• Title, Summary, Keyword: Field of view

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Human Detection in Overhead View and Near-Field View Scene

  • Jung, Sung-Hoon;Jung, Byung-Hee;Kim, Min-Hwan
    • Journal of Korea Multimedia Society
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    • v.11 no.6
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    • pp.860-868
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    • 2008
  • Human detection techniques in outdoor scenes have been studied for a long time to watch suspicious movements or to keep someone from danger. However there are few methods of human detection in overhead or near-field view scenes, while lots of human detection methods in far-field view scenes have been developed. In this paper, a set of five features useful for human detection in overhead view scenes and another set of four useful features in near-field view scenes are suggested. Eight feature-candidates are first extracted by analyzing geometrically varying characteristics of moving objects in samples of video sequences. Then highly contributed features for each view scene to classifying human from other moving objects are selected among them by using a neural network learning technique. Through experiments with hundreds of moving objects, we found that each set of features is very useful for human detection and classification accuracy for overhead view and near-field view scenes was over 90%. The suggested sets of features can be used effectively in a PTZ camera based surveillance system where both the overhead and near-field view scenes appear.

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A Comparative Analysis of Field and Slide Survey on Subjective Image of the Nightscape (야경의 주관적 이미지에 관한 현지평가와 슬라이드평가의 비교분석)

  • Ahn, Hyun Tae;Moon, Ki Hoon;Kim, Jeong Tai
    • KIEAE Journal
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    • v.7 no.2
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    • pp.31-37
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    • 2007
  • Despite of many supportive research to the usefulness of slide evaluation on environment of outdoor lighting, study method of using slides have provoked many discussions of its manifestation of reality of field conditions. This study aims to compare the results of slide survey with that of field survey. Distant view and short range view of nightscape of Seoul were selected. Field measurement of luminance and chromaticity were conducted and questionnaire survey were conducted. Frequency analysis, T-test, factor analysis were conducted. Results shows that distant view and short range view of field survey have better visual atmosphere than slide survey. In addition, slide survey on distant view shows lowest values. Difference between field survey and slide survey on distant view is much bigger than the results of short range view.

Hopfield Network for Partitioning of Field of View (FOV 분할을 위한 Hopfield Network)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.2
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    • pp.120-125
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    • 2002
  • An optimization approach is used to partition the field of view. A cost function is defined to represent the constraints on the solution, which is then mapped onto a two-dimensional Hopfield neural network for minimization. Each neuron in the network represents a possible match between a field of view and one or multiple objects. Partition is achieved by initializing each neuron that represents a possible match and then allowing the network to settle down into a stable state. The network uses the initial inputs and the compatibility measures between a field of view and one or multiple objects to find a stable state.

Partitioning of Field of View by Using Hopfield Network (홉필드 네트워크를 이용한 FOV 분할)

  • Cha, Young-Youp;Choi, Bum-Sick
    • Proceedings of the KSME Conference
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    • pp.667-672
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    • 2001
  • An optimization approach is used to partition the field of view. A cost function is defined to represent the constraints on the solution, which is then mapped onto a two-dimensional Hopfield neural network for minimization. Each neuron in the network represents a possible match between a field of view and one or multiple objects. Partition is achieved by initializing each neuron that represents a possible match and then allowing the network to settle down into a stable state. The network uses the initial inputs and the compatibility measures between a field of view and one or multiple objects to find a stable state.

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Design of Infrared Camera for Extended Field of View (시야 확장형 적외선카메라 설계)

  • Lee, Yong-chun;Song, Chun-ho;Kim, Sang-woon;Kim, Young-kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.699-701
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    • 2017
  • Typical operating method for long-range observation cameras are to detect the target at a wide angle of view and to recognize/identify the target with a telephoto angle of view. And the detection/recognition range performance is an important item to evaluate the performance of the defense infrared camera. To increased the detection range performance, the camera's field of view should be narrowed. Due to the narrow field of view, the probability of finding target is relatively low. In this paper, we propose a method to search for target by providing a wide angle view while maintaining detection range performance. M&S and optimized design were used to develop infrared camera with extended field of view and the results of the test summarized.

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Accurate Localization of Metal Electrodes Using Magnetic Resonance Imaging (자기공명영상을 이용한 금속전극의 정확한 위치 결정)

  • Joe, Eun-Hae;Ghim, Min-Oh;Ha, Yoon;Kim, Dong-Hyun
    • Investigative Magnetic Resonance Imaging
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    • v.15 no.1
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    • pp.11-21
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    • 2011
  • Purpose : Localization using MRI is difficult due to susceptibility induced artifacts caused by metal electrodes. Here we took an advantage of the B0 pattern induced by the metal electrodes by using an oblique-view imaging method. Materials and Methods : Metal electrode models with various diameters and susceptibilities were simulated to understand the aspect of field distortion. We set localization criteria for a turbo spin-echo (TSE) sequence usingconventional ($90^{\circ}$ view) and $45^{\circ}$ oblique-view imaging method through simulation of images with various resolutions and validated the criteria usingphantom images acquired by a 3.0T clinical MRI system. For a gradient-refocused echo (GRE) sequence, which is relatively more sensitive to field inhomogeneity, we used phase images to find the center of electrode. Results : There was least field inhomogeneity along the $45^{\circ}$ line that penetrated the center of the electrode. Therefore, our criteria for the TSE sequence with $45^{\circ}$ oblique-view was coincided regardless of susceptibility. And with $45^{\circ}$ oblique-view angle images, pixel shifts were bidirectional so we can detect the location of electrodes even in low resolution. For the GRE sequence, the $45^{\circ}$ oblique-view anglemethod madethe lines where field polarity changes become coincident to the Cartesian grid so the localization of the center coordinates was more facilitated. Conclusion : We suggested the method for accurate localization of electrode using $45^{\circ}$ oblique-view angle imaging. It is expected to be a novelmethodto monitoring an electrophysiological brain study and brain neurosurgery.

Preference Analysis of the View in an Apartment Unit according to the Location of View Target (조망 대상 위치에 따른 아파트 단위세대 조망 경관 선호 특성 분석)

  • Moon Ji-Won;Ha Jae-Myung
    • Journal of the Korean housing association
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    • v.17 no.3
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    • pp.99-109
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    • 2006
  • The purpose of this study was to analyze the characteristic of each view in an apartment unit in terms of the quality. This study was accomplished by two research methods; the field survey on 181 apartment complexes in Daegu, and the preference evaluation on 24 cases sampled in the sense of its location, i.e. inside or outside of a complex. In the field survey, view targets were categorized into various items such as a building, a road, a mountain, a tree, another apartment, the sky, and so on, and the characteristics of the distance from a viewer to view targets and view of the level in an apartment were analyzed. In the preference evaluation, 24 cases, each one has one of the follows; the natural view, the artificial view, and the combined view of the both, were chosen and those were evaluated by 167 interviewees. As a result, the conclusions from the study were drawn as follows; 1) The view, the combination of buildings, roads, mountains, trees, apartments, and the sky, is usually seen in an apartment unit. 2) The type of view target is more significant to a person than its location. 3) The natural and combined view are preferred to the artificial one. 4) In the case of the same outside view, a person likes the open view more than the somewhat covered one.

A Study on FOV for developing 3D Game Contents (3D게임 콘텐츠 개발을 위한 시야각(FOV) 연구)

  • Lee, Hwan-joong;Kim, young-bong
    • Proceedings of the Korea Contents Association Conference
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    • pp.163-168
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    • 2009
  • Since 3D gamers can control points of view and field of view freely, 3D games generate high realities and immersions. On most of 3D games, a point of view and a field of view are determined by positions and FOV(field of view) of camera. Although FOV is a simple technical factor, it leads to graphics distortion and affects immersion of the game and causes some gamers to get physical sickness. Therefore, we will suggest the instruction to operate FOVs in many 3D games by examining and analysing various rendering results with control of FOV and real cases of FOV in published games with same 3D modeling environments.

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Ultra Precision Machining Technology Development of Subminiature Optics of Proximity and Wide Field of View (초정밀 가공기를 이용한 근접초소형 광시야각 광학계 기술 개발)

  • Kim, M.S.;Yang, S.C.;Kim, H.S.;Kim, G.H.
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.7 no.4
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    • pp.96-101
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    • 2008
  • Due to improve form accuracy and surface roughness of a aspheric lens core that is made of Ni, the study is carried out on localization about a Subminiature Optics of Proximity and Wide Field of View. The required form accuracy P-V $0.2{\mu}m$ and surface roughness is Ra 10 nm. The design of experiment(DOE) is adopted to find a optimal cutting conditions which are spindle speed, depth of cut, feedrate. Finally, the effects of this study are replacing importation and strengthening competitiveness through the localization of the Subminiature Optics of Proximity and Wide Field of View.

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A Novel Visual Servoing Approach For Keeping Feature Points Within The Field-of-View (특징점이 Field of View를 벗어나지 않는 새로운 Visual Servoing 기법)

  • Park, Do-Hwan;Yeom, Joon-Hyung;Park, Noh-Yong;Ha, In-Joong
    • Proceedings of the KIEE Conference
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    • pp.322-324
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    • 2007
  • In this paper, an eye-in-hand visual servoing strategy for keeping feature points within the FOV(field-of-view) is proposed. We first specify the FOV constraint which must be satisfied to keep the feature points within the FOV. It is expressed as the inequality relationship between (i) the LOS(jine-of-sight) angles of the center of the feature points from the optical axis of the camera and (ii) the distance between the object and the camera. We then design a nonlinear feedback controller which decouples linearly the translational and rotational control loops. Finally, we show that appropriate choice of the controller gains assures to satisfy the FOV constraint. The main advantage of our approach over the previous ones is that the trajectory of the camera is smooth and circular-like. Furthermore, ours can be applied to the large camera displacement problem.

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