Periode des ersten Abtasttaktes;
  • einer mit den Ausgängen der ersten A/D-Wandlereinrichtung und der Verzögerungseinrichtung verbundenen Selektionsschaltereinrichtung zum Selektieren und Ausgeben eines Ausgangssignals von diesen als Reaktion auf Selektionssteuersignal;
  • einer Signalverarbeitungseinrichtung, die in Paarform digitaler Abstufungsdaten mit den Ausgangssignalen der Selektionsschaltereinrichtung und der zweiten A/D-Wandlereinrichtung versorgt wird, um diese in analoge Werte zum Ausgeben eines Paares analoger Abstufungsdaten umzuwandeln;
  • einer Anzeigetafeleinrichtung mit mehreren Zeilenleitungen, mehreren Spaltenleitungen und diesen entsprechend angeordneten Bildelementen, um eine Abstufungsanzeige als Reaktion auf analoge Abstufungsdaten, welche an jedes von den Spaltenleitungen und Zeilenleitung selektiertes Bildelement geliefert werden, bereitzustellen;
  • einer mit dem Paar analoger Abstufungsdatenanteile in einer sequentiellen Reihenfolge versorgten Source-Treibereinrichtung, zum Umwandeln dieser in parallele Paare analoger Abstufungsdatenanteile für jede vorgegebene Paaranzahl und Liefern dieser an die entsprechenden Spalten und Zeilen der Anzeigetafel;
  • einer Gate-Treibereinrichtung zum selektiven Ansteuern der mehreren Zeilenleitungen der Anzeigetafel; und
  • einer Steuereinrichtung, wodurch in einem Doppelauflösungsanzeigenmodus der erste und der zweite Abtasttakt erzeugt werden, nachdem sie um 180° in der Phase verschoben wurden, und das Selektionssteuersignal zum Steuern der Selektionsschaltereinrichtung erzeugt wird, um das Ausgangssignal der Verzögerungseinrichtung zu selektieren, und in einem Standardauflösungsanzeigemodus der erste und der zweite Abtasttakt gleichphasig zueinander erzeugt werden und das Selektionssteuersignal zum Steuern des Selektionsschalters erzeugt wird, um das Ausgangssignal der ersten A/D-Wandlereinrichtung zu selektieren.
A liquid crystal display device is known from EP-B-0 457 329. This display device consists of
  • a first A / D converter means for sampling an analog image input signal after generating a first sampling clock and for converting this signal into first digital gradation data;
  • second A / D converter means for sampling the analog image input signal after generating a second sampling clock having the same period and converting this signal into second digital gradation data;
  • delay means connected to the output of the first A / D converter means for delaying the first digital gradation data by about half a period of the first sampling clock;
  • selection switch means connected to the outputs of the first A / D converter means and the delay means for selecting and outputting an output signal therefrom in response to the selection control signal;
  • a signal processing device which is supplied in pair form of digital gradation data with the output signals of the selection switch device and the second A / D converter device in order to convert them into analog values for outputting a pair of analog gradation data;
  • a display panel device having a plurality of row lines, a plurality of column lines and picture elements arranged corresponding thereto to provide a gradation display in response to analog gradation data supplied to each picture element selected by the column lines and row line;
  • a source driver provided with the pair of analog gradation data portions in a sequential order, for converting them into parallel pairs of analog gradation data portions for each predetermined number of pairs and supplying them to the corresponding columns and rows of the display panel;
  • gate driver means for selectively driving the plurality of row lines of the display panel; and
  • a controller which generates the first and second sampling clocks after being shifted 180 degrees in phase in a double-resolution display mode and generates the selection control signal for controlling the selection switch device to select the delay device output signal, and which in a standard resolution display mode the first and the second sampling clock are generated in phase with each other and the selection control signal for controlling the selection switch is generated in order to select the output signal of the first A / D converter device.

Aus EP-0-439 714 ist ein Antialiasingverfahren für Rastbilder, welche aus einer Rechnerumsetzung eines ursprünglichen Rastbildes in ein sich daraus ergebendes Rasterbild resultieren, bekannt. Das neue Rasterbild weist hierbei eine größere Anzahl von Bildelementen auf, als das ursprüngliche Rastbild, wobei das Verfahren die folgenden Schritte umfaßt:

  • a) in dem ursprünglichen Bild definieren von Bildelementegruppen zu je vier Bildelementen, die an Schnittpunkten aufeinandertreffen,
  • b) definieren eines rechteckigen Bereichs durch die Mittelpunkte der vier Bildelemente des ursprünglichen Bildes, wobei der rechteckige Bereich in acht dreieckige Bereiche unterteilt wird und vier der dreieckigen Bereiche einen inneren rechteckigen Bereich bilden, der innerhalb des definierten rechteckigen Bereichs zentriert ist, und vier der dreieckigen Bereiche dreieckige Außenbereiche bilden, die an die dreieckigen Bereiche des inneren rechteckigen Bereichs angrenzen,
    • und durch die folgenden Schritte gekennzeichnet ist:
  • c) zuordnen einer Farbe zu jedem der vier dreieckigen Außenbereiche des ursprünglichen Rasterbildes, die gleich ist wie die Farbe der benachbarten Viererpixelgruppe in dem ursprünglichen Bild;
  • d) wenn genau ein Paar von diagonal entgegengesetzten Bereichen der dreieckigen Außenbereiche dieselbe Farbe hat, Zuordnen dieser Farbe zu allen der dreieckigen Bereiche des inneren rechteckigen Bereichs, ansonsten Zuordnen derselben Farbe, die der benachbarte dreieckige Außenbereich hat, zu jedem dreieckigen Bereich des inneren rechteckigen Bereichs;
  • e) Zuordnen eines jeden der dreieckigen Bereiche des ursprünglichen Rasterbildes zu ausgewählten Bildelementen des resultierenden Bildes und Zuordnen der Farben, die durch den Schritt d) den dreieckigen Bereichen des ursprünglichen Rasterbildes zugeordnet wurden, zu den entsprechenden der ausgewählten Bildelemente des resultierenden Rasterbildes.
    •  From EP-0-439 714 an anti-aliasing method for raster images, which result from a computer conversion of an original raster image into a raster image resulting therefrom, is known. The new raster image has a larger number of picture elements than the original raster image, the method comprising the following steps:
  • a) in the original image define groups of picture elements of four picture elements each, which meet at intersection points,
  • b) define a rectangular area through the centers of the four picture elements of the original image, the rectangular area being divided into eight triangular areas and four of the triangular areas forming an inner rectangular area centered within the defined rectangular area and four of the triangular areas Areas form triangular outer areas which adjoin the triangular areas of the inner rectangular area,
    • and is characterized by the following steps:
  • c) assigning a color to each of the four triangular outer areas of the original raster image which is the same as the color of the adjacent group of four pixels in the original image;
  • d) if exactly one pair of diagonally opposite areas of the triangular outer area has the same color, assign this color to all of the triangular areas of the inner rectangular area, otherwise assign the same color as the adjacent triangular outer area to each triangular area of the inner rectangular area ;
  • e) assigning each of the triangular areas of the original raster image to selected picture elements of the resulting image and assigning the colors assigned by step d) to the triangular areas of the original raster picture to the corresponding ones of the selected picture elements of the resulting raster picture.

    • Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zu Grunde, eine Vorrichtung aufzuzeigen, welche die Bilddarstellung auf einem Display höherer Auflösung verbessert, bei Vorliegen eingangsseitiger Bildsignale niedriger Auflösung.Based on this state of the art, the object of the invention Reason to show a device that the image representation on a Improved display of higher resolution, if there is more input Low resolution image signals.

    Diese Aufgabe wird durch eine Vorrichtung mit den im Anspruch 1 angegebenen Merkmalen gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is achieved by a device with the in claim 1 specified features solved. Advantageous configurations and Further developments of the invention are the subject of the dependent claims.

    Die Vorteile der Erfindung bestehen insbesondere darin, daß in Abhängigkeit vom vorliegenden Bildinhalt und der Historie des Bildes automatisch eine Entscheidung dahingehend getroffen wird, ob an auftretenden Übergängen ein Interpolationsvorgang durchgeführt und damit im Bild mit höherer Auflösung ein weicher Übergang geschaffen wird oder ob auch im Bild mit höherer Auflösung ein harter Übergang auftritt. Diese Vorgehensweise erlaubt es, auch im Bild mit höherer Auflösung dem Bildinhalt Rechnung zu tragen und natürliche Übergänge weich darzustellen und harte Übergänge, beispielsweise im Bild schräg von oben nach unten verlaufende Seitenlinien eines Tennisplatzes, hart darzustellen, d.h. keine Interpolation durchzuführen. Durch die genannte Einbeziehung der Historie des Bildes kann dabei die Qualität der Bilddarstellung auf dem Display wesentlich verbessert werden.The advantages of the invention are, in particular, that depending one of the current image content and the history of the image A decision is made as to whether a transition occurs Interpolation process carried out and thus in the image with higher resolution smooth transition is created or whether in the image with higher resolution a hard transition occurs. This procedure also allows in the picture higher resolution to take account of the image content and natural Make transitions smooth and hard transitions, for example in the picture side lines of a tennis court running diagonally from top to bottom, hard to represent, i.e. do not perform interpolation. By the named Including the history of the image can affect the quality of the image display can be significantly improved on the display.

    Weitere vorteilhafte Eigenschaften der Erfindung ergeben sich aus der Erläuterung eines Ausführungsbeispiels anhand der Figuren. Es zeigt:

    FIG 1
    ein Blockschaltbild einer Vorrichtung gemäß der Erfindung,
    FIG 2
    ein Diagramm zur Veranschaulichung eines weichen Übergangs, und
    FIG 3
    ein Diagramm zur Veranschaulichung eines harten Übergangs.
    Further advantageous properties of the invention result from the explanation of an embodiment using the figures. It shows:
    FIG. 1
    2 shows a block diagram of a device according to the invention,
    FIG 2
    a diagram illustrating a smooth transition, and
    FIG 3
    a diagram illustrating a hard transition.

    Die Figur 1 zeigt ein Blockschaltbild einer Vorrichtung gemäß der Erfindung. An deren Eingang 1 steht ein Eingangssignal E zur Verfügung, welches einem Bildsignal mit einer ersten Auflösung entspricht. Beispielsweise handelt es sich um ein Bildsignal mit 680 Pixeln in Horizontalrichtung und 525 Pixeln in Vertikalrichtung.FIG. 1 shows a block diagram of a device according to the invention. On whose input 1 is an input signal E available, which one Image signal with a first resolution corresponds. For example, it is around an image signal with 680 pixels in the horizontal direction and 525 pixels in Vertical direction.

    Dieses Bildsignale wird einem in einen ersten Signalweg angeordneten Interpolator 2 und einer in einem zweiten, parallel zum ersten angeordneten Signalweg gelegenen Verzögerungsschaltung 3 zugeführt. Am Ausgang des Interpolators 2 und am Ausgang der Verzögerungsschaltung 3 steht jeweils ein Bildsignal mit einer zweiten Auflösung zur Verfügung, welche höher ist als die erste Auflösung.
    Das Ausgangssignal des Interpolators 2 wird einer Klemme a eines Schalters 6 zugeführt. Das Ausgangssignal der Verzögerungsschaltung 3 wird an die Klemme b des Schalters 6 weitergeleitet.    This image signal is fed to an interpolator 2 arranged in a first signal path and to a delay circuit 3 arranged in a second signal path arranged parallel to the first. An image signal with a second resolution, which is higher than the first resolution, is available at the output of the interpolator 2 and at the output of the delay circuit 3.
    The output signal of the interpolator 2 is fed to a terminal a of a switch 6. The output signal of the delay circuit 3 is forwarded to the terminal b of the switch 6.

    Der Schalter 6 wird von einem Schaltersteuersignal S1 entweder in die Schaltstellung a oder in die Schaltstellung b gebracht und ist damit entweder für das Ausgangssignal des Interpolators 2 oder für das Ausgangssignal der Verzögerungsschaltung 3 durchlässig.The switch 6 is either in the switch control signal S1 Switch position a or in switch position b and is therefore either for the output signal of the interpolator 2 or for the output signal of the Delay circuit 3 permeable.

    Das Ausgangssignal des Schalters 6, bei dem es sich um ein Bildsignal mit der zweiten, höheren Auflösung handelt, wird einem Display 7 zugeführt und dort dargestellt. Bei diesem Display handelt es sich beispielsweise um eine LCD-Anzeige. The output signal of the switch 6, which is an image signal with the second, higher resolution, is fed to a display 7 and there shown. This display is, for example, an LCD display.

    Zur Erzeugung des Schaltersteuersignals S1 ist eine Recheneinheit 4 vorgesehen, die weiterhin ein Steuersignal S2 für die Verzögerungsschaltung 3 und ein Steuersignal S3 für den Interpolator 2 zur Verfügung stellt. Dem Eingang der Recheneinheit 4, die vorzugsweise in Form eines Mikrocomputers realisiert ist, wird das am Eingang 1 der Vorrichtung anliegende Bildsignal mit der ersten, niedrigen Auflösung zugeführt. Weiterhin steht die Recheneinheit mit einem Speicher 5 in Verbindung.A computing unit 4 is used to generate the switch control signal S1 provided that furthermore a control signal S2 for the delay circuit 3 and provides a control signal S3 for the interpolator 2. The Input of the computing unit 4, which is preferably in the form of a microcomputer is realized, the image signal present at input 1 of the device is also used to the first, low resolution. The computing unit also stands with a memory 5 in connection.

    In der Recheneinheit 4 erfolgt eine Analyse des Bildsignals mit der ersten Auslösung. Im Rahmen dieser Analyse werden insbesondere im Bildsignal vorhandene Übergänge bzw. Flanken erkannt. Die Recheneinheit sorgt weiterhin für eine Abspeicherung von Informationen über im Bildsignal auftretende Übergänge im Speicher 5. Dabei werden insbesondere Daten abgespeichert, die die Koordinaten des Übergangs im jeweiligen Bild und auch die Richtung des Überganges (hell - dunkel oder dunkel - hell) und weiterhin den Verlauf einer Kante im Bild kennzeichnen.The image signal is analyzed in the computing unit 4 using the first one Release. As part of this analysis, in particular in the image signal existing transitions or flanks recognized. The computing unit takes care of it continue to store information about in the image signal Transitions occurring in the memory 5. In particular, data which saved the coordinates of the transition in the respective image and also the direction of the transition (light - dark or dark - light) and continues mark the course of an edge in the image.

    Die Recheneinheit 4 verwendet die aktuellen und die bereits abgespeicherten Informationen über die im Bildsignal vorhandenen Übergänge zur Ermittlung der Steuersignale S1. S2 und S3. Die bereits abgespeicherten Informationen über im Bildsignal vorhandene Übergänge können dabei Übergänge sein, die in bereits übertragenen Bildabschnitten des aktuellen Halb- oder Vollbildes liegen, oder Übergänge, die in vorherigen Halb- oder Vollbildem detektiert wurden, oder beide vorgenannten Übergangstypen.The computing unit 4 uses the current ones and those already stored Information about the transitions present in the image signal to determine the Control signals S1. S2 and S3. The information already saved about Transitions present in the image signal can be transitions that are in already transmitted image sections of the current field or full frame, or transitions that were detected in previous fields or frames, or both of the aforementioned transition types.

    Die Figur 2 zeigt ein Diagramm zur Veranschaulichung eines weichen Überganges. Der Signalverlauf E entspricht dabei dem am Eingang 1 anliegenden Bildsignal, der Signalverlauf D dem am Ausgang des Schalters 6 bereitgestellten Bildsignal, welches auf dem Display 7 dargestellt wird. Das Eingangssignal E weist dabei einen weichen Übergang auf, der durch einen niedrigen Sprung symbolisiert ist. Das daraus abgeleitete Signal D, welches auf dem Display 7 dargestellt wird, wird in diesem Falle durch den Interpolator ermittelt. Dies hat zur Folge, daß aufgrund des Interpolationsvorganges im Signal D, welches gegenüber dem Signal E eine höhere Auflösung aufweist, eine Zwischenstufe vorhanden ist, aufgrund derer das auf dem Display 7 dargestellte Signal einen weichen. natürlichen Übergang aufweist.Figure 2 shows a diagram illustrating a soft Transition. The signal curve E corresponds to that at input 1 applied image signal, the signal curve D at the output of the switch 6 provided image signal, which is shown on the display 7. The Input signal E has a smooth transition, which is characterized by a low jump is symbolized. The signal D derived therefrom, which on the display 7 is shown in this case by the interpolator determined. This has the consequence that due to the interpolation process in Signal D, which has a higher resolution than signal E, there is an intermediate stage on the basis of which this is shown on the display 7 represented signal a soft. natural transition.

    Die Figur 3 zeigt ein Diagramm zur Veranschaulichung eines harten Überganges. Der Signalverlauf E entspricht dabei dem am Eingang 1 anliegenden Bildsignal, der Signalverlauf D dem am Ausgang des Schalters 6 bereitgestellten Bildsignal, welches auf dem Display 7 dargestellt wird. Das Eingangssignal E weist dabei einen harten Übergang auf, der durch einen hohen Sprung symbolisiert ist. Das daraus abgeleitete Signal D, welches auf dem Display 7 dargestellt wird, wird in diesem Falle mittels der Verzögerungsschaltung 3 erzeugt. Dies hat zur Folge, daß der im Eingangssignal vorhandene Übergang nicht durch einen Interpolationsvorgang verschliffen wird, sondern bestehen bleibt, und als harter Sprung auch im Signal D, welches auf dem Display dargestellt wird, auftritt. Das Signal D ist lediglich gegenüber dem Signal E verzögert, wobei diese Verzögerung so gewählt ist, daß sie einerseits an die Verarbeitungszeit in der Recheneinheit 4, andererseits auch an die Verarbeitungszeit im Interpolator 2 angepaßt ist und über die Historie des Bildinhaltes die zeitlich/geometrisch richtige Position ermittelt wird.Figure 3 shows a diagram illustrating a hard Transition. The signal curve E corresponds to that at input 1 applied image signal, the signal curve D at the output of the switch 6 provided image signal, which is shown on the display 7. The Input signal E has a hard transition, which is caused by a high jump is symbolized. The signal D derived therefrom, which on the display 7 is shown, in this case by means of Delay circuit 3 generated. As a result, the im Input signal existing transition not through an interpolation process is polished, but remains, and as a hard jump also in the signal D, which is shown on the display, occurs. The signal D is only delayed compared to the signal E, this delay being chosen so that, on the one hand, the processing time in the computing unit 4, on the other hand is also adapted to the processing time in the interpolator 2 and History of the image content the correct temporally / geometrically correct position is determined.

    Die von der vorstehend beschriebenen Vorrichtung durchgeführte Signalverarbeitung und damit auch die Umschaltung des Schalters 6 arbeiten pixelgenau.The performed by the device described above Signal processing and thus the switch of the switch 6 work pixel-perfect.

    Claims (5)

    Vorrichtung zur Verbesserung der Bilddarstellung auf einem Display, mit einem Eingang (1) für ein Bildsignal einer ersten Auflösung, einem mit dem Eingang (1) verbundenen ersten Signalweg, welcher einen Interpolator (2) aufweist, der ausgangsseitig ein Bildsignal mit einer zweiten, höheren Auflösung zur Verfügung stellt, einem mit dem Eingang (1) verbundenen zweiten Signalweg, welcher Verzögerungsmittel (3) aufweist, an deren Ausgang ebenfalls ein Bildsignal mit der zweiten, höheren Auflösung abgreifbar ist, einem an die beiden Signalwege angeschlossenen Schalter (6), der in Abhängigkeit von einem Schaltersteuersignal (S1) entweder das Ausgangssignal des ersten Signalweges oder das Ausgangssignal des zweiten Signalweges an seinem Ausgang zur Verfügung stellt, einem mit dem Schalter (6) verbundenen Display (7) zur Darstellung der Bildsignale mit der zweiten, höheren Auflösung, und einer mit dem Eingang (1) verbundenen Recheneinheit (4), die zur Erzeugung des Schaltersteuersignales (S1) in Abhängigkeit vom Bildinhalt zeitlich vorhergehender Bildabschnitte des Bildsignals dient. Device for improving the image display on a display, with an input (1) for an image signal of a first resolution, a first signal path connected to the input (1), which has an interpolator (2) which provides an image signal with a second, higher resolution on the output side, a second signal path connected to the input (1), which has delay means (3), at the output of which an image signal with the second, higher resolution can also be tapped, a switch (6) connected to the two signal paths, which depending on a switch control signal (S1) provides either the output signal of the first signal path or the output signal of the second signal path at its output, a display (7) connected to the switch (6) for displaying the image signals with the second, higher resolution, and an arithmetic unit (4) connected to the input (1), which is used to generate the switch control signal (S1) as a function of the image content of temporally preceding image sections of the image signal. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    daß sie einen mit der Recheneinheit (4) verbundenen Speicher (5) zur Abspeicherung von Informationen über Signalflanken in zeitlich vorhergehenden Bildabschnitten des Bildsignals aufweist.     Device according to claim 1,
    characterized by
    that it has a memory (5) connected to the computing unit (4) for storing information about signal edges in temporally preceding image sections of the image signal.         Vorrichtung nach Anspruch 1 oder 2.
    dadurch gekennzeichnet,
    daß die zeitlich vorhergehenden Bildabschnitte des Bildsignals Bildabschnitte des aktuellen Halb- oder Vollbildes sind.    Device according to claim 1 or 2.
    characterized by
    that the temporally preceding picture sections of the picture signal are picture sections of the current field or full picture.         Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß die zeitlich vorhergehenden Bildabschnitte des Bildsignals Bildabschnitte zeitlich vorhergehender Halb- oder Vollbilder sind.    Device according to one of the preceding claims,
    characterized by
    that the temporally preceding picture sections of the picture signal are picture sections of temporally preceding fields or frames.         Vorrichtung nach einem der vorhergehenden Ansprüche.
    dadurch gekennzeichnet,
    daß das Display (7) eine LCD-Anzeige ist.    Device according to one of the preceding claims.
    characterized by
    that the display (7) is an LCD display.
    EP00123963A 1999-11-11 2000-11-03 Apparatus for improving imaging on a display device Expired - Lifetime EP1100068B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19954029 1999-11-11
    DE19954029A DE19954029C1 (en) 1999-11-11 1999-11-11 Display image enhancement device uses 2 alternate image enhancement modes selected in dependence on image content

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    EP1100068A2 true EP1100068A2 (en) 2001-05-16
    EP1100068A3 EP1100068A3 (en) 2003-01-08
    EP1100068B1 EP1100068B1 (en) 2009-01-07

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    Also Published As

    Publication number Publication date
    EP1100068B1 (en) 2009-01-07
    ATE420429T1 (en) 2009-01-15
    DE50015511D1 (en) 2009-02-26
    EP1100068A3 (en) 2003-01-08
    DE19954029C1 (en) 2001-04-05

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