EP3867796A1 - Procédé et dispositif de détermination d'une carte des alentours - Google Patents

Procédé et dispositif de détermination d'une carte des alentours

Info

Publication number
EP3867796A1
EP3867796A1 EP19772993.2A EP19772993A EP3867796A1 EP 3867796 A1 EP3867796 A1 EP 3867796A1 EP 19772993 A EP19772993 A EP 19772993A EP 3867796 A1 EP3867796 A1 EP 3867796A1
Authority
EP
European Patent Office
Prior art keywords
server
point cloud
points
mobile station
mobile device
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.)
Pending
Application number
EP19772993.2A
Other languages
German (de)
English (en)
Inventor
Darius Vahdat-Pajouh
Michael Bucko
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.)
DESIGN REACTOR Inc
Original Assignee
Visualix 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 Visualix GmbH filed Critical Visualix GmbH
Publication of EP3867796A1 publication Critical patent/EP3867796A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/20—Scenes; Scene-specific elements in augmented reality scenes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/05—Geographic models
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/40—Extraction of image or video features

Definitions

  • the subject relates to a method and a server for determining an environment map.
  • the measurement and evaluation of an environment of a mobile device is possible due to the good quality of camera images from mobile devices as well as good sensor values. It is possible for features in the image to be detected on the basis of orientation data (pose) from a camera of a mobile device and a respective image (frame) from a camera of the mobile device and points of a point cloud to be assigned to these features.
  • orientation data pose
  • frame respective image
  • Transform can be a position of the feature in a global
  • Coordinate system can be determined.
  • Point coordinates of the points of the point cloud can be determined.
  • Point clouds from this are well known and are used, for example, in so-called augmented reality (AR) applications.
  • AR augmented reality
  • Well-known examples of such augmented reality applications are the ARKit from Apple ® and ARCore from Google®. Both are application-specific programming interfaces that make it possible to use the mobile device to create and use point clouds on the mobile station for augmented reality applications.
  • a disadvantage of determining the point cloud in the mobile device is that on the one hand the computing power is limited and on the other hand due to faulty ones
  • a drift in the point coordinates can occur in the global coordinate system. It is known, for example, that the drift is 1% to 10%, which can be due in particular to an insufficient evaluation of the available sensor data.
  • the object is therefore based on the task, one on points and
  • a mobile device can in particular be a cell phone, a tablet computer, smart glasses, wearables or the like.
  • Movement data can be, in particular, inclination and acceleration information that is stored in the mobile device by means of suitable sensors, for example
  • Inclination sensors and / or acceleration sensors can be detected. With the help of the movement data, a movement of the mobile device is in the room
  • the mobile device can be positioned relative to a reference point.
  • Motion data are evaluated in particular between two images in order to determine the change in the position of the device relative to the real object which was recorded in the image.
  • orientation data of a camera of the mobile device be received on the server side.
  • Orientation data (pose) of a camera can be expressed by a direction of a vector in a coordinate system, the vector lying in particular in the optical axis of the camera.
  • the coordinate system is in particular a global one
  • a sequence of images, in particular in a video, is recorded by the camera of the mobile device. If an image of the camera has been captured, the orientation information in the sense of orientation data can be captured in the mobile device and which can be captured
  • Motion information between one of the previous images and the current image was recorded based on the motion data.
  • This information that is to say the movement data and orientation data, together with the assigned image of the camera, can be received on the server side.
  • An image of the camera can be a so-called "frame" of a moving image.
  • the server-side point cloud is created in particular in the server by means of a SLAM (simultaneous localization and mapping) algorithm.
  • SLAM simultaneous localization and mapping
  • the creation of a point cloud on the basis of images is known per se, but not that the movement data and the orientation data of the mobile device are used for this. Due to the fact that on the server side there is greater computing power available and on the other hand latency is permitted to create the point cloud, the point cloud created on the server side will generally map the environment better than a mobile station side created point cloud. With the help of the server-side point cloud, a map of the surroundings is at least partially created.
  • Computational accuracy as well as the fact that server-side data from a large number of images from very different times, which are also hours, days or weeks apart, can be used to continuously add and / or adapt the point cloud.
  • the greater accuracy is due to the fact that features in images can be detected using a wide variety of algorithms on the server side, in order to be able to describe a three-dimensional structure within the space using a sequence of images using point coordinates.
  • point coordinates represent a point cloud, points of the point cloud each being one of the
  • point coordinates are represented by vectors.
  • the origin of the vector can, on the one hand, be a globally valid origin and, on the other hand, it is possible for vectors to be determined in each case as point coordinates depending on recognized points or defined anchors. It is possible that, for example, GPS coordinates are used to the
  • the point coordinates represent points that represent real objects.
  • a surface of a real object can be described with a plurality of points in three-dimensional space.
  • Motion data along with the images from the camera can determine the points with greater accuracy and greater density than this
  • the points on the server side point cloud are at least partially supplemented by the points on the mobile station side points. It is possible to weight the points of the point cloud on the server side and only points with one Add weighting above a threshold of server-side points. A density of the points in an area can be relevant for the weighting of the individual
  • Point cloud can be at least partially converted using the point coordinates of the points of the point cloud on the mobile station side and / or vice versa.
  • a feature in an image is represented on the server side by a point with point coordinates, that on the mobile station side it was referenced by a point with point coordinates that differ only marginally from the point coordinates of the server-side point.
  • a new point can be calculated from two points, for example by interpolation, averaging or other calculation methods, and its point coordinates can be used for the new server-side point cloud.
  • the point coordinates of the points of the point cloud on the mobile station side be used with the help of the server side
  • the evaluated movement data can be corrected.
  • the movement data can be evaluated on the server side with greater accuracy than this
  • the movement data can be corrected on the server side by comparing the data of the movement sensors with image data.
  • the movement data optimized in this way can be used to correct the point coordinates of the points of the point cloud on the mobile station side.
  • the point coordinates of the point of the point cloud on the mobile station side were recorded on the mobile station side using the and
  • orientation data which are received on the server side and evaluated on the server side. Based on this evaluated on the server side
  • Orientation data can also be used to correct the point coordinates recorded on the mobile station side.
  • the orientation data received on the server side be used on the server side with the aid of the received
  • Movement data are corrected.
  • the movement data make it possible to compensate for errors in the orientation data and vice versa.
  • feature recognition and / or feature description be carried out in the received image.
  • feature detection and “feature description” are known per se. In particular, MOPS or SIFT processes are used for this.
  • descriptors "descriptors” can be optimized by learning algorithms. To describe the features, it is possible to evaluate the point coordinates on the server side and to find optimal descriptors on the basis of the evaluation, in particular by means of deep-learning algorithms.
  • Feature descriptions are in particular those features that are invariant are, in particular with respect to rotation, translation, panning, zooming, light change and / or the like.
  • a bundle adjustment is carried out on the server side in the received image.
  • the point cloud is stored on the server side and is particularly persistent, it can be compared with point clouds of other mobile devices. It is also possible to carry out extensive analyzes of the point cloud, in order to possibly find a point cloud in the received mobile station-side point cloud
  • the point cloud on the mobile station side is created by means of visual motion-bound odometry (visual-inertia odometry).
  • a loop closure can be determined.
  • Point coordinates and points of the point cloud determined on the mobile station side are corrected. It is possible to determine the total drift of a closed ring (loop closure) and to use this to retroactively shift individual point coordinates of the points of the point cloud by the drift or a fraction of the drift.
  • the shift can be dependent on a shift vector which is determined by the drift. The amount of the displacement vector can increase with increasing
  • the image is evaluated on the server side.
  • contrast, brightness, sharpness, depth of field and the like can be evaluated on the server side and setting data depending on this for the be determined on the mobile station side camera.
  • setting data can then be transmitted to the mobile device in order to set the camera there, so that the image information is optimized for calculating the point cloud.
  • server-side point cloud in particular the new server-side point cloud, be transmitted to the mobile device. This makes it possible to replace or optimize the point cloud present in the mobile device. It is also possible for such a point cloud to be transmitted to devices in which no point cloud can be calculated at all on the mobile station side. Only based on the image information as well as the movement and
  • a mobile device can contribute to the determination of point clouds and receive point clouds.
  • the mobile device can then be located in space by comparing the current points in an image with points in the point cloud. If there is a match, the position of the device can be determined therefrom without the device itself having to record position information.
  • Anchors can be placed relative to points in the point cloud.
  • Point cloud is received by a mobile device and that an augmented reality application is initialized with the received point cloud in the mobile device.
  • an AR application At the beginning of an AR application, information about the environment is already available in the form of a point cloud.
  • server-side point clouds can be received by a plurality of mobile devices on the server side and for the point-point clouds received on the mobile station side to be used for the server side Adjust point cloud. This takes advantage of a variety of devices
  • Point clouds can be determined from a specific environment. This large number of point clouds can be integrated on the server side into the server-side point cloud in order to make them more robust and precise.
  • Detect application It is thus possible to determine at least two instances of the point clouds on the server side and to learn at least one feature in each instance by means of feature recognition and / or feature description. A respective instance together with the learned features can be transmitted to a mobile device.
  • the point cloud determined on the server side makes it possible to determine the position of a mobile device.
  • a point cloud of a mobile device can be compared with the server-side point cloud.
  • the points recorded in a current image can be compared with points of the point cloud, and if there is a match, the mobile device can be positioned in the virtual environment determined by the point cloud.
  • 1 shows a system for determining an area map
  • FIG. 3 shows an arrangement for recording movement data, orientation data and / or point clouds of a mobile device
  • Flg. 4 shows a process for determining a server-side point cloud
  • 5 shows a sequence of a loop closure
  • FIG. 8 shows a method for transmitting a point cloud to a mobile device
  • FIG. 9 shows a method for determining the position of a mobile device.
  • Point clouds limited, in particular due to a limited memory and also due to limited computing power. Therefore, the object of the idea is to prepare the information acquired on the mobile station side on the server side in such a way that an environment map and a positioning therein, even in large environments, over a large number of
  • mobile stations 2 are connected to a central server 6 via a wide area network 4, as shown in FIG. 1. Bi-directional communication is possible.
  • Subject are from the mobile stations 2 to the server 6 via the
  • Wide area network 4 transmits at least movement data and orientation data.
  • a transmission of the point cloud in particular the so-called “raw feature points”, can also be transmitted.
  • the movement data are also described as IMU (inertial measurement stater) and the orientation data are also described as pose transform data.
  • a server-side point cloud is calculated on the server side with the received data in a SLAM system (Simultaneous Localization and Mapping). To create the point cloud, it is necessary to assign point coordinates to points via vectors
  • FIG. 2 shows a scene in which three striking points 8 can be detected.
  • Such striking points 8 can be described by features that can be detected via a suitable description of the features (descriptors).
  • the features of points 8 are, in particular, invariant to changes such as movement, light change, panning, zoom or the like. It is also possible to define those feature descriptors that have a higher-ranking invariance.
  • a first image 10 the points 8 are shown in a specific arrangement to one another. On the basis of the orientation data 12, it is possible not only to score the points
  • a Cartesian coordinate system 18 is used in particular, the y axis being parallel to gravity, the x axis being parallel to the horizontal and the z axis being perpendicular to the plane spanned by the x and y axes.
  • the vectors 14 are in particular three-dimensional vectors.
  • Orientation information 12 and the movement information 16 can be one
  • a mobile station 2 first transmits an image 10, the associated orientation data 12 and the movement data 16 captured between two images 10, as shown in FIG. 3, to the server 6.
  • the image data stream thus obtained is evaluated in the server 6 and a server-side point cloud is calculated using a SLAM system.
  • the number of points in a point cloud can also be almost unlimited. This enables a point cloud for a large environment based on information from one or more to determine mobile devices 2. It is proposed, for example, that orientation data 12, movement data 16 and images 10 are received in at least one mobile device 2 in step 20. After receiving, for example, feature recognition is carried out and points are detected on the basis of feature descriptions. The points thus detected are extracted 22.
  • a point cloud 30 is determined in step 26 from the extracted points.
  • This point cloud 30 is stored on the server side in a memory.
  • the point cloud 30 is formed from a plurality of points which have a unique identifier and at least point coordinates.
  • the point cloud 30 calculated on the server side is based in particular on a plurality of information from, for example, a plurality of different mobile devices. For position detection, it is now possible to compare points detected on the mobile station side with the points of the point cloud. If there is a match, the position of the mobile device can then be determined by again using the orientation data 12, based on the recognized points, to determine the position of the mobile device 2 in the point cloud and thus the real environment.
  • server-side point cloud 30 Since the server-side point cloud 30 is more robust and precise, it is
  • Step 20 can be followed by step 32 during the evaluation, as shown in FIG. 5a.
  • images 10 and points 8 recorded so far are compared with those of the server-side point cloud, for example in order to carry out a loop closure.
  • this loop closures it is possible to determine whether a mobile device 2 is in a same position after a certain time and / or the same features can be recognized in an image. This is of particular interest to a drift that occurs after a Set a while to correct.
  • the points recorded after the detection of the loop closure (32) are added to the point cloud 30 in step 34.
  • a step 36 first determines the amount by which the position of the mobile device 2 calculated on the mobile station side, which is based on the movement data 16 and
  • Orientation data 12 was determined, deviates from the actual position of the mobile device 2. Since it was recognized on the server side that the mobile device 2 has returned to its original position, the position relative to the start of an AR session is clearly defined. If the position calculated on the mobile station side deviates from this, there is a drift, the amount of which can be determined (36). With the help of this amount of drift determined on the server side, it is possible to determine the points of the
  • the point coordinates or vectors 14 of individual points 8 are corrected. It is also possible to supplement a point cloud calculated on the mobile station side with points of a point cloud calculated on the server side. For this purpose, the point cloud 30 created between steps 20 and 26 is recorded. In addition, a point cloud on the mobile station side is received in a step 40. The points of the point cloud received on the mobile station side can be supplemented, corrected or changed in some other way by the point cloud 30 determined on the server side. The point cloud 30 thus optimized can then be transmitted from the server 6 to the mobile device 2 in a step 42.
  • a feature recognition is carried out in step 24 after the image 10 (20) has been received.
  • the invariance of the features is checked and, in particular, features can be defined using deep learning strategies. It can then be checked whether the feature recognition in an image 10 was good or bad (44) and from this it can be derived whether the quality of the captured image 10 was sufficiently good for the feature recognition.
  • at least one setting parameter for the camera exposure, contrast, color and the like
  • the orientation data 12 is calculated in a step 48 on the server side.
  • the calculation of the orientation data 12 can, on the one hand, use the movement data 16 and orientation data 12 received from the mobile device 2, and, on the other hand, a comparison can be made between the points detected on the mobile station side and the points of the point cloud 30 on the server side. For example, it is possible that the
  • a device-independent position determination is also possible.
  • points detected on the mobile station side can be transmitted to the server 6 in a step 56 become.
  • these points are compared with the points of the point cloud 30 on the mobile station
  • the server-side point cloud is continuously checked and supplemented. Since information is continuously received from one or more mobile devices on the server side, the point cloud is continuously supplemented with points and / or points are corrected. This increases the server-side point cloud
  • the quality of the individual points of the point cloud can be optimized through bundle adjustment, feature matching and outlier removal.
  • descriptors can be used to evaluate the image information in an optimized way and to convert it into points of the point cloud.
  • the method in question thus creates a point cloud on the server side, which has an essentially global validity and can be acquired via a plurality of devices and made available to a plurality of devices.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Geometry (AREA)
  • Software Systems (AREA)
  • Remote Sensing (AREA)
  • Computer Graphics (AREA)
  • Processing Or Creating Images (AREA)
  • Image Analysis (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention concerne un procédé pour déterminer une carte des alentours. Ledit procédé comprend : la réception, côté serveur, de données de mouvement d'un appareil mobile ; la réception, côté serveur, de données d'orientation d'une caméra de l'appareil mobile et la réception, côté serveur, de l'image de la caméra associée respectivement aux données de mouvement reçues et aux données d'orientation reçues ; et l'évaluation, côté serveur, de l'image reçue conjointement avec les données de mouvement et les données d'orientation pour générer, côté serveur, un nuage de points, le nuage de points, côté serveur, formant au moins en partie la carte des alentours.
EP19772993.2A 2018-10-15 2019-09-05 Procédé et dispositif de détermination d'une carte des alentours Pending EP3867796A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018125397.4A DE102018125397A1 (de) 2018-10-15 2018-10-15 Verfahren und Vorrichtung zur Bestimmung einer Umgebungskarte
PCT/EP2019/073630 WO2020078615A1 (fr) 2018-10-15 2019-09-05 Procédé et dispositif de détermination d'une carte des alentours

Publications (1)

Publication Number Publication Date
EP3867796A1 true EP3867796A1 (fr) 2021-08-25

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ID=67999604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19772993.2A Pending EP3867796A1 (fr) 2018-10-15 2019-09-05 Procédé et dispositif de détermination d'une carte des alentours

Country Status (5)

Country Link
US (2) US11568598B2 (fr)
EP (1) EP3867796A1 (fr)
CN (1) CN113039554A (fr)
DE (1) DE102018125397A1 (fr)
WO (1) WO2020078615A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018125397A1 (de) * 2018-10-15 2020-04-16 Visualix GmbH Verfahren und Vorrichtung zur Bestimmung einer Umgebungskarte
DE102020213111A1 (de) 2020-10-16 2022-04-21 FoP Consult GmbH Verfahren und System zur Bestimmung einer Pose oder Position eines mobilen Endgeräts
US20230194301A1 (en) * 2021-12-16 2023-06-22 Univrses Ab High fidelity anchor points for real-time mapping with mobile devices

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WO2014130854A1 (fr) * 2013-02-21 2014-08-28 Regents Of The Univesity Of Minnesota Étalonnage de paramètre intrinsèque d'un système de navigation inertielle à vision assistée
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Also Published As

Publication number Publication date
CN113039554A (zh) 2021-06-25
WO2020078615A1 (fr) 2020-04-23
DE102018125397A1 (de) 2020-04-16
US20210327130A1 (en) 2021-10-21
US20230298344A1 (en) 2023-09-21
US11568598B2 (en) 2023-01-31

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