A moving observer in a three-dimensional world.
A moving observer in a three-dimensional world.
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DOI：
10.1098/rstb.2015.0265
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发表时间：
2016-06-19
期刊：
影响因子：
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通讯作者：
Glennerster A
中科院分区：
文献类型：
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作者：
Glennerster A
对于许多任务，例如检索以前查看过的对象，观察者必须在一个位置形成世界的表示并在另一个位置使用它。根据视觉信息构建的基于世界的三维场景重建将满足这一要求，计算机视觉现在可以以极快的速度和准确性实现这一点。然而，我认为大脑这样做既不容易也没有必要。我讨论了生物学上可行的替代方案，包括避免三维坐标系的可能性，例如以自我为中心和基于世界的表示。例如，表面的距离、倾斜度和局部形状决定了当观察者的视角变化（通过移动或双眼观察）时视觉特征在图像中相对于彼此移动的倾向。无需三维参考系即可存储此类倾向。我认为，面对持续的头部和眼睛运动来表示稳定场景的问题是理解三维视觉目标的适当起点，比静态双目观察者的情况更是如此。本文是主题“三维世界中的愿景”的一部分。
For many tasks such as retrieving a previously viewed object, an observer must form a representation of the world at one location and use it at another. A world-based three-dimensional reconstruction of the scene built up from visual information would fulfil this requirement, something computer vision now achieves with great speed and accuracy. However, I argue that it is neither easy nor necessary for the brain to do this. I discuss biologically plausible alternatives, including the possibility of avoiding three-dimensional coordinate frames such as ego-centric and world-based representations. For example, the distance, slant and local shape of surfaces dictate the propensity of visual features to move in the image with respect to one another as the observer's perspective changes (through movement or binocular viewing). Such propensities can be stored without the need for three-dimensional reference frames. The problem of representing a stable scene in the face of continual head and eye movements is an appropriate starting place for understanding the goal of three-dimensional vision, more so, I argue, than the case of a static binocular observer. This article is part of the themed issue ‘Vision in our three-dimensional world’.