WO2008148291A1 - Dispositif et procédé pour étalonner un mur à écrans multiples - Google Patents

Dispositif et procédé pour étalonner un mur à écrans multiples Download PDF

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Publication number
WO2008148291A1
WO2008148291A1 PCT/CN2008/000846 CN2008000846W WO2008148291A1 WO 2008148291 A1 WO2008148291 A1 WO 2008148291A1 CN 2008000846 W CN2008000846 W CN 2008000846W WO 2008148291 A1 WO2008148291 A1 WO 2008148291A1
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WO
WIPO (PCT)
Prior art keywords
display unit
color
screen
wall
display
Prior art date
Application number
PCT/CN2008/000846
Other languages
English (en)
Chinese (zh)
Inventor
Ruxi Lu
Xianglin Xu
Original Assignee
Vtron Technologies Ltd.
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
Application filed by Vtron Technologies Ltd. filed Critical Vtron Technologies Ltd.
Publication of WO2008148291A1 publication Critical patent/WO2008148291A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3191—Testing thereof
    • H04N9/3194—Testing thereof including sensor feedback
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection systems
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel

Definitions

  • the present invention relates to a calibration apparatus and method for a display device, and more particularly to a multi-screen wall correction apparatus and method. Background technique
  • Multi-screen digital wall-building systems can be used for various types.
  • the computer signal and video signal are displayed on the multi-screen splicing wall to form a set of functional and advanced information display management control system, providing users with an interactive human-machine interface, which can fully meet the real-time and multi-screen of the dispatching command center. Display needs.
  • the consistency of color and brightness for multi-screen wall systems has become a major problem for system integrators.
  • the CN1658651A patent document discloses a color correction method for a multi-channel projection display system, which uses each projection channel to respectively project red, green, and blue colors from 0-255 256 times, separately collects and establishes mapping data, and then The common intersection of the colors is calculated, and on this basis, the input image is modified by a single modification correction coefficient, and then input to the projector and the color data is measured until the difference between the corrected mapping data and the target color mapping data is smaller than the error range.
  • the process is complicated, and the amount of data is very large.
  • the object of the present invention is to provide a device and a method for correcting the color and brightness of a multi-screen wall with simple structure, convenient use, low cost and simple operation, and has no specific requirements on the material and display mode of the display unit, and only needs to be displayed.
  • the unit has color and brightness parameters that can be adjusted for the user.
  • a multi-screen wall correcting device comprising a camera module for extracting screen color information, an image data buffer module, a main control module for receiving and executing computer commands, and a computer.
  • the camera module includes an optical filter for collecting screen color information, a fixed focal length or an adjustable focus optical lens and a photosensitive element; the image data buffer module performs reading of the camera module, and can select compressed or uncompressed data, all images or Partial image reading;
  • the main control module completes the synchronization signal detection of the wall display unit, the transmission of the wall image data with the computer, receives the data and processes the instructions sent by the computer, controls the multi-screen wall display, specifies the screen, and adjusts the camera.
  • Display unit can use LCD (Liquid Crystal Display), DLP (Digital Light Processing), LCOS (Liquid Crystal on Silicon) or other Display technology, as long as each unit color parameter has adjustable characteristics, such as RGB or CMY, brightness, contrast, and so on.
  • LCD Liquid Crystal Display
  • DLP Digital Light Processing
  • LCOS Liquid Crystal on Silicon
  • the communication connection between the calibration device and the multi-screen wall and the computer is wired or wireless, such as RS232, USB, infrared, Bluetooth, etc., but is not limited to the above communication connection.
  • the calibration device should be placed in the range of all display units that can capture multi-screen wall; or in the large screen wall application, the method of partition correction can be adopted, and the position of the correction device can be changed as needed to take multiple correction zones. Or, each of the partitions is separately photographed by using a plurality of camera modules, and the two adjacent photographing areas should overlap at least one row of display units or one column of display units.
  • the computer completes the color analysis and correction function.
  • the processing of the image is mainly the memory requirement.
  • the memory of the main control chip in the calibration device can be expanded, and the color analysis and correction of the display unit can be completed in the calibration device.
  • build an embedded platform on the calibration device run the embedded operating system LINUX, WIN CE, etc., run color analysis and correction software under the system to enhance portability.
  • RGB primary color consistency of the display unit to ensure the color consistency of the wall
  • brightness and contrast parameters of the display unit to ensure the consistency of the brightness of the entire screen.
  • Each step adjustment may require multiple iterations.
  • the computer sends a command to the correction device to set the RGB primary color values (n, Rs, Gs, Bs) of each display unit of the wall and Set to the maximum value, the computer sends a command to control each wall of the display unit to display the specified base color or color gradation screen, such as red, green, blue, shoot the wall screen image and send it back to the computer, and analyze the color display status of each screen.
  • the specified base color or color gradation screen such as red, green, blue
  • the correcting device can make a prompt for replacement of the display unit whose color difference is large and cannot be adjusted.
  • Fixing wall basic color consistency correction method arbitrarily select a reference display unit, generally based on the central display unit, gradually adjust the consistency of the primary colors to the periphery, and the surrounding display units are based on the adjusted adjacent display units. Adjustment, each time before the adjustment will take at least one picture, separate the picture of each display unit, extract multiple sets of color data from each picture, as the color measurement value of the display unit, as the next adjustment basis.
  • the above steps may further include, before the adjustment, measuring the range of color consistency parameters that can be achieved by the entire wall.
  • the reference display unit in the above step 1 may be any display unit on the wall, but it is better to display the unit in the center of the wall.
  • Step 3 described above specifically includes the following steps:
  • a at least one picture is taken before each correction, a picture of each display unit is separated, and one or more sets of color data are extracted from each picture as a color measurement value of the display unit;
  • extracting a plurality of sets of color data from each picture is a set of color data for each of the upper end, the left end, the lower end, and the right end of each picture, and the two ends, the three ends, or the four ends each take a set of color data, and when correcting, perform Alignment of two adjacent sets of color data.
  • Color correction corrects at least three primary color channels.
  • the setting screen displays red, green, and blue solid colors or grades.
  • Levels screen independently adjust ⁇ G, B channels, achieve R, G, B primary color consistency, then set the screen to display one or more mixed colors, and then fine-tune the color parameters to achieve the mixed color of each display unit in mixed colors Consistent, and take into account the consistency of color in red, green, and blue solid colors.
  • Single channel color adjustment method for a single display unit The increment of the difference between the actual measured color value and the target value is adjusted repeatedly until the difference between the actual measured color value and the target value is less than or equal to an expected threshold value. The adjustment of the entire screen is completed by gradually adjusting the center to the periphery.
  • the RGB primary color consistency of adjacent display units does not require the RGB colors to be completely equal, but allows them to have a certain numerical difference allowed by the human eye vision, and the adjusted display unit can be adjusted at any time according to the needs of the application environment. RGB parameters.
  • RGB parameters During the extraction of the monochrome process, multiple photos can be taken as needed and then averaged at the same pixel.
  • the color selection range of a single display screen does not only take one set, but takes four sets of data at the upper, lower, left and right borders, and the comparison mode of adjacent display units is the above. The two sets of measurement data adjacent to each other in the left and right are compared.
  • the color saturation of the display unit with large viewing angle and the screen brightness are appropriately increased according to different brightness curves to obtain the best observation effect.
  • the method of partition correction is adopted, and the position of the correction device can be changed to take multiple correction zones as needed, or each of the zones can be separately photographed by using multiple camera modules, and at least two adjacent shooting areas should be at least Overlap a row of display units or a list of display units.
  • Brightness adjustment Set each display unit of the splicing wall to display the gradation grayscale with horizontal or vertical or arbitrary angle, such as 16, 16, 64 grayscale. Also in accordance with the method of correcting the color consistency of the screen, a reference display unit is selected to be adjusted to the periphery, and the adjacent display unit is referenced to the adjusted display unit. Use the horizontal grayscale picture to adjust the adjacent display units in the horizontal contrast, and adjust the adjacent display units in the vertical contrast with the vertical grayscale pictures.
  • Multi-screen wall can be used for rear projection or front projection, while front projection is limited by ambient light and size.
  • the color saturation of the display unit with a large viewing angle and the screen brightness are appropriately adjusted according to different brightness curves to obtain the best observation effect.
  • the present invention has the following beneficial effects - the multi-screen wall color correction device has a simple structure, low cost, strong anti-ambient light interference, and good correction effect. With single shot, multi-channel simultaneous correction, fast. Fully automatic adjustment to reduce manual error. There are no special requirements for the display unit, only an adjustable color parameter interface is required. There is no limit to the size of the screen that needs to be corrected. Larger wall applications can be corrected in a partitioned manner.
  • FIG. 1 is a schematic structural view of a wall correction device and a rear projection unit according to an embodiment of the present invention
  • Figure 2 is a diagram showing the internal structure of a single rear projection display unit
  • FIG. 3 is a schematic diagram of a mX n multi-screen wall according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a mX n multi-screen wall correction screen correction according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of mX n multi-screen wall partition correction according to an embodiment of the present invention.
  • FIG. 6 to FIG. 9 are the principle of partition correction correction of the real raX n multi-screen wall according to the present invention.
  • FIG. 10 is a graph showing a viewing angle error of a camera module of a wall correction device according to an embodiment of the present invention.
  • FIG. 11 is a color brightness curve diagram of a mX n multi-screen wall display unit according to an embodiment of the present invention.
  • FIG. 12 is a graph showing a final color brightness of a wall correction device according to an embodiment of the present invention.
  • FIG. 13 is a horizontal gradation grayscale picture of a display unit of a wall correction device according to an embodiment of the present invention.
  • FIG. 14 is a vertical gradation grayscale picture of a display unit of a wall correction device according to an embodiment of the present invention.
  • 15 is a horizontal and vertical gradation grayscale picture of a display unit of a wall correction device according to an embodiment of the present invention.
  • 16 is a schematic diagram of a method for adjusting brightness and contrast of a display unit of a wall correction device according to an embodiment of the present invention. detailed description
  • 101 is a display screen of a multi-screen wall; 102 is a single rear projection display unit constituting a wall, which may be a DLP projector, a CRT or an LCD, etc.; 103 is a controller corresponding to the display unit; 104 is a correction device , placed in front of the multi-screen wall can capture the range of the desired area, for example, for a small-size screen as shown in Figure 3, can be placed in the range of positions where all display areas 301 can be captured, for the large screen wall 4 should be partitioned, the calibration device is placed in a range of positions that can be photographed separately; 105 is the main control module, which can be connected to the wall and computer by wired or wireless means; 106 is the camera module; 107 is auto-focusing Optical lens and photosensitive element; 108 is a data buffer module, and 109 is a computer for running color correction software.
  • 2 is an internal structure diagram of a single rear projection display unit
  • 201 is a viewing angle direction of an observer
  • 202 is a screen of a display unit
  • 203 is a beam direction
  • 204 is a mirror
  • 205 is a light projector and a controller
  • 206 is a cabinet. .
  • the correction is mainly divided into two major steps: First, correct the consistency of the screen color, and then correct the consistency of the screen brightness.
  • Example 1 First, correct the consistency of the screen color, and then correct the consistency of the screen brightness.
  • the multi-screen wall color correction method is shown in Figure 4.
  • the calibration device is placed in front of the screen to capture the entire display area 401. Position, control the display screen to display the screen of the specified color, take a picture of the screen, and present the color information of the display unit from the picture, in the middle
  • the heart display unit 402 serves as a reference, and is adjusted in synchronization with the four directions 403, 40 405, and 406, and then adjusted in the respective small areas in a manner from the inside to the outside, such as 407, 408, 409, 410, and the like.
  • the unadjusted display unit is gradually adjusted based on the completed display unit, and the adjusted display unit can be appropriately adjusted as needed.
  • the computer sends a command to the calibration device, controls the wall to display a pure red color, takes at least one picture, and sends it back to the computer.
  • the color brightness of the camera module is adjusted appropriately. And the exposure time, so that the photos taken will not be totally dark, and there will be no color saturation in the middle of the photo, and finally the color of each display unit of the photograph taken will be uniform.
  • the captured picture is decomposed into pictures of independent display units, and the color of each display unit is analyzed, and four sets of color parameters are obtained from top to bottom, and when adjacent display units are compared, adjacent parameters are compared. Obtaining the adjustment value may require several iterations to achieve agreement. As shown in Figure 4, the direction of 403, 404, 405, 406, 407, 408, 409 is gradually adjusted to the periphery.
  • each display unit of the splicing wall is displayed with a horizontal grayscale picture and/or a vertical gradation gray level, as shown in Fig. 13 and Fig. 14 or Fig. 15.
  • Shoot the wall image analyze and compare the brightness level of the adjacent display unit.
  • 1601, 1602, 1603 are the color level graphics taken by the reference screen n
  • 1601, 1602, and 1603 are red, green, and blue brightness respectively.
  • Curves, 1604, 1605, 1606 are the red, green, and blue brightness curves of the display unit n+1 that need to be corrected. From the figure, it can be judged that the red contrast of the display unit to be corrected is low, the green brightness is high, and the blue brightness is biased. Low, as a next step to adjust the display unit n+1 screen brightness scheme. Based on the 402 display unit in the chimney 4, the display units are gradually adjusted to the periphery, and finally the brightness of the entire screen is consistent.
  • FIG. 5 Schematic diagram of the multi-screen wall color method of the partition correction mX n is as shown in FIG. 5.
  • the screen is divided into four 501, 502, 503, 504 or more correction areas, and each two adjacent correction areas overlap one row or one column of display units.
  • the four-zone correction method is as follows:
  • 601 is the first correction area
  • 602 is the reference display unit
  • the line along 602 is gradually corrected to the left
  • the column along 602 is corrected upward
  • the corrected display unit is used as the new reference.
  • gradually correct its adjacent display unit gradually correct 601 the entire display area.
  • Second area correction In Figure 7, 701 is the second correction area, and the display unit of the column 702 is 701 and 46 The overlapping area of the 601 correction area in FIG. 6 , the display unit of the column has reached the consistency in the correction of the first area, and in the second area correction, the display unit in the column of 702 should be used as the reference, and the data is gradually stepped to the right. Correcting each display unit should take into account the consistency of the upper and lower display units, and finally achieve the entire display area of the correction 701.
  • 801 is a third correction area
  • the display unit of the line of 802 is an overlapping area of 801 and the 701 correction area in FIG. 7, and the display unit of the line has been corrected in the second area.
  • the display unit of the row of 802 should be used as a reference, and the display units should be gradually corrected downward, and the consistency of the left and right display units should be taken into consideration, and finally the entire display area of the correction 801 is reached.
  • 901 is a fourth correction area
  • the display unit of the column 902 is an overlapping area of 901 and the 801 correction area in FIG. 8, and the display unit of the line has been corrected in the third area.
  • the display unit of the row 902 is the overlapping area of 901 and the 601 correction area in FIG. 6, and the display unit of the row has reached the consistency in the correction of the second area, and in the fourth area correction,
  • the display unit of the row and column of 902 is used as a reference, and each display unit is gradually corrected downward and leftward, and the consistency of each adjacent display unit should be taken into consideration, and finally the entire display area of the correction 901 is reached.
  • the screen brightness adjustment was corrected for each zone according to the method in Example 1.
  • Embodiment 1 and Embodiment 2 that, due to different shooting angles of the respective display units, the display unit of the screen edge at the same brightness is slightly darker than the brightness of the intermediate area display unit, and the variation curve is as shown in FIG. 10, and due to various displays.
  • the brightness curve of the unit and the screen material 4 are also different.
  • the color brightness of the surrounding area display unit is adjusted to be higher than the middle area according to the color saturation curve selected by the user as shown in Fig. 11, to compensate for the shooting angle error, and the final observed color consistency is obtained.
  • the final multi-screen wall display unit color saturation curve is shown in Figure 12. ⁇
  • the base color adjustment ensures the consistency of the color of the wall. Adjust the brightness and contrast of each display unit to ensure the brightness consistency of the entire multi-screen wall.
  • the computer sends a command to the calibration device, and each display unit of the splicing wall displays the hierarchical grayscale images of FIG. 13 and FIG. 14 respectively, captures and extracts the screen image, and obtains actual brightness, contrast, and color parameters of each display unit, and adjusts each display.
  • the brightness contrast of the unit makes the captured grayscale picture change evenly, and the ratio of each display unit R:G:B is 1: 1: i.
  • the method of adjustment is also a way of gradually adjusting from the center to the periphery.

Abstract

L'invention concerne un dispositif et un procédé pour étalonner un mur numérique à écrans multiples. Le dispositif comprend une caméra de prise de vues pour recueillir toutes les informations de couleur de l'écran de projection, un module de mémoire d'image, un module de commande principal pour recevoir et exécuter des instructions et un ordinateur. La caméra de prise de vues et le module de mémoire d'image communiquent respectivement avec l'écran d'affichage du mur à écrans multiples et l'ordinateur par l'intermédiaire du module de commande principal. Le procédé de l'invention consiste à sélectionner une zone d'affichage dans le mur à écrans multiples pour afficher une image spécifique, prendre des images par l'intermédiaire de la caméra de prise de vues à partir des zones d'affichage dans le mur à écrans multiples et stocker dans le module de mémoire. L'ordinateur recueille des informations de couleur de l'image dans chaque zone d'affichage, et pour chaque zone d'affichage, modifie les paramètres d'affichage non uniformes des couleurs. Le dispositif présente une structure simple bien qu'efficace, et peut mettre en oeuvre une opération de correction automatique. Le mur à écrans multiples peut être divisé sous forme de quadrillage pour mettre en oeuvre une opération de correction automatique respectivement, et aucun autre critère spécifique pour l'unité d'affichage n'est nécessaire.
PCT/CN2008/000846 2007-06-05 2008-04-25 Dispositif et procédé pour étalonner un mur à écrans multiples WO2008148291A1 (fr)

Applications Claiming Priority (2)

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CN200710028437.6 2007-06-05
CN200710028437A CN100589583C (zh) 2007-06-05 2007-06-05 一种多屏幕拼墙校正方法

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WO2008148291A1 true WO2008148291A1 (fr) 2008-12-11

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US9485499B2 (en) 2011-11-22 2016-11-01 Israel Aerospace Industries Ltd. System and method for processing multicamera array images
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