Time-to-Contact from Photometric Information
نویسندگان
چکیده
منابع مشابه
Coarse-grained information dominates fine-grained information in judgments of time-to-contact from retinal flow
To investigate the relative importance of fine- and coarse-grained structure in the analysis of retinal flow, subjects made estimates of time-to-contact from random dot kinematograms depicting movement towards a flat, sparsely textured surface. Individual display elements moved smoothly away from each other while expanding smoothly in size. By artificially manipulating the rate at which the ind...
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This paper presents a method to derive estimates of contact properties for the case of a planar robot interacting with unknown objects by means of propri-oceptive information (joint angles and torques). In a rst stage, two kinematic observations, based on the instantaneous velocities and the displacement between two consecutive postures, are used to obtain an estimate of the location with an as...
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Four experiments examined how the visual system deals with multiple information sources for perceiving dynamic events. Two tau-type optical variables, one defined by the expanding object's image and the other defined by the expanding angular extent composed of the line of sight and the object's shadow, were manipulated in time-to-contact judgments. When the information specified by both variabl...
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Zusammenfassung. Robust time-to-contact (TTC) calculation belongs to the most desirable techniques in the field of autonomous robot navigation. Using only image measurements it provides a method to determine when contact with a visible object will be made. However TTC computation by using feature positions in the last two images only, is very sensitive to noisy measurements and provides very un...
متن کاملThe time course of estimating time-to-contact: Switching between sources of information
The different sources of information that can be used to estimate time-to-contact may have different degrees of reliability across time. For example, after a given presentation or display time, an absolute change of angular size can be more reliable than the corresponding estimation of the rate of angular expansion (e.g. motion information). One could then expect systematic biases in the observ...
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ژورنال
عنوان ژورنال: IPSJ Transactions on Computer Vision and Applications
سال: 2014
ISSN: 1882-6695
DOI: 10.2197/ipsjtcva.6.39