共查询到19条相似文献，搜索用时 171 毫秒
1.
真实感人脸动画一直是计算机图形学一个重要而富有挑战性的课题．改变传统的计算机动画系统只实现对一个人脸模型模拟动画．实现了对任意特定人脸表情动画进行逼真模拟,采用了基于改进的散乱数据插值算法构建线性弹性模型,基于多视角照片从一般人脸模型到特定人脸模型修改,自适应人脸肌肉模型特定化技术以及基于肌肉模型的皱纹模拟技术．实验证明,这一系列技术所得到的人脸动画效果优于传统的动画效果． 相似文献
2.
计算机合成真实感人脸是计算机图形学研究的一个热点。也是一个难点。人脸建模和动画被广泛应用于娱乐业、商业、服务业、医学以及教育等许多领域。真实感人脸合成包括脸部数据的获取、人脸几何建模和真实感人脸生成3个环节。 相似文献
3.
余淼 《江苏广播电视大学学报》2008,19(5):41-44
面向动画创作的三维人脸表情动画生成框架由人脸模型简化、特征点驱动以及表情动画生成等三部分组成。以MPEG-4人脸动画定义标准为基础,提出了以脸部定义参数流驱动关键特征点的动画生成算法。实验结果表明：该方法实现了真实感和实时性的有效结合,能满足动画创作的要求。 相似文献
4.
王云峰 《河北职业技术学院学报》2008,8(6)
提出了一个基于彩色照片的个性化人脸建模的新方法.根据MPEG-4确定出标准模型特征点的位置.从正面和侧面两幅照片出发,首先进行了这两幅彩色图像人脸边缘特征提取,接着定位进行特征点编辑,获取人脸的关键特征点的位置,然后对标有对应特征点的标准模型进行变形,进行纹理映射,最后获得了真实的个性化人脸模型,两张照片可以合成任意角度视图.以该方法建立的人脸模型精度比较高,可以快速地建立个性化人脸模型,为三维人脸动画提供了真实模型. 相似文献
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具有真实感的三维人脸模型在虚拟现实、数字广播、数字教育、仿真应用、游戏娱乐、影视制作等领域都有着广泛的应用前景,文章对基于真实人脸的数字化三维人脸建模技术进行了研究。主要内容包括：目前构造人脸模型的方法,通用人脸模型的生成,人脸特征点的提取,利用提取的人脸特征点重构三维人脸模型,真实人脸纹理合成,最后对真实感的三维人脸建模技术进行了展望。 相似文献
6.
王云峰 《廊坊师范学院学报(自然科学版)》2008,8(6):36-38
提出了一个基于彩色照片的个性化人脸建模的新方法。根据MPEG-4确定出标准模型特征点的位置,从正面和侧面两幅照片出发,首先进行了这两幅彩色图像人脸边缘特征提取,接着定位进行特征点编辑,获取人脸的关键特征点的位置,然后对标有对应特征点的标准模型进行变形,进行纹理映射,最后获得了真实的个性化人脸模型,两张照片可以合成任意角度视图。以该方法建立的人脸模型精度比较高,可以快速地建立个性化人脸模型,为三维人脸动画提供了真实模型。 相似文献
7.
徐莹 《绵阳师范学院学报》2010,29(5):112-116
基于Bezier曲线进行人脸建模,并实现了从一般人脸模型到特定人脸模型修改。为了使特定的人脸模型更加具有真实感,必须给这个曲面人脸模型赋予真实的纹理信息。该文引入多视角图像纹理信息技术,取得很好的效果。 相似文献
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三维建模是计算机图形学和计算机视觉领域的基本问题。人脸具有共性强及个性鲜明的特点,成为众多三维建模算法的实验平台。但由于人脸的多样性、复杂性,建立真实感强的目标三维人脸模型在学术研究和实际应用方面都具有重要意义。在文献梳理的基础上,阐述了真实感三维人脸建模理论和实践相关研究成果,总结了目前三维人脸重建的研究方法,分析了各种三维人脸重建方法的优缺点,提出了有待进一步研究的问题,展望了未来的发展趋势。 相似文献
9.
本文提出了一种真实感三维人脸自动建模方法,只需一张光照均匀的人脸正面头像,通过自动提取面部的关键特征点重建人脸的几何模型,最后从图像上获取面部纹理信息得到真实感的三维人脸。实验表明该方法能较真实有效地重建三维人脸。 相似文献
10.
研究了一种基于正面人脸照片的真实感三维人脸自动重建方法,并运用计算机视觉图OpenCV和图形开发库OpenGL,在VC++6.0环境下开发了三维人脸自动建模系统。该系统对输入的人脸照片首先进行人脸检测,在检测到的区域进行人脸关键特征提取,并根据检测到的特征点的几何信息对CANDIDE-3模型进行整体和局部调整,得到个性化的三维几何人脸,最后从人脸图像上获取面部纹理信息并得到真实感的三维人脸。 相似文献
11.
Images with human faces comprise an essential part in the imaging realm. Occlusion or damage in facial portions will bring a remarkable discomfort and information loss. We propose an algorithm that can repair occluded or damaged facial images automatically, named ‘facial image inpainting＇. Inpainting is a set of image processing methods to recover missing image portions. We extend the image inpainting methods by introducing facial domain knowledge. With the support of a face database, our approach propagates structural information, i.e., feature points and edge maps, from similar faces to the missing facial regions. Using the interred structural information as guidance, an exemplar-based image inpainting algorithm is employed to copy patches in the same face from the source portion to the missing portion. This newly proposed concept of facial image inpainting outperforms the traditional inpainting methods by propagating the facial shapes from a face database, and avoids the problem of variations in imaging conditions from different images by inferring colors and textures from the same face image. Our system produces seamless faces that are hardly seen drawbacks. 相似文献
12.
The effect of stimulus rotation was assessed in four Guinea baboons (Papio papio), using pictures of familiar human faces presented in a computerized go/no-go task. In Experiment 1, 2 baboons were initially trained to discriminate upright faces, and 2 others were trained to discriminate upside-down faces. For the two groups, postlearning discrimination was impaired when the training faces were rotated 180°. In Experiment 2, upright and upside-down priming faces appeared prior to the display of target faces. For the two groups, response times were faster when the prime and the target faces had the same orientations than when they were depicted under different orientations. Finally, Experiments 3 and 4 identified variations in facial contours as the most salient discriminative cue controlling performance in 2 baboons. Altogether, our results provide no evidence that the baboons processed the pictures as representations of faces. It is suggested that the effect of rotation derived from the encoding of the pictorial faces as meaningless mono-oriented shapes, rather than as natural human faces. 相似文献
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吴旋涛 《广东轻工职业技术学院学报》2014,(2):7-10
分析了电力行业的运营状况,设计了基于地理信息系统的电力管理信息系统的功能和数据库结构,满足常规制图的输入、编辑、分析和输出等功能,并以关系——面向对象作为数据库结构,有利于三维模拟子系统的实现,可行性高,具有良好的应用前景。 相似文献
15.
WANG Yu-shun ZHUANG Yue-ting WU Fei 《浙江大学学报(A卷英文版)》2006,7(4):556-563
INTRODUCTION Realistic facial animation is highly important in the computer graphics field as it is an essential facility for human-computer interface and virtual reality and is also a difficult task because there are so many non-rigid motions besides rigid motion of heads as expression changes. Instead of modelling all the complicated facial motions, data-driven facial ani- mation just exploits facial motion data captured in real scenes. Most motion capture systems rely upon the placement… 相似文献
16.
现代编辑知识结构研究 总被引：2，自引：0，他引：2
史庆华 《辽宁师范大学学报(社会科学版)》2002,25(1):56-58
编辑的知识结构是关系到编辑学研究，编辑素质及编辑事业发展等方面的重要问题，现代化，数字化的当代社会需要编辑不断地调整，优化知识结构，从而提高编辑素质，优化编辑队伍，只有这样，才能适应现代化出版事业对编辑人员的基本要求，编辑知识结构研究应该同编辑学研究，编辑实践研究，学科编辑专业研究，编辑与现代研究结合起来。 相似文献
17.
疲劳驾驶是导致交通事故的重要原因之一。为检测识别驾驶疲劳状态,根据人的眼动行为存在随机性及模糊性特点,采用不确定性的云模型对眼动特征进行数据处理,构建二维多规则推理生成器检测驾驶员疲劳状况,以此疲劳检测模型为基础构建基于安卓的疲劳预警系统。系统通过手机摄像头实时采集驾驶员面部数据,通过人脸人眼定位后,计算出 per-clos 和眨眼时间均值。将数据输入疲劳检测模块,一旦检测到驾驶员疲劳,系统即进行文字和语音提醒。该系统成本较低,实时性较好,在模拟驾驶环境下检测率可达到 73.98%。 相似文献
18.
Xinyi LI Bing SUN Hongrun QIAN Jinrong MA Magdalena PAOLINO Zhiying ZHANG 《Journal of Zhejiang University. Science. B》2022,23(2):141
Clustered regulatory interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 nuclease (Cas9), the third-generation genome editing tool, has been favored because of its high efficiency and clear system composition. In this technology, the introduced double-strand breaks (DSBs) are mainly repaired by non-homologous end joining (NHEJ) or homology-directed repair (HDR) pathways. The high-fidelity HDR pathway is used for genome modification, which can introduce artificially controllable insertions, deletions, or substitutions carried by the donor templates. Although high-level knock-out can be easily achieved by NHEJ, accurate HDR-mediated knock-in remains a technical challenge. In most circumstances, although both alleles are broken by endonucleases, only one can be repaired by HDR, and the other one is usually recombined by NHEJ. For gene function studies or disease model establishment, biallelic editing to generate homozygous cell lines and homozygotes is needed to ensure consistent phenotypes. Thus, there is an urgent need for an efficient biallelic editing system. Here, we developed three pairs of integrated selection systems, where each of the two selection cassettes contained one drug-screening gene and one fluorescent marker. Flanked by homologous arms containing the mutated sequences, the selection cassettes were integrated into the target site, mediated by CRISPR/Cas9-induced HDR. Positively targeted cell clones were massively enriched by fluorescent microscopy after screening for drug resistance. We tested this novel method on the amyloid precursor protein (APP) and presenilin 1 (PSEN1) loci and demonstrated up to 82.0% biallelic editing efficiency after optimization. Our results indicate that this strategy can provide a new efficient approach for biallelic editing and lay a foundation for establishment of an easier and more efficient disease model. 相似文献
19.
Masten CL Guyer AE Hodgdon HB McClure EB Charney DS Ernst M Kaufman J Pine DS Monk CS 《Child abuse & neglect》2008,32(1):139-153
OBJECTIVE: The purpose of this study is to examine processing of facial emotions in a sample of maltreated children showing high rates of post-traumatic stress disorder (PTSD). Maltreatment during childhood has been associated independently with both atypical processing of emotion and the development of PTSD. However, research has provided little evidence indicating how high rates of PTSD might relate to maltreated children's processing of emotions. METHOD: Participants' reaction time and labeling of emotions were measured using a morphed facial emotion identification task. Participants included a diverse sample of maltreated children with and without PTSD and controls ranging in age from 8 to 15 years. Maltreated children had been removed from their homes and placed in state custody following experiences of maltreatment. Diagnoses of PTSD and other disorders were determined through combination of parent, child, and teacher reports. RESULTS: Maltreated children displayed faster reaction times than controls when labeling emotional facial expressions, and this result was most pronounced for fearful faces. Relative to children who were not maltreated, maltreated children both with and without PTSD showed enhanced response times when identifying fearful faces. There was no group difference in labeling of emotions when identifying different facial emotions. CONCLUSIONS: Maltreated children show heightened ability to identify fearful faces, evidenced by faster reaction times relative to controls. This association between maltreatment and atypical processing of emotion is independent of PTSD diagnosis. 相似文献