• Title/Summary/Keyword: Viewpoint Estimation

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Study on Viewpoint Estimation for Moving Parallax Barrier 3D Display (이동형 패럴랙스 배리어 방식의 모바일 3D 디스플레이를 위한 시역계측기술에 관한 연구)

  • Kim, Gi-Seok;Cho, Jae-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.1
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    • pp.7-12
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    • 2012
  • In this paper, we present an effective viewpoint estimation algorithm for the Moving parallax barrier method of 3D display mobile device. Moving parallax barrier is designed to overcome the biggest problem, the limited view angle. To accomplish it, the position of the viewer's eyes or face should be estimated with strong stability and no latency. We focus on these requirements in the poor performance of mobile processors. We used a pre-processing algorithm in order to overcome the various illumination changes. And, we combined the conventional Viola-Jones face detection method and Optical-flow algorithm for robust and stable viewpoint estimation. Various computer simulations prove the effectiveness of the proposed method.

A Study on Evaluation Method of Fatigue Strength Data Using Likelihood Interval Estimation Method (우도구간 추정법에 의한 피로강도 데이터 평가법에 관한 연구)

  • 최창섭
    • Journal of the Korean Society of Safety
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    • v.10 no.2
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    • pp.10-16
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    • 1995
  • In estimating the fatigue data, only the uniform safety rate has been applied so far However, since more reasonable design concepts such as machine structures or subsidiary materials will be required in the future, the importance of a statistical estimation method for fatigue data is being highlighted. With such basic conception in mind, this study was aimed at critically discussing the interval estimation method which has been applied using the classical statistics thus far It was conceived that this conventional method would result in the estimation of the unstable side from the viewpoint of the likelihood Interval estimation method. In this regard, this study aimed at estimating the fatigue strength through the likelihood interval estimation method comparing it with the conventional interval estimation method would result in the estimation of the unstable side from the viewpoint of the likelihood interval estimation method. One of the methods using the likelihood for estimation data is the Bayes method. Based on this theory, statistical estimations were positivly applied, and thereupon, the fatigue data were estimated.

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RAY-SPACE INTERPOLATION BYWARPING DISPARITY MAPS

  • Moriy, Yuji;Yendoy, Tomohiro;Tanimotoy, Masayuki;Fujiiz, Toshiaki
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2009.01a
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    • pp.583-587
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    • 2009
  • In this paper we propose a new method of Depth-Image-Based Rendering (DIBR) for Free-viewpoint TV (FTV). In the proposed method, virtual viewpoint images are rendered with 3D warping instead of estimating the view-dependent depth since depth estimation is usually costly and it is desirable to eliminate it from the rendering process. However, 3D warping causes some problems that do not occur in the method with view-dependent depth estimation; for example, the appearance of holes on the rendered image, and the occurrence of depth discontinuity on the surface of the object at virtual image plane. Depth discontinuity causes artifacts on the rendered image. In this paper, these problems are solved by reconstructing disparity information at virtual camera position from neighboring two real cameras. In the experiments, high quality arbitrary viewpoint images were obtained.

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Real-time Virtual View Synthesis using Virtual Viewpoint Disparity Estimation and Convergence Check (가상 변이맵 탐색과 수렴 조건 판단을 이용한 실시간 가상시점 생성 방법)

  • Shin, In-Yong;Ho, Yo-Sung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.1A
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    • pp.57-63
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    • 2012
  • In this paper, we propose a real-time view interpolation method using virtual viewpoint disparity estimation and convergence check. For the real-time process, we estimate a disparity map at the virtual viewpoint from stereo images using the belief propagation method. This method needs only one disparity map, compared to the conventional methods that need two disparity maps. In the view synthesis part, we warp pixels from the reference images to the virtual viewpoint image using the disparity map at the virtual viewpoint. For real-time acceleration, we utilize a high speed GPU parallel programming, called CUDA. As a result, we can interpolate virtual viewpoint images in real-time.

Robust Viewpoint Estimation Algorithm for Moving Parallax Barrier Mobile 3D Display (이동형 패럴랙스 배리어 모바일 3D 디스플레이를 위한 강인한 시청자 시역 위치 추정 알고리즘)

  • Kim, Gi-Seok;Cho, Jae-Soo;Um, Gi-Mun
    • Journal of Broadcast Engineering
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    • v.17 no.5
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    • pp.817-826
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    • 2012
  • This paper presents a robust viewpoint estimation algorithm for Moving Parallax Barrier mobile 3D display in sudden illumination changes. We analyze the previous viewpoint estimation algorithm that consists of the Viola-Jones face detector and the feature tracking by the Optical-Flow. The sudden changes in illumination decreases the performance of the Optical-flow feature tracker. In order to solve the problem, we define a novel performance measure for the Optical-Flow tracker. The overall performance can be increased by the selective adoption of the Viola-Jones detector and the Optical-flow tracker depending on the performance measure. Various experimental results show the effectiveness of the proposed method.

Piecewise Linear Fuzzy Random Variables and their Statistical Application

  • WATANABE, Norio;IMAIZUMI, Tadashi
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 1998.06a
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    • pp.696-700
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    • 1998
  • Fuzzy random variables with piecewise linear membership functions are introduced from a practical viewpoint. The estimation of the expected values of these fuzzy random variables is also discussed and statistical application is denonstratied by using a real data set.

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FREE VIEWPOINT IMAGE RECONSTRUCTION FROM 3-D MULTI-FOCUS IMAGING SEQUENCES AND ITS IMPLEMENTATION BY CELL-BASED COMPUTING

  • Yonezawayz, Hiroki;Kodamay, Kazuya;Hamamotoz, Takayuki
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2009.01a
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    • pp.751-754
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    • 2009
  • This paper deals with the Cell-based distributed processing for generating free viewpoint images by merging multiple differently focused images. We previously proposed the method of generating free viewpoint images without any depth estimation. However, it is not so easy to realize real-time image reconstruction based on our previous method. In this paper, we discuss the method to reduce the processing time by dimension reduction for image filtering and Cell-based distributed processing. Especially, the method of high-speed image reconstruction by the Cell processor on SONY PLAYSTATION3(PS3) is described in detail. We show some experimental results by using real images and we discuss the possibility of real-time free viewpoint image reconstruction.

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Improving Current Control Performance by Parameter Estimation of PWM Converter (PWM 컨버터의 상수추정을 통한 전류제어 성능 개선)

  • 이진우
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.286-289
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    • 2000
  • from the viewpoint of model-based current control it is indispensable to use the accurate system parameters for the high control performance. This paper adopts the Least-Squares algorithm as a parameter estimation scheme because it has the fast convergence rate and the low sensitivity to noises. in case of the PI current controller with high gains the simulation results show that the adopted estimation scheme can be successfully applied to PWM converters and also show that the control performance can be improved by using the estimated parameters.

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Parameter Estimation for Digital Current Control of PWM Converters

  • Lee, Jin-Woo
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.149-152
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    • 1998
  • From the viewpoint of model-based current control, it is indispensable to use the accurate system parameters for the high control performance. This paper adopts the Least-Squares algorithm as a parameter estimation scheme because it has the fast convergence rate and the low sensitivity to noises. In case of the intelligent current controller with delay compensator, the simulation results show that the adopted estimation scheme can be successfully applied to PWM converters and also show the improved control performance in the estimated parameters.

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A Video Streaming Scheme for Minimizing Viewpoint Switching Delay in DASH-based Multi-view Video Services (DASH 기반의 다시점 비디오 서비스에서 시점전환 지연 최소화를 위한 비디오 전송 기법)

  • Kim, Sangwook;Yun, Dooyeol;Chung, Kwangsue
    • Journal of KIISE
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    • v.43 no.5
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    • pp.606-612
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    • 2016
  • The multi-view video service based on the DASH(Dynamic Adaptive Streaming over HTTP) switches the viewpoint or object which is selected by the user among the multiple video streams captured by multiple cameras. However, the problem is that the conventional DASH-based multi-view video service takes a long time to switch the viewpoint. The reason is that the conventional scheme switches to the new video stream after consuming all buffered segments of the previous video stream. In this paper, we propose a video streaming scheme for minimizing the viewpoint switching delay in the DASH-based multi-view video service. In order to minimize the viewpoint switching delay, the proposed scheme configures the video streams by controlling the GoP (Group of Pictures) size and controls the client buffer based on bandwidth estimation and playback buffer occupancy. Through the experimental results, we prove that the proposed scheme reduces the viewpoint switching delay.