• 제목/요약/키워드: Horizontal Edge

검색결과 295건 처리시간 0.021초

미약한 시각 특징과 Haar 유사 특징들의 강화 연결에 의한 도로 상의 실 시간 차량 검출 (Real Time On-Road Vehicle Detection with Low-Level Visual Features and Boosted Cascade of Haar-Like Features)

  • 샴 아디카리;유현중;김형석
    • 제어로봇시스템학회논문지
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    • 제17권1호
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    • pp.17-21
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    • 2011
  • This paper presents a real- time detection of on-road succeeding vehicles based on low level edge features and a boosted cascade of Haar-like features. At first, the candidate vehicle location in an image is found by low level horizontal edge and symmetry characteristic of vehicle. Then a boosted cascade of the Haar-like features is applied to the initial hypothesized vehicle location to extract the refined vehicle location. The initial hypothesis generation using simple edge features speeds up the whole detection process and the application of a trained cascade on the hypothesized location increases the accuracy of the detection process. Experimental results on real world road scenario with processing speed of up to 27 frames per second for $720{\times}480$ pixel images are presented.

ADI 보간 알고리듬을 적용한 Color Space Converter 칩 설계에 관한 연구 (A study of the color De-interlacing ASIC Chip design adopted the improved interpolation Algorithm for improving the picture quality using color space converter.)

  • 이치우;박노경;진현준;박상봉
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(4)
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    • pp.199-202
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    • 2001
  • A current TV-OUT format is quite different from that of HDTY or PC monitor in encoding techniques. In other words, a conventional analog TV uses interlaced display while HDTV or PC monitor uses Non-interlaced / Progressive-scanned display. In order to encode image signals coming from devices that takes interlaced display format for progressive scanned display, a hardware logic in which scanning and interpolation algorithms are implemented is necessary. The ELA (Edge-Based Line Average) algorithm have been widely used because it provided good characteristics. In this study, the ADI(Adaptive De-interlacing Interpolation) algorithm using to improve the algorithm which shows low quality in vertical edge detections and low efficiency of horizontal edge lines. With the De-interlacing ASIC chip that converts the interlaced Digital YUV to De-interlaced Digital RGB is designed. The VHDL is used for chip design.

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디지탈 이미지프로세싱을 이용한 자동외관검사장치 개발 (System Development for Automatic Form Inspecion by Digital Image Processing)

  • 유봉환
    • 한국생산제조학회지
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    • 제5권2호
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    • pp.57-62
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    • 1996
  • Basically, the idea underlying most edge-detection technique is the computation of a local derivative operator used for edge detection in gray level image. This concept can be easily illustrated with the aid of object which shows an image of a simple lilght on a dark background, Using the gray level profile along a horizontal scan line of the image. the first and second derivatives of it were acquired. This study is to develop an automatic measuring system based on the digital image processing which can be applied to the real time measurement of the characteristics of the ultra-thin thickness. The experimental results indicate that the developed automatic inspection can be applied in real situation.

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실시간 영상 분석에 의한 이동 물체 추적 (Moving Object Tracking by Real Time Image Analysis)

  • 구상훈;이은주
    • 한국산업정보학회:학술대회논문집
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    • 한국산업정보학회 2003년도 추계공동학술대회
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    • pp.145-156
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    • 2003
  • This paper for real time object tracking in this treatise detect histogram analysis that is accumulation value of binary conversion density and edge information and body that move by real time use of difference Image techniques and proposed method to object tracking. Firstly, we extract edge that can reduce quantity of data keeping information about form of input image in object detection. Object is extracted by performing difference image and binarization in edge image. Area of detected object is determined by threshold value that divide sum of horizontal accumulation value about binary conversion density by value that add horizontalityㆍverticality maximum accumulation value. Object is tracked by comparing similarity with object that is detected in previous frame and present frame. As experiment result, proposed algorithm could improve the object detection speed, and could track object by real time and could track local movement.

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차원 해석을 이용한 수직압연에 대한 도그본 형상 예측 (Dimensional Analysis of Edge Rolling for the Prediction of the Dog-bone Shape)

  • 윤덕중;황상무
    • 소성∙가공
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    • 제21권1호
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    • pp.24-29
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    • 2012
  • Precision control of the width of slabs is vital for product quality and production economy in steel rolling mills. However, the formation of so called 'dog-bone' at the edge of the slab would affect the final width during the horizontal rolling that follows. Therefore, it is essential to predict and control the dog-bone shape. In this paper, a model is derived by using a number of finite element simulations for edge rolling and a least square regression analysis. The prediction accuracy of the proposed model is examined by comparing the predictions from finite element simulation with experiment results in the literature.

전투기 형상의 외부 장착물과 꼬리 날개 공력 간섭에 대한 수치적 연구 (NUMERICAL SIMULATION OF THE INTERFERENCE EFFECT OF EXTERNAL STORES AND TAIL WING SURFACES OF A GENERIC FIGHTER AIRCRAFT)

  • 김민재;권오준;김지홍
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2007년도 추계 학술대회논문집
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    • pp.149-156
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    • 2007
  • A three-dimensional inviscid flow solver has been developed based on unstructured meshes for the simulation of steady and unsteady flowfields around a generic fighter aircraft and for the investigation of the aerodynamic interference between the external stores and the tail surfaces. The flow solver is based on a vertex-centered finite-volume method and an implicit point Gauss-Seidel relaxation scheme. To validate the flow solver, calculations were made for a steady flow and the computed results were compared with experimental data. An unsteady time-accurate computation of the generic fighter aircraft with external stores at transonic flight conditions showed that the external stores cause undesirable vibration on the horizontal tail surface due to the mutual interference between their wake and the horizontal tail surface. It was shown that downward deflection of the trailing edge flap significantly reduces the undesirable interference effect.

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열간압연시 폭퍼짐 보상을 통한 폭정밀도 개선연구 (Precise width control through the width spread compensation in hot strip mill)

  • 천명식;이준정;문영훈
    • 소성∙가공
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    • 제8권2호
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    • pp.200-207
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    • 1999
  • To increase dimensional accuracy of strip width, model to compensate width spread during roughing mill has been developed. To measure the amount of width spread during the production rolling more precisely, special roughing rolling procedures for the horizontal rolling and dog-bone rolling were designed in the actual production mill. From the operational data analysis, it is known that the prime factors influencing on the width spread were strip width, strip thickness, edging amount, number of pass and type of edger roll etc., Based upon the statistical analysis of rolling data, new models which can predict width spread during horizontal rolling and dog-bone rolling were developed and tested on the actual processing conditions for the reliability. The application test showed that newly developed model gave fairly accurate predictions on the width spread during roughing passes.

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Study on fracture mechanics of granite specimens with different precast notch depths based on DIC method

  • Shuwen Cao;Hao Shu
    • Geomechanics and Engineering
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    • 제33권4호
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    • pp.393-400
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    • 2023
  • Displacements near crack and stress intensity factor (SIF) are key parameters to solve rock failure issue when using fracture mechanics. In order to study the horizontal displacement and stress intensity factor of the mode I fracture, a series of three-point bending tests of granite specimens with central notch were carried out. The evolution of horizontal displacements of precast notch and crack tip opening displacements (CTOD) were analyzed based on the digital image correlation (DIC) method. Stress intensity factors for three-point bending beams with arbitrary span-to-width ratios(S/W) were calculated by using the WU-Carlsson analytical weight function for edge-crack finite width plate and the analytical solution of un-cracked stress by Filon. The present study provides a high efficient and accurate method for fracture mechanics analysis of the three-point bending granite beams.

공간주파수를 이용한 장면영상에서 텍스트 검출 (Text Detection in Scene Images using spatial frequency)

  • Sin, Bong-Kee;Kim, Seon-Kyu
    • 한국정보과학회논문지:소프트웨어및응용
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    • 제30권1_2호
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    • pp.31-39
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    • 2003
  • 장면 영상 속의 분사 영역에는 다른 부분과는 구분되는 특징적인 공간주파수가 있다. 이 특징은 직관적이며 또한 유용한 정보로서의 가치가 있다. 본 논문에서는 장면 영상에서 수평 텍스트를 찾는 방법을 제안한다. 수직 및 수평 방향으로 걸친 edge 픽셀의 빈도수와 푸리에 변환에 의한 기본 주파수의 두 가지 특징을 이용한 방법이다. 두 가지 특징을 독립적으로 활용하여 그 결과를 결합하거나 연속하여 적용하여 원하는 결과를 얻을 수 있다. 이와 같은 특징은 대체로 언어 또는 문자에 무관함을 확인하였다. 이에 추가하여 Hough 변환을 이용한 장면 속의 사각형을 탐색하였다. 여러 사람들에게 유용한 정보는 보통 강한 색상대비로 눈에 잘 띄는 색깔의 사각형 안에 씌어있는 경우가 보통이므로 사자형의 탐색함으로써 보다 효과적으로 문자를 탐색할 수 있다.

스테레오 방식에서 일치성 문제를 해결하기 위한 새로운 선소 정합법 (A New line Matching Technique for Solving Correspondence Problem in Stereo Method)

  • 강대갑;권중장;김성대
    • 대한전자공학회논문지
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    • 제27권3호
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    • pp.116-123
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    • 1990
  • 3D computer vision에서 일치성 문제를 해결하기 위한 많은 논문이 epipolar line이 수평하다는 가정을 사용한다. 그러나 실제로 그러한 상황을 만들기에는 어려운 점이 있다. 본 논문은 epipolar line이 수평하지 않은 상태에서 적용할 수 있으며 line matching에 근거를 둔 binocular-stereo matching 알고리듬을 제안한다. 본 논문의 방법은 주어진 line segment 의 끝점에서의 epipolar line 들과 그점에서 maximum disparity에 의해서 결정되어지는 line searching window를 사용한다. 정합시에는 line segment들의 방향과 edge의 세기, cross-correlation들을 사용하였으며. 실험에 의해서 일치성 문제를 해결하기 위한 유용한 방법임을 알 수 있었다.

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