METHOD OF ESTIMATING OPTICAL FLOW ON THE BASIS OF AN ASYNCHRONOUS LIGHT SENSOR
First Claim
1. A method for estimating optical flow, comprising:
- receiving asynchronous information originating from a light sensor having a pixel matrix arranged facing a scene, the asynchronous information comprising, for each pixel of the matrix, successive events originating from said pixel and depending on light variations in the scene;
for a place of estimation in the pixel matrix and an estimation time, selecting a set of events originating from pixels lying in a spatial neighborhood of the place of estimation and having arisen in a time interval defined with respect to the estimation time, the set having at most one event per pixel of the spatial neighborhood; and
quantizing variations in the times of occurrence of the events of the selected set as a function of positions, in the matrix, of the pixels from which said events originate.
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Abstract
A computer receives asynchronous information originating from a light sensor (10) having a pixel matrix disposed opposite a scene. The asynchronous information comprises, for each pixel of the matrix, successive events originating from this pixel and depending on variations in light in the scene. For a place of estimation (p) in the matrix of pixels and an estimation time (t), the computer selects a set (Sp t) of events originating from pixels included in a spatial neighbourhood (πρ) of the place of estimation and which have occurred in a time interval (Θ) defined with respect to the estimation time, such that this set has at most one event per pixel of the spatial neighbourhood. The computer quantifies the variations in the times of occurrence of the events of the set selected as a function of the positions, in the matrix, of the pixels from which these events originate.
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Citations
14 Claims
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1. A method for estimating optical flow, comprising:
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receiving asynchronous information originating from a light sensor having a pixel matrix arranged facing a scene, the asynchronous information comprising, for each pixel of the matrix, successive events originating from said pixel and depending on light variations in the scene; for a place of estimation in the pixel matrix and an estimation time, selecting a set of events originating from pixels lying in a spatial neighborhood of the place of estimation and having arisen in a time interval defined with respect to the estimation time, the set having at most one event per pixel of the spatial neighborhood; and quantizing variations in the times of occurrence of the events of the selected set as a function of positions, in the matrix, of the pixels from which said events originate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for estimating optical flow, comprising:
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a light sensor having a pixel matrix to be arranged facing a scene and adapted to output asynchronous information comprising, for each pixel of the matrix, successive events originating from said pixel and depending on light variations in the scene; and a computer to execute the following steps for a place of estimation in the pixel matrix and an estimation time; selecting a set of events originating from pixels lying in a spatial neighborhood of the place of estimation and having arisen in a time interval defined with respect to the estimation time, the set having at most one event per pixel of the spatial neighborhood; and quantizing variations in the times of occurrence of the events of the selected set as a function of positions, in the matrix, of the pixels from which said events originate.
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Specification