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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

使用可控制反應擴散之影像風格化技術 / Controllable reaction diffusion for image stylization

劉維晉, Liu, Wei Ching Unknown Date (has links)
影像風格化是一種改變輸入影像的重要技術,其用來加強圖像的特徵並傳達視覺上的資訊,其中圖案的形狀與分布構成的風格化的基本要素。然而對於初學者而言,設計一個新的風格化圖案以及適當的分佈配置是不容易的。在本文中,提出了一個使用異向性反應擴散的圖像風格化以及圖案生成的方法,並從已知的反應擴散圖案為基礎做延伸,同時保有反應擴散的自我組織圖案的特性。為了能夠有效的控制圖案的生成,利用調整後的異向性擴散用來控制圖案的形狀並結合流場調整圖案的排列。圖案的大小、密度、方向以及風格化樣式可藉由閥值的調整以及顏色映射加以控制。最後本系統用來生成剪紙、風格化半色調影像以及流場的視覺化的結果以突顯本系統之特色。 / Image stylization is an essential technique to create the style of input images, enhance image features, and express visual cues. The shape and distribution of the primitive are essential elements in stylization. However, designing a new pattern or creating an appropriate distribution can be challenging for novice users. In this paper, an anisotropic reaction diffusion system for image stylization and pattern generation is proposed. This system starts from modify existed reaction diffusion formula, but keeps the behaviors of reaction diffusion: self-organized patterns, stable pattern generation and multiple styled pattern. To enable more effective control over pattern generation, the proposed method utilizes a set of modifications on anisotropic diffusion to control shape and introduces a flow field to guide pattern arrangement. The size, density, orientation, and pattern style can be controlled by thresholding and toon mapping. The proposed system was used to generate images in the paper-cut, stylized halftone, and flow visualization, and the results are presented to highlight the control factors of the proposed system.
2

基於反應-擴散之傳統獸面紋圖樣對應產生技術 / The pattern generation technology of traditional animal-mask decoration based on reaction-diffusion

劉偉正, Liou, Wei Cheng Unknown Date (has links)
中國歷代的各種藝術品與建築上富有多樣的裝飾紋樣,多是古人根據自然現象與生物的觀察加以風格化而成。而非相片寫實電腦繪圖技術(Non-photorealistic Rendering)之目的是分析各種繪畫形式的規則並且建立出一套生成系統。本論文以裝飾紋路中的傳統獸面紋圖樣做為研究對象及發展其生成技術,分析傳統獸面紋結構並找出生物與獸面紋間的關聯性,對資料庫進行結構性比對方法來進行五官特徵的生成並改善現有著作之成果。在花紋特徵生成上,應用了反應-擴散(Reaction-Diffusion)方法來保留和風格化輸入影像的花紋特徵並用以強化獸面紋的裝飾,同時也能根據給定向量場的資訊擴散出符合向量流向的背景裝飾紋路。結合以上之特徵,所提出的系統可生成出一張具傳統獸面紋風格之影像,並做出可應用在東方風格之遊戲或是商標上的結果。
3

離散型反應擴散方程的全解 / Entire Solutions for Discrete Reaction-Diffusion Equations

王宏嘉, Wang,Hong-Jia Unknown Date (has links)
這篇文章中,我們探討離散型反應擴散方程u_t(x,t)=u(x+1,t)-2u(x,t)+u(x-1,t)+f(u(x,t)),其中 反應項f(u)=u^2(1-u)。在此, 我們證明此方程式存在一種全解其動態行為宛如兩個來自x軸兩端相向而行的行波。 / This paper deals with a discrete reaction-diffusion equation u_t(x,t)=u(x+1,t)-2u(x,t)+u(x-1,t)+f(u(x,t)), where f(u)=u^2(1-u). Here, we prove there exist entire solutions which behave as two traveling waves coming from both sides of x-axis.

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