Image interpretation by a single bottom-up top-down cycle
Image interpretation by a single bottom-up top-down cycle
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DOI：
10.1073/pnas.0800968105
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发表时间：
2008-09-23
影响因子：
11.1
通讯作者：
Ullman, Shimon
中科院分区：
文献类型：
--
作者：
Epshtein, Boris;Lifshitz, Ita;Ullman, Shimon
人类视觉系统能够快速、高精度地识别物体及其组成部分。视觉皮层识别的标准模型使用前馈处理，其中对象的部分在完整对象之前被检测到。然而，零件本身往往是模糊的，需要事先检测和定位整个对象。我们展示了一个皮质样的层次结构如何获得识别和定位的对象和零件在多个级别几乎同时通过一个单一的前馈扫描从低到高层次，然后从高到低级别的反馈扫描区域。
The human visual system recognizes objects and their constituent parts rapidly and with high accuracy. Standard models of recognition by the visual cortex use feed-forward processing, in which an object's parts are detected before the complete object. However, parts are often ambiguous on their own and require the prior detection and localization of the entire object. We show how a cortical-like hierarchy obtains recognition and localization of objects and parts at multiple levels nearly simultaneously by a single feed-forward sweep from low to high levels of the hierarchy, followed by a feedback sweep from high- to low-level areas.