EP2057445A1 - Dispositif et procédé de simulation d'éclairage et d'ombres dans un système à réalité amplifiée - Google Patents

Dispositif et procédé de simulation d'éclairage et d'ombres dans un système à réalité amplifiée

Info

Publication number
EP2057445A1
EP2057445A1 EP05778974A EP05778974A EP2057445A1 EP 2057445 A1 EP2057445 A1 EP 2057445A1 EP 05778974 A EP05778974 A EP 05778974A EP 05778974 A EP05778974 A EP 05778974A EP 2057445 A1 EP2057445 A1 EP 2057445A1
Authority
EP
European Patent Office
Prior art keywords
sensor
illumination angle
unit
virtual
sensors
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Withdrawn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
EP05778974A
Other languages
German (de)
English (en)
Inventor
Ankit Jamwal
Alexandra Musto
Reiner Müller
Günter Schrepfer
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.)
Gigaset Communications GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP05778974A priority Critical patent/EP2057445A1/fr
Publication of EP2057445A1 publication Critical patent/EP2057445A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/00—3D [Three Dimensional] image rendering
    • G06T15/50—Lighting effects
    • G06T15/60—Shadow generation

Definitions

  • the present invention relates to a device and a method for guiding light in an augmented reality system or an "extended reality 1 " system, and in particular to a device and a method for generating virtual shadow and shadow or virtual brightening areas for inserted virtual objects corresponding to the actual lighting conditions, which can be used for mobile terminals such as mobile phones or PDAs (Personal Digital Assistant).
  • mobile terminals such as mobile phones or PDAs (Personal Digital Assistant).
  • Augmented reality or "augmented reality” represents a new field of technology in which, for example, a current visual perception of the real environment is simultaneously superimposed on additional visual information
  • a user simultaneously perceives both the real environment and the virtual image components generated by, for example, computer graphics, as combined representation (summation image).
  • This mixing of real and virtual image constituents into "augmented reality” or “augmented reality” enables the user to carry out his actions by directly including the superimposed and thus simultaneously perceptible additional information.
  • an "augmented reality” In order for an "augmented reality” to be as realistic as possible, there is a significant problem in determining the real lighting conditions in order to optimally adapt the virtual lighting conditions or a so-called light guide for the virtual object to be inserted.
  • the adaptation of the virtual lighting conditions to the actual lighting conditions is understood below to mean in particular the insertion of virtual shadow and / or brightening areas for the virtual object to be inserted.
  • the illumination direction is measured dynamically by means of image processing, a specially shaped object such as a shadow catcher being placed in the scene, and the shadows placed on this object by itself
  • a specially shaped object such as a shadow catcher being placed in the scene
  • this object or the "shadow cat” is always visible in the image when changes in the lighting take place, which is especially true for mobile "augmented reality Systems "is not practical.
  • the invention is therefore based on the object of providing a device and a method for guiding light in an augmented reality system or a system with "extended reality”. did “" create, which is simple and user-friendly and in particular for mobile applications were ⁇ can used.
  • a data processing unit can be based on previously known sensor positioning, the sensor orientation and the properties of the sensor radiation pattern and the detected sensor Aus ⁇ output signals determine an illumination angle with respect to the opti ⁇ cal axis of the recording unit.
  • the line guidance or a virtual shadow and / or a virtual fill-in area for the virtual object can subsequently be inserted into the display unit. In this way, a very realistic light guide for the virtual object is obtained with minimal effort.
  • a one-dimensional illumination angle is determined by ratio formation of two sensor output signals taking into account the sensor directional diagram and the sensor orientation.
  • GPS systems Global Positioning System
  • a spatial illumination angle may also be estimated based on only one dimensional illumination angle as well as the time of day, particularly in daylight environment, a respective time of day dependent sun altitude, i. vertical illumination angle, can be taken into account.
  • a detection unit for detecting a color temperature of the present illumination and an analysis unit for analyzing the color temperature can be used, wherein the detection unit is preferably implemented by the already existing recording unit or camera.
  • the directional diagrams of the sensors are preferably the same and the distances between the sensors to each other as large as possible.
  • the determination of the illumination angle as a function of the recording unit is carried out continuously with respect to a time axis, as a result of which a particularly realistic light guidance can be generated for the virtual objects.
  • the sensors with their sensor orientations and associated Richtdiagram ⁇ men can preferably be rotatably arranged. Furthermore, a threshold decision unit for determining a uniqueness of an illumination angle can be provided, wherein in the absence of uniqueness the virtual light guide is switched off. Accordingly, in the case of diffuse lighting conditions or lighting conditions with a large number of light sources distributed in space, no virtual shadow and / or brightening areas are generated for the virtual object.
  • a real object with a recording unit which has an optical axis
  • a virtual object to be inserted is generated with a data processing unit and likewise displayed on the display unit or superimposed on the real object.
  • a lighting is subsequently detected and output in each case as sensor output signals.
  • an illumination angle with respect to the optical axis is subsequently determined and a light guide or insertion depending on the determined illumination angle of virtual shadow and / or virtual light areas for the virtual object.
  • FIG. 1 shows a simplified representation of an application case for the method according to the invention and the associated device for carrying out a light guide in an augmented reality system;
  • FIG. 2 shows a simplified representation of the device according to FIG. 1 in order to illustrate the mode of action of the sensor directivity diagrams of the sensors when determining a lighting angle;
  • FIG. 3 shows a simplified representation to illustrate the one-dimensional illumination angle determined in an augmented reality system according to the invention.
  • FIG. 4 shows a simplified representation for illustrating a spatial illumination angle by means of two one-dimensional illumination angles.
  • FIG. 1 shows a simplified representation of an "Augmented Reality System” or “augmented reality” system, as may be implemented, for example, in a mobile terminal and in particular a mobile telecommunication terminal or mobile phone H, respectively.
  • an image of a real environment or a real object RO to be recorded is recorded by a camera or recording unit AE integrated in the mobile terminal H with an associated real shadow RS and displayed on a display unit I.
  • a so-called virtual object VO is superimposed on the recorded real object with its ZUT-associated shadow, which may be a flowerpot, for example, resulting in an augmented reality or the so-called augmented reality.
  • the real object RO with its associated real shadow RS and the virtual object VO can also represent any other objects.
  • a light source L is represented, for example, in the form of an incandescent lamp, which is primarily responsible for illuminating the real environment or the real object RO, and thus the real shadow or real shadow associated with the real object RO.
  • Shadow area RS generated. Since such a real shadow RS also changes correspondingly with a change in the illumination conditions, for example, is shortened or lengthened or rotated by a predetermined angle, such illumination conditions must also be taken into account in a so-called light guide for the virtual object VO.
  • the virtual object VO of the real environment represented on the display unit I is added, but also a corresponding virtual light guide, ie, for example, a virtual shadow VS of the virtual object VO and / or a virtual highlight area VA the virtual object VO supplemented depending on the respective lighting conditions.
  • a corresponding virtual light guide ie, for example, a virtual shadow VS of the virtual object VO and / or a virtual highlight area VA the virtual object VO supplemented depending on the respective lighting conditions.
  • the photosensitive sensors S each have a previously known sensor directional diagram with a known sensor orientation as well as a previously known sensor positioning.
  • the sensor output signals or their amplitude values output at the respective sensors can then be evaluated in such a way that an illumination angle with respect to the optical axis of the recording unit AE can be determined, which in turn a virtual light guide in the image of the display unit I for the virtual object VO or the generation of a virtual -Shat- range VS and / or a virtual Aufhell Silvers VA can be performed ,
  • This calculation is processed, for example, by a data processing unit already present in the mobile telecommunication terminal H, which is also responsible, for example, for connection establishment and termination as well as a multiplicity of further functionalities of the mobile terminal H.
  • FIG. 2 shows a simplified illustration for illustrating the basic mode of operation in the determination of a Beleu ⁇ htungswinkels, as it is required for the inventive light guide or the generation of virtual shadow and virtual Aufhell Suiteen.
  • the receiving unit AE e.g. arranged on the housing surface of the mobile terminal H, the receiving unit AE or a conventional Ka ⁇ mera and at least two photosensitive sensors Sl and S2.
  • the recording unit AE has an optical axis OA, which sets the reference axis for the illumination angle ⁇ to be determined to a light source L below.
  • the sensors S1 and S2 have a previously known sensor positioning and, according to FIG. 2, are at a previously known distance d1 and d2 from the mounting position. distance unit AE spaced. Furthermore, the sensors S1 and S2 have a previously known sensor orientation SA1 and SA2 with respect to the optical axis OA of the recording unit, which is correlated with a respective known directional pattern RD1 and RD2. According to FIG. 2, the sensor orientation SA1 and SA2 is parallel to the optical axis OA of the recording unit, resulting in a simplified calculation of the one-dimensional illumination angle ⁇ .
  • the curve of the directional diagram RD1 and RD2 is elliptical according to FIG. 2 and has an elliptical lobe shape in a spatial representation.
  • a distance from the sensor to the edge of the elliptic curve or the spatial elliptical lobe of the sensor directional diagram corresponds to an amplitude of a sensor output signal SS1 and SS2 which is output at the sensor when light from the light source L falls at a corresponding angle ⁇ 1 or ⁇ 2 to the sensor orientation SA1 or SA2 on the sensors S1 and S2.
  • an amplitude of the sensor output signal SSl and SS2 is a direct measure of the angles .beta.l and .beta.2, which is why, having knowledge of the properties of the directional diagram RD1 and RD2 or of the curve shapes and the sensor positions or the distances d1 and d2, as well as the sensor alignment SAl and SA2 with respect to the optical axis OA can uniquely determine a one-dimensional illumination angle ⁇ .
  • the corresponding virtual light guidance can now also be performed and, for example, a virtual shadow area VS and / or a virtual Aufhell Scheme VA in the image of the display unit I according to Figure 1 are realistic or winkeltreu inserted.
  • the photosensitive sensors S or S1 and S2 can be realized, for example, by a photodiode, a phototransistor or other photosensitive elements which have a previously known directional pattern. A directional pattern may also be adjusted or adjusted via a lens array located in front of the photosensitive sensor.
  • the resulting one-dimensional value can therefore be determined in a plane defined by the two sensor elements S1 and S2 by forming the ratio of the two sensor output signals SS1 and SS2 Light incident angle or illumination angle ⁇ , similar to the monopulse method in radar technology, are determined.
  • 'Since only a one-dimensional illumination angle may be ⁇ determined with two such light-sensitive sensors, however, is to determine a syndromemli ⁇ cher illumination angle for a realistic light guide, according to one embodiment of Figure 4, two such eindimensio ⁇ dimensional illumination angle for determining a spatial Be ⁇ leuchtungswinkels determined.
  • FIG. 4 two such arrangements are combined as shown in FIGS. 2 and 3, so that in each case one-dimensional illumination angles cty can be determined, for example in ay-direction and .alpha..sub.z, for example in a z-direction. This makes it possible to determine a resulting spatial illumination angle for a light source L in the room.
  • a third photosensitive sensor is preferably arranged, for example, on the housing surface of the mobile terminal H such that it is located in a further plane.
  • it is arranged, for example, perpendicular to the xy plane of the first two sensors in an xz or yz plane, as a result of which Angled coordinate system results.
  • one of the three sensors is used twice to determine the two one-dimensional illumination angles ⁇ y and ⁇ z .
  • other sensor arrangements and in particular a larger number of sensors are also possible, as a result of which an accuracy or a detection range of the lighting conditions can be further improved.
  • the respective sensor orientations, sensor positioning and sensor directional diagrams are taken into account accordingly in the evaluation of the output sensor output signals.
  • a common method for determining the spatial illumination angle from two one-dimensional illumination angles is, for example, the triangulation method known from GPS systems (Global Positioning System).
  • GPS systems Global Positioning System
  • any other methods for determining a spatial illumination angle are also possible.
  • such a spatial illumination angle can also be determined or estimated only on the basis of a one-dimensional illumination angle, provided that the plane of the two light-sensitive sensors necessary for this one-dimensional illumination angle is parallel to a horizon or an earth surface and Main illumination source is realized by the sun or sunlight, as spielmik in daylight environment is usually the case.
  • a time of day at a specific location is taken into consideration, from which a position of the sun or a second illumination angle can be estimated vertically or vertically to the earth's surface.
  • illumination changes taking place only in the horizontal direction are detected by the two sensors S1 and S2 or by the one-dimensional illumination angle .alpha.
  • the lighting changes taking place in the vertical direction are derived from an instantaneous time of day.
  • a timer unit which is usually present in mobile terminals H, for example in the form of a clock with time zone indication and summertime consideration, is used.
  • a detection unit for detecting a color temperature of the present illumination can be provided for determining a daylight or artificial light environment, wherein an analysis unit analyzes or evaluates the detected color temperature. Since the conventional recording units or cameras used in mobile terminals H generally provide such information with regard to a color temperature in any case, the recording unit AE and the data processing unit of the mobile terminal H are used as detection unit for the color temperature det. Due to the use of existing Zeitge ⁇ units and recording units, results for this second embodiment, a particularly simple and kos ⁇ tenberichte implementation.
  • the properties or curves according to FIG. 2 of the sensor directional diagrams of the sensors S used are preferably the same or identical and the distances between the sensors are as large as possible.
  • the illumination angle is continuously carried out with respect to a time as a function of the recording unit AE. More precisely, for each acquisition of a sequence of images, associated calculations and a corresponding light guidance are carried out. In principle, in order to save resources such as computing capacity, however, such calculations can also be limited to predetermined intervals which are independent of the functionality of the recording unit.
  • the sensors with their previously known sensor orientations and associated sensor directional diagrams can also be rotatable, e.g.
  • the changing angle values for the sensor orientations must also be recorded and transmitted to the data processing unit for compensation or consideration.
  • a threshold decision unit for determining a uniqueness of a lighting angle and thus the lighting conditions, wherein the virtual light guide for the virtual objects is switched off or no virtual shadow and / or virtual Aufhellberei ⁇ che are generated in the image of the display unit.
  • faulty virtual light guidance can thereby be prevented, which in turn permits a very realistic depiction of virtual objects.
  • the present invention has been described with reference to a mobile telecommunication terminal, such as a mobile H for example. However, it is not limited to and includes in the same way, other mobile devices such as PDAs (Personal Digital Aassistant). It can also be applied to stationary augmented reality systems. Furthermore, the present invention has been described with reference to a single light source such as a light bulb or a sun ei ⁇ ner. However, the invention is not limited thereto, but in the same way also includes other main light sources, which can be composed of a multiplicity of light sources or other types of light sources. Furthermore, the invention has been described with reference to two or three light-sensitive sensors for determining ariesswin ⁇ cle. However, it is not limited thereto, but equally includes systems with a plurality of photosensitive sensors that can be arbitrarily positioned and aligned to the receiving unit AE and the optical axis OA.

Abstract

L'invention concerne un dispositif et un procédé de guidage de la lumière dans un système de réalité augmentée. Une unité de prise de vue (AE) présentant un axe optique photographie un objet réel (RO, RS) et l'affiche sur une unité d'affichage (I). Une unité de traitement de données génère un objet virtuel (VO) et affiche également cet objet virtuel (VO) sur l'unité d'affichage (I). A partir de données relatives à au moins deux capteurs (S) photosensibles, notamment un positionnement connu, une orientation, un diagramme directionnel et un signal de sortie émis, un angle d'éclairage est déterminé et le guidage de la lumière pour l'objet virtuel (VO) dans l'unité d'affichage (I) est réalisé en fonction de cet angle d'éclairage.
EP05778974A 2004-10-13 2005-07-05 Dispositif et procédé de simulation d'éclairage et d'ombres dans un système à réalité amplifiée Withdrawn EP2057445A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05778974A EP2057445A1 (fr) 2004-10-13 2005-07-05 Dispositif et procédé de simulation d'éclairage et d'ombres dans un système à réalité amplifiée

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04024431 2004-10-13
PCT/EP2005/053194 WO2006040200A1 (fr) 2004-10-13 2005-07-05 Dispositif et procede de simulation d'eclairage et d'ombre dans un systeme de realite augmentee
EP05778974A EP2057445A1 (fr) 2004-10-13 2005-07-05 Dispositif et procédé de simulation d'éclairage et d'ombres dans un système à réalité amplifiée

Publications (1)

Publication Number Publication Date
EP2057445A1 true EP2057445A1 (fr) 2009-05-13

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Country Link
US (1) US20080211813A1 (fr)
EP (1) EP2057445A1 (fr)
JP (1) JP2008516352A (fr)
TW (1) TW200614097A (fr)
WO (1) WO2006040200A1 (fr)

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CN108320320B (zh) * 2018-01-25 2021-04-20 重庆爱奇艺智能科技有限公司 一种信息显示方法、装置及设备

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