| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 102 === In pastel drawing simulation, the handling of pastel stokes of various lengths, orientations and colors are essential. In this thesis, two more issues are taken into account in the hope of adding more human-drawing flavor to the pastel drawing conversion, namely to apply pastel strokes of appropriate width and spacing onto adequate regions in the drawing.
An automated system has been implemented and put into work, of which the process consists of four major stages:
Classification of the HSV color space into a 432 color palette, in addition to the classification of gradient space into 8 major orientations.
An initial image segmentation into units of 3×3 pixel is conducted and in each of the 3×3 regular segment unit, representative color-index and reference direction of stroke-path are established.
Regular segments are grouped into large units according to color information; depending on the number of regular segments, each of the larger units is classified as large, medium and small regions. For each region in the three-sized class, corresponding stroke-path, stroke-width and spacing are assigned.
Rendering of pastel strokes in each region is performed alone every stroke-path accordingly, with some final touch for enhancing the flavor of hand-drawing.
The final outcome of the conversion in many cases demonstrates enhance visual effect, namely back-and-forth, wide-and-sparse line patterns while drawing large region of low color-contrast and thus more flavor of hand-drawing, as compared to a previous pastel-drawing simulation system.
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