• Title/Summary/Keyword: alpha rendering

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An Adaptive System for Effective Fur rendering (효과적인 Fur 렌더링을 위한 적응적 시스템 -혼합 렌더링을 이용한 빠른 Fur 렌더링 방법-)

  • Kim, Hye-Sun;Ban, Yun-Ji;Lee, Chung-Hwan;Nam, Seung-Woo;Choi, Jin-Sung;Oh, Jun-Kyu
    • 한국HCI학회:학술대회논문집
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    • 2009.02a
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    • pp.719-724
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    • 2009
  • Fur rendering is difficult in that there are huge numbers of objects and it takes so much time. The previous method considers fur as cylinder, transforms it into 2D ribbon, triangulates and commits rendering. But this method has problem like under sampling and takes rendering time so long. To resolve these shortcuts we proposed new algorithm. We divide fur into thick and thin fur and we applied adaptive rendering methods for each type of fur. Also we can perform an effective rendering according to the proposed rendering framework.

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Effective Image Sequence Format in 3D Animation Production Pipeline (3D 애니메이션 제작 공정에 있어서 효율적인 이미지 시퀀스 포맷)

  • Kim, Ho
    • The Journal of the Korea Contents Association
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    • v.7 no.8
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    • pp.134-141
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    • 2007
  • In 3D animation rendering process, Although we can render the output as a movie file format, most productions use image sequences in their rendering pipelines. This Image Sequence rendering process is extremely important step in final compositing in movie industries. Although there are various type of making image rendering processes, TGA format Is one of most widely used bitmap file formats using in industries. People may ask TGA format is most suitable for in any case. As we know 3D softwares have their own image formats. so we need to testify on this. In this paper, we are going to focus on Alias' 3D package software called MAYA which we will analyze of compressing image sequence, Image quality, supporting Alpha channels in compositing, and Z-depth information. The purpose of this paper is providing to 3D Pipeline as a guideline about effective image sequence format.

A Study on the Effective Image Sequence Format in 3D Animation Production (3D 애니메이션 제작에 있어서 효율적인 Image Sequence format에 관한 연구)

  • Kim Ho
    • Proceedings of the Korea Contents Association Conference
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    • 2005.11a
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    • pp.131-136
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    • 2005
  • In 3D animation rendering process, Although we can render the output as a movie file format, most productions use image sequences in their rendering pipelines. This Image Sequence rendering process is extremely important step in final compositing in movie industries. Although there are various type of making image rendering processes, TGA format is one of most widely used bitmap file formats using in industries. People may ask TGA format is most suitable for in any case. As we know 3D softwares have their own image formats. so we need to testify on this. In this paper, we are going to focus on Alias' 3D package software called MAYA which we will analyze of compressing image sequence, Image quality, supporting Alpha channels in compositing, and Z-depth Information. The purpose of this paper is providing to 3D Pipeline as a guideline about effective image sequence format.

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Vision-Based Haptic Interaction Method for Telemanipulation: Macro and Micro Applications (원격조작을 위한 영상정보 기반의 햅틱인터렉션 방법: 매크로 및 마이크로 시스템 응용)

  • Kim, Jung-Sik;Kim, Jung
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1594-1599
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    • 2008
  • Haptic rendering is a process that provides force feedback during interactions between a user and an object. This paper presents a haptic rendering technique for a telemanipulation system of deformable objects using image processing and physically based modeling techniques. The interaction forces between an instrument driven by a haptic device and a deformable object are inferred in real time based on a continuum mechanics model of the object, which consists of a boundary element model and ${\alpha}$ priori knowledge of the object's mechanical properties. Macro- and micro-scale experimental systems, equipped with a telemanipulation system and a commercial haptic display, were developed and tested using silicone (macro-scale) and zebrafish embryos (micro-scale). The experimental results showed the effectiveness of the algorithm in different scales: two experimental systems applied the same algorithm provided haptic feedback regardless of the system scale.

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Effective Depth of Field Implementation Based on Standard Normal Distribution and Multiple Layers (표준 정규 분포 및 다층 레이어 기반의 효과적인 피사계 심도 구현)

  • Choi, Mookang;Kim, Yeri;Kim, Minji;Oh, Kyoungsu
    • Journal of Korea Game Society
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    • v.20 no.6
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    • pp.53-62
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    • 2020
  • This paper proposes on the implementation method of depth of field effect based on backward mapping method available in real-time rendering enviroment using calculation of sampling range based on standard normal distribution and alpha blending of color of layers. To implement the effect, this paper describe how to calculate radius of circle of confusion, establish sampling radius using circle of confusion, and determine color through alpha blending of the multiple layer and denoising.

High efficient Transflective TFT-LCD by tRGB-rW Sub-Pixel Rendering

  • Lin, L.;Liang, B.J.;Huang, C.M.;Lin, H.C.;Chen, Y.N.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1613-1617
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    • 2006
  • The total light efficiencies of the novel 1.9" transflective tRGB-t/rW and tRGB-rW TFT LCDs are calculated and they are implemented by the traditional 7-mask ${\alpha}$-Si processing. Then, the two vehicles are turned on with the appropriate Sub-Pixel Rendering White (SPRW) algorithms, so they can exhibit the extra luminance without the original visual resolution loss. Their outstanding optical properties are approved by measuring the contrast ratio (C.R.) and the NTSC ratio. Because they utilize the light resource very effectively and efficiently, they are very suitable for the dark indoor and the bright outdoor environments.

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A NEW APPROACH FOR RANKING FUZZY NUMBERS BASED ON $\alpha$-CUTS

  • Basirzadeh, Hadi;Abbasi, Roohollah
    • Journal of applied mathematics & informatics
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    • v.26 no.3_4
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    • pp.767-778
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    • 2008
  • Comparison between two or more fuzzy numbers, along with their ranking, is an important subject discussed in scholarly articles. We endeavor in this paper to present a simple yet effective parametric method for comparing fuzzy numbers. This method offer significant advantages over similar methods, in comparing intersected fuzzy numbers, rendering the comparison between fuzzy numbers possible in different decision levels. In the process, each fuzzy number will be given a parametric value in terms of $\alpha$, which is dependent on the related $\alpha$-cuts. We have compared this method to Cheng's centroid point method [5] (The relation of calculating centroid point of a fuzzy number was corrected later on by Wang [12]). The proposed method can be utilized for all types of fuzzy numbers whether normal, abnormal or negative.

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A Study on the Improving the Rendering Performance of the 3D Road Model for the Vehicle Simulator (차량 시뮬레이터를 위한 3차원 도로모델의 렌더링 성능 향상에 관한 연구)

  • Choi, Young-Il;Jang, Suk;Kim, Kyu-Hee;Cho, Ki-Yong;Kwon, Seong-Jin;Suh, Myung-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.162-170
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    • 2004
  • In these days, a vehicle simulator is developed by using a VR(Virtual Reality) system. A VR system must provide a vehicle simulator with a natural interaction, a sufficient immersion and realistic images. To achieve this, it is important to provide a fast and uniform rendering performance regardless of the complexity of virtual worlds or the level of simulation. In this paper, modeling methods which offer an improved rendering performance for complex VR applications as 3D road model have been implemented and verified. The key idea of the methods is to reduce a load of VR system by means of LOD(Level of Detail), alpha blending texture mapping, texture mip-mapping and bilboard. Hence, in 3D road model where a simulation is complex or a scene is very large, the methods can provide uniform and acceptable frame rates. The VR system which is constructed with the methods has been experimented under the various application environments. It is confirmed that the proposed methods are effective and adequate to the VR system which associates with a vehicle simulator.

Arctigenin Inhibits Etoposide Resistance in HT-29 Colon Cancer Cells during Microenvironmental Stress

  • Yoon, Sae-Bom;Park, Hae-Ryong
    • Journal of Microbiology and Biotechnology
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    • v.29 no.4
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    • pp.571-576
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    • 2019
  • Microenvironmental stress, which is naturally observed in solid tumors, has been implicated in anticancer drug resistance. This tumor-specific stress causes the degradation of topoisomerase $II{\alpha}$, rendering cells resistant to topoisomerase $II{\alpha}$-targeted anticancer agents. In addition, microenvironmental stress can induce the overexpression of 78kDa glucose regulated protein (GRP78), which can subsequently block the activation of apoptosis induced by treatment with anticancer agents. Therefore, inhibition of topoisomerase $II{\alpha}$ degradation and reduction in GRP78 expression may be effective strategies for inhibiting anticancer drug resistance. In this study, we investigated the active compound arctigenin, which inhibited microenvironmental stress-induced etoposide resistance in HT-29 cells. Arctigenin was also highly toxic to etoposide-resistant HT-29 cells, with an $IC_{50}$ value of $10{\mu}M$ for colony formation. We further showed that arctigenin inhibited the degradation of topoisomerase $II{\alpha}$ and reduced the expression of GRP78. Thus, these results suggest that arctigenin is a novel therapeutic agent that inhibits resistance to etoposide associated with microenvironmental stress conditions.

ESCAPE OF RESONANTLY SCATTERED LYβ AND Hα FROM HOT AND OPTICALLY THICK MEDIA

  • Chang, Seok-Jun;Lee, Hee-Won;Ahn, Sang-Hyeon;Lee, Hogyu;Angeloni, Rodolfo;Palma, Tali;Di Mille, Francesco
    • Journal of The Korean Astronomical Society
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    • v.51 no.1
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    • pp.5-16
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    • 2018
  • We investigate the escape of $Ly{\beta}$ from emission nebulae with a significant population of excited hydrogen atoms in the level n = 2, rendering them optically thick in $H{\alpha}$. The transfer of $Ly{\beta}$ line photons in these optically thick regions is complicated by the presence of another scattering channel leading to re-emission of $H{\alpha}$, alternating their identities between $Ly{\beta}$ and $H{\alpha}$. In this work, we develop a Monte Carlo code to simulate the transfer of $Ly{\beta}$ line photons incorporating the scattering channel into $H{\alpha}$. Both $H{\alpha}$ and $Ly{\beta}$ lines are formed through diffusion in frequency space, where a line photon enters the wing regime after a fairly large number of resonance scatterings with hydrogen atoms. Various line profiles of $H{\alpha}$ and $Ly{\beta}$ emergent from our model nebulae are presented. It is argued that the electron temperature is a critical parameter which controls the flux ratio of emergent $Ly{\beta}$ and $H{\alpha}$. Specifically for $T\;=\;3{\times}10^4\;K$ and $H{\alpha}$ line center optical depth $\tau{\alpha}\;=\;10$, the number flux ratio of emergent $Ly{\beta}$ and $H{\alpha}$ is ~ 49 percent, which is quite significant. We propose that the leaking $Ly{\beta}$ can be an interesting source for the formation of $H{\alpha}$ wings observed in many symbiotic stars and active galactic nuclei. Similar broad $H{\alpha}$ wings are also expected in $Ly{\alpha}$ emitting halos found in the early universe, which can be potentially probed by the James Webb Telescope in the future.