Transparency and coherence in human motion perception
Transparency and coherence in human motion perception
复制标题
人类运动感知的透明度和连贯性
作者：
G. Stoner;T. Albright;V. Ramachandran
当面对运动图像时，视觉系统通常必须决定运动信号是来自单个物体还是来自多个物体。当两个独立移动的光栅叠加时，出现了这个问题的特殊情况。光栅倾向于在单一方向2（图案运动）上连贯和明确地移动，而不是独立地移动（组件运动）。在这里，我们报告说，看到图案运动的趋势非常强烈地依赖于相对于光栅的交叉点（即光栅重叠的区域）的亮度，其方式与透明的物理学密切平行。当这些区域的亮度被适当地选择时，图案运动被破坏，并被两个独立移动的透明光栅的外观所取代。观察意味着，在视觉系统中的运动检测机制必须有机会获得隐性的“知识”的物理透明性，这种知识可以用来分割成不同的对象的场景。原则上，相同的知识可以用于避免混淆阴影与真实的对象边界。
WHEN confronted with moving images, the visual system often must decide whether the motion signals arise from a single object or from multiple objects15. A special case of this problem arises when two independently moving gratings are superimposed. The gratings tend to cohere and move unambiguously in a single direction2 (pattern motion) instead of moving independently (component motion). Here we report that the tendency to see pattern motion depends very strongly on the luminance of the intersections (that is, to regions where the gratings overlap) relative to that of the gratings in a way that closely parallels the physics of transparency. When the luminance of these regions is chosen appropriately, pattern motion is destroyed and replaced by the appearance of two transparent gratings moving independently. The observations imply that motion detecting mechanisms in the visual system must have access to tacit 'knowledge' of the physics of transparency and that this knowledge can be used to segment the scene into different objects. The same knowledge could, in principle, be used to avoid confusing shadows with real object boundaries.
影响因子：
2.5
作者：
ALBRIGHT, TD
通讯作者：
ALBRIGHT, TD