• Title, Summary, Keyword: texture

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The Characteristics of Frictional Behavior, Wear and Corrosion Resistance of Textured TiN Coated Layer (TiN 코팅층 집합조직의 변화에 따른 마찰, 마멸과 내부식 특성)

  • 김희동;김인수;성동영;이민구
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.99-104
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    • 2003
  • TiN coated films show a good mechanical properties, high thermal properties and wear, erosion and corrosion resistance and are widely used as a coating materials in tools, ornaments, parts and semiconductors. In spite of these good properties, the fracture of TiN coated films occur during use. The fracture of TiN thin films is related to their microstructure. Especially, the life of TiN coated layer is related to the texture of the TiN films. One researcher suggested that the corrosion and erosion resistance of the TiN thin films is related to a uniform and dense structure of films. In this study, we studied the relationships between textures and friction coefficient, erosion and corrosion in TiN coated films. The flatness of (115) texture surface of TiN thin films is flatter than that of (111) texture surface. The friction coefficient of (115) texture surface of TiN thin films is similar with that of (111) texture surface. The wear resistance of (115) texture surface of TiN thin films is better than that of (111) texture surface. The erosion and corrosion resistance of (115) texture surface of TiN thin films is better than that of (111) torture surface. As well as texture, the wear, erosion and corrosion of TiN thin films has to consider defects such as pinholes, cracks, surface roughness and open columnar structure. The life of TiN coated products is influenced by the properties of wear, erosion, and corrosion resistance of TiN thin films and is related to texture of TiN coated films, density of pinholes and cracks, density of structure, and surface flatness.

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A High Image Compression for Computer Storage and Communication

  • Jang, Jong-Whan
    • The Journal of Natural Sciences
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    • v.4
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    • pp.191-220
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    • 1991
  • A new texture segmentation-based image coding technique which performs segmentation based on roughness of textural regions and properties of the human visual system (HVS) is presented. This method solves the problems of a segmentation-based image coding technique with constant segments by proposing a methodology for segmenting an image texturally homogeneous regions with respect to the degree of roughness as perceived by the HVS. The fractal dimension is used to measure the roughness of the textural regions. The segmentation is accomplished by thresholding the fractal dimension so that textural regions are classified into three texture classes; perceived constant intensity, smooth texture, and rough texture. An image coding system with high compression and good image quality is achieved by developing an efficient coding technique for each segment boundary and each texture class. For the boundaries, a binary image representing all the boundaries is created. For regions belonging to perceived constant intensity, only the mean intensity values need to be transmitted. The smooth and rough texture regions are modeled first using polynomial functions, so only the coefficients characterizing the polynomial functions need to be transmitted. The bounda-ries, the means and the polynomial functions are then each encoded using an errorless coding scheme. Good quality reconstructed images are obtained with about 0.08 to 0.3 bit per pixel for three different types of imagery ; a head and shoulder image with little texture variation, a complex image with many edges, and a natural outdoor image with highly textured areas.

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Effect of Characteristics and Texture of Sight and Touch on the Tactile Preferences for the Black Fabrics (블랙 패션 소재의 특성과 시촉각적 질감이 촉감 선호도에 미치는 영향)

  • Kim, Yeo-Won;Choi, Jong-Myoung
    • The Research Journal of the Costume Culture
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    • v.19 no.3
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    • pp.556-564
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    • 2011
  • The purpose of this study was to analyze the effect of the structural properties, the color characteristics and the texture of sight and touch on the tactile preferences for the black fabrics. Male and female university students were asked to evaluate the texture of sight and touch and tactile preference to the nine different black fabrics which were selected on the basis of the previous research results. Data were analyzed by using frequency analysis, mean, factor analysis, t-test, F-test, correlation and regression analysis. The texture of sight and touch for black fabrics was classified into four factors: smoothness, bulkiness, extensibility, firmness. This texture of sight and touch factors showed a significant correlative relationship to the structural properties and color characteristics of the black fabrics. There were significant differences according to black fabrics on the point of texture of sight and touch. The velvet was evaluated the most smooth fabric, while the velvet and fake leather were evaluated the most bulky fabrics. Also, the jersey and lace fabrics were evaluated the most extensible fabrics, while the melton was evaluated as the most firm fabrics. There were significant correlative relationships not only between the structural properties and the texture of sight and touch but also between the color characteristics and the texture for black fabrics. Also, among the structural properties, the color characteristics and the texture of sight and touch of black fabrics, major variable factor of influencing on the tactile preference was turned out to be the texture of sight and touch.

Coordinate Determination for Texture Mapping using Camera Calibration Method (카메라 보정을 이용한 텍스쳐 좌표 결정에 관한 연구)

  • Jeong K. W.;Lee Y.Y.;Ha S.;Park S.H.;Kim J. J.
    • Korean Journal of Computational Design and Engineering
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    • v.9 no.4
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    • pp.397-405
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    • 2004
  • Texture mapping is the process of covering 3D models with texture images in order to increase the visual realism of the models. For proper mapping the coordinates of texture images need to coincide with those of the 3D models. When projective images from the camera are used as texture images, the texture image coordinates are defined by a camera calibration method. The texture image coordinates are determined by the relation between the coordinate systems of the camera image and the 3D object. With the projective camera images, the distortion effect caused by the camera lenses should be compensated in order to get accurate texture coordinates. The distortion effect problem has been dealt with iterative methods, where the camera calibration coefficients are computed first without considering the distortion effect and then modified properly. The methods not only cause to change the position of the camera perspective line in the image plane, but also require more control points. In this paper, a new iterative method is suggested for reducing the error by fixing the principal points in the image plane. The method considers the image distortion effect independently and fixes the values of correction coefficients, with which the distortion coefficients can be computed with fewer control points. It is shown that the camera distortion effects are compensated with fewer numbers of control points than the previous methods and the projective texture mapping results in more realistic image.

Simulation of Texture Evolution in DP steels during Deep Drawing Process (DP강의 디프드로잉 시 집합조직 발달 시뮬레이션)

  • Song, Y.S.;Han, S.H.;Chin, K.G.;Choi, S.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.130-133
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    • 2008
  • The formability of DP steels can be affected by not only initial texture but also deformation texture evolved during plastic deformation. To investigate the evolution of deformation texture during deep drawing, deep drawing process for DP steels was carried out experimentally. A rate sensitive polycrystal model was used to predict texture evolution during deep drawing process. In order to evaluate the strain path during deep drawing, a steady state was assumed in the flange part of deep drawn cup. A rate sensitive polycrystal model successfully predicted the texture development in DP steels during deep drawing process. It was found that the final stable orientations were strongly dependent on the initial location in the blank.

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A Synthetic Method for Generating Texture Patterns Similar to a Selected Original Texture Image

  • Shinji, Ohyama;Hong, Keum-Shik
    • 제어로봇시스템학회:학술대회논문집
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    • pp.35.5-35
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    • 2001
  • The purpose of the study is to develop a synthetic method for generating arbitrary number of not the same but similar texture images. The method includes processes to extract basic shape elements from texture images originating in actual objects, to select them to reappear the image features and to arrange them in a image plane. The authors have already proposed the shape-pass type filter bank assuming that the sensual impression mainly depends on minute shapes existing in the texture images. By use of nine basic shape elements, namely black/white-roof, black/white-line, black/white-snake, black/white-pepper, and cliff, natural texture images originating in actual objects have been characterized by feature vectors in a nine dimensional space. To generate arbitrary number of similar texture images, minute shape pieces ...

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Texture synthesis for model-based coding

  • Sohn, Young-Wook;Kim, In-Kwon;Park, Rae-Hong
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.23-28
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    • 1996
  • Model-based coding is one of several approaches to very low bit rate image coding and it can be used in many applications such as image creation and virtual reality. However, its analysis and synthesis processes remain difficult, especially in the sense that the resulting synthesized image reveals some degradation in detailed facial components such as furrows around eyes and mouth. To solve the problem, a large number of methods have been proposed and the texture update method is one of them. In this paper, we investigate texture synthesis for model-based coding. In the update process of the proposed texture synthesis algorithm, texture information is stored in a memory and the decoder reuses it. With this method, the transmission bit rate for texture data can be reduced compared with the conventional method updating texture periodically.

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Circular Texture of Drawn High-Carbon Steel Wire for Tire Cord (타이어 코드용 고탄소강선의 원형집합조직)

  • 엄경근;안종규;정효태;이동녕
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.194-197
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    • 1997
  • The texture of a 0.25mm dia high-carbon(0.73%) steel wire made by drawing the patented and brass coated 1.4mm wire through 22 dies with a die-angle of 12$^{\circ}$has been measured. The ideal fiber texture was obtained in the center layer, while the circular texture and the near fiber texture having {111}<110> and weak {112}<110> components were obtained in the intermediate and surface layers, respectively. The circular texture was approximated by {110}<110> plus {110}<114>. The texture could be predicted by the Taylor-Bishop-Hill theory coupled with FEM for deformation.

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The Influence of Cross Rolling on the texture of Aluminium 5182 Alloy (알루미늄 5182 합금에서 집합조직에 미치는 교차압연의 영향)

  • 김용희;조용상;허무영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.233-239
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    • 1997
  • The effect of the cross-rolling on the evolution of the deformation texture and the subsequent annealing texture was studied in 5182 aluminium alloy. The orientation density near {011}<110>. The weak ${\beta}$-fiber orientations in the deformation texture lead to the randomization of the annealing texture, whereas the strong ${\beta}$-fiber orientations lead to the strong Cube orientation in the annealing texture. The development of the strong rotated Cube orientation in the annealing texture seemed to be related with the decrease in the R-value.

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An Image Synthesis Technique Based on the Pyramidal Structure and MAP Estimation Technique (계층적 Pyramid구조와 MAP 추정 기법을 이용한 Texture 영상 합성 기법)

  • 정석윤;이상욱
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.8
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    • pp.1238-1246
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    • 1989
  • In this paper, a texture synthesis technique based on the NCAR(non-causal auto-regressive) model and the pyramid structure is proposed. In order to estimate the NCAR model parameters accurately from a noisy texture, the MAP(maximum a posteriori) estimation technique is also employed. In our approach, since the input texture is decomposed into the Laplacian oyramid planes first and then the NCAR model is applied to each plane, we are able to obtain a good synthesized texture even if the texture exhibits some non-random local structure or non-homogenity. The usrfulness of the proposed method is demonstrated with seveal real textures in the Brodatz album. Finally, the 2-dimensional MAP estimation technique can be used to the image restoration for noisy images as well as a texture image synthesis.

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