WO2012134236A2 - Procédé et système destinés à générer un modèle de surface numérique basé sur un traitement parallèle - Google Patents

Procédé et système destinés à générer un modèle de surface numérique basé sur un traitement parallèle Download PDF

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Publication number
WO2012134236A2
WO2012134236A2 PCT/KR2012/002414 KR2012002414W WO2012134236A2 WO 2012134236 A2 WO2012134236 A2 WO 2012134236A2 KR 2012002414 W KR2012002414 W KR 2012002414W WO 2012134236 A2 WO2012134236 A2 WO 2012134236A2
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unit
dsm
generating
target
area
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English (en)
Korean (ko)
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WO2012134236A3 (fr
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김기태
표세영
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SK C&C Co Ltd
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SK C&C Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three-dimensional [3D] modelling for computer graphics
    • G06T17/05—Geographic models
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2210/00—Indexing scheme for image generation or computer graphics
    • G06T2210/52—Parallel processing

Definitions

  • the present invention relates to digital surface model (DSM) generation, and more particularly, parallel to generate a DSM of a region of interest (ROI) by distributing load based on parallel processing.
  • DSM digital surface model
  • ROI region of interest
  • the present invention relates to a process-based digital surface model generation method and system.
  • High-resolution three-dimensional spatial information or digital surface model of the target area such as flight simulators, military missions, cellular antenna installation, urban planning, etc.
  • DSM digital surface model
  • a method of generating a DSM using aerial photographs stores all image data included in a region of interest (ROI) where a DSM is to be generated, and disparity spatial image (DSI) using all stored image data.
  • ROI region of interest
  • DSI disparity spatial image
  • the present invention is derived to solve the problems of the prior art, it is possible to generate the DSM of the target area by dividing the target area to generate the DSM into predetermined unit areas and parallel processing of the divided unit areas.
  • An object of the present invention is to provide a method and system for generating a digital surface model based on parallel processing.
  • an object of the present invention is to provide a method and system for generating a parallel surface-based digital surface model that can update only the DSM of the unit area that needs to be updated when the DSM of the target area needs to be updated.
  • the method for generating a digital surface model comprises the steps of: dividing a target area for generating a digital surface model (DSM) into a plurality of unit areas; Searching for reference images including at least a portion of each of the plurality of unit regions among a plurality of image data including at least a portion of the target region; Extracting a height value corresponding to the two-dimensional coordinates of each of the plurality of unit regions by using the searched reference images, and using the extracted height value unit DSM for each of the plurality of unit regions Generating; And generating a DSM of the target area by using the generated unit DSM.
  • DSM digital surface model
  • the generating of the unit DSM may generate the unit DSM by processing each of the unit regions corresponding to the reference images in parallel.
  • the dividing may include dividing the target area into the plurality of unit areas by using a grid method.
  • the DSM of the target region may be updated only by the unit DSM of the unit region to be updated among the unit regions, so that the DSM of the target region may be updated, and selecting an update unit region to be updated among the plurality of unit regions. ; Generating an update unit DSM of the update unit region by using update reference images for the selected update unit region; And updating the unit DSM corresponding to the update unit region among the DSMs of the target region to the update unit DSM.
  • a digital surface model generation system comprising: a divider for dividing a target area for generating a DSM into a plurality of unit areas; A search unit searching for reference images including at least a portion of each of the plurality of unit regions among a plurality of image data including at least a portion of the target region; Extracting a height value corresponding to the two-dimensional coordinates of each of the plurality of unit regions by using the searched reference images, and using the extracted height value unit DSM for each of the plurality of unit regions A plurality of unit DSM generators to generate; And a region DSM generator configured to generate a DSM of the target region by using the generated unit DSM, wherein the plurality of unit DSM generators may process the respective unit regions in parallel to generate the unit DSM.
  • An apparatus for generating a digital surface model may receive information about a target unit area among unit areas of a target area divided to allow parallel processing and reference images including at least a part of the target unit area.
  • Receiving unit Extracting a height value corresponding to two-dimensional coordinates of the target unit area by using the received information about the target unit area and the reference images, and using the extracted height value, the unit of the target unit area
  • a DSM generator for generating a DSM
  • a provision unit configured to provide the generated unit DSM of the target unit region so that the entire DSM of the target region may be generated using the unit DSMs of the unit regions.
  • the present invention by generating a DSM of the target area by dividing the target area to be generated DSM into predetermined unit areas, and processing the divided unit areas in parallel, it can be generated as the amount of related data such as image data increases. This reduces the amount of memory, computation, and processing time that is incurred, and reduces the creation time of the DSM.
  • the unit DSM generating apparatus calculates the image area to be projected on each unit area in advance, and generates the DSM only for the corresponding area, thereby reducing the amount of related data to generate the DSM for each unit area. This has the advantage of reducing the amount of computation, memory and generation time required.
  • the present invention checks for an update unit area requiring updating to generate only an update unit DSM for the update unit area, and generates an update unit DSM for the previous unit DSM of the update unit area. By replacing with, the error existing in the DSM of the target area can be corrected or the DSM can be easily updated due to the change of the feature.
  • FIG. 1 illustrates a configuration of a DSM generation system according to an embodiment of the present invention.
  • FIG. 2 illustrates a configuration of an embodiment of the apparatus for generating a local DSM shown in FIG. 1.
  • FIG. 3 illustrates a configuration of an embodiment of the apparatus for generating a unit DSM shown in FIG. 1.
  • Figure 4 shows an example of the divided form of the virtual ground of the target area in the present invention.
  • FIG. 5 shows another example of the divided form of the virtual ground of the target area in the present invention.
  • FIG. 6 is a flowchart illustrating an operation of a method for generating a DSM according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating an embodiment of an update process of updating a DSM of a target area in the method of generating a DSM according to the present invention.
  • FIG. 8 illustrates a configuration of another embodiment of the apparatus for generating a local DSM shown in FIG. 1.
  • FIG. 1 illustrates a configuration of a digital surface model generation system according to an embodiment of the present invention.
  • the DSM generating system includes a local DSM generating device 110 and a plurality of unit DSM generating devices 120.
  • the regional DSM generating device 110 is a device for generating a DSM of a region of interest (ROI).
  • the regional DSM generating apparatus 110 receives the unit DSM of the divided unit region of the target region from the plurality of unit DSM generating apparatuses 120 capable of parallel processing, and merges the received plurality of unit DSMs to form the DSM of the target region. Create
  • the local DSM generating apparatus 110 processes the joint portions between the plurality of unit DSMs using various methods, and generates the DSM of the target region through the joint portion processing process.
  • the regional DSM generating apparatus 110 divides a target region into a plurality of unit regions so that the plurality of unit DSM generating apparatuses 120 can process the target region, and then the plurality of unit DSM generating apparatuses 120 Provide information (including information about at least geographic coordinates of the unit area). Accordingly, each of the plurality of unit DSM generating apparatuses 120 may search for reference images including at least a portion of the corresponding unit region, and generate the unit DSM of the corresponding unit region using the found reference images.
  • the unit DSM generated by the unit DSM generating apparatus 120 means a DSM for a corresponding unit area.
  • the regional DSM generating apparatus 110 may divide the virtual ground (virtual earth or virtual terrain) of the target region into a plurality of unit regions in order to divide the target region.
  • the information about each of the divided unit areas may include at least information about geographic coordinates.
  • the virtual ground may be generated using a Shuttle Radar Topographic Mission (SRTM) or a Digital Elevation Model (DEM) or information about a target area (including at least geographic coordinate information).
  • SRTM Shuttle Radar Topographic Mission
  • DEM Digital Elevation Model
  • the regional DSM generating apparatus 110 may divide the target area into a plurality of unit areas based on the information of the target area (including at least geographic coordinate information).
  • the local DSM generating apparatus 110 searches for reference images corresponding to each of the plurality of unit regions directly in the local DSM generating apparatus 110 according to a situation, and provides information about the found reference images and the corresponding unit region.
  • each of the plurality of unit DSM generating apparatuses 120 may generate a unit DSM for a corresponding unit area.
  • the image data includes an image or a photograph taken for the purpose of generating a terrain DSM, a photograph taken by a general optical camera, a multi-spectral image, an aerial photograph, a satellite photograph, a LiDAR. Photographing data and the like.
  • the local DSM generating apparatus 110 may provide only unit region information corresponding to each of the plurality of unit DSM generating apparatuses 120.
  • the local DSM generating apparatus 110 may provide reference units corresponding to unit region information corresponding to each of the plurality of unit DSM generating apparatuses 120.
  • the local DSM generating apparatus 110 may include both cases 1) and 2), and it is preferable to select the local DSM generating apparatus in consideration of the load in the local DSM generating apparatus 110.
  • the load in the local DSM generating apparatus 110 may be increased by searching for reference images of the unit regions in the local DSM generating apparatus 110, the corresponding loads are distributed in the plurality of unit DSM generating apparatuses 120. It may be more preferable for the case of 1), which can reduce the memory, the calculation amount, and the processing time. Therefore, in the detailed description of the present invention, the case 1) will be described as an example.
  • the regional DSM generating apparatus 110 may update the DSM of the target region.
  • the update can be performed by the following process.
  • the region DSM generating apparatus 110 is updated with the unit DSM generating apparatus 120 corresponding to the selected (or confirmed) unit region.
  • the update unit DSM may be received from the unit DSM generating apparatus 120 of the update unit region, and the DSM of the target region may be updated by replacing the previous unit DSM of the update unit region with the update unit DSM.
  • the selection of the unit area that needs to be updated means a process in which a unit area that needs to be updated is selected by a user or an external input. This means that the unit area requiring updating is automatically identified (identified) by comparing the previously obtained image data with the newly obtained image data.
  • An embodiment of the present invention may include a case in which the update unit area is directly selected by the user, or may include a case in which the update unit area is automatically confirmed by the device.
  • the unit DSM generating apparatus 120 receives information on a unit region or a unit region corresponding to the corresponding unit DSM generating apparatus 120 among the divided unit regions of the target region from the local DSM generating apparatus 110, and receives the received information. Reference images including at least a part of the corresponding unit area are searched based on the information on the unit area. The unit DSM generating apparatus 120 extracts height values corresponding to two-dimensional coordinates of the corresponding unit region by using the found reference images, and generates unit DSM by using the extracted height values.
  • the plurality of unit DSM generating apparatuses 120 may generate the unit DSMs for the corresponding unit areas through parallel processing, the plurality of unit DSM generating apparatuses 120 may generate the plurality of unit DSMs generated by the respective unit DSM generating apparatuses 120.
  • Unit DSMs can be used to quickly create a DSM for a target area.
  • the unit DSM generating apparatus 120 selects an appropriate master image and a slave image by using information such as the position and angle at the time of image acquisition among the reference images, and then the master image and the slave image. DSM can be generated through stereo matching between the two.
  • the system according to the present invention generates unit DSMs for the unit areas of the target area by processing them in parallel in each of a process unit for each unit area, that is, the unit DSM generating device 120, and generates a plurality of unit DSMs. Since the generating device 120 generates the DSM of the target region by merging a plurality of unit DSMs generated on the basis of parallel processing, the image data of the target region may be dispersed to reduce the amount of calculation, memory, and processing time, and thereby Quickly create local DSMs.
  • each of the plurality of unit DSM generating apparatuses 120 processed in parallel in FIG. 1 is divided and displayed as a separate device such as a computer or a server, the present invention is not limited thereto, and each of the plurality of unit DSM generating apparatuses 120 is not limited thereto.
  • the device may correspond to each of a plurality of processors provided in the server. That is, a plurality of unit DSMs may be generated by processing in parallel in a plurality of devices divided into separate devices, and a plurality of unit DSMs may be generated by processing in parallel in a plurality of processors included in one device. It may be.
  • FIG. 2 illustrates a configuration of an embodiment of the apparatus for generating a local DSM shown in FIG. 1.
  • the local DSM generating apparatus 110 includes a virtual ground determiner 210, a storage 220, a divider 230, and a local DSM generator 240.
  • the virtual floor determination unit 210 determines the virtual ground of the target area from one or more preset virtual grounds.
  • the virtual ground determined by the virtual ground determination unit 210 may be SRTM, may be a pre-stored DEM for the target region, or may be a specific ground generated based on information on the target region.
  • the previously stored DEM may be a rough DEM for a target region.
  • the storage unit 220 is configured to store a plurality of image data including at least a portion of a target area, and may store not only a plurality of image data but also data on a virtual ground and various data for performing the present invention.
  • the storage unit 220 may include image data of all regions capable of generating DSM as well as image data corresponding to a target region.
  • the storage unit 220 may separately configure a plurality of image data for a region, for example, a database (not shown) for storing aerial photographs and storage means for storing other kinds of data.
  • the database that stores the video data may be configured as a separate server or a separate DB instead of a local DSM generating device.
  • the dividing unit 230 is configured to divide the virtual ground of the target area among the virtual grounds determined by the virtual ground determining unit 210 into a plurality of unit regions, and the manner of dividing the virtual ground may vary.
  • the dividing unit 230 may divide the virtual ground of the target area into 16 unit areas ROI-1 to ROI-16 using a grid method.
  • the division unit 230 may divide the virtual ground of the target area into 16 unit regions ROI-1 to ROI-16 having a triangular shape, as shown in the example illustrated in FIG. 5. .
  • the number of unit areas divided by the divider 230 is not limited to 16, and may be set in consideration of the amount of data to be calculated and the number of unit DSM generating devices 120, and the like.
  • the shape of these is also not limited to these two examples.
  • the dividing unit 230 may determine and divide the shape of the unit areas based on information about the target area, for example, area information.
  • the local DSM generating apparatus When the plurality of unit regions are divided by the divider 230, the local DSM generating apparatus provides information about each of the divided unit regions to the unit DSM generating apparatus 120 corresponding to the corresponding unit region, and the plurality of unit DSMs. Receive a unit DSM for each of the unit regions from the generating device.
  • the regional DSM generating unit 240 is configured to generate the DSM of the target region by using the unit DSMs corresponding to the plurality of unit regions received from the plurality of unit DSM generating apparatuses. Create a DSM.
  • the local DSM generator 240 naturally or smoothly processes the joint between the unit DSMs.
  • the regional DSM generating apparatus may add a configuration function for the update if necessary to update the terrain model.
  • the configuration of an updater that performs an update function is added to the configuration of FIG. 2.
  • the update unit 250 selects an update unit area to be updated among the unit areas of the target area when an update to the DSM of the target area is requested, and updates the update unit DSM to the corresponding unit DSM generating device corresponding to the selected update unit area. Request and receive.
  • the updater 250 For example, assuming that at least a part of the unit DSM of the ROI-11 410 of the unit areas illustrated in FIG. 4 is to be updated, the updater 250 generates the unit DSM of the ROI-11 410. A request is made to generate the update unit DSM of the ROI-11 to the unit DSM generating unit, and when the update unit DSM of the ROI-11 generated from the unit DSM generating unit is received, the unit DSM is provided to the local DSM generating unit 240.
  • the regional DSM generation unit 240 updates the DSM of the target region by using the update unit DSM requested and received by the updater 250. By replacing the previous unit DSM corresponding to the update unit area with the update unit DSM, You can update the DSM of the target area.
  • FIG. 3 illustrates a configuration of an embodiment of the apparatus for generating a unit DSM shown in FIG. 1.
  • the unit DSM generating apparatus 120 includes a receiving unit 310, a DSM generating unit 320, and a providing unit 330.
  • the receiver 310 receives information on the corresponding unit area from among the plurality of unit areas divided by the local DSM generating device from the local DSM generating device so that parallel processing is possible.
  • the receiver 310 may include a searcher 311.
  • the searcher 311 searches for reference images corresponding to information on a corresponding unit area received by the receiver 310, and searches for a reference image. To the receiving unit 310.
  • the receiver 310 receives information about the corresponding unit area and reference images including at least a part of the corresponding unit area.
  • the information on the unit area received by the receiver 310 may be information on the virtual ground of the corresponding unit area divided from the virtual ground of the target area, or may be area information on the unit area.
  • the receiver 310 may receive a request message for requesting the update of the unit DSM.
  • the DSM generator 320 extracts a height value corresponding to the two-dimensional coordinates of the unit region by using the information on the unit region received by the receiver 310 and the reference images searched by the search unit 311. Using the extracted height value, unit DSM is created for the unit area.
  • the providing unit 330 may provide the unit DSM generated by the DSM generating unit 320 to the local DSM generating apparatus so that the local DSM generating apparatus may generate the DSM of the target region using the plurality of unit DSMs.
  • FIG. 6 is a flowchart illustrating an operation of a method for generating a DSM according to an embodiment of the present invention.
  • the method for generating a DSM selects a target region where a DSM is to be generated and determines a virtual ground of the selected target region (S610).
  • the target area is Yeongdeungpo and wants to generate the DSM of Yeongdeungpo
  • one of at least one virtual ground is determined, and only the virtual ground corresponding to the Yeongdeungpo region is selected from the determined virtual ground.
  • the virtual ground may be a ground generated based on SRTM, DEM, and region information on a target region.
  • the virtual ground of the determined target region is divided into a plurality of N unit regions, and parallel processing is performed on each of the divided unit regions.
  • Information is provided (S620 and S630).
  • the present invention is not limited thereto.
  • the virtual ground is generated based on region information on the target region, and the generated virtual ground is generated. It may be determined by the virtual land of the target area.
  • step S620 the virtual ground of the target region is described as being divided into a plurality of unit regions. However, in this case, since the virtual ground of the target region may not be provided, only the region information of the target region may be provided.
  • S610 may be replaced with a configuration for receiving area information of the target area. In this case, step S620 may be replaced by dividing the target region into a plurality of unit regions based on the received region information of the target region.
  • the present invention can be applied to receiving a virtual ground of a target area and dividing it into a plurality of unit areas. Furthermore, only the area information of the target area is provided and the area information is divided into a plurality of unit areas. This can also be applied.
  • the reference images including at least a portion of each of the unit regions are searched based on the information about each of the unit regions, and the reference images searched for each of the unit regions are used.
  • a height value corresponding to the two-dimensional coordinates of each of the unit areas is extracted, and a unit DSM for each of the unit areas is generated using the extracted height value (S640).
  • the reference images including at least a portion of the first unit region are searched among the plurality of image data including at least a portion of the target region by using the information about the first unit region, and the first images are searched by using the found reference images.
  • a height value corresponding to the two-dimensional coordinates of the unit area is extracted and a unit DSM of the first unit area is generated using the extracted height value.
  • a height value corresponding to the two-dimensional coordinates of the two unit region is extracted and a unit DSM of the second unit region is generated using the extracted height value. This process is performed in parallel from the first unit region to the Nth unit region, thereby generating unit DSMs for the first unit region to unit DSM for the Nth unit region in parallel.
  • reference images for each of the unit regions may also be searched in parallel for each of the unit regions.
  • the method for generating a DSM divides a target region into a plurality of predetermined regions, and generates unit DSMs for the plurality of divided predetermined regions in parallel, thereby generating a plurality of data required for generating the DSM of the target region. It can be distributed to the process units of. This load distribution reduces the amount of computation that must be processed in each process unit and the amount of associated data that needs to be stored (for example, reference images), which reduces the time for generating DSMs in the target area. Can be.
  • each process unit that is, unit DSM generating apparatus of FIG. 1 is described as parallel processing for each of the plurality of unit regions in step S640 shown in FIG. 6, parallel processing in the present invention is one in one process unit. It is not limited to processing only the unit area of. For example, a process unit may sequentially process two unit regions, and a plurality of process units may perform parallel processing, and two process units may process three unit regions in parallel.
  • parallel processing is not limited to only mean that it is done at the same time, but includes all the processing that can be performed using a separate or distributed data path.
  • parallel processing may be performed independently in each processing unit, but at least some data may be performed dependently.
  • two process units may each process two separate data in parallel, two process units may process two independent data of three independent data independently and one independent data together.
  • FIG. 7 is a flowchart illustrating an embodiment of an update process of updating a DSM of a target area in the method of generating a DSM according to the present invention.
  • the updated reference images including at least a portion of the update unit region, that is, the update reference images are searched for, and the height values corresponding to the two-dimensional coordinates are searched using the searched update reference images.
  • the update unit DSM of the update unit area is generated (S730 to S750).
  • the DSM of the target area is updated by replacing the previous unit DSM of the update unit area with the update unit DSM (S760).
  • the update unit areas for the plurality of update unit areas are generated by processing the plurality of update unit areas in parallel.
  • the method for generating a digital surface model may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Magneto-optical media and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
  • program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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Abstract

Cette invention se rapporte à un procédé et à un système destinés à générer un modèle de surface numérique basé sur un traitement parallèle. Le procédé destiné à générer un modèle de surface numérique selon un mode de réalisation de la présente invention comprend les étapes consistant à : scinder la région cible en une pluralité de surfaces unitaires afin de générer un modèle de surface numérique (DSM) ; rechercher des images de référence qui comprennent au moins une partie de chacune de la pluralité de surfaces unitaires, parmi la pluralité de données d'images qui comprennent une partie au moins de la région cible ; extraire une valeur de hauteur qui correspond à une coordonnée bidimensionnelle de chacune de la pluralité de surfaces unitaires en utilisant les images de référence recherchées et générer un DSM unitaire de chacune de la pluralité de surfaces unitaires en utilisant la valeur de hauteur extraite ; et générer un DSM de la région cible en utilisant le DSM unitaire généré, l'étape consistant à générer le DSM unitaire générant le DSM unitaire à l'aide d'un traitement parallèle de chacune des surfaces unitaires qui correspondent aux images de référence, en réduisant de ce fait la quantité de calcul, la mémoire et le temps de traitement nécessaires pour générer le DSM de la région cible, en améliorant la vitesse de génération d'un DSM et étant donné que le DSM d'une surface spécifique qui doit être mise à jour de la région cible peut être généré de manière spécifique, le DSM de la région cible est facilement mis à jour.
PCT/KR2012/002414 2011-04-01 2012-03-30 Procédé et système destinés à générer un modèle de surface numérique basé sur un traitement parallèle Ceased WO2012134236A2 (fr)

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