Second-order optic flow processing
نویسندگان
چکیده
منابع مشابه
Second-order optic flow processing
Optic flow-large-field rotational and radial motion-is processed as efficiently as translational motion for first-order (luminance-defined) stimuli. However, it has been suggested recently that the same pattern does not hold for second-order (e.g. contrast-defined) stimuli. We used random dot kinematogram (RDK) stimuli to determine whether global processing of optic flow is as efficient as proc...
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In this paper we present a variational approach to accurately estimate the motion vector field in a image sequence introducing a second order Taylor expansion of the flow in the energy function to be minimized. This feature allows us to simultaneously obtain, in addition, an estimation of the partial derivatives of the motion vector field. The performance of our approach is illustrated with the...
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PURPOSE Amblyopic observers show deficits for global motion discrimination that cannot be accounted for by their contrast sensitivity impairment. The processing of first- and second-order translational global motion is deficient, as is the processing of first-order optic flow, suggesting that cortical function in extrastriate areas is impaired. The authors sought to determine whether amblyopes ...
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Time to contact can be approximated from the divergence of the ow eld. Direct diierentiation of a measured ow eld is not feasible in practice because of the ill-posedness of diierentiation. We propose a group theoretical framework for direct determination of higher order ow elds. The basis is the invariance of the power spectrum of the Fourier transform to translations. By change of coordinate-...
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ژورنال
عنوان ژورنال: Vision Research
سال: 2007
ISSN: 0042-6989
DOI: 10.1016/j.visres.2007.02.022