• Title/Summary/Keyword: Visual navigation

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The Design of Spatial-Temporal Prediction Filter for saving resources on the view navigation of a panoramic video service (파노라마 영상에서 효율적인 시점탐색을 위한 시공간 비디오 스트림 예측 필터 설계 방법에 관한 연구)

  • Seok, Joo-Myoung;Cho, Yong-Woo
    • Journal of Advanced Navigation Technology
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    • v.17 no.6
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    • pp.757-764
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    • 2013
  • A panoramic video which supports to make viewers feel an immersion through fitting to a wide field of view (FOV) larger than the human visual angle needs an interactive viewing method such as selecting targeted view point among widely viewing points of a panoramic video because it difficult to simultaneously view a whole panoramic video due to a limited viewing environment and bandwidth. When a user officially uses a view navigation in order to select a view point, it happens waste of resources such as bandwidth owing to the transmitted video data of unnecessary view points. Therefore, this paper proposes the spatial-temporal prediction filter (STPF) which is based on the direction and velocity of the view navigation for transmitting only the necessary video data. As a result of simulation, STPF reduces bitrate saving rates by from 6% to 37% compared to conventional methods in the interactive panoramic video streaming service required high bandwidth.

항만 경관의 시각적 선호도 분석

  • Yhang, Wii-Joo;Gu, Bon-A
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2007.12a
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    • pp.136-137
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    • 2007
  • This study was to analyze the visual preference of the port landscapes for North port in Busan. Preference related variables came from Semantic Differential(SD) method and then were conducted by the factor analysis. Multiple regression was done for the relationship between the preference and factors. The result found 4 factors, including dynamics, stability, pleasantness and healthiness. Much importance was placed on dynamics among them. Therefore, building port landscapes and their image attracting viewers should consider dynamics in terms of port landscape plan and user attraction development for visual quality management.

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Adaptive Watermarking Algorithm Using Fuzzy Reasoning and Hybrid Scheme (퍼지추론과 혼합기법을 적용한 적응적 워터마킹 알고리즘)

  • Kim, Yoon-Ho;Kim, Tae-Gon
    • Journal of Advanced Navigation Technology
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    • v.12 no.1
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    • pp.74-81
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    • 2008
  • In this paper, adaptive watermarking algorithm which based on fuzzy reasoning and hybrid scheme is presented. To enforce the time and space complexity, hybrid scheme which utilize a color information as well as visual characteristics is also addressed. Proposed approach have double-aim: in first to use the visual characteristics so as to enforce the robustness of watermarking, and in second to select the optimal sub-band which is to be embedded a watermark. One of the principal advantage is that this approach involved the fuzzy inference module which is designed to select an optimal sub-band from the DWT coefficient blocks. In order to demonstrate the effectiveness of proposed algorithm, some numerical experiments of robustness and imperceptibility are evaluated with respect to such attacks as JPEG compression, noise and cropping.

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A Study on Detecting Optimal Corner Points using Morphology and Human Visual Concept (수리 형태학과 인간의 시각적 개념을 이용한 최적의 코너 점 추출을 위한 연구)

  • Jeong, Gi-Ryong
    • Journal of Navigation and Port Research
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    • v.28 no.3
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    • pp.233-238
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    • 2004
  • Comer point is a very important information to a pattern recognition of image processing. And so, many researchers develope various detecting comer point algoritms. But, there are some problems to get comer points by 8 directional chain code when the degree of edge line is not integer multiplication of 45 degree. So, we propose a new algorithm which is combined with morphology and human visual conception for optimal comer points without the above defects. We get a good simulation result by this proposed algorithm Ana so, we think this algorithm is very useful to FA(factory automation} and ship's radar system to know some coastal area from its image.

An analysis of design for a branding strategy of online shopping mall for women in their 20s focusing on the main homepage (20대 여성복 온라인 쇼핑몰의 브랜드 전략을 위한 메인 홈페이지 디자인 분석)

  • Jeong, Hwa-Yeon
    • Journal of the Korea Fashion and Costume Design Association
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    • v.20 no.4
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    • pp.131-146
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    • 2018
  • In this study, five women's fashion shopping mall companies were selected as the subjects based on the number of searches per month for analyzing website design of online shopping mall for women in their twenties. Design characteristics are divided into three aspects such as structural, visual, and customer service, and the results are as follow. First, from the structural perspective, the main navigation area and global navigation area of most shopping malls are arranged at the top center, and below them, the main image, the banner area, and the content area are arranged in order. Looking at the visual aspect, the logo is mostly written in a black text, the colors used on the main page were only one or two colors such as pink-based, gray-based, and red. Finally, from the customer service aspect, most shopping malls were encouraging buyers to place celebrity sponsorship, videos using products, self made products, and best products in the banner area. The results of this study are to present the direction of design for the founders who intend to operate the women' fashion shopping mall in future, and provide basic data for online shopping mall design research.

A Difference Analysis on Visual Approach Accessibility of Airline Pilots Based on Flight Experience including Non-parametric Statistical Test (정기항공사 소속 조종사의 비행경력에 따른 시계접근능력 차이 분석 : 비모수 통계검정을 포함하여)

  • Lee, Gun-Young;Hwang, Jae-Kap;Jang, Ji-Seung
    • Journal of Advanced Navigation Technology
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    • v.23 no.2
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    • pp.104-113
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    • 2019
  • There are keen competitions among the air operators to recruit competent pilots, which could be adversely affect the safe operation of aircraft. This study is aimed to identify the correlation between the flight experience of the pilot of the air transport operator and competency on visual approach operation. About 2,400 sets of flight training data of several pilots of an air transport operator was analysed for this study. The analysis showed that most captains were able to make stabilized visual approach regardless of his/her flight experience of any type of aircraft, while the first officers were able to make a stabilized visual approach with more than 1,500 hours of flight experience for each rated type of aircraft. This should be considered during making policies for the supply and demand of pilots for the safe operation of air transport.

On the Implementation of Route Planning Algorithms on the Electronic Chart System (전자해도 상의 항해계획 알고리듬 구현에 관한 연구)

  • 위승민;김시화;장일동
    • Journal of the Korean Institute of Navigation
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    • v.24 no.3
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    • pp.167-176
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    • 2000
  • The -advent of electronic navigation equipment and trustworthy computer which provides people with convenience made the management system by one-man bridge operation or the least people who are needed possible through the integration of communication network with various navigation equipment and related institution. One of the most needed ultra-modem navigation device for a mate, ECDIS is a core equipment for navigation in ENS that notifies peril to mate as well as supervises all tasks in hydrographical chart, voyage planning, course monitoring and voyage recording. We should make coast and ocean voyage planning first, for the secure navigation which is considering the course circumstances and next, for the reduction of voyage dates in economical aspect. There needs a thoughtful consideration about the feature of the ship itself and the course with weather condition in taking up the course and also we have to take into accounts about appropriate distance between ships. Considering the essential conditions of ECDIS the indispensable device in the future, it was developed the basic principle for voyage planning algorithm for officer and programmed to real implementation available. In this paper including most of the requirements in ECDIS performance standard I mentioned about such a basic and a core Principle with real application by using the Visual C++ programming language. The voyage plan includes the function that indicate and modifies all the way points in the course from department port to arrival port with erasing the wrong way points. Also, it provides in a document form that shows ETA at glance in average speed sailing.

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Design of a loosely-coupled GPS/INS integration system (약결합 방식의 GPS/INS 통합시스템 설계)

  • 김종혁;문승욱;김세환;황동환;이상정;오문수;나성웅
    • Journal of the Korea Institute of Military Science and Technology
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    • v.2 no.2
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    • pp.186-196
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    • 1999
  • The CPS provides data with long-term stability independent of passed time and the INS provides high-rate data with short-term stability. By integrating these complementary systems, a highly accurate navigation system can be achieved. In this paper, a loosely-coupled GPS/INS integration system is designed. It is a simple structure and is easy to implement and preserves independent navigation capability of GPS and INS. The integration system consists of a NCU, an IMU, a GPS receiver, and a monitoring system. The navigation algorithm in the NCU is designed under the multi-tasking environment based on a real-time kernel system and the monitoring system is designed using the Visual C++. The integrated Kalman filter is designed as a feedback formed 15-state filter, in which the states are position errors, velocity errors, attitude errors and sensor bias errors. The van test result shows that the integrated system provides more accurate navigation solution then the inertial or the GPS-alone navigation system.

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Stereo Semi-direct Visual Odometry with Adaptive Motion Prior Weights of Lunar Exploration Rover (달 탐사 로버의 적응형 움직임 가중치에 따른 스테레오 준직접방식 비주얼 오도메트리)

  • Jung, Jae Hyung;Heo, Se Jong;Park, Chan Gook
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.6
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    • pp.479-486
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    • 2018
  • In order to ensure reliable navigation performance of a lunar exploration rover, navigation algorithms using additional sensors such as inertial measurement units and cameras are essential on lunar surface in the absence of a global navigation satellite system. Unprecedentedly, Visual Odometry (VO) using a stereo camera has been successfully implemented at the US Mars rovers. In this paper, we estimate the 6-DOF pose of the lunar exploration rover from gray images of a lunar-like terrains. The proposed algorithm estimates relative pose of consecutive images by sparse image alignment based semi-direct VO. In order to overcome vulnerability to non-linearity of direct VO, we add adaptive motion prior weights calculated from a linear function of the previous pose to the optimization cost function. The proposed algorithm is verified in lunar-like terrain dataset recorded by Toronto University reflecting the characteristics of the actual lunar environment.

Attentional Effects of Crossmodal Spatial Display using HRTF in Target Detection Tasks (항공 목표물 탐지과제 수행에서 머리전달함수(HRTF)를 이용한 이중감각적 공간 디스플레이의 주의효과)

  • Lee, Ju-Hwan
    • Journal of Advanced Navigation Technology
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    • v.14 no.4
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    • pp.571-577
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    • 2010
  • Driving aircraft requires extremely complicated and detailed information processing. Pilots perform their tasks by selecting the information relevant to them. In this processing, spatial information presented simultaneously through crossmodal link is advantageous over the one provided in singular sensory mode. In this paper, probability to apply providing visual spatial information along with auditory information to enemy tracking system in aircraft navigation is empirically investigated. The result shows that auditory spatial information, which is virtually created through HRTF is advantageous to visual spatial information alone in attention processing. The findings suggest auditory spatial information along with visual one can be presented through crossmodal link by utilizing stereophonic sound such as HRTF. which is available in the existing simple stereo system.