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The detection and identification of lines and edges
Vision Research, 1975Abstract The threshold for detecting the presence of a bright or dark line was compared with the threshold for being able to identify the polarity of line. The threshold for detection was only about 0.05 log units lower than the threshold for identification. A similar relation was found for the thresholds for detecting and identifying edges.
D J, Tolhurst, R S, Dealy
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Asymmetries in preattentive line detection
Vision Research, 1994We tested the relative contribution of absolute orientation and collinearity to asymmetries in preattentive line detection. Subjects reported the location of a single line that was tilted by 16 deg against the orientation of the background lines. Perceptual pop-out strength was quantified as the threshold presentation time to correctly locate the ...
Meigen, Thomas +2 more
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Analysis of the Detection of a Moving Line
Perception, 1978A model is proposed to explain the effects of line motion on visual sensitivity. The model incorporates recent evidence for parallel ‘pattern’ and ‘flicker’ systems. An element of either system consists of a spatial filter followed by a temporal filter; the characteristics of these filters were derived from previous psychophysical measurements.
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Central Catadioptric Line Detection
Procedings of the British Machine Vision Conference 2004, 2004Central catadioptric sensors enable to acquire panoramic images on a 360 degree field of view while preserving a single viewpoint. These advantages account for the growing use of these sensors in applications such as surveillance, navigation or modelling.
Pascal Vasseur, El Mustapha Mouaddib
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2006 Canadian Conference on Electrical and Computer Engineering, 2006
Detection of straight lines in an image is a fundamental requirement for many applications in computer vision. We formulate the straight line detection task as an energy minimization problem. This formulation helps the detection of lines in a global manner in contrast to the local detection methods used in conventional algorithms.
Ranga Rodrigo +2 more
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Detection of straight lines in an image is a fundamental requirement for many applications in computer vision. We formulate the straight line detection task as an energy minimization problem. This formulation helps the detection of lines in a global manner in contrast to the local detection methods used in conventional algorithms.
Ranga Rodrigo +2 more
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Road Detection Based on Off-Line and On-Line Learning
2014 IEEE International Conference on Computer and Information Technology, 2014Vision-based road detection is a key component for autonomous vehicle. Existing techniques could be roughly categorized into two categories: off-line training based algorithms and on-line learning based algorithms. While off-line training based algorithms may not adapt well to the new testing scenario, on-line learning based algorithms may not produce ...
Qi Xie +3 more
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Mathematical Models for Automatic Line Detection [PDF]
Journal of the ACM, 1973 A particular decision-theoretic approach to the problem of detecting straight edges and lines in pictures is discussed. A model is proposed of the appearance of scenes consisting of prismatic solids, taking into account blurring, noise, and smooth variations in intensity over faces.
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Detection of perpendicular line intersections
Applied Optics, 1980An automatic pattern recognition system is described which employs a digital approximation of a ring.
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A study of retrospective and on-line event detection
Proceedings of the 21st annual international ACM SIGIR conference on Research and development in information retrieval, 1998This paper investigates the use and extension of text retrieval and clustering techniques for event detection. The task is to automatically detect novel events from a temporally-ordered stream of news stories, either retrospectively or as the stories arrive.
Yiming Yang +2 more
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Line Detection by Spherical Gradient
2013This paper proposes a novel method of detecting lines from omnidirectional image based on spherical gradient of edge points. Since the spherical gradient of edge points is aligned with the normal vector of the line’s projection plane, a line can be determined directly from the spherical gradient direction of the edge points.
Shigang Li 0001 +2 more
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