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标题: Video Composition using Geodesic Distance [打印本页]

作者: 彬彬 时间: 2011-12-29 09:01
标题: Video Composition using Geodesic Distance
1 Introduction

Video composition is an indispensable technique in the production

of many types of videos; nevertheless, it remains challenging problem

if the source video is normally captured without a blue or green

screen, especially when the object to be pasted between videos does

not have a clear boundary (e.g. water, gas, and fire). We will call

such a region a secondary foreground, and we propose a simple

composition method in which foreground, background, and secondary

foreground weights are determined using a geodesic distance

tramsform [Criminisi et al. 2010]. This method will run in

real time, but is nevertheless able to produce convincing results with

difficult secondary foregrounds.

2 Method

Figure 1(b) shows one of the user-defined trimaps for the source

video, which is the usual starting-point for image and video matting

processes. Let the binary masks Mf and Mb be one for foreground

and background region, respectively. We can compute the

geodesic distance transform [Criminisi et al. 2010] for each region:

Df (x) = D(x;Mf ;rI);Db(x) = D(x;Mb;rI): Figure 1(c)

shows the resulting geodesic distances Df and Db in blue and red

respectively. Intuitively, Df (x) is the distance from a point x the

boundary of the foreground, and Db(x) is the distance from x to

the boundary of the background.

The key feature of our approach is the additional secondary foreground

region. Let Pf (x), Pb(x), and Ps(x) respectively be the

probabilities that a pixel x belongs to the foreground, background,

or the secondary foreground. We can express these probabilities as

follows:

作者: 菜刀吻电线 时间: 2012-5-25 23:26
提醒猪猪，千万不能让你看见

作者: 菜刀吻电线 时间: 2012-6-7 23:19
“再次路过……”我造一个-----特别路过

作者: 菜刀吻电线 时间: 2012-6-21 23:26
很有心,部分已收录自用,谢谢

作者: C.R.CAN 时间: 2012-7-20 23:28
既来之，则看之！

作者: 菜刀吻电线 时间: 2012-7-29 23:18
好`我顶``顶顶

作者: C.R.CAN 时间: 2012-7-29 23:28
跑着去顶朋友滴铁

作者: 铁锹 时间: 2012-7-30 09:03
3D技术领衔行业应用_技术创新促进产业升级

3D全息投影让乐器也疯狂

2012国际3D魔幻艺术中国特别展杭州揭幕

我国牵头制定智能电视和3D电视国际标准

美国4D影院模拟大风爆炸等效果

什么比Kinect精确100倍？_且看体感控制系统

Unity引擎滑稽3D跑酷玩儿命跑

非同一般的新GPS系统增强现实

作者: tc 时间: 2012-8-13 11:41
我看看就走，你们聊！

作者: 晃晃 时间: 2012-9-30 23:20
很经典，很实用，学习了!

作者: 奇 时间: 2013-2-7 00:22
不错哦,谢谢楼主

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