Estimating 3D tilt from local image cues in natural scenes.
Estimating 3D tilt from local image cues in natural scenes.
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DOI：
10.1167/16.13.2
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发表时间：
2016-10-01
影响因子：
1.8
通讯作者：
Geisler WS
中科院分区：
文献类型：
--
作者：
Burge J;McCann BC;Geisler WS
估计三维（3D）表面取向（倾斜和倾斜）是朝向估计3D形状的重要的第一步。在这里，我们研究如何从同一位置（视差梯度，亮度梯度和主要纹理方向）的三个本地图像线索应结合起来，以估计自然场景中的3D倾斜。我们收集了一个自然立体图像数据库，其中精确配准的距离图像提供了每个像素位置的地面真实距离。然后，我们分析了地面实况倾斜和图像线索值之间的关系。我们的分析是免费的联合概率分布的假设，并产生贝叶斯最优估计的倾斜，给定的线索值。丰富的结果出现：（a）典型的倾斜估计仅是中等准确的，并且受到先验概率分布中的基数偏差的强烈影响;（B）当线索值相似时，或者当倾斜大于40°时，估计基本上更准确;（c）当亮度和纹理线索一致时，它们通常否决视差线索，并且当它们不一致时，它们几乎没有影响;以及（d）简化线索组合文献中常见的假设通常对于估计自然场景中的倾斜是合理的。倾斜估计通常不是非常准确的事实与观看小块自然场景的主观印象一致。事实上，估计是更准确的图像位置的一个子集也与主观印象和假设，即感知表面取向，在更全球的规模，是通过插值或外推在关键位置的估计实现的。
Estimating three-dimensional (3D) surface orientation (slant and tilt) is an important first step toward estimating 3D shape. Here, we examine how three local image cues from the same location (disparity gradient, luminance gradient, and dominant texture orientation) should be combined to estimate 3D tilt in natural scenes. We collected a database of natural stereoscopic images with precisely co-registered range images that provide the ground-truth distance at each pixel location. We then analyzed the relationship between ground-truth tilt and image cue values. Our analysis is free of assumptions about the joint probability distributions and yields the Bayes optimal estimates of tilt, given the cue values. Rich results emerge: (a) typical tilt estimates are only moderately accurate and strongly influenced by the cardinal bias in the prior probability distribution; (b) when cue values are similar, or when slant is greater than 40°, estimates are substantially more accurate; (c) when luminance and texture cues agree, they often veto the disparity cue, and when they disagree, they have little effect; and (d) simplifying assumptions common in the cue combination literature is often justified for estimating tilt in natural scenes. The fact that tilt estimates are typically not very accurate is consistent with subjective impressions from viewing small patches of natural scene. The fact that estimates are substantially more accurate for a subset of image locations is also consistent with subjective impressions and with the hypothesis that perceived surface orientation, at more global scales, is achieved by interpolation or extrapolation from estimates at key locations.
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影响因子：
16.6
作者：
Burge, Johannes;Geisler, Wilson S.
通讯作者：
Geisler, Wilson S.
DOI：
10.1073/pnas.1108491108
发表时间：
2011-10-04
影响因子：
11.1
作者：
Burge, Johannes;Geisler, Wilson S.
通讯作者：
Geisler, Wilson S.
影响因子：
1.8
作者：
Fleming, RW;Torralba, A;Adelson, EH
通讯作者：
Adelson, EH
影响因子：
19.5
作者：
Massot, Corentin;Herault, Jeanny
通讯作者：
Herault, Jeanny
影响因子：
1.8
作者：
Knill, DC;Saunders, JA
通讯作者：
Saunders, JA