視頻特技外文翻譯(已修改)
2025-05-31 18:06 本頁面
【正文】 Video Special Effects Peng Huang Objectspace NPAR Meier was the first one who produced painterly animations from objectspace scenes[53].He triangulated surfaces in objectspace and distributed strokes over each triangle in proportion to its area. Since his initial work, many objectspace NPAR systems have been presented. Hall’s Qmaps[29](A Qmap is a 3D texture which adapts to the intensity of light to give the object in the image a 3D look, for example, more marks are made where an object is darker) may be applied to create coherent penandink shaded system capable of rendering objectspace eometries in a sketchy style was outlined by Curtis[15], and operates by tracing the paths of particles traveling stochastically around contours of a depth image generated from a 3D object. See Figure for some addition, most modern graphical modeling packages(3D Studio MAX!,Maya,XSI SoftImage) support plugins which offer the option of rendering objectspace scenes to give a flat shaded, cartoonlike appearance. Imagespace NPAR Most NPAR systems in imagespace are still based on static painterly rendering techniques,brushing strokes frame by frame and trying to avoid unappealing swimming which distractsthe audience from the content of the animation. Liwinowicz extends his static method and makes use of optical flow to estimate a motion vector field to translate the strokes painted on the first frame to successive frames[47]. A similar method is employed by Kovacs and Sziranyi[42]. A simpler solution is proposed by Hertzmann[33], who differences consecutive frames of video, repainting only those areas which have changed above some global(userdefined) threshold. Hays and Essa’s approach[32] builds on and improves these techniques by using edges to guide painterly refinement. See Figure for some examples. In their current work, they are looking into studying regionbased methods to extend beyond pixels to cellbased renderings, which implies the trend from lowlevel analysis to higherlevel scene understanding. We also find various imagespace tools which are highly in
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