A simple stereo algorithm to recover precise object boundaries and smooth surfaces
A simple stereo algorithm to recover precise object boundaries and smooth surfaces
复制标题
DOI：
10.1023/a:1014510328154
复制
发表时间：
2002-04-01
影响因子：
19.5
通讯作者：
Oka, S
中科院分区：
文献类型：
--
作者：
Okutomi, M;Katayama, Y;Oka, S
在基于区域的立体匹配中，为了恢复精确的目标边界，存在两个问题。其一是所谓的“遮挡问题”。如果我们可以在使用的许多摄像头中只选择“可见”摄像头，则可以避免这种情况。另一个问题称为边界越界问题，即由于窗口覆盖超出边界，导致恢复的对象边界错误地远离实际对象边界。这对于使用深度信息分割对象尤其有害。已经提出了几种方法来解决这个问题。但是，这些技术在光滑的表面上往往会降级。也就是说，在恢复精确的物体边缘和获得光滑曲面之间似乎存在一个权衡的问题，本文提出了一种新的简单的方法来解决这些问题。该方法使用多个立体对和多个窗口，检测可能发生边界越界的区域(称为BO区域)，并针对BO区域和非BO区域采用适当的方法。虽然该方法非常简单，但实验结果表明，该方法在恢复目标正确位置的尖锐边缘和平滑目标表面方面都非常有效。我们还对边界越界进行了合理的分析，这在过去并没有得到清楚的解释。
For recovering precise object boundaries in area-based stereo matching, there are two problems. One is the so-called "occlusion problem". This can be avoided if we can select only "visible" cameras among many cameras used. Another one is the problem called "boundary overreach", i.e. the recovered object boundary turns out to be wrongly located away from the real one due to the window's coverage beyond a boundary. This is especially harmful to segmenting objects using depth information. A few approaches have been proposed to solve this problem. However, these techniques tend to degrade on smooth surfaces. That is, there seems to be a trade-off problem between recovering precise object edges and obtaining smooth surfaces.In this paper, we propose a new simple method to solve these problems. Using multiple stereo pairs and multiple windowing, our method detects the region where the boundary overreach is likely to occur (let us call it "BO region") and adopts appropriate methods for the BO and non-BO regions. Although the proposed method is quite simple, the experimental results have shown that it is very effective at recovering both sharp object edges at their correct locations and smooth object surfaces. We also present a sound analysis of the boundary overreach which has not been clearly explained in the past.