• Title, Summary, Keyword: Information Projection

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Projection mapping onto multiple objects using a projector robot

  • Yamazoe, Hirotake;Kasetani, Misaki;Noguchi, Tomonobu;Lee, Joo-Ho
    • Advances in robotics research
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    • v.2 no.1
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    • pp.45-57
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    • 2018
  • Even though the popularity of projection mapping continues to increase and it is being implemented in more and more settings, most current projection mapping systems are limited to special purposes, such as outdoor events, live theater and musical performances. This lack of versatility arises from the large number of projectors needed and their proper calibration. Furthermore, we cannot change the positions and poses of projectors, or their projection targets, after the projectors have been calibrated. To overcome these problems, we propose a projection mapping method using a projector robot that can perform projection mapping in more general or ubiquitous situations, such as shopping malls. We can estimate a projector's position and pose with the robot's self-localization sensors, but the accuracy of this approach remains inadequate for projection mapping. Consequently, the proposed method solves this problem by combining self-localization by robot sensors with position and pose estimation of projection targets based on a 3D model. We first obtain the projection target's 3D model and then use it to accurately estimate the target's position and pose and thus achieve accurate projection mapping with a projector robot. In addition, our proposed method performs accurate projection mapping even after a projection target has been moved, which often occur in shopping malls. In this paper, we employ Ubiquitous Display (UD), which we are researching as a projector robot, to experimentally evaluate the effectiveness of the proposed method.

Finite-state projection vector quantization applied to mean-residual compression of images (평균-잔류신호 영상압축에 적용된 유한 상태 투영벡터양자화)

  • 김철우;이충웅
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.9
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    • pp.2341-2348
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    • 1996
  • This paper proposes an image compression algorithm that adopts projection scheme on mean-residual metod. Sub-blocks of an image are encoded using mean-residual method where mean value is predicted according to that of neighboring blocks. Projection scheme with 8 directions is applied to the compression of residual signals of blocks. Projection vectors are finite-state vector quantized according to the projection angle of nighboring blocks in order to exploit the correlation among them. Side information to represent the repetition of projection is run-length coded while the information for projection direction is compressed using entropy encoding. The proposed scheme apears to be better in PSNR performance when compared with conventional projection scheme as well as in subjective quality preserving the edges of images better than most tranform methods which usually require heavy computation load.

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An approximated implementation of affine projection algorithm using Gram-Scheme orthogonalization (Gram-Schmidt 직교화를 이용한 affine projection 알고리즘의 근사적 구현)

  • 김은숙;정양원;박선준;박영철;윤대희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.24 no.9B
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    • pp.1785-1794
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    • 1999
  • The affine projection algorithm has known t require less computational complexity than RLS but have much faster convergence than NLMS for speech-like input signals. But the affine projection algorithm is still much more computationally demanding than the LMS algorithm because it requires the matrix inversion. In this paper, we show that the affine projection algorithm can be realized with the Gram-Schmidt orthogonalizaion of input vectors. Using the derived relation, we propose an approximate but much more efficient implementation of the affine projection algorithm. Simulation results show that the proposed algorithm has the convergence speed that is comparable to the affine projection algorithm with only a slight extra calculation complexity beyond that of NLMS.

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Analysis of Image Visibility in Projection-type Integral Imaging System without Diffuser

  • Park, Soon-Gi;Song, Byoung-Sub;Min, Sung-Wook
    • Journal of the Optical Society of Korea
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    • v.14 no.2
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    • pp.121-126
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    • 2010
  • We analyze image visibility of a projection-type integral imaging system without diffuser, in terms of the fill factor, which is determined by the relationship between the exit pupil of the projection system and the size and the focal length of the elemental lens. High fill factor is a requirement for good visibility. Moreover, for psychological reasons, for the same fill factor, better visibility is accomplished using a relatively small elemental lens. In this paper, we study image visibility through basic experiments and results.

Pyramid Image Coding Using Projection (투영을 이용한 피라미드 영상 부호화)

  • 원용관;김준식;박래홍
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.30B no.5
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    • pp.90-102
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    • 1993
  • In this paper, we propose a prgressive image transmission technique using hierarchical pyramid data structure which is constructed based on the projection data of an image. To construct hierarchical Gaussian pyramids, we first divide an image into 4$\times$4 subblocks and generate the projection data of each block along the horizontal, vertical, diagonal, and antidiagonal directions. Among images reconstructed by backprojecting the projection data along a single direction, the one giving the minimum distortion is selected. The Gaussian pyramid is recursively generated by the proposed algorithm and the proposed Gaussian images are shown to preserve edge information well. Also, based on the projection concept a new transmission scheme of the lowest Laplacian plane is presented. Computer simulation shows that the quantitative performance of the proposed pyramid coding technique using projection concept is similar to those of the conventional methods with transmission rate reduced by 0.1 ~ 0.2 bpp and its subjective performance is shown to be better due to the edge preserving property of a projection operation.

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Single Frame Based Super Resolution Algorithm Using Improved Back Projection Method and Edge Map Interpolation (개선된 Back Projection 기법과 에지맵 보간을 이용한 단일 영상 기반 초해상도 알고리즘)

  • Choi, Yu-Jung;Kim, Yoon
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.264-267
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    • 2015
  • 본 논문에서는 개선된 고속의 Back Projection 기법과 에지맵 보간을 이용한 단일영상 기반의 초해상도(super resolution) 영상을 생성하는 알고리즘을 제안한다. 본 논문에서 제안하는 알고리즘은 영상의 색채 왜곡을 방지하기 위해 RGB 컬러 도메인에서 HSV 컬러 도메인으로 변경하여 밝기정보인 V만 이용한다. 먼저 잡음제거와 속도 향상을 위해 개선된 고속 back projection을 이용해 영상을 확대 재구성한다. 이와 함께 LoG(laplacian of gaussian) 필터링을 이용하여 에지 맵을 추출한다. 에지의 정보와 back projection의 결과를 이용하여 고해상도 영상을 재구성한다. 제안하는 알고리즘을 이용하여 복원한 영상은 부자연스러운 인공물을 효과적으로 제거하고, blur현상을 줄여 에지 정보를 보정하고 강조해준다. 또한 실험을 통해 제안하는 알고리즘이 기존의 보간법과 전통적인 back projection 결과보다 주관적인 화질이 우수하고 객관적으로 우수한 성능을 나타내는 것을 입증한다.

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Establishment of New Single Origin Plane Rectangular Coordinate System in Korea (한국의 새로운 단일원점 평면직각좌표계 설정)

  • Kim, Tae Woo;Yun, Hong Sik;Lee, Dong Ha;Kim, Gun Soo;Koh, Young Chang
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.31 no.3
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    • pp.183-192
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    • 2013
  • As a worldwide trend, the spatial information that is established by country, institution and purpose is integrated into the data with a single spatial reference to improve the data connectivity and usability. In this study, a new national single origin plane rectangular coordinate system was studied to efficiently respond to the changes in the spatial reference according to the introduction of a new national geodetic standard and to the demand of seamless data service in the spatial information sector. For this purpose, the Korean Peninsula was set as the projection region and the projection distortion in the projection region was analyzed. The projection parameters were defined to homogenize and minimize the projection distortion, and their standardization and registration on the international organizations were conducted. The study on the required optimal projection equation resulted in the Hooijberg projection equation and projection parameters (${\Phi}$, ${\lambda}$, K, N, E) resulted in $38^{\circ}N$ and $128^{\circ}E$ projection origin, and a scale factor of 0.99924. The proper false northing and easting were 700,000m N and 400,000m E, respectively, considering the introduction of country station index system.

Design and implementation of the early projection in BADA-II (바다-II에서 조기 프로젝션의 설계와 구현)

  • 김정아;박영철
    • Proceedings of the Korean Information Science Society Conference
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    • pp.208-210
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    • 2003
  • 기존의 바다-II는 늦은 프로젝션(late projection) 기법을 사용하기 때문에 중간 임시 결과 파일의 디스크 쓰기와 디스크 읽기에 많은 디스크 자원, 메모리 자원, 그리고 CPU 시간이 소모되었다. 본 논문은 바다-II에 조기 프로젝션(early projection) 기법의 설계와 구현 그리고 그에 따른 성능 향상을 보인다.

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On Linear Discriminant Procedures Based On Projection Pursuit Method

  • Hwang, Chang-Ha;Kim, Dae-Hak
    • Journal of the Korean Data and Information Science Society
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    • v.5 no.1
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    • pp.1-10
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    • 1994
  • Projection pursuit(PP) is a computer-intensive method which seeks out interesting linear projections of multivariate data onto a lower dimension space by machine. By working with lower dimensional projections, projection pursuit avoids the sparseness of high dimensional data. We show through simulation that two projection pursuit discriminant mothods proposed by Chen(1989) and Huber(1985) do not improve very much the error rate than the existing methods and compare several classification procedures.

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Implementation of Interactive Chinese Traditional Instrument using Laser Diode and Light Sensor (레이저 다이오드 및 빛센서를 이용한 인터랙티브 중국 전통악기 구현)

  • Yang, Wei-Tian;Lee, Kang-Hee
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.381-383
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    • 2013
  • This paper introduces what the interactive projection technology is, and how to use this technology to make a musical instrument. There have been many art works and business products completed by the interactive projection technology, but this technology seldom has been used in the musical field, so we want to make a simple instrument by interactive projection technology, and expect more people to develop this field in the future.

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