鉛筆素描草圖筆觸之模擬

Abstract

本篇論文提出一套將影像自動轉換成鉛筆素描草圖的流程，我們的方法主要是將影像分為輪廓與斜線筆觸兩大部分處理，輪廓部分乃利用FDoG方法處理ETF影像向量流圖，擷取而得；再配合相對應之切線與曲率半徑資料來控制筆觸方向、長度、寬度及濃度，產生自然且富有變化性之鉛筆輪廓草圖素描。斜線筆觸則補強了素描另一層面之呈現。 此論文提出的方法以符合實際人工作畫流程的角度切入，增加了手繪的自然性而不需互動式人為的介入。

In this thesis, an automated process for simulating shape drafting in pencil-sketch is presented. In the system Silhouette process and hatching process comprised the core of the automation. The silhouettes are extracted by FDoG operation on ETF map, along which such geometric information as tangents and radius of curvatures are exploited for presenting shape drafting strokes that gives hand-sketched looking. The hatching process enriches the sketch in the aspects other than silhouette handling. The study presented in the thesis incorporates in the design the considerations on silhouette drawing as would be handled in general sketching practice by hand, and thus bring about remarkably more human-taste to be seen in the outcomes.