• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.706-708
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• 2002

3차원 텍스쳐 기반의 볼륨 렌더링 기법은 추가적인 하드웨어가 필요 없기 때문에 개발비용이 적다는 장점이 있지만 다각형 기반 렌더링에 최적화 된 범용 그래픽 하드웨어를 그대로 사용하기 때문에 성능이 낮다는 단점이 있다. 이에 본 논문에서는 병렬 구조의 고성능 볼륨 렌더링 시스템에서 사용되던 볼륨 정보 분한 기법을 범용 그래픽 하드웨어에 적용하는 새로운 3차원 텍스쳐 기반 볼륨 그래픽 구조를 제안한다. 제안하는 구조를 통해 볼륨 정보를 분할하여 처리하면, 번용 그래픽 하드웨어가 갖고 있던 물리적 메모리 크기의 한계성을 극복할 수 있다. 또한 전체 해상도의 알파 블렌딩이 아닌 분할된 볼륨 정보 하나가 차지하는 크기만큼의 작은 해상도로 알파 블렌딩을 수행함으로서 렌더링 단계와 프레임 버퍼간의 데이터 전송량을 1/30로 줄이고 픽셀 캐시의 적중률을 99.9%에 근접하게 높일 수 있다.

• 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.

• 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.

• The Journal of the Korea Contents Association
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• v.8 no.1
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• pp.272-281
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• 2008

A layer channel, which can express effects on 3D image, is inserted to use it on application rendering effectively. The current method of effect rendering requires individual sources in storage and image processing, because it uses individual and mixed management of images and effects. However, we can save costs and improve results in images processing by processing both image and layer channels together. By changing image format to insert a layer channel in image and adding a hide function to conceal the layer channel and control to make it possible to approach image and layer channels simultaneously during loading image and techniques hiding the layer channel by changing image format with simple techniques, like alpha blending, etc., it is developed to improve reusability and be able to be used in all programs by combining the layer channel and image together, so that images in changed format can be viewed in general image viewers. With the configuration, we can improve processing speed by introducing image and layer channels simultaneously during loading images, and reduce the size of source storage space for layer channel images by inserting a layer channel in 3D images. Also, it allows managing images in 3D image and layer channels simultaneously, enabling effective expressions, and we can expect to use it effectively in multimedia image used in practical applications.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.560-569
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• 2011

In this paper, we propose a text processing method for Hindi characters, Devanagari scripts, in the Android. The key points of the text processing are to device automata, which define the combining rules of alphabets into a set of syllables, and to implement a font rendering engine, which retrieves and displays the glyph images corresponding to specific characters. In general, an automaton depends on the type and the number of characters. For the soft-keyboard, we designed the automata with 14 consonants and 34 vowels based on Unicode. Finally, a combined syllable is converted into a glyph index using the mapping table, used as a handle to load its glyph image. According to the multi-lingual framework of Freetype font engine, Dvanagari scripts can be supported in the system level by appending the implementation of our method to the font engine as the Hindi module. The proposed method is verified through a simple message system.