• 디지털융복합연구
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• 제15권3호
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• pp.195-200
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• 2017

본 연구는 시뮬레이터 카메라 가상제어형 CG적용 영상제작시스템을 제공하는 것이 목적이다. 본 연구에서 제시하는 영상제작시스템은 촬영현장의 시뮬레이터 카메라와 CG적용 영상편집이 이루어지는 그래픽 툴의 가상카메라가 서로 동기화되도록 하고, 시뮬레이터 카메라의 위치, 움직임, 이동, 렌즈설정이 그래픽 툴에서 제공하는 카메라 제어 인터페이스를 통해 가상적으로 제어되도록 하여 그래픽 툴을 통해서 간편하고 용이하게 수행할 수 있는 시스템이다. 동서대학교 창작 애니메이션인 블레이즈 나이츠(Blaze Knights)를 사례로 하여, 시스템 적용전과 적용후의 진행율 및 작업양을 비교하여 연구결과의 우수성을 부각하였다. 연구결과에 따라 CG 아티스트의 작업효율이 증대되는 동시에 CG적용 영상의 장면 연출시 물리적 제약이 최소화되면서, 다양한 장면 연출의 가능 및 실사 촬영이후 영상 편집단계에서 요구될 수 있는 재촬영 분량도 최소화등 VFX업계에 기여도가 높을 것으로 기대한다.

• Ocean Systems Engineering
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• 제1권3호
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• pp.195-205
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• 2011

A method for calibrating a laser profiling system for seafloor micro-topography measurements is described. The system consists of a digital camera and an arrangement of six red lasers that are mounted as a unit on a remotely operated vehicle (ROV). The lasers project as parallel planes onto the seafloor, creating profiles of the local topography that are interpreted from the digital camera image. The goal of the calibration was to determine the plane equations for the six lasers relative to the camera. This was accomplished in two stages. First, distortions in the digital image were corrected using an interpolation method based on a virtual pinhole camera model. Then, the laser planes were determined according to their intersections with a calibration target. The position and orientation of the target were obtained by a registration process. The selection of the target shape and size was found to be critical to a successful calibration at sea, due to the limitations in the manoeuvrability of the ROV.

• 디지털콘텐츠학회 논문지
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• 제8권3호
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• pp.365-370
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• 2007

본 논문에서는 환경 탐색을 위한 영상 기반 환경을 자동으로 생성하기 위한 새로운 모자이크 기법을 제안 한다. 제안된 방법은 영상의 투영 변환 행렬을 이용하여 한 영상 위에 다른 영상을 합성 한다. 특징 모델을 기반한 정합을 이용하여 영상을 모자이크를 구현하고 구맵핑을 통해 시각에 따라 변형되어 몰입감을 주는 영상 기반 환경을 생성한다, 특히, 취득한 영상간의 카메라 회전 성분에 강건한 기준 특징 벡터 필터링 방법을 제안하며 실험을 통해 그 유용성을 검증한다.

• 한국멀티미디어학회논문지
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• 제24권11호
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• pp.1518-1525
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• 2021

Due to the growth of VR industry and rise of digital twin industry, the importance of implementing 3D data same as real space is increasing. However, the fact that it requires expertise personnel and huge amount of time is a problem. In this paper, we propose a system that generates point cloud data with same shape and color as a real space, just by scanning the space. The proposed system integrates 3D geometric information from lidar and color information from stereo camera into one point cloud. Since the number of 3D points generated by lidar is not enough to express a real space with good quality, some of the pixels of 2D image generated by camera are mapped to the correct 3D coordinate to increase the number of points. Additionally, to minimize the capacity, overlapping points are filtered out so that only one point exists in the same 3D coordinates. Finally, 6DoF pose information generated from lidar point cloud is replaced with the one generated from camera image to position the points to a more accurate place. Experimental results show that the proposed system easily and quickly generates point clouds very similar to the scanned space.

• ETRI Journal
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• 제26권6호
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• pp.597-604
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• 2004

In stereoscopic television, there is a trade-off between visual comfort and 3-dimensional (3D) impact with respect to the baseline-stretch of a 3DTV camera. It is necessary to adjust the baseline-stretch at an appropriate the distance depending on the contents of a scene if we want to obtain a subjectively optimal quality of an image. However, it is very hard to obtain a small baseline-stretch using commercially available cameras of broadcasting quality where the sizes of the lens and CCD module are large. In order to overcome this limitation, we attempt to freely control the baseline-stretch of a stereoscopic camera by synthesizing the virtual views at the desired location of interval between two cameras. This proposed technique is based on the stereo matching and view synthesis techniques. We first obtain a dense disparity map using a hierarchical stereo matching with the edge-adaptive multiple shifted windows. Then, we synthesize the virtual views using the disparity map. Simulation results with various stereoscopic images demonstrate the effectiveness of the proposed technique.

• 대한공간정보학회지
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• 제10권2호
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• pp.49-56
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• 2002

3D 가상도시 구축에 있어 사용자로 하여금 공간 객체 중심으로 지형 지물을 인식할 수 있게 해 줄 수 있는 요소로서 Texture Image를 들 수 있다. 본 연구에서는 디지틀 카메라를 통하여 건물 측면 Texture Image를 획득하고 이렇게 획득한 이미지가 가지고 있는 왜곡을 2D Projective Transformation방법을 사용하여 보정하였다. 보정이 끝난 Texture Image는 OpenGL을 이용하여 3D 건물 모델에 Mapping을 실시하였다. 본 연구를 통해 개발한 응용 프로그램은 가상도시를 구축하는 과정상에 자동화된 방법을 제공할 수 있다.

• 디지털산업정보학회논문지
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• 제7권2호
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• pp.91-100
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• 2011

Free viewpoint TV can provide multi-angle view point images for viewer needs. In the real world, But all angle view point images can not be captured by camera. Only a few any angle view point images are captured by each camera. Group of the captured images is called multi-view image. Therefore free viewpoint TV wants to production of virtual sub angle view point images form captured any angle view point images. Interpolation methods are known of this problem general solution. To product interpolated view point image of correct angle need to depth image of multi-view image. Unfortunately, multi-view video including depth image is necessary to develop a new compression encoding technique for storage and transmission because of a huge amount of data. Layered depth image is an efficient representation method of multi-view video data. This method makes a data structure that is synthesis of multi-view color and depth image. This paper proposed enhanced compression method using layered depth image representation and H.264/AVC video coding technology. In experimental results, confirmed high compression performance and good quality reconstructed image.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 춘계학술대회 논문집
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• pp.255-259
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• 2003

Moire topography method isa well-known non-contacting 3-D measurement method as afast non-contact test for three-dimension shape measuring method. Recently, it's important to study the automatic three-dimension measurement by moire topography because it is frequently applied to the reverse engineering , the medical , the entertainment fields. Three-dimension measurement using projection of moire topography is very attractive because of its high measuring speed and high sensitivity. In this paper, the classical moire method is computerized-so called digital moire when a virtual grating pattern is projected on a surface, the captured image by the CCD camera has three-dimension information of the objects. The moire image can be obtained through a simple image processing and a reference grating pattern. and it provides similar results without physical grating pattern. digital projection moire topography turn out to be very effective for the three-dimension measurement of objects. Using different N-bucket algorithm method of digital projection moire topography is tested to measuring object with the 2-ambiguity problem. Experimental results prove that the proposed scheme is capable of finding measurement errors that decreased more by using the four-three step algorithm method instead of the same step in the phase shifting of different pitch.

• Journal of information and communication convergence engineering
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• 제9권1호
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• pp.117-123
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• 2011

This paper is for investigation and analysis of how a visual studio is widely used by domestic broadcasting companies and broadcasting companies' production environment. The history of a visual studio goes back to start of computer graphic. A visual studio is a way to produce a program using graphic sets created by a computer rather than actual setting, and it allows to express beyond limitations of actual studio settings and various imagery visual effects can be created by a computer. A visual studio can create 3-dimensional graphic and these graphics can be inter-locked with actual camera images to make visual spaces for various programs. These flows are aiming to achieve very natural image which is hard to distinguish it is artificially created rather than just to produce programs with simple image synthesis, and this paper analyzes the producing changes of domestic broadcasting visual studios as well as its usage and suggests the idealist direction for developing the production.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2007년도 동계학술대회
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• pp.68-71
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• 2007

자연스러운 가상현실 제작을 위해서는 정확한 카메라 보정(camera calibration) 과정이 필수적인 선결 조건으로 요구된다. 그러나 기존의 영상처리에 의한 카메라 보정 방식은 특징점 추출에서의 에러 발생과 여러 장의 영상을 촬영해야 하는 등의 단점으로 줌렌즈 카메라 보정에는 사용되기 힘들었다. 본 논문에서는 카메라보정 객체의 모델에 기반하여 카메라 파라미터를 최적화하는 방법으로 카메라 보정을 구현하였다 최적화 방법으로는 경사기반 방식에 비해 국부최적점에 강인한 것으로 알려진 유전자알고리즘(genetic algorithm)을 사용하였다. 카메라 보정 객체에 낮은 공간주파수성분을 보강하고, 목적함수에 영상의 밝기 정보를 포함하며, 유전자알고리즘을 사용함으로써 초기치가 최적점에서 멀리 떨어져있는 경우에도 수렴이 가능함을 실험적으로 확인하였다.