Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001最新文献_第10页

Sequential Monte Carlo fusion of sound and vision for speaker tracking 顺序蒙特卡罗融合的声音和视觉扬声器跟踪

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937600

J. Vermaak, Michel Gangnet, A. Blake, P. Pérez

引用次数: 130

Towards real-time multi-modality 3-D medical image registration 面向实时多模态三维医学图像配准

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937595

T. Netsch, P. Rösch, A. V. Muiswinkel, J. Weese

{"title":"Towards real-time multi-modality 3-D medical image registration","authors":"T. Netsch, P. Rösch, A. V. Muiswinkel, J. Weese","doi":"10.1109/ICCV.2001.937595","DOIUrl":"https://doi.org/10.1109/ICCV.2001.937595","url":null,"abstract":"Intensity value-based registration is a widely used technique for the spatial alignment of medical images. Generally, the registration transformation is determined by iteratively optimizing a similarity measure calculated from the grey values of both images. However, such algorithms may have high computational costs, especially in the case of multi-modality registration, which makes their integration into systems difficult. At present, registration based on mutual information (MI) still requires computation times of the order of several minutes. In this contribution we focus on a new similarity measure based on local correlation (LC) which is well-suited for numerical optimization. We show that LC can be formulated as a least-squares criterion which allows the use of dedicated methods. Thus, it is possible to register MR neuro perfusion time-series (128/sup 2//spl times/30 voxel, 40 images) on a moderate workstation in real-time: the registration of an image takes about 500 ms and is therefore several times faster than image acquisition time. For the registration of CT-MR images (512/sup 2//spl times/87 CT 256/sup 2//spl times/128 MR) a multiresolution framework is used. On top of the decomposition, which requires 47 s of computation time, the optimization with an algorithm based on Ml previously described in the literature takes 97 s. In contrast, the proposed approach only takes 13 s, corresponding to a speedup about a factor of 7. Furthermore, we demonstrate that the superior computational performance of LC is not gained at the expense of accuracy. In particular experiments with dual contrast MR images providing ground truth for the registration show a comparable sub-voxel accuracy of LC and MI similarity.","PeriodicalId":429441,"journal":{"name":"Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128734750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 64

Tele-graffiti: a pen and paper-based remote sketching system 远程涂鸦:一种基于纸和笔的远程素描系统

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937712

Naoya Takao, Jianbo Shi, S. Baker, I. Matthews, Bart C. Nabbe

引用次数: 15

Probabilistic learning and modelling of object dynamics for tracking 跟踪目标动力学的概率学习与建模

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937580

T. Tay, K. Sung

引用次数: 4

On cosine-fourth and vignetting effects in real lenses 真实透镜中的余弦四次方和渐晕效应

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937554

Manoj Aggarwal, H. Hua, N. Ahuja

{"title":"On cosine-fourth and vignetting effects in real lenses","authors":"Manoj Aggarwal, H. Hua, N. Ahuja","doi":"10.1109/ICCV.2001.937554","DOIUrl":"https://doi.org/10.1109/ICCV.2001.937554","url":null,"abstract":"This paper has been prompted by observations of disparities between the observed fall-off in irradiance for off-axis points and that accounted for by the cosine-fourth and vignetting effects. A closer examination of the image formation process for real lenses revealed that even in the absence of vignetting a point light source does not uniformly illuminate the aperture, an effect known as pupil aberration. For example, we found the variation for a 16 mm lens to be as large as 31% for a field angle of 10/spl deg/. In this paper, we critically evaluate the roles of cosine-fourth and vignetting effects and demonstrate the significance of the pupil aberration on the fall-off in irradiance away from image center. The pupil aberration effect strongly depends on the aperture size and shape and this dependence has been demonstrated through two sets of experiments with three real lenses. The effect of pupil aberration is thus a third important cause of fall in irradiance away from the image center in addition to the familiar cosine-fourth and vignetting effects, that must be taken into account in applications that rely heavily on photometric variation such as shape from shading and mosaicing.","PeriodicalId":429441,"journal":{"name":"Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126250088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 56

Example-based facial sketch generation with non-parametric sampling 基于实例的非参数采样面部素描生成

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937657

Hong Chen, Ying-Qing Xu, H. Shum, Song-Chun Zhu, Nanning Zheng

引用次数: 150

Human tracking with mixtures of trees 人类用混合的树木跟踪

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937589

Sergey Ioffe, D. Forsyth

引用次数: 141

Stereo matching by compact windows via minimum ratio cycle 通过最小比率循环紧凑窗口的立体匹配

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937563

O. Veksler

引用次数: 98

Structure and motion from silhouettes 轮廓的结构和运动

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937627

Kwan-Yee Kenneth Wong, R. Cipolla

引用次数: 163

Depth from defocus in presence of partial self occlusion 局部自遮挡时离焦深度

Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001 Pub Date : 2001-07-07 DOI: 10.1109/ICCV.2001.937556

S. Bhasin, S. Chaudhuri

引用次数: 40