• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 춘계학술발표대회
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• pp.355-358
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• 2012

Although quality metrics for 2D video quality assessment have been proposed, the quality models on stereoscopic video have not been widely studied. In this paper, a new objective video quality metric for s tereoscopic video is proposed. The proposed algorithm consider three factors to evaluate stereoscopic video quality: blocking artifact, blurring artifact, and the difference between left and right view of stereoscopic vide o. The results show that the proposed algorithm has a higher correlation with DMOS than the others.

• 방송공학회논문지
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• 제14권2호
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• pp.197-209
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• 2009

스테레오 영상은 기존의 영상과는 달리 사용자에게 깊이감을 제공한다. 따라서 스테레오 영상을 평가하기 위해서는 새로운 화질평가 모델이 필요하다. 본 논문에서는 스테레오 영상을 위한 객관적 화질평가 방법을 제안한다. 제안된 화질평가 방법은 기존의 화질평가 모델을 기반으로 하여 블로킹 현상과 경계 영역에서의 열화 현상을 검출하였으며, 깊이 정보를 고려하여 시점 간 화질 격차 검출을 통해 알고리즘의 성능을 높이고자 하였다. 제안된 알고리즘의 성능 확인을 위해 스테레오 영상의 주관적 화질평가를 수행하였으며 주관적 화질평가와의 상관성 측면에서 제안 알고리즘이 PSNR에 비해 우수함을 확인하였다.

• 한국철도학회논문집
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• 제8권6호
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• pp.559-565
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• 2005

In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed designed for providing flexible video among various displays, such ass control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC coding scheme predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service, we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. The experimental results show the efficiency of proposed coding scheme by comparison with already known methods and the advantages of disparity estimation in terms of scalability overhead. According to the experimental results, we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2407-2410
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• 2003

In this paper, we propose a new stereoscopic video conversion methodology that converts two-dimensional (2-D) MPEG-4 video to stereoscopic video. In MPEG-4, each Image is composed of background object and primary object. In the first step of the conversion methodology, the camera motion type is determined for stereo Image generation. In the second step, the object-based stereo image generation is carried out. The background object makes use of a current image and a delayed image for its stereo image generation. On the other hand, the primary object uses a current image and its horizontally-shifted version to avoid the possible vertical parallax that could happen. Furthermore, URFA(Uncovered Region Filling Algorithm) is applied in the uncovered region which might be created after the stereo image generation of a primary object. In our experiment, show MPEG-4 test video and its stereoscopic video based upon out proposed methodology and analyze Its results.

• ETRI Journal
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• 제34권5호
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• pp.666-673
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• 2012

Non-real-time delivery of stereoscopic video has been considered as a service scenario for 3DTV to overcome the limited bandwidth in the terrestrial digital television system. A hybrid codec combining MPEG-2 and H.264/AVC has been suggested for the compression of stereoscopic video for 3DTV. In this paper, we propose a stereoscopic video coding scheme using adaptive pre-/post-filters (APPF) to improve the quality of 3D video while retaining compatibility with legacy video coding standards. The APPF are applied adaptively to blocks of various sizes determined by the macroblock coding mode and reference frame index. Experiment results show that the proposed method achieves up to 24.86% bit rate savings relative to a hybrid codec of MPEG-2 and H.264/AVC including the inter-view prediction.

• 방송공학회논문지
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• 제18권2호
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• pp.261-270
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• 2013

스테레오스코픽(stereoscopic) 3D 비디오 서비스는 기존 2D와의 호환성을 유지하면서 새로운 3D 비디오 서비스를 제공할 수 있다. 전송 대역이 제한된 지상파 방송의 경우 높은 부호화 효율을 갖는 스테레오스코픽 비디오 코덱이 요구된다. 따라서 기준영상은 기존 2D 비디오 서비스와의 호환성을 위해 MPEG-2로 부호화하는 반면 3D를 위한 부가영상 부호화를 위해 부호화 효율이 높은 H.264/AVC, HEVC(High Efficiency Video Coding) 등을 고려하고 있으며, 또한 부가영상을 비실시간으로 전송하는 NRT(Non-Real Time) 3D 서비스도 고려되고 있다. 본 논문에서는 NRT 3D 서비스를 위한 스테레오스코픽 비디오 부호화에 있어서, HEVC에서 고려되었던 적응루프필터(ALF: Adaptive Loop Filter)를 전/후처리 필터로 적용하는 기법을 제시한다. 특히, 부가영상의 후처리에 ALF를 적용하기 위하여 부호화 과정에 결정되는 CU(Coding Unit) 구조를 이용하는 HEVC와 달리 MVC(Multiview Video Coding)로 부호화한 부가영상의 매크로블록(MB) 부호화 모드 및 참조영상 인덱스 등의 MB 부호화 정보를 이용한 ALF 적용 기법을 제안한다. 부가 영상 부호화에 있어서 제안한 기법으로 전처리 및 후처리 과정으로 ALF를 적용함으로써 최대 약 24.9%의 비트율 감소를 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.484-486
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• 2005

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they falloff from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and stereo camera sensors. In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed scheme is designed for providing flexible video among various displays, such as control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC for predicting the P- and B-types of frames of the right-view sequence. IBMDC predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service. we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. According to the experimental results. we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

• ETRI Journal
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• 제32권6호
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• pp.961-964
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• 2010

This letter introduces a stereoscopic video broadcasting system that provides 3D visual service and has full backward compatibility with legacy digital television (DTV) service in the same channel capacity. The proposed stereoscopic video broadcasting system in this letter is composed of both a hybrid codec and a multiplexer with a newly defined stereoscopic-related signaling method. In conclusion, the proposed method can be effectively applied for 3D broadcasting services without major changes in legacy broadcasting platforms.

• ETRI Journal
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• 제27권3호
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• pp.326-329
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• 2005

The MPEG-4 multiple auxiliary component (MAC) is a good mechanism to achieve one-stream stereoscopic video coding. However, there is no syntax or semantics for the residual texture data of the disparity-compensated image in the current MAC. Therefore, we propose a novel disparity-compensated coding method using the MAC for stereoscopic video. We also define a novel MAC semantics in MPEG-4 so as to support the proposed coding algorithm. The major difference between the existing and proposed coding methods using the MAC is the addition of the residual texture coding.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.67-70
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• 2009

This paper proposes an algorithm for creating stereoscopic video from a monoscopic video. A viewer uses depth perception clues called a vanishing point which is the farthest from a viewer's viewpoint in order to perceive depth information from objects and surroundings thereof to the viewer. The viewer estimates the vanishing point with geometrical features in monoscopic images, and can perceive the depth information with the relationship between the position of the vanishing point and the viewer's viewpoint. In this paper, we propose a method to estimate a vanishing point with edge direction histogram in a general monoscopic image and to create a depth map depending on the position of the vanishing point. With the conversion method proposed through the experiment results, it is seen that stable stereoscopic conversion of a given monoscopic video is achieved.