用於光影塗鴉之基於樣本學習的曝光合成技術

光影塗鴉是利用相機長曝光去記錄光源運動的軌跡所形成之照片，藉由此種技術，我們便像是在真實世界中作畫一般。但是由於理想運動軌跡和真實運動軌跡的差異，我們所繪製的光影塗鴉之內容經常因為過於雜亂而導致無法辨識。在本篇論文之中，我們提供一個藉由樣本學習的方法來合成長曝光照片之系統去改善上述的問題。我們憑藉使用者輸入的筆劃和輸入影片來合成長曝光之照片。並且利用影片的時空線索，我們可以修改光源運動的路徑、線段型式、筆劃粗細，但卻能夠保持光源與環境間的互動關係。除此之外，我們更可以結合以上的修改方式合成一段令人驚豔的動畫影片。

關鍵字

光影塗鴉；基於樣本學習合成；曝光合成；最佳化；最短路徑

並列摘要

Light painting is a photographic technique, where photographer takes a long exposure to record the light motion in the low light environment, like painting the world with light. However, the painting results are always unrecognizable because there are many differences between the exact motion paths we painted and ideal motion paths we wanted. In this thesis, we present a framework for synthesizing realistic long exposure images using example-based method to solve the problem above. In our approach , we synthesize the long exposure image guided by user strokes from input frames. With the spatial-temporal information of light source, we can edit the result of light painting such as its motion, color, line type, and scale while it still remains realistic interaction with environment. Moreover, we can combine the editing techniques mentioned above to synthesize a fabulous animation as its application.

並列關鍵字

Light Painting ； Example-Based Synthesis ； Exposure Synthesis ； Optimization ； Shortest Path

參考文獻

[1] Michael Ashikhmin. Synthesizing natural textures. In In ACM Symposium on Interactive

3D Graphics, pages 217–226.

[2] colourblindmonkey. Photography contest - light painting. http:

[3] Alexei A. Efros and William T. Freeman. Image quilting for texture synthesis and

[4] David J. Heeger and James R. Bergen. Pyramid-based texture analysis/synthesis. In

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用於光影塗鴉之基於樣本學習的曝光合成技術

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