• Title/Summary/Keyword: Edge Direction

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Deinterlacing Method Based on Edge Direction Refinement Using Weighted Median Filter (가중중앙값 필터를 이용한 에지 방향성 보정 기반 디인터레이싱 기법)

  • Jang, Seung-Min;Kim, Young-Chul;Hong, Sung-Hoon
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.46 no.4
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    • pp.89-96
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    • 2009
  • In this paper, we propose an efficient deinterlacing algorithm which is an edge dependent interpolation based on edge direction refinement. The conventional edge dependent interpolation algorithms have a visually better performance than any other Intra-field deinterlacing algorithms. However they are very sensitive to noise due to the failure of estimating edge direction. In order to exactly detect edge direction, our method detects edge direction of around interpolated pixel and refines the edge direction using weighted median filter. Simulation results have shown the efficacy of the proposed method with significant improvement over the previous methods in terms of the objective PSNR quality as well as the subjective image quality.

Study on Deformation Characteristics of Hole Expansion Test and Its Applicability (구멍확장시험의 변형특성 및 활용성 연구)

  • Han, S.S.;Lee, H.Y.
    • Transactions of Materials Processing
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    • v.28 no.3
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    • pp.154-158
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    • 2019
  • The hole expansion tests using conical punch, flat punch or hemispherical punch are widely used for stretch flangeability verification of HSS. In this study, we investigate the strain distribution on the shear edges of the hole expansion test using grid marking and a projector. A small crack at the edge is distributed, resulting in a large gap between the HER and the crack strain. The strain distribution at the edges is irregular due to anisotropy of sheet metal. While an edge perpendicular to the rolling direction indicate a lower strain level compared to an edge parallel to the rolling direction, edge cracks occur at the edge perpendicular to the rolling direction. To predict the manifestation of edge cracks in FE analysis, the result of the hole expansion test with a crack strain measurement may well be a better tool than FLD. In this case, the level of strain and the direction of the edge relative to the rolling direction should be well considered.

A Single Field Deinterlacing Algorithm Using Edge Map in the Image Block (영상 블록에서의 에지 맵을 이용한 단일 필드 디인터레이싱 알고리듬)

  • Kang, Kun-Hwa;Jeon, Gwang-Gil;Jeong, Je-Chang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.4C
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    • pp.355-362
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    • 2009
  • A new intra field deinterlacing algorithm with edge map in the image block is introduced. Conventional deinterlacing methods usually employ edge-based line average algorithm within pixel-by-pixel approach. However, it is sensitive to variation of intensity. To reduce this shortcoming, we proposed edge direction vector computed by edge map, and also its interpolation technique. We first introduce an edge direction vector, which is computed by Sobel mask, so that finer resolution of the edge direction can be acquired. The proposed edge direction vector oriented deinterlacer operates by identifying small pixel variations in five orientations, while weighted averaging to estimate missing pixel. According to the edge direction of the direction vector, we calculate weights on each edge direction. These weight values multiplied by the candidate deinterlaced pixels in order to successively build approximations of the deinterlaced sequence.

An Adaptive Image Restoration Algorithm Using Edge Detection Based on the Block FFT (블록 FFT에 기초한 에지검출을 이용한 적응적 영상복원 알고리즘)

  • Ahn, Do-Rang;Lee, Dong-Wook
    • Proceedings of the KIEE Conference
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    • 1998.11b
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    • pp.569-571
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    • 1998
  • In this paper, we propose a method of restoring blurred images by an edge-sensitive adaptive filter. The direction of the edge is estimated using the properties of 2-D block FFT. Reduction of blurring due to the added noise during image transfer and the focus of lens caused by shooting a fast moving object is very important. To remove this phenomenon effectively, we can use the edge information obtained by processing the blurred images. The proposed algorithm estimates both the existence and the direction of the edge. On the basis of the acquired edge direction information, we choose the appropriate edge-sensitive adaptive filter, which enables us to get better images than images obtained by methods not considering the direction of the edge. The performance of the proposed algorithm is shown in the simulation result.

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Edge Detection by Compass Gradient Masks (컴패스 그라디언트 매스크에 의한 에지 검출)

  • 김영채;김명기
    • Proceedings of the Korean Institute of Communication Sciences Conference
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    • 1986.10a
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    • pp.53-55
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    • 1986
  • The edge detection system makes use or 3*3 compass gradient masks, which are well suited for digital implementation. Edge angles are quantized to eight equally spaced directions, suitable for chain coding of contours. Use of edge direction msp improves the simple thresholding of gradient modulus image. The concept of local connectivity of the edge direction map is useful improving the performance of this method as well as other edge operators such as Kirsch and Sobel.

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A Camber Monitoring System of RM Zone based on Direction Selective Edge Detection Algorithm (방향 선택형 에지검출 알고리즘 기반의 RM존 캠버 모니터링 시스템)

  • Kim, Hyun-Soo;Choi, Yong Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.8
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    • pp.713-717
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    • 2015
  • In this paper, we propose camber monitoring system which is using on hot rolling process. In roughing mill which is one of the rolling part in hot rolling process, steel plate can be bended in width direction under the imbalance of rolling condition. This bending of steel plate in width direction is called as camber. In order to measure the camber, first, cameras which are installed over transport pathway of steel plate take pictures of whole shape of steel plate. And location value of steel plate edge is extrated from these pictures by edge detection algorithm. But, there are a lot of noises which are generated by such as water sprays, dusts, peripheral equipments in these pictures, and these noises make edge detection difficult. In order to solve this kind of problem, we developed a direction selective edge detection algorithm, and applicated in our camber monitoring system. As a result, we got stable results in spite of process noises.

Pixel value prediction algorithm using three directional edge characteristics and similarity between neighboring pixels

  • Jung, Soo-Mok
    • International Journal of Internet, Broadcasting and Communication
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    • v.10 no.1
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    • pp.61-64
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    • 2018
  • In this paper, a pixel value prediction algorithm using edge components in three directions is proposed. There are various directional edges and similarity between adjacent pixels in natural images. After detecting the edge components in the x-axis direction, the y-axis direction, and the diagonal axis direction, the pixel value is predicted by applying the detected edge components and similarity between neighboring pixels. In particular, the predicted pixel value is calculated according to the intensity of the edge component in the diagonal axis direction. Experimental results show that the proposed algorithm can effectively predict pixel values. The proposed algorithm can be used for applications such as reversible data hiding, reversible watermarking to increase the number of embedded data.

Edge-Directed Color Interpolation on Disjointed Color Filter Array (분리된 컬러 필터 배열을 이용한 에지 방향 컬러 보간 방법)

  • Oh, Hyun-Mook;Yoo, Du-Sic;Kang, Moon-Gi
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.47 no.1
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    • pp.53-61
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    • 2010
  • In this paper, we present a color interpolation algorithm that uses novel edge direction estimator and region classifier. The proposed edge direction estimator accurately determines the edge direction based on the correlation between the images obtained by the channel separated and down-sampled Bayer color filter array(CFA) pattern. The correlation is defined based on the similarity between the edge direction in the local region of the image and the shifting direction of the images. Also, the region of an image is defined as the flat, the edge, and the pattern-edge regions, where the edges are appeared repeatedly. When all the pixels in the image are classified into the three different regions, each pixel is interpolated horizontally or vertically according to the estimated direction. Experimental results show that the proposed algorithm outperforms the conventional edge-directed methods on objective and subjective criteria.

A Deinterlacing Method Based on the Edge Direction Vectors (에지 방향 벡터 기반 디인터레이싱 기법)

  • Lee, Kwang-Bo;Park, Sung-Han
    • 전자공학회논문지 IE
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    • v.45 no.4
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    • pp.47-53
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    • 2008
  • A new intra-field deinterlacing algorithm with edge direction vector (EDV) in the image block is introduced. This proposed filter is suitable to the region with high motion or scene change. We first introduce an EDV, which is computed by Sobel mask used edge map, so that filer resolution of the edge direction can be acquired. The proposed EDV oriented deinterlacing system operates by identifying small pixel variations in five orientations, $26.5^{\circ}$, $45^{\circ}$, $90^{\circ}$, $135^{\circ}$, and $153.5^{\circ}$. The EDV values work as inputs of Sobel mask and return edge direction degree and confidence parameters. Based on edge direction degree and confidence parameters the missing pixel is computed. The results of computer simulations demonstrate that the proposed method outperforms a number of intra-field deinterlacing methods in the literature.

Novel De-interlacing Algorithm Using All Direction Edges Estimation Technique (전 방향 에지 예측 기법을 이용한 De-interlacing 알고리듬)

  • Ku, Su-Il;Lee, Se-Young;Kang, Kun-Hwa;Jeong, Je-Chang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.9C
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    • pp.725-733
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    • 2008
  • This paper proposed a novel do-interlacing algorithm using all direction edges estimation technique. In the proposed algorithm. previously developed the DOI(Direction-Oriented Interpolation) algorithm was used as a basis. The do-interlacing method was divided into two main parts. First, we should estimate edge direction. Then, missing pixel: were interpolated along with the decided edge. In this paper, after estimating the edge through the DOI algorithm considering high angle edge direction, missing pixels were interpolated by using the median filter. Experimental results indicate that the proposed algorithm is superior to the conventional algorithms in terms of the objective and subjective criteria.