منابع مشابه
Top-Down Control in Contour Grouping
Human observers tend to group oriented line segments into full contours if they follow the Gestalt rule of 'good continuation'. It is commonly assumed that contour grouping emerges automatically in early visual cortex. In contrast, recent work in animal models suggests that contour grouping requires learning and thus involves top-down control from higher brain structures. Here we explore mechan...
متن کاملQualifying Exam Contour Grouping
In this paper, I review the contour grouping approaches towards segmentation of images. Classifying the existing literature into local and global methods, I show how the grouping methods have improved over time, moving from local to global and from heuristic to probabilistic. Requirements for performance evaluation of grouping algorithms are also discussed.
متن کاملSearching for “the Top” in Top-Down Control
Although numerous theoretical models implicate the prefrontal cortex (PFC) as a source of top-down control signals, empirical support is limited. In this review, we highlight direct evidence for this view of PFC function and discuss several lines of other supportive findings. Most evidence to-date is only suggestive due to methodological challenges in tracking the spatiotemporal dynamics of cor...
متن کاملContour Grouping with Prior Models
Conventional approaches to perceptual grouping assume little specific knowledge about the object(s) of interest. However, there are many applications in which such knowledge is available and useful. Here, we address the problem of finding the bounding contour of an object in an image when some prior knowledge about the object is available. We introduce a framework for combining prior probabilis...
متن کاملEcological Statistics of Contour Grouping
The Gestalt laws of perceptual organization were originally conceived as qualitative principles, intrinsic to the brain. In this paper, we develop quantitative models for these laws based upon the statistics of natural images. In particular, we study the laws of proximity, good continuation and similarity as they relate to the perceptual organization of contours. We measure the statistical powe...
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ژورنال
عنوان ژورنال: PLoS ONE
سال: 2013
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0054085