• 제목/요약/키워드: texture modified

검색결과 151건 처리시간 0.03초

변형된 경제 블록 병합 기법을 이용한 MPEG-4의 텍스처 부호화 (Texture Coding in MPEG-4 Using Modified Boundary Block Merging Technique)

  • 김두석;고형화
    • 한국통신학회논문지
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    • 제25권4B호
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    • pp.725-733
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    • 2000
  • 본 논문에서는 MPEG-4의 텍스처 부호화시 변형된 경계 블록 병합 기법을 제안하였다. 경계 블록 병합 기법의 전처리 과정으로 VOP를 나누는 위치를 조절하여 병합 시 부호화해야 할 블록의 수가 최소가 되는 점을 찾아 이를 기준으로 VOP를 다시 분할하는 최적화된 영역 분할 방법을 제안하였다. 또한, 객체의 모양이 복잡한 경우에는 +90。 회전과 -90。 회전 병합을 추가함으로써 병합의 가능성을 높일 수 있다. 따라서 본 논문에서는 180。 회전 병합, +90。 회전 병합 그리고 -90。 회전 병합의 순서로 병합을 하는 다중 회전 병합을 제안하였다. 기존의 경계 블록 병합 기법에서는 병합이 되는 두 블록이 상관성이 적다면 큰 패딩의 효과를 기대할 수가 없게 된다. 따라서 본 논문에서는 병합을 해 준 후에 블록의 내용을 기반으로 패딩을 해 주었다. 제안한 방식은 기존의 경계 블록 병합 기법에 비해 동일 PSNR 하에서 약 5∼8(%) 정도 부호화 비트량을 감소시켰다.

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CPN을 이용한 홍채 인식 (Iris Recognition Using a Modified CPN)

  • 홍진일;양우석
    • 전기전자학회논문지
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    • 제6권1호
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    • pp.10-20
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    • 2002
  • 눈의 홍채는 사람마다 독특한 문양을 갖고 있다. 홍채를 이용한 인식 시스템은 지문 인식 시스템보다 신뢰성이 더 높은 것으로 평가되고 있다. 본 논문은 비밀번호나 도장을 사용하지 않고도 간단히 눈동자만으로 신원을 확인할 수 있는 신분 인식 시스템을 개발하고자 하는 것이다. 홍채 인식 알고리즘은 우선 영상에서 홍채부분을 인식 분리한다. 홍채 영상이 구해지면 특이 성질들을 추출하게 된다. 특이 성질들은 웨이블렛 변환을 이용하여 구한다. 영상에서 대역별 공간별 특징이 추출되면 홍채 코드가 만들어진다. 만들어진 코드는 수정된 CPN 신경망에 입력되어 신원을 확인하게 된다. 웨이블렛 변환의 특성을 이용하여 대역별로 코드를 작성한다면 이를 이용한 인식도 저주파 대역에서 고주파 대역의 방향으로 계층적으로 수행할 수 있다. 이는 인식 시간을 최대한 단축할 수 있게 할 것이다.

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가우시안 잡음에서 변형된 LLAH 알고리즘의 성능 분석 (Performance Analysis of Modified LLAH Algorithm under Gaussian Noise)

  • 류호섭;박한훈
    • 한국멀티미디어학회논문지
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    • 제18권8호
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    • pp.901-908
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    • 2015
  • Methods of detecting, describing, matching image features, like corners and blobs, have been actively studied as a fundamental step for image processing and computer vision applications. As one of feature description/matching methods, LLAH(Locally Likely Arrangement Hashing) describes image features based on the geometric relationship between their neighbors, and thus is suitable for scenes with poor texture. This paper presents a modified LLAH algorithm, which includes the image features themselves for robustly describing the geometric relationship unlike the original LLAH, and employes a voting-based feature matching scheme that makes feature description much simpler. Then, this paper quantitatively analyzes its performance with synthetic images in the presence of Gaussian noise.

영상검색에서의 다중 피쳐 결합을 위한 변형된 보다 카운트 방법 (Modified Borda Count Method for Combining Multiple Features of Image Retrieval)

  • 정세윤;김규헌;전병태;이재연;배영래
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1999년도 추계종합학술대회 논문집
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    • pp.593-596
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    • 1999
  • In this paper, we propose an image retrieval system using the MBCM(Modified Borda Count method) in CME(Combining Multiple Experts). It combines color-, shape- and texture-based retrieval sub-systems. CME method can complementarily combine results of each retrieval system, which uses different features. There are some problems when the Borda count method in pattern recognition is applied to image retrieval. Thus, we propose a modified Borda count method to solve these problems. In the experiment, our method reduces false positive errors and produces better results than that of each retrieval module that uses only one feature.

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모바일 카메라를 이용한 경량 3D 모델링 (Light 3D Modeling with mobile equipment)

  • 주승환;서희석;한성휴
    • 디지털산업정보학회논문지
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    • 제12권4호
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    • pp.107-114
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    • 2016
  • Recently, 3D related technology has become a hot topic for IT. 3D technologies such as 3DTV, Kinect and 3D printers are becoming more and more popular. According to the flow of the times, the goal of this study is that the general public is exposed to 3D technology easily. we have developed a web-based application program that enables 3D modeling of facial front and side photographs using a mobile phone. In order to realize 3D modeling, two photographs (front and side) are photographed with a mobile camera, and ASM (Active Shape Model) and skin binarization technique are used to extract facial height such as nose from facial and side photographs. Three-dimensional coordinates are generated using the face extracted from the front photograph and the face height obtained from the side photograph. Using the 3-D coordinates generated for the standard face model modeled with the standard face as a control point, the face becomes the face of the subject when the RBF (Radial Basis Function) interpolation method is used. Also, in order to cover the face with the modified face model, the control point found in the front photograph is mapped to the texture map coordinate to generate the texture image. Finally, the deformed face model is covered with a texture image, and the 3D modeled image is displayed to the user.

Formation of biaxial-texture of Ni substrates for deposition of YBCO superconductor by electrodeposition

  • 이규환;유재무;정형식
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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    • pp.289-292
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    • 2000
  • In order to evade the patent of Oak Ridge National Laboratory (RABiTS process) and search for more economical process, a new process for producing the biaxially textured Ni tape by electrodeposition has been investigated. Electrodeposition was performed in the modified Watts bath. The crystal orientations of electrodeposited Ni were analysed by X-ray pole figure, ${\phi}$-scan and ${\omega}$-scan. The electrodeposited Ni tape showed cube texture with good out-of plane(< 8${\circ}$) and in-plane alignment(< 20${\circ}$).

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한국형 편의 육가공 제품의 가공 및 포장 개발 연구 (Development of Processing and Packaging Method for A Korean Seasoned Meat Product)

  • 이영순;이동선;류은순
    • 한국포장학회지
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    • 제13권3_4호
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    • pp.97-102
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    • 2007
  • A Korean seasoned meat product, seasoned bulgogi was developed in processing and packaging for improved convenience and extended shelf life. The optimal process conditions were found to consist of aging for $20{\sim}30$ hours at $5^{\circ}C$ and air heating for 20 minutes at $210^{\circ}C$ Aging of 24 hours could attain soft texture with little change in pH, color and total aerobic bacterial count. Appropriate drip level could be achieved at air heating of 20 minutes at $210^{\circ}C$, while the air heating at $180^{\circ}C$ could not give suitable level of texture. Modified atmosphere packaging of 60% $CO_2$ and 40% $N_2$ could preserve the product significantly better compared to control of air package and vacuumed package.

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섬유의 거칠기 측정에 있어서 비접촉식 방식과 접촉식 방식의 비교 (Comparison of contacting and non-contacting methods in measuring the surface roughness of texture)

  • 박연규;강대임;송후근;권영하
    • 감성과학
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    • 제2권1호
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    • pp.105-111
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    • 1999
  • In order to introduce the touch to engineering and industries, it must be preceded to dstablish a quantitative barometer of the feeling. for this purpose, we developed a tactile measuring system to measure physical properties of texture, such as surface roughness, friction coefficient and compliance. The tactile measuring system uses a LASER type displacement sensor, which is a non-contacting system, in measuring the surface roughness. By considering that human tactile system is a contacting mechanism, this non-contacting method needs to be modified. As a precedent research of that, we compared the contacting and non-contacting method in this paper. Surface roughness of ten cloths were measured by using the measuring system, then compared to the test results using the Kawabata evaluation system(KES), which uses a contacting method in measuring the surface roughness.

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변형된 지역 Gabor Feature를 이용한 VQ 기반의 영상 검색 (Image Retrieval using VQ based Local Modified Gabor Feature)

  • 신대규;김현술;박상희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.2634-2636
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    • 2001
  • This paper proposes a new method of retrieving images from large image databases. The method is based on VQ(Vector Quantization) of local texture information at interest points automatically detected in an image. The texture features are extracted by Gabor wavelet filter bank, and rearranged for rotation. These features are classified by VQ and then construct a pattern histogram. Retrievals are performed by just comparing pattern histograms between images. Experimental results have shown the robustness of the proposed method to image rotation, small scale change, noise addition and brightness change and also shown the possibility of the retrieval by a partial image.

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저열량 식품 소재 중 지방 대체재 (Fat replacers among low calorie food ingredients)

  • 정동철;송상훈
    • 식품과학과 산업
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    • 제52권4호
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    • pp.387-400
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    • 2019
  • Fat replacers are divided into three categories. These include carbohydrate-based, protein-based and fat-based replacers. Carbohydrate-based replacers occupy half of the fat replacers market. The main ingredients of carbohydrate-based are gums, starch, modified starch, cellulose and fiber. The functional properties of fat replacers are to retain moisture, to retard staling, to provide mouthfeel and texture, to emulsify, to stabilize emulsion, and to reduce fat. Using these functionalities, fat replacers are used in various foods such as baked goods, salad dressing, sauces, meat products, dairy products, frying foods, bakery, and confectionery. Success factors of fat replacers in the market are sensory equivalent, texture and safety as food ingredients.