EP2223184A1 - Projection avec adaptation dynamique des données d'image - Google Patents

Projection avec adaptation dynamique des données d'image

Info

Publication number
EP2223184A1
EP2223184A1 EP08857680A EP08857680A EP2223184A1 EP 2223184 A1 EP2223184 A1 EP 2223184A1 EP 08857680 A EP08857680 A EP 08857680A EP 08857680 A EP08857680 A EP 08857680A EP 2223184 A1 EP2223184 A1 EP 2223184A1
Authority
EP
European Patent Office
Prior art keywords
projector
projection surface
projection
image data
distance
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Withdrawn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
EP08857680A
Other languages
German (de)
English (en)
Inventor
Timo Lothspeich
Christian Kerstan
Thomas Hogenmueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2223184A1 publication Critical patent/EP2223184A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • 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]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • 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]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7475—Constructional details of television projection apparatus
    • H04N5/7491—Constructional details of television projection apparatus of head mounted projectors

Definitions

  • the present invention relates to a method for projecting images or image data through a projector onto a projection surface, wherein the distance between the projector and at least one point of the projection surface and / or the orientation or position of the projection center axis of the projector relative to the projection surface is determined and the information thus obtained is supplied to the removal and / or location of a control and / or regulating unit.
  • the image data is projected by light onto a suitable projection surface, such as a screen, a building wall, a screen or a display, as is known, for example, from slide projectors, overhead projectors or video beamers.
  • the invention further relates to a device corresponding to this method.
  • Methods of this type in which not only the projection of the images but also the distance and / or the relative orientation between the projector and the projection surface is determined, are used, for example, for automated equalization and / or automatic focusing of an image to be projected on the projection surface.
  • Automatic image equalization is always desirable when the projection central axis of the projector and the projection surface are not perpendicular to each other.
  • the then visible to the viewer distortions of the projected image are usually equalized by means of a keystone or keystone correction, in which the distortion occurring counteracts an artificially generated counter-distortion of the image to be projected.
  • image data is projected from a train onto a tunnel wall, with two distance meters located at vertically different points of the train measuring the respective distance to the tunnel wall. From the two distances, the angle of inclination of the tunnel wall to the projection center axis of the projector attached to the train is calculated, and on the basis of the thus calculated inclination angle, the image to be projected is automatically equalized.
  • the curvature of the tunnel in the area of the projection must be known and constant over the course of the journey, so that the equalization can lead to useful results. In all cases of image degradation, however, it is not the content of the image that is affected, but only the geometric shape of the image.
  • Focusing the image to be projected is required whenever the distance between the projector and the screen is changed.
  • Methods for automatically focusing an image to be projected are therefore used, in particular, in portable projectors, which are used regularly at different locations, that is to say at ever new distances from a projection surface.
  • the automatic focusing methods are performed in several steps. In a first step, the distance between the projector and the projection surface is measured, for example by a sensor located on the projector. Based on the measured distance, the optimal focal length of the image projected onto the projection surface is calculated in a second step and then the focal length is automatically adjusted accordingly.
  • the optics of the projector is adapted, but not the image data or the content of the image influenced.
  • the object of the present invention is to provide an improved method of the type mentioned above, which makes it possible in a simple way to optimize the projection and in particular to improve the visibility of the projected image data.
  • the idea on which the present invention is based is that at least one picture element, but preferably a plurality of picture elements of the image data to be projected onto the projection surface, is automatically transmitted from the control unit to the information for the distance between the projector and the projection surface and / or to the position information of the projector is adapted or become relative to the projection surface.
  • An essential basic idea of the invention is to not only use a measurement of the distance or a determination of the relative alignment between the projector and the projection surface in order to equalize only the projected image in its shape or by adjusting the focal length of the image but also to use the measured distance to affect the image data to be projected or individual pixels of the projected image data itself.
  • the projected image data thus depend on the measured distance between the projector and the projection surface or on the detected orientation of the projector relative to the projection surface.
  • a significant advantage of the method according to the invention is that the projected image data can be adjusted as a function of the respective distance and / or angle of the projector to the projection surface and thereby optimized with respect to various parameters.
  • Adapting in the sense of this application is above all a change or optimization of individual picture elements of an image to be projected with regard to the information content and / or readability, but in particular also an optimization of the method or of the projector with regard to the energy consumption.
  • picture element in the sense of this application R. 320920-1 4
  • the distance measurement or the determination of the relative alignment between the projector and the projection surface can either be repeated only once before the projection or during the projection at certain intervals or continuously, whereby a desired adaptation of the picture elements also changes during the projection Distances or changes of direction between the projector and the screen can be made.
  • the determination of the distance and / or the relative alignment between the projector and the projection surface can be effected in a manner known per se by means of separate distance sensors and / or angle sensors.
  • it is advantageous to use an existing sensor system for these measurements as is the case in many projectors for automatic focusing or for image processing for correcting distortions.
  • the present measured value then only needs to be further evaluated by simple algorithms in the control and / or regulating unit of the projection system.
  • the control and / or regulating unit is advantageously also arranged in the projector, so that the facilities necessary for carrying out the method are present in the projector.
  • the image data to be projected onto the projection surface to be adapted to the determined distance or to the relative orientation by means of an external system controlling the projector.
  • a distance information stored in a memory and the projection of the image data, the distance between the projector and at least one point of the projection surface and / or the position of the projection center axis of the projector relative to the projection surface by reading this information from a memory be determined.
  • the information may, for example, have been stored in the memory during a calibration process.
  • a location of the projector information about the position of the projector with respect to the projection surface is available. If an operation of the projector is detected at such a location, a corresponding distance or position information of the projector is associated with the projection area for this location from a table.
  • a measuring operation for determining the distance can be saved, if a corresponding information about the distance or the position of the projector with respect to the projection surface already exists. In this way it can also be prevented that a measurement result may possibly be falsified by objects in a radiation path during a measurement.
  • the projection method according to the invention can thereby be simplified.
  • an interface it is also advantageous to supply information about the distance between the projector and at least one point of the projection surface and / or the position of the projection center axis of the projector relative to the projection surface to the projector via an interface. If there is already information about the distance or the position of the projector to the projection surface for a particular projection position, a measurement can be saved by supplying this information to the projector via an interface.
  • Such an interface may for example be designed as a radio interface, which transmits a corresponding radio signal to the projector.
  • an easily implemented method is created in this way, which allows a targeted filtering of the displayed image information and thus ensures better clarity and improved visibility and readability.
  • the method according to the invention thus leads to a better operability of the entire projection system and thus overall to a clear increase in the user-friendliness of the projection system.
  • the at least one pixel preferably a plurality of pixels is adapted to the presentation size or will.
  • Decisive criterion of the adaptation is the representation size of the image data on the projection surface. It depends on the optical properties of the projector and its distance from the screen. Of the optical properties of the projector, especially the beam angle of importance, which determines the size of the displayed image data together with the distance between the projector and the screen. If the representation size is known therefrom, which can be calculated by means of a simple algorithm, then the image data to be projected can be correspondingly adapted to the size of the projected image. In this way, the image data can be set in relation to the overall available display size of the projected image, and thus the image content can be optimized particularly easily.
  • the pixel number of the image data projected by the projector is adapted to the determined information for the distance and / or position and / or to the determined representation size.
  • the image data is preferably projected by means of a laser projector. Conventional projectors always project the same number of pixels, no matter how large the projected image can be displayed on the screen.
  • current laser projectors are variable in their projected image point number, so that when using a laser projector, the pixel count of the image to be projected at the distance between the projector and the projection surface and / or the orientation of the projector relative to the projection surface and / or on the Display size can be adjusted.
  • the bit count of the image to be projected can be reduced, thus reducing the energy consumption of the projector without impairing the readability of the image information.
  • the at least one picture element preferably several picture elements, is adapted to the picture element number of the projector or R. 320920-1 7
  • the size and / or arrangement of the at least one picture element is adapted within the projected image data and / or that the image data to be projected is adapted in terms of its information content. This makes it possible to selectively filter the image data to be projected depending on the required application and thus to achieve better clarity and readability of the projected image. If the projection surface is, for example, an interactive projection display, then individual picture elements or the information content contained in them can also be varied in their size and projected in a desired area proportion of the overall picture for better usability of the projection display.
  • the arrangement of the image data to be projected can be changed, so that its positioning can be selected as best as possible according to the presentation size and / or the information content of the image data.
  • the image information can advantageously be changed in its information content.
  • the image data to be projected are in particular adapted such that their information content is optimally matched to the available image size.
  • the information content of the image data is thus filtered according to the available display size of the image. For example, with a small display size, a desirable but not necessarily required information content of the image to be projected may be omitted. This additionally gained space within the image to be projected can be used for a better presentation of the essential information content elsewhere.
  • the brightness and / or the contrast of the projected image on the basis of the determined representation size and / or the
  • Brightness and / or contrast settings are automatically applied. For example, this allows a reduction of the brightness and thus also of the energy consumption given a correspondingly small display size.
  • the distance from the projector to at least two points of the projection surface preferably to at least three points of the projection surface not located on a straight line, be determined. This makes it possible to additionally integrate an automatic image equalization in the projector and to use the distance measurement as supporting parameters for image processing.
  • Automatic image equalization is always desirable when the projector centerline of the projector and the projection surface are not perpendicular to each other.
  • the distortions of the projected image which then arise for the viewer can be reliably equalized by means of an automatic correction, even if the projection surface itself is not vertically aligned, in accordance with the proposed method of measuring three distances. This is not possible with traditional keystone corrections with a tilt sensor on the projector.
  • the inventive method can be carried out to determine the orientation of the projection central axis of the projector relative to the projection even without distance measurements, for example, if a pivotal or rotary movement of a pivotally or rotatably mounted projector is detected by means of an angle sensor.
  • the projected image data can be varied or optimized depending on the angle position of the projector.
  • this detection of an angular orientation of the projector can also be combined with the detection of its distance from the projection surface.
  • an initial position sensor for example for a GPS system
  • a positioning of the projector with respect to a projection surface whose position must be known.
  • the determination can be carried out either by a device of the projector itself, but can also be done via an additional device, which then transmits corresponding information about the position of the projector relative to the projection surface via an interface to the projector.
  • this information can then be stored in a memory of the projector.
  • information can also be transmitted to the projector in a proximity of the projector at a projection location via passive information transmission means such as RFID chips or barcodes or other information carriers, provided the projector is aligned with corresponding reading devices for the passive information carriers , If the projector is brought to a fixed, prescribed position relative to the projection surface, for example mounted on a support or arranged on a holder, the respective information about the position of the projector to the projection surface can be transmitted to the projector via a passive information means. If the projector is moved relative to a projection surface, then it may also be possible to store a respective position of the projection surface relative to the projector in the projector for the projection progression, or to transmit it to the projector via a suitable interface. Furthermore, it is also possible for the corresponding information about the position of the projector to be present in relation to the projection surface in the projector, but only to be transmitted via the interface at which position of a route.
  • passive information transmission means such as RFID chips or barcodes or other information carriers
  • the projector can determine by accessing the memory which position or distance the projector currently has in relation to the projection surface.
  • a quality of the projection surface can also be taken into account. If only one projection surface poorly suited for projection is available, for example a surface with a large roughness, e.g. an unpainted wall, the image impression may be disturbed by the roughness of the projection surface even at a distance sufficient for a projection of numerous information. In this case, advantageously, the information content of the image data to be displayed is also reduced in order to ensure easy readability for a user.
  • the user can specify the projection surface via a suitable operating unit, for example a screen, a rough wood wallpaper or a rough wall surface.
  • the control unit of the projection unit can then select a correct representation of the image content and in particular a suitable information content of the image, the readability on the one hand being ensured and, on the other hand, the highest possible information content.
  • the projected image it is also possible for the projected image to be observed via a camera device, and a contrast caused by the projection surface to be compared with an expected contrast in an optimal representation. In this way, disturbances due to roughness of the projection surface can be detected and, if appropriate, the image representation can be adapted to disturbing structures in the projection surface and, in particular, an excessive roughness of the projection surface can be alleviated by an image representation.
  • An adaptation can be made, except in the case of projection on solid wall surfaces, also in the case of projection onto movable surfaces, such as e.g. Water or fog banks.
  • other parameters such as, for example, the brightness of the projection light source, may also be adapted when adapting to the projection surface. In this case, the distance of a viewer to the projection surface is taken into account, for example, to avoid glare of the viewer.
  • the subject matter of the present invention is furthermore an apparatus for the projection of image data onto a projection surface, which is particularly suitable for carrying out the method.
  • Such a device comprises a projector, means for detecting the distance between the projector and at least one point of the projection surface and / or for detecting the orientation of the projection center axis of the projector relative to the projection surface, and a control and / or regulating unit, wherein on the projection surface to be projected image data by means of the control and / or regulating unit in one or more picture element (s) to the distance between the projector and the projection surface and / or to the position of the projection center axis of the projector relative to the projection surface can be adjusted.
  • the projector according to the invention can be designed in particular portable, for example as a projector, or advantageously as a display device as part of an adjustable head-up display in a motor vehicle.
  • the means for detecting the distance between the projector and at least one point of the projection surface and / or for detecting the position of the projection center axis of the projector relative to the projection surface, and preferably also the control and / or regulating unit in the projector are integrated.
  • the projector is a laser projector.
  • the laser projection system may in particular be designed on a scanner basis and for this purpose contain a deflection device with one or more movable mirrors.
  • biaxial micromechanical deflection units are known, with which a laser beam can be deflected in two axes in order to produce the desired representation on the projection surface.
  • the repetition rate of a picture thus generated can be, for example, 60 Hz.
  • the thus deflected laser beam strikes the projection surface and is scattered there or expanded into defined spatial directions, so that a real image is formed on the projection surface.
  • the laser unit may preferably be located on the same side of the projection surface as the viewer and direct the laser beam (s) onto the projection surface at least substantially from the viewing direction of the viewer.
  • the projection surface in the so-called rear projection can also be designed to be partially transparent, with the laser unit, as seen by the viewer, being arranged behind the projection surface and the laser beam R. 320920-1 12
  • a projection screen for example, a designed as a plastic part microlens grid.
  • FIG. 1 shows a schematic representation of the beam path of a projector in a device according to the invention
  • FIG. 2 shows an exemplary embodiment of projected image data on a projection surface
  • FIG. 3 shows a smaller projection area compared to FIG. 2 with correspondingly adapted image data.
  • FIG. 1 shows a laser projector 1 with a lens 2. Via the lens 2 of the laser projector 1, an image 4 is projected along a projection center axis 3 onto a projection surface 5 aligned perpendicular to the projection center axis 3.
  • the laser projector 1 is placed remotely from the projection surface 5 at a distance 6.
  • a related to the projection center axis 3 beam angle ⁇ of the projector 1 together with the distance 6 determines the representation size 7 of projected onto the screen 5 image 4. It is clear that at a constant beam angle ⁇ of the projector 1 with a variation of the distance 6, the display size 7 of the image 4 is proportionally changed in length and width.
  • FIG. 2 shows the image data 8a of an image 4a projected onto a projection surface by a laser projector.
  • the image 4a contains here usual information of a weather station.
  • the information content of the image 4a is optimized for the display size of the image data 8a.
  • the image 4a is structured in three subareas O, M and U for better clarity of the image information.
  • the inscriptions "inside” and “outside” and the associated temperature data are arranged in tabular form in the upper section as picture elements 11 and 12a, with the word “outside” of the picture element 12a being highlighted in bold in the lower, approximately equal section of the section M the temperature-related warning message is clearly highlighted in terms of size and thickness of the letters as picture element 13.
  • the lower part of the picture U shows as picture element 15 a weather forecast with a text and a symbol part.
  • the projected on the projection screen image data 8a of the image 4a are thus well structured to read the information content easy and thus to capture at a glance. Particularly important information content is clearly highlighted for the viewer.
  • FIG. 3 shows a variation of the projected image 4a from FIG. 2. Due to a smaller distance between the laser projector and the projection surface, the image 4b shown in FIG. 3 is projected on a substantially smaller image surface than the image 4a in FIG. 2.
  • the information content of the image 4b to be projected was matched to the available display area or presentation size.
  • individual picture elements of the image data 8b to be projected were adapted in their size, their arrangement and in their information content.
  • the information content of the image 4b to be projected has been adapted to the much smaller display size.
  • the information or picture elements for the date 9, the internal temperature 11 and the weather forecast 15 which are still shown in FIG. 2 in the image 4a are now no longer projected onto the projection surface in FIG.
  • the textual warning message shown in FIG. 4a of FIG. 2 was dispensed with and only the image element of the warning symbol 14b, which is much smaller than the textual warning message, is shown here.
  • Image data 8b for the image 4b thus only contain information or picture elements for the time 10b, the outside temperature 12b and the warning symbol 14b.
  • the arrangement of the picture elements 10b, 12b and 14b of the image data 8b has been changed in favor of better recognizability of the warning symbol 14b.
  • the outside temperature display 12b is located directly below the time 10b.
  • the danger of dusk warning symbol 14b is shown offset in Figure 4b with respect to the time 10b and the outside temperature display 12b to the left edge of the picture, where it stands out clearly from the time 10b and the outside temperature display 12b.
  • the font size of the picture elements 10b and 12b concerning the time indication and the outside temperature display has also been enlarged in FIG. 4b and adapted to each other in shape and size in an altered type of font, so that the projected image information 10b and 12b in FIG. 4b (FIG with the image information 10a and 12a in image 4a (FIG. 2), despite an overall reduced representation size of the image 4b, they are shown clearly larger.
  • the information content of the image 4b includes all important information contents of the image 4a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

La présente invention concerne un procédé de projection de données d'image (8a, 8b) sur une surface de projection (5) au moyen d'un projecteur (1), procédé selon lequel la distance (6) entre le projecteur (1) et au moins un point de la surface de projection (5) et/ou la position de l'axe central de projection (3) du projecteur (1) par rapport à la surface de projection (5) est (sont) déterminée(s) et les informations déterminées (distance et/ou position) sont fournies à une unité de commande. Selon l'invention, au moins un élément d'image (9-15) des données d'image (8a, 8b) à projeter sur la surface de projection (5) est adapté par l'unité de commande aux informations relatives à la distance (6) entre le projecteur (1) et la surface de projection (5) et/ou aux informations relatives à la position du projecteur (1) par rapport à la surface de projection (5). L'invention concerne également un dispositif correspondant à ce procédé et permettant la projection de données d'image (8a, 8b) sur une surface de projection (5).
EP08857680A 2007-12-03 2008-11-27 Projection avec adaptation dynamique des données d'image Withdrawn EP2223184A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007058086 2007-12-03
DE102008043189A DE102008043189A1 (de) 2007-12-03 2008-10-27 Projektion mit dynamischer Anpassung der Bilddaten
PCT/EP2008/066280 WO2009071481A1 (fr) 2007-12-03 2008-11-27 Projection avec adaptation dynamique des données d'image

Publications (1)

Publication Number Publication Date
EP2223184A1 true EP2223184A1 (fr) 2010-09-01

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EP08857680A Withdrawn EP2223184A1 (fr) 2007-12-03 2008-11-27 Projection avec adaptation dynamique des données d'image

Country Status (4)

Country Link
EP (1) EP2223184A1 (fr)
CN (1) CN101884012B (fr)
DE (1) DE102008043189A1 (fr)
WO (1) WO2009071481A1 (fr)

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DE102011088760A1 (de) 2011-12-15 2013-06-20 Robert Bosch Gmbh Anzeigevorrichtung
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Publication number Publication date
CN101884012B (zh) 2012-07-04
WO2009071481A1 (fr) 2009-06-11
CN101884012A (zh) 2010-11-10
DE102008043189A1 (de) 2009-06-04

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