EP1288899A1 - Procédé et appareil pour le traitement d'images vidéo - Google Patents

Procédé et appareil pour le traitement d'images vidéo Download PDF

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Publication number
EP1288899A1
EP1288899A1 EP02292021A EP02292021A EP1288899A1 EP 1288899 A1 EP1288899 A1 EP 1288899A1 EP 02292021 A EP02292021 A EP 02292021A EP 02292021 A EP02292021 A EP 02292021A EP 1288899 A1 EP1288899 A1 EP 1288899A1
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EP
European Patent Office
Prior art keywords
sub
fields
field
luminous elements
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02292021A
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German (de)
English (en)
Inventor
Sébastien Weitbruch
Cedric Thebault
Axel Goetzke
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP01250304A external-priority patent/EP1291835A1/fr
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP02292021A priority Critical patent/EP1288899A1/fr
Publication of EP1288899A1 publication Critical patent/EP1288899A1/fr
Withdrawn legal-status Critical Current

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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
    • G09G3/2037—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with specific control of sub-frames corresponding to the least significant bits
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • 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
    • G09G3/2003—Display of colours
    • 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
    • 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 and a device for processing video pictures for display on a display device having at least two kinds of luminous elements with different time responses, a first kind of luminous elements having a first time response and a second kind of luminous elements having a second time response, wherein the first time response is slower than the second time response.
  • the present invention is related to the reduction of the phosphor lag artefacts caused by the different time responses of the luminous phosphor elements.
  • the new Plasma technology has to provide a picture quality as good or better than the old standard TV technology.
  • the Plasma technology gives the possibility of "unlimited" screen size, of attractive thickness, but on the other hand, it generates new kinds of artefacts, which could damage the picture quality. Most of these artefacts are different to those of known TV pictures and so more visible since people are used to seeing old TV artefacts unconsciously.
  • One of these artefacts is called the "phosphor lag" and is due to the different time responses of the luminous materials making the different colour components used in the panel. This difference generates a kind of yellowish trail behind and a blue area in front of the bright objects moving on a dark background mainly (or the opposite).
  • Fig. 1 shows the simulation of such a phosphor lag effect on a natural scene with a movement basically in the vertical direction, where the moving white trouser-leg in front of the black background generates such trail.
  • the red, green and blue luminous elements do not have the same properties because of the chemical properties of each phosphor.
  • life duration and the brightness are privileged at the expense of behaviour homogeneity.
  • Measurements show that the green phosphor is the slowest, the blue one is the fastest and the red one is mostly in-between.
  • the red (R), green (G) and blue (B) cells have different response times, at the front and rear of a moving object like a white block, the concerning pixels are discolored.
  • the object of the present invention is to disclose a solution that compensates for the differences between the time responses of the three phosphors without the need of a motion estimator.
  • the frame period is divided in lighting periods called sub-fields.
  • the whole frame period is divided into sub-fields and the three colour components RGB use the same sub-field organisation (for a same video value, they are switched on and off at the same time), and so as the red and the green phosphors are slower than the blue one, the phosphor lag artefact occurs.
  • This invention proposes a new sub-field organization which reduces the phosphor lag artefact, and which may be characterized by an increased number of sub-fields. It is the general idea of the invention to build two or more sub-field groups in a frame period. In a specific embodiment three sub-field groups may be created in a frame period, and the idea is to translate (particularly for the blue component) some sub-fields from the first sub-field group into the two other groups as if the phosphors were switched on and off later in order to simulate the phosphor lag. Thus, the first sub-field group is used to fully code the red and the green components, and partially the blue one. The second and the third sub-field groups are used to simulate the phosphor lag.
  • the extra sub-field group/s can also be used for generating light in the cells having the mid range time response, i.e. red luminance material plasma cells to make an optimised compensation.
  • red luminance material plasma cells i.e. red luminance material plasma cells to make an optimised compensation.
  • the differences in time responses between red and green plasma cells is inferior in comparison to the differences between blue and red or between blue and green cells, it is sufficient to use the extra group/s of sub-fields for the blue plasma cells only.
  • the solution according to the invention has the great advantage that the implementation of the compensation method performs good and is very simple to implement. There is no need to implement a motion estimator.
  • a drawback of the solution is that the extra sub-field groups occupy a part of the frame period and cannot be used to generate more light pulses in order to enhance the contrast. This problem can be avoided if the compensation method is simply switched off in video scenes where the contrast is regarded most important.
  • the compensation method can be used for different types of sub-field coding schemes. It can be used in connection with the conventional ADS (Address, Display, Separated) driving scheme, where each sub-field consists of the three periods addressing, sustaining and erasing. It can likewise be used in connection with the incremental driving scheme where no sub-field code words are used in which there is a sub-field inactivated beween two activated sub-fields or vice versa.
  • ADS Address, Display, Separated
  • the sub-fields are arranged in decreasing order to let the biggest sub-fields lag on their own group.
  • the phosphor lag problem is a result of the difference in the time responses of the phosphors.
  • the green and the red phosphors the slowest
  • at least the blue one has to be made slower as illustated in Fig. 3.
  • the real time responses for the red, green and blue phospors is shown.
  • the time response of the blue phosphor is adapted to the time responses of the red and green phosphors. This compensation is done by signal processing means as described hereinafter.
  • the frame period is divided in three periods for three sub-field groups in order to make the blue component simulate the phosphor lag.
  • the code that is used for sub-field coding in the three sub-field groups is based on a standard decreasing 10 sub-fields code in the first disclosed embodiment. This code will be used for the first sub-field group for driving the red and the green phosphor elements.
  • the video values for the blue component are split in three parts (one for each sub-field group).
  • the value for the first part is smaller than normally (i.e. when the blue component is only coded with the basic 10 sub-fields code), so less sub-fields will be activated in the first group, that has the effect that the blue component is switched on later in comparison to the red and green signal component and that means that the "impulse response" is made similar to that of the red and green phosphors.
  • the two other parts are used to simulate the lag when the green phosphor is switched off.
  • the picture quality corresponds to a 10 sub-fields code
  • the cost almost corresponds to a 20 (10+6+4) sub-fields code
  • the luminance corresponds to half of the one obtained with a basic 20 sub-fields code.
  • FIG. 4 An example of a basic 10 sub-fields code is shown in Fig. 4.
  • the numbers given in each sub-field correspond to the relative sub-field weight.
  • the sum of the sub-field weights correspond to 255 which is the highest possible video value in 8-bit representation.
  • FIG. 5 An example of a possible sub-field organization for phosphor lag reduction, according to this invention is shown in Fig. 5.
  • the 1 st sub-field group is identical to the standard 10 sub-fields organization of Fig.4.
  • the second sub-field group has the the similar structure as the 4 th to 9 th sub-field of the first group and the third group has the same structure as the 6 th to 9 th sub-field of the first group.
  • the values for the red and green colour components are coded solely with the basic 10 sub-fields code of the first group whereas the blue values are coded with the sub-fields of all three groups.
  • Some examples of encoding video levels according to both possibilities are shown in Fig. 6.
  • an entry "1" in the code words corresponds to a sub-field activation (means light generation on), and "0" to a sub-field inactivation (means light generation off).
  • the code words for the other video values in the range of 0 to 255 can be derived by distributing the video values among the three parts accordingly, e.g. with a function calculating the corresponding percentages.
  • some rounding needs to be done and for an optimisation some experiments to make a fine tuning should also be done for the corresponding panel technology.
  • the first code (on the left) is the code used for the red and the green components, the second one (on the right) is the equivalent code used for the blue component.
  • the three parts are coded as depicted in Fig. 7 and one obtains the final code 0010101110 011011 0110.
  • Fig. 9 illustrates the simulation of the compensation method according to the principle of Fig. 7 for the case of the white square moving on a black background as presented in Fig. 2.
  • each box (each representing one phosphor element of one pixel), the time response is represented in respect to the new sub-field reorganization and to phosphor lag of the red and green elements.
  • the green and the red elements are only on at the beginning of the frame period, but because of the phosphor lag, they also seem to be on later, whereas the blue element is really switched on and off later.
  • the invention can be be used in connection with the incremental driving/coding scheme where no sub-field code words are used in which there is a sub-field inactivated beween two activated sub-fields or vice versa.
  • the second embodiment is dedicated to this incremental driving/coding scheme.
  • Fig. 10 shows a possible 10 sub-field organisation similar to Fig. 4 but with different sub-field weights.
  • three sub-field groups are created for phosphor lag reduction.
  • Each of the groups will be coded with the incremental driving/coding scheme.
  • a speciality of this coding scheme is that not every sub-field has an erasing period. The erasing operation will be performed for all previous sub-fields at the end of each sub-field group.
  • the incremental driving/coding scheme has the great advantage that it totally suppresses the dynamic false contour effect. It has on the other hand the disadvantage of a poor grey scale portrayal because the sub-fields code words for the full video level range 0 - 255 is greatly decimated.
  • Fig. 11 shows the sub-field organisation including the extra two sub-field groups. It is mentioned that the decreasing order of sub-field weights is kept solely in the 1 st group only. Experiments have shown that some better results could be achieved in this embodiment if the rule is not kept in the second and third sub-field group.
  • Fig. 12 presents the admissble code words according to incremental coding on the left side and its transformation to corresponding phosphor lag simulation code words on the right. In this case the table is complete.
  • the code words on the left side are used for driving the red and the green plasma cells.
  • On the right side the equivalent code words for the blue palsma cells are given.
  • FIG. 14 a circuit implementation of the invention is illustrated.
  • Input R,G,B video data of a first frame F n is forwarded to a frame memory 10 and an optional picture analysis block 11.
  • Picture analysis block 11 analyses the picture in the frame memory 10. If the block 11 outputs the analysis result that the picture has a number of critical transitions, the picture analysis block 11 switches over the sub-field coding process from standard coding to phosphor lag compensated coding. Different coding tables are recorded in the sub-field coding block 13 for this purpose.
  • the picture analysis block 11 includes a unit for edge detection.
  • Algorithms for edge detection are known from the prior art. For example in EP-A-0 913 994 an algorithm is described with which it can be reliably detected whether a pixel lies on a horizontal transition. This algorithm is used for letterbox detection in this patent application but it could also be used for edge detection in modified form.
  • the picture analysis takes some processing time and this could cause that another frame memory 12 is necessary with which the sub-field coding process can take place while the picture analysis block 11 analyses the frame in frame memory 10.
  • the R, G and B components from frame memory 12 are forwarded to sub-field coding unit 13 that performs sub-field coding under control of control unit 16.
  • the sub-field code words are stored in memory unit 14.
  • the external control unit 16 also controls reading and writing from and to this memory unit.
  • the external control unit 16 also generates timing signals for the control of the units 10 to 12 (not shown).
  • the sub-field code words are read out of the memory device and all the code words for one line are collected in order to create a single very long code word which can be used for the line wise PDP addressing. This is carried out in the serial to parallel conversion unit 15.
  • the control unit 16 generates all scan and sustain pulses for PDP control. It receives horizontal and vertical synchronising signals for reference timing.
  • the plasma display panel has the reference number 17.
  • the general idea of this invention (dividing the frame period in sub-periods in order to reduce the differences of time responses between the different colors) is applicable to all displays presenting different time responses for the three colors and using sub-fields to make light (pulse width modulation).

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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)
EP02292021A 2001-08-23 2002-08-12 Procédé et appareil pour le traitement d'images vidéo Withdrawn EP1288899A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02292021A EP1288899A1 (fr) 2001-08-23 2002-08-12 Procédé et appareil pour le traitement d'images vidéo

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01250304A EP1291835A1 (fr) 2001-08-23 2001-08-23 Procédé et appareil pour le traitement d'images vidéo
EP01250304 2001-08-23
EP02292021A EP1288899A1 (fr) 2001-08-23 2002-08-12 Procédé et appareil pour le traitement d'images vidéo

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EP1288899A1 true EP1288899A1 (fr) 2003-03-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005036513A1 (fr) 2003-10-14 2005-04-21 Matsushita Electric Industrial Co., Ltd. Procede et appareil de traitement de signal d'image
EP1684258A1 (fr) * 2005-01-25 2006-07-26 Thomson Licensing Procédé et appareil pour afficher des images video sur un un panneau d'affichage à plasma

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896317A2 (fr) * 1997-08-07 1999-02-10 Hitachi, Ltd. Méthode et appareil d'affichage d'image en couleur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0896317A2 (fr) * 1997-08-07 1999-02-10 Hitachi, Ltd. Méthode et appareil d'affichage d'image en couleur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005036513A1 (fr) 2003-10-14 2005-04-21 Matsushita Electric Industrial Co., Ltd. Procede et appareil de traitement de signal d'image
EP1675089A1 (fr) * 2003-10-14 2006-06-28 Matsushita Electric Industrial Co., Ltd. Procede et appareil de traitement de signal d'image
EP1675089A4 (fr) * 2003-10-14 2009-07-15 Panasonic Corp Procede et appareil de traitement de signal d'image
EP1684258A1 (fr) * 2005-01-25 2006-07-26 Thomson Licensing Procédé et appareil pour afficher des images video sur un un panneau d'affichage à plasma

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