• Title/Summary/Keyword: Image Clipping

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A New Mobile Content Adaptation Based on Content Provider-Specified Web Clipping (컨텐츠 제공자 지정 웹 클리핑 방식의 이동 인터넷 컨텐츠 변환)

  • Yang, Seo-Min;Lee, Hyuk-Joon
    • The KIPS Transactions:PartB
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    • v.11B no.1
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    • pp.35-44
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    • 2004
  • Web contents created for desktop screens give rise to problems when they are to be displayed on the small screens of mobile terminals. While in some cases some of the objects of a page may not be displayable due to the lack of browser capability, the entire page may not be displayable due to the incompatibility with the browser in other cases. In this paper, we introduce a new mobile content adaptation approach based on web clipping, which transforms an original page into one that is optimally displayed on a mobile terminal. In this method, a source page is automatically clipped and transformed according to the clip specification made by the content provider using a clip editing tool. The clip editing tool allows the user to specify group clips, multi-level cups and dynamic clips as well as simple clips, and the presentation layout through a graphic user interface. Based on the clip specifications, each clip is transformed into an intermediate meta-language document, which in turn is transformed into a presentation page in the target markup language. Transcoding of image objects in major image file formats is also supported.

Color Correction of the Color Difference in the PT Space for HDR Image Tone Compression using iCAM06 (iCAM06을 적용한 HDR 영상 톤 압축을 위한 PT 색차 정보 기반의 색 보정)

  • Chae, Seok-Min;Lee, Sung-Hak;Sohng, Kyu-Ik
    • Journal of Korea Multimedia Society
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    • v.16 no.3
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    • pp.281-289
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    • 2013
  • The iCAM06 has been used as an image appearance model for HDR image rendering. The iCAM06 goes through the color space conversions and scale conversions of the several steps to present HDR images. The dynamic range of an HDR image needs to be mapped on the range of output devices, which is called the tone mapping. However, tone compression process of the iCAM06 causes color distortion because of color-clipping and cross-stimulus. Therefore, we proposed that a color correction method in IPT space which compensates the color distortion in tone compression process. Through the experimental results, we conformed that proposed color correction method had better performance than the iCAM06 and enhanced models.

A Robustness of Watermarking Using Random Dot Distribute Image (랜덤한 점분포를 가진 영상을 사용한 워터마킹의 견고성)

  • 이인정
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • 2002.11a
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    • pp.66-71
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    • 2002
  • In Generally, a imbedding and extracting is good as watermark using a random dot image. In this paper, when the autostreogram which has some randomness is used watermark image, distortion rate is low and extraction rate is high. Using this quality, when any logo image is transformed to same image domain randomly, distortion rate is low and extraction rate is high, more over the robustness is good in spite of hard clipping.

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A Robustness of Watermarking Using Random Dot Distribute Image (랜덤한 점분포를 가진 영상을 사용한 워터마킹의 견고성)

  • 이인정
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 2002.11a
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    • pp.66-71
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    • 2002
  • In Generally, a imbedding and extracting is good as watermark using a random dot image. In this paper, when the autostreogram which has some randomness is used watermark image, distortion rate is low and extraction rate is high. Using this quality, when any logo image is transformed to same image domain randomly, distortion rate is low and extraction rate is high, more over the robustness is good in spite of hard clipping.

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Estimation of Rotation of Camera Direction and Distance Between Two Camera Positions by Using Fisheye Lens System

  • Aregawi, Tewodros A.;Kwon, Oh-Yeol;Park, Soon-Yong;Chien, Sung-Il
    • Journal of Sensor Science and Technology
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    • v.22 no.6
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    • pp.393-399
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    • 2013
  • We propose a method of sensing the rotation and distance of a camera by using a fisheye lens system as a vision sensor. We estimate the rotation angle of a camera with a modified correlation method by clipping similar regions to avoid symmetry problems and suppressing highlight areas. In order to eliminate the rectification process of the distorted points of a fisheye lens image, we introduce an offline process using the normalized focal length, which does not require the image sensor size. We also formulate an equation for calculating the distance of a camera movement by matching the feature points of the test image with those of the reference image.

A Design of 2D Vector Graphics Accelerator with a Modified Scan-line Edge flag Algorithms including Clipping and Super Sampling (클리핑과 슈퍼샘플링을 포함한 스캔라인 엣지 플래그 방식의 2D 벡터 그래픽 가속기 설계)

  • Lee, Kwang-Yeob
    • Journal of IKEEE
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    • v.12 no.2
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    • pp.124-130
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    • 2008
  • Vector Graphics describes an image with mathematical statements instead of pixel information. Which enables easy scalability without loss in image quality and usually results in a much smaller file size compared with bitmap images. In this paper, we propose Vector Graphics Accelerator for mobile device with scan-line edge flag algorithm to render vector image without sorting process of edge. Proposed Vector Graphics Accelerator was verified with OpenVG 2D Vector image. The estimated processing time of proposed Accelerator with Tiger image is 12ms on Tessellation process, and total rendering time is 208ms. Estimated rendering performance with Tiger image is about 5 frame per second

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An adaptive digital watermark using the spatial masking (공간 마스킹을 이용한 적응적 디지털 워터 마크)

  • 김현태
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.9 no.3
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    • pp.39-52
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    • 1999
  • In this paper we propose a new watermarking technique for copyright protection of images. The proposed technique is based on a spatial masking method with a spatial scale parameter. In general it becomes more robust against various attacks but with some degradations on the image quality as the amplitude of the watermark increases. On the other hand it becomes perceptually more invisible but more vulnerable to various attacks as the amplitude of the watermark decreases. Thus it is quite complex to decide the compromise between the robustness of watermark and its visibility. We note that watermarking using the spread spectrum is not robust enought. That is there may be some areas in the image that are tolerable to strong watermark signals. However large smooth areas may not be strong enough. Thus in order to enhance the invisibility of watermarked image for those areas the spatial masking characteristics of the HVS(Human Visual System) should be exploited. That is for texture regions the magnitude of the watermark can be large whereas for those smooth regions the magnitude of the watermark can be small. As a result the proposed watermarking algorithm is intend to satisfy both the robustness of watermark and the quality of the image. The experimental results show that the proposed algorithm is robust to image deformations(such as compression adding noise image scaling clipping and collusion attack).

GPU based Maximum Intensity Projection using Clipping Plane Re-rendering Method (절단면 재렌더링 기법을 이용한 GPU 기반 MIP 볼륨 렌더링)

  • Hong, In-Sil;Kye, Hee-Won;Shin, Yeong-Gil
    • Journal of Korea Multimedia Society
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    • v.10 no.3
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    • pp.316-324
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    • 2007
  • Maximum Intensity Projection (MIP) identifies patients' anatomical structures from MR or CT data sets. Recently, it becomes possible to generate MIP images with interactive speed by exploiting Graphics Processing Unit (GPU) even in large volume data sets. Generally, volume boundary plane is obliquely crossed with view-aligned texture plane in hardware-texture based volume rendering. Since the ray sampling distance is not increased at volume boundary in volume rendering, the aliasing problem occurs due to data loss. In this paper, we propose an efficient method to overcome this problem by Re-rendering volume boundary planes. Our method improves image quality to make dense distances between samples near volume boundary which is a high frequency area. Since it is only 6 clipping planes are additionally needed for Re-rendering, high quality rendering can be performed without sacrificing computational efficiency. Furthermore, our method couldbe applied to Minimum Intensity Projection (MinIP) volume rendering.

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A Study on the OFDM System with Clipping Method for Underwater Communication (수중통신에서 클리핑 기법을 적용한 OFDM 시스템 연구)

  • Han, Jeong-Woo;Kim, Se-Young;Kim, Ki-Man;Jung, Ji-Won;Kim, Seung-Joo;Chun, Seung-Yong;Son, Kwon;Dho, Kyoung-Cheol
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.5
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    • pp.432-440
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    • 2009
  • Recently, the necessity of underwater acoustic communication and demand for transmitting and receiving various data such as voice or high resolution image data are increasing as well. The performance of underwater acoustic communication system is influenced by underwater channel characteristic. Especially, a delay spread caused by reverberation and multi-path induces the ISI (Inter-Symbol-Interference) and reduces the communication performance. In this paper, we study the OFDM (Orthogonal Frequency Division Multiplexing) technique for robust the delay spread in underwater channel. We also use the clipping method to overcome the performance degradation in high PAPR (Peak-to-Average Power Ratio). We confirm the performances of underwater communication system by the underwater channel model simulation model and experiment in small water tank. As a result, the multi-carrier modulation with clipping method presented low BER and the previous single carrier modulation had high BER.

An Efficient Rectangle Image Clipping Algorithm Using Region Pattern (영역패턴을 이용한 효과적인 사각형 이미지 절단 알고리즘)

  • Choi, Kyoung-Jin
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.05a
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    • pp.1621-1624
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    • 2004
  • 본 논문에서는 2차원 공간상에서 윈도우에 출력되는 사각형 이미지가 윈도우 영역을 벗어날 때 영역 패턴을 이용한 절단 알고리즘을 제안한다. 제안하는 알고리즘은 Cohen-Sutherland의 알고리즘을 응용하여 사각형 이미지의 절단영역을 계산하는데, 약 4회의 조건문장과 1회의 분기문장을 사용하여 수행되므로 기존의 방법보다 전체적인 수행 성능이 약 12% 좋게 나타났으며, 특히 확장영역에 있어 기존의 방법은 처리하지 못하는 부분까지도 완벽하게 처리됨을 확인 할 수 있었다.

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