視頻特技外文翻譯-文庫吧資料
2025-05-21 18:06本頁面
【正文】 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 interactive to assist users in the process of creating digital nonphotorealistic animations. Fekete et al. describe a system[23] to assist in the creation of line art cartoons. Agarwala proposes an interactive system[2] that allows children and others untrained in “cel animation” to create 2D cartoons from images and video. Users have to handsegment the first image, and active contours(snakes) are used to track the segmentation boundaries from frame to frame. It is labor intensive(usersneed to correct the contours every frame), unstable(due to susceptibility of snakes to local minima and tracking fails under occlusion) and limited to video material with distinct objects and welldefined edges. Another technique is called “advanced rotoscoping” by the Computer Graphics munity, which requires artists to draw a sha
畢業(yè)設計相關推薦
鄂ICP備17016276號-1