• Title/Summary/Keyword: Image-based modeling

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City-Scale Modeling for Street Navigation

  • Huang, Fay;Klette, Reinhard
    • Journal of information and communication convergence engineering
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    • v.10 no.4
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    • pp.411-419
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    • 2012
  • This paper proposes a semi-automatic image-based approach for 3-dimensional (3D) modeling of buildings along streets. Image-based urban 3D modeling techniques are typically based on the use of aerial and ground-level images. The aerial image of the relevant area is extracted from publically available sources in Google Maps by stitching together different patches of the map. Panoramic images are common for ground-level recording because they have advantages for 3D modeling. A panoramic video recorder is used in the proposed approach for recording sequences of ground-level spherical panoramic images. The proposed approach has two advantages. First, detected camera trajectories are more accurate and stable (compared to methods using multi-view planar images only) due to the use of spherical panoramic images. Second, we extract the texture of a facade of a building from a single panoramic image. Thus, there is no need to deal with color blending problems that typically occur when using overlapping textures.

Enhanced Extraction of Traversable Region by Combining Scene Clustering with 3D World Modeling based on CCD/IR Image (CCD/IR 영상 기반의 3D 월드모델링과 클러스터링의 통합을 통한 주행영역 추출 성능 개선)

  • Kim, Jun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.11 no.4
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    • pp.107-115
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    • 2008
  • Accurate extraction of traversable region is a critical issue for autonomous navigation of unmanned ground vehicle(UGV). This paper introduces enhanced extraction of traversable region by combining scene clustering with 3D world modeling using CCD(Charge-Coupled Device)/IR(Infra Red) image. Scene clustering is developed with K-means algorithm based on CCD and IR image. 3D world modeling is developed by fusing CCD and IR stereo image. Enhanced extraction of traversable regions is obtained by combining feature of extraction with a clustering method and a geometric characteristic of terrain derived by 3D world modeling.

Sketch-based 3D modeling by aligning outlines of an image

  • Li, Chunxiao;Lee, Hyowon;Zhang, Dongliang;Jiang, Hao
    • Journal of Computational Design and Engineering
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    • v.3 no.3
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    • pp.286-294
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    • 2016
  • In this paper we present an efficient technique for sketch-based 3D modeling using automatically extracted image features. Creating a 3D model often requires a drawing of irregular shapes composed of curved lines as a starting point but it is difficult to hand-draw such lines without introducing awkward bumps and edges along the lines. We propose an automatic alignment of a user's hand-drawn sketch lines to the contour lines of an image, facilitating a considerable level of ease with which the user can carelessly continue sketching while the system intelligently snaps the sketch lines to a background image contour, no longer requiring the strenuous effort and stress of trying to make a perfect line during the modeling task. This interactive technique seamlessly combines the efficiency and perception of the human user with the accuracy of computational power, applied to the domain of 3D modeling where the utmost precision of on-screen drawing has been one of the hurdles of the task hitherto considered a job requiring a highly skilled and careful manipulation by the user. We provide several examples to demonstrate the accuracy and efficiency of the method with which complex shapes were achieved easily and quickly in the interactive outline drawing task.

Interactive 3D Stereoscopic Image Editing System using Image-based modeling (영상 기반 모델링 기법을 이용한 대화식 3차원 입체 영상 저작 시스템)

  • Yun, Chang-Ok;Yun, Tae-Soo;Lee, Dong-Hoon
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.10 no.2
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    • pp.53-66
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    • 2006
  • Recent technique has shown high interest in 3D stereoscopic image, one out of high immersion appearance techniques. Unlike general 2D image, 3D stereoscopic image is generated by 3D geometric information. Therefore, the lack of 3D geometric information sometimes imposes restrictions or makes editing more tedious. We propose a new unsupervised technique aimed to generate stereoscopic image which is estimated by depth-map information using image-based modeling from a single input image. The proposed system is implemented as the Adobe Photoshop(R) plug-in for considering generality and expandability, and also supports a preview function of interactive 3D stereoscopic image to determine stereoscopic view of high quality.

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Image-Based Modeling of Urban Buildings Using Aerial Photographs and Digital Maps (항공사진과 수치지도를 이용한 도시 건물의 이미지 기반 모델링)

  • Yoo, Byounghyun;Han, Soonhung
    • Journal of the Korean Association of Geographic Information Studies
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    • v.8 no.1
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    • pp.49-62
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    • 2005
  • The VR (virtual reality) simulator such as helicopter simulation needs virtual environment of existing urban area. But the real urban environment keeps changing. We need a modeling method to make use of the GIS data that are updated periodically. The flight simulation needs to visualize not only buildings in near distance but also a large number of buildings in the far distance. We propose a method for modeling urban environment from aerial image and digital map with a comparatively small manual work. Image based modeling is applied to urban model which considers the characteristic of Korean cities. Buildings in the distance can be presented without creating a lot of polygons. Proposed method consists of the pre-processing stage which prepares the model from the GIS data and the modeling stage which makes the virtual urban environment. The virtual urban environment can be modeled with the simple process which utilizes the height map of buildings.

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Development of Image-Based Modeller Using Primitive Constraints

  • Seo, Sang-Hyun;Kim, Dong-Hwan;Yoon, Kyung-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.164.3-164
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    • 2001
  • In this paper, we present a method for obtaining the actual modeling data through reconstructing a 3D data from an image and a method of estimating the geometrical information and the camera location of architectural objects from a photograph containing a virtual environment are introduced. Our approach combines both geometry-based and image-based modeling techniques. The modeling system is effective and robust because it exploits constrains that are characteristic of architectural scenes. Our approach can recover models for use in either geometry-based rendering systems. We present results that demonstrate out approach´s ability to create realistic renderings of architectural scenes from viewpoints far from the original photographs.

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Pre-construction Simulation of Precast Bridge Piers and Quality Management using Augmented Reality (증강현실 기반의 프리캐스트 교각의 사전시공 시뮬레이션 및 시공성 정밀도 관리방안)

  • Park, Seong-Jun;Dang, Ngoc-Son;Yoon, Do-Sun;Lon, Sokanya;Shim, Chang-Su
    • Journal of KIBIM
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    • v.8 no.1
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    • pp.15-23
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    • 2018
  • Geometry control of precast members is the most important technology for modular construction. In this paper, image-based modeling and rendering (IBMR) technology was adopted for 3D modeling of precast elements. It is necessary to use match-casting method for precast post-tensioned column assembly. Preassembly using 3D models created by image processing can minimize construction error. Augmented reality devices are used to check the geometry of the segment. Laboratory-scale tests were performed. The proposed process has been applied to the real precast bridge pier segments.

Panoramic Navigation using Orthogonal Cross Cylinder Mapping and Image-Segmentation Based Environment Modeling (직각 교차 실린더 매핑과 영상 분할 기반 환경 모델링을 이용한 파노라마 네비게이션)

  • 류승택;조청운;윤경현
    • Journal of KIISE:Computer Systems and Theory
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    • v.30 no.3_4
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    • pp.138-148
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    • 2003
  • Orthogonal Cross Cylinder mapping and segmentation based modeling methods have been implemented for constructing the image-based navigation system in this paper. The Orthogonal Cross Cylinder (OCC) is the object expressed by the intersection area that occurs when a cylinder is orthogonal with another. OCC mapping method eliminates the singularity effect caused in the environment maps and shows an almost even amount of area for the environment occupied by a single texel. A full-view image from a fixed point-of-view can be obtained with OCC mapping although it becomes difficult to express another image when the point-of-view has been changed. The OCC map is segmented according to the objects that form the environment and the depth value is set by the characteristics of the classified objects for the segmentation based modeling. This method can easily be implemented on an environment map and makes the environment modeling easier through extracting the depth value by the image segmentation. An environment navigation system with a full-view can be developed with these methods.

Image Content Modeling for Meaning-based Retrieval (의미 기반 검색을 위한 이미지 내용 모델링)

  • 나연묵
    • Journal of KIISE:Databases
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    • v.30 no.2
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    • pp.145-156
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    • 2003
  • Most of the content-based image retrieval systems focuses on similarity-based retrieval of natural picture images by utilizing color. shape, and texture features. For the neuroscience image databases, we found that retrieving similar images based on global average features is meaningless to pathological researchers. To realize the practical content-based retrieval on images in neuroscience databases, it is essential to represent internal contents or semantics of images in detail. In this paper, we present how to represent image contents and their related concepts to support more useful retrieval on such images. We also describe the operational semantics to support these advanced retrievals by using object-oriented message path expressions. Our schemes are flexible and extensible, enabling users to incrementally add more semantics on image contents for more enhanced content searching.