• 제목, 요약, 키워드: texture

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GLCM/GLDV 기반 Texture 알고리즘 구현과 고 해상도 영상분석 적용 (Implementation of GLCM/GLDV-based Texture Algorithm and Its Application to High Resolution Imagery Analysis)

  • 이기원;전소희;권병두
    • 대한원격탐사학회지
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    • v.21 no.2
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    • pp.121-133
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    • 2005
  • 화소들 사이의 관계를 고려해 Texture 영상을 생성해 내는 것을 의미하는 Texture 영상화는 유용한 영상 분석 방법 중의 하나로 잘 알려져 있고, 대부분의 상업적인 원격 탐사 소프트웨어들은 GLCM이라는 Texture 분석 기능을 제공하고 있다. 본 연구에서는, GLCM 알고리즘에 기반한 Texture 영상화 프로그램이 구현되었고, 추가적으로 GLDV에 기반을 둔 Texture 영상화 모듈 프로그램을 제공한다. 본 프로그램에서는 Homogeneity, Dissimilarity, Energy, Entropy, Angular Second Moment(ASM), Contrast 등과 같은 GLCN/GLDV의 6가지 Texture 변수에 따라 각각 이에 해당하는 Texture 영상들을 생성해 낸다. GLCM/GLDV Texture 영상 생성에서는 방향 의존성을 고려해야 하는데, 이 프로그램에서는 기본적으로 동-서, 북동-남서, 북-남, 북서-남동 등의 기본적인 방향설정을 제공한다. 또한 이 논문에서 새롭게 구현된 커널내의 모든 방향을 고려해서 평균값을 계산하는 Omni 방향 모드와 커널내의 중심 화소를 정하고_그 주변 화소에 대한 원형 방향을 고려하는 원형방향 모드를 지원한다. 또한 본 연구에서는 여러 가지 변수와 모드에 따라 얻어진 Texture 영상의 분석을 위하여 가상 영상 및 실제 위성 영상들에 의하여 생성된 Texture 영상간의 특징 분석과 상호상관 분석을 수행하였다. Texture 영상합성 응용시에는 영상의 생성시에 적용된 변수들에 대한 이해와 영상간의 상관도를 분석하는 과정이 필요할 것으로 생각된다.

알루미늄 판재의 온간압연 집합조직과 미세조직에 미치는 초기 집합조직의 영향 (Effect of Initial Texture on the Evolution of Warm Rolling Texture and Microstructure in Aluminum Alloy Sheet)

  • 김훈동;허무영
    • 한국소성가공학회:학술대회논문집
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    • pp.138-141
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    • 2001
  • The evolution of lectures and microstructure during the warm-rolling and subsequent annealing in aluminum 3004 alloy sheets was investigated by employing X-ray texture measurements and microstructure observations. Whereas the typical $\beta$-fiber orientations with the strong Bs-orientation $\{112\}<110>$ formed in the normally cold-rolled specimen, the warm-rolling at $250^{\circ}C$ led to the development of a strong through thickness texture gradient which was characterized by shear texture at the surface layer and rolling textures at the center layer After warm rolling, ultra-fine grains formed in the thickness layer with shear texture components. Upon recrystallization annealing, the $\{001\}<100>$ Cube-texture developed at the expense of normal rolling texture components the rise to the formation of corase recrystallized grains. However, in the layer with shear texture components the continuous recrystallization took place and the fine grain size persisted even after recrystallization annealing.

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투사정보를 이용한 구조적 텍스처의 분석 및 합성 (Analysis and Synthesis of Structural Textures Using Projection Information)

  • 김한빈;박래홍
    • 대한전자공학회논문지
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    • v.26 no.9
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    • pp.1428-1435
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    • 1989
  • In this paper we propose a new algorithm which extracts spatial arrangement information of texture elements in structural textures. In the proposed algorithm, by the use of projection information in several directions obtained from the texture image we can get two directions which determine the texture structure and the parallelogram grid which isolates texture elements. The isolated texture elements are analyzed and used to synthesize texture images. Computer simulation shows that the proposed method can extract proper spatial structure of the texture element even when the texture image is highly corrupted by additive noise.

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Texture 영상 분할을 위한 고속 적응 특징 추출 방법 (A Fast and Adaptive Feature Extraction Method for Textured Image Segmentation)

  • 이정환;김성대
    • 한국통신학회논문지
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    • v.16 no.12
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    • pp.1249-1265
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    • 1991
  • 본 논문에서는 texture 영상 분할을 위한 새로운 고속 적응 texture 특징 추출 방법을 제안하였다. 먼저 기존의 통계적 texture 특징 추출 방법에 대하여 설명하였으며, SGLDM을 구하는 방법과 이것을 이용하여 추출할 수 있는 textrue 특징들에 관하여 기술하였다. 그리고 고속으로 특징을 추출하기 위한 반복 계산식을 각 특징에 대하여 유도하였으며 반복 계산식으로 이용하여 고속 적응 texture 특징을 방법에 대하여 설명하였다. 마지막으로 제안된 방법의 성능을 평가하기 위하여 인공적으로 합성한 texture 영상에 대하여 컴퓨터 시뮬레이션을 수행하였다. 그 결과 기존의 방법과 비교해서 영역의 경계부분에서 비교적 정확한 특징값을 추출할 수 있음을 알 수 있었다.

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Texture superpixels merging by color-texture histograms for color image segmentation

  • Sima, Haifeng;Guo, Ping
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.8 no.7
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    • pp.2400-2419
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    • 2014
  • Pre-segmented pixels can reduce the difficulty of segmentation and promote the segmentation performance. This paper proposes a novel segmentation method based on merging texture superpixels by computing inner similarity. Firstly, we design a set of Gabor filters to compute the amplitude responses of original image and compute the texture map by a salience model. Secondly, we employ the simple clustering to extract superpixles by affinity of color, coordinates and texture map. Then, we design a normalized histograms descriptor for superpixels integrated color and texture information of inner pixels. To obtain the final segmentation result, all adjacent superpixels are merged by the homogeneity comparison of normalized color-texture features until the stop criteria is satisfied. The experiments are conducted on natural scene images and synthesis texture images demonstrate that the proposed segmentation algorithm can achieve ideal segmentation on complex texture regions.

도금층의 재결정 집합조직에 관한 연구 (A Study on the Recrystallization Texture of Electrodeposits)

  • 홍상철
    • 한국소성가공학회:학술대회논문집
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    • pp.184-187
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    • 1999
  • The texture of electrodeposits is related to microstructure surface morphology and mechanical properties. When the electrodeposits annealed the recrystallization texture many be different from the original deposition texture. the <100> and <110> textures of nickel electrodeposits changed to the <100> and <{{{{ SQRT {310 } }}}}> textures when recrystallized The <100> and <{{{{ SQRT {310 } }}}}> mixed texture is changed to the <100> texture. The <002> texture of Zn electrodeposits didn't changed even after recrystallization.

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구조적 특성을 갖는 Texture 영상의 해석 (The Analysis of Texture Images with Structural Characteristics)

  • 갑재섭;박래홍
    • 대한전자공학회논문지
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    • v.24 no.4
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    • pp.675-683
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    • 1987
  • In general, texture images with regular patterns can be described by using the standard texture model regularity vectors for their shape analysis. Early methods not only take much time but also have computational complexity in obtaining regularity vectors. The proposed some improved preprocessing algorithms for texture analysis. Finally, we showed the utility of the proposed method through texture synthesis by making use of the results of texture analysis.

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비대칭 압연한 강판의 GOSS 방위 발달에 미치는 초기 집합조직의 영향 (Effect of Initial Texture on the Development of Goss Orientation of Asymmetrically Rolled Steel Sheets)

  • 이철우;정효태;이동녕;김인수
    • 소성가공
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    • v.29 no.1
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    • pp.27-36
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    • 2020
  • The Goss texture component of {110}<001> is well known as one of the best texture components to improve the magnetic properties of electrical steel sheets. The small amount of the Goss texture component is obtained at the surface of the steel sheet by shear deformation due to friction between the steel sheet and the roll during conventional symmetric rolling. This study aims to identify a method to obtain high intensity of the Goss texture component not only at the surface but in the whole layer of the steel sheet by shear deformation of asymmetric rolling. Low carbon steel sheets, which have different initial texture, were asymmetrically rolled by about 50%, 70%, and 80%. The pole figures of the top, center, and bottom layers of the initial and asymmetrically rolled low carbon steel sheets were measured by an X-ray diffractometer. Based on the measured pole figures of these samples, the intensities of the main texture components were analyzed for the initial and asymmetrically rolled low carbon steel sheets. As a result, the initial low carbon steel sheet with the γ-fiber component showed a higher intensity of the Goss texture component in the whole layer than the steel sheet with other texture components after asymmetric rolling.

AI 5182 합금 판재의 회전압연 집합조직과 미세조직 (Clock Rolling texture and Microstructure in AA5182)

  • 마종완;이강노;김훈동;허무영
    • 한국소성가공학회:학술대회논문집
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    • pp.147-149
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    • 2001
  • In order to understand the influence of the modification of deformation texture on the formation of annealing texture, the evolution of texture during the clock rolling and the subsequent annealing was investigated by employing X-ray texture measurements and microstructure observation. The $\beta$-fiber orientations were proved to be quite unstable during the clock rolling. The clock rolled texture having uniform orientation densities along $\{011\}//ND$ fiber resulted in the randomization of annealing texture. This indicated that the operation of both the oriented nucleation and the oriented growth was effectively suppressed in the clock-rolled specimen during recrystallization.

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$90\%$ 단면감소율로 인발된 전해동의 어닐링시 집합조직과 미세조직 발달에 미치는 전단 변형의 영향 (Effects of Shear Strains on the Developement of Texture and Microstructure of $90\%$ Drawn Copper Wire during Annealing)

  • 박현;이동녕
    • 한국소성가공학회:학술대회논문집
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    • pp.55-62
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    • 2001
  • An electrolytic copper rod was drawn up to $90\%$ in area reduction and annealed under various conditions. The EBSD measurement of the drawn wire showed that in the center region the <111> + <100> fiber duplex texture was dominant, while in the middle and surface regions relatively defused textures developed with a little higher density in <11w>//wire axis. The inhomogeneous texture in the deformed wire gave rise to the inhomogeneous microstructure and texture after annealing. The annealing texture could be classified into the recrystallization texture developed during low temperatures and at the early stage at a high temperature and the growth texture developed after a prolonged annealing at the high temperature. The recrystallization temperature could be explained by the strain energy release maximization model and the growth texture was discussed based on the grain boundary mobility anisotropy.

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