Method and system to determine vehicle speed
First Claim
Patent Images
1. A system comprising:
- one or more analysis processors configured to be operably disposed onboard a vehicle and configured to receive image data of a field of view of a camera operably disposed onboard the vehicle,wherein the one or more analysis processors are further configured to;
identify at least one feature of interest of a route in the image data that moves in time across plural frames of the image data;
determine a total pixel distance by which the at least one feature of interest has moved;
determine a pixel rate of change based on the total pixel distance and a frame rate at which the image data is captured; and
determine a speed of movement of the vehicle as the vehicle is moving based on the pixel rate of change and a correlation of a unit pixel distance to a unit route distance.
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Abstract
A vehicle speed determination system and method receive image data of a field of view of a camera operably disposed onboard a vehicle. A speed and/or heading of the vehicle are determined as the vehicle is moving based at least in part on one or more differences in the image data. In one aspect, pixel intensities in different images or frames may be examined to identify one or more features of interest in the images or frames. Movement of the one or more features of interest in the images or frames is correlated to movement of the vehicle along the route, and the time difference between when the images or frames are obtained can be used to determine the vehicle speed.
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Citations
19 Claims
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1. A system comprising:
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one or more analysis processors configured to be operably disposed onboard a vehicle and configured to receive image data of a field of view of a camera operably disposed onboard the vehicle, wherein the one or more analysis processors are further configured to; identify at least one feature of interest of a route in the image data that moves in time across plural frames of the image data; determine a total pixel distance by which the at least one feature of interest has moved; determine a pixel rate of change based on the total pixel distance and a frame rate at which the image data is captured; and determine a speed of movement of the vehicle as the vehicle is moving based on the pixel rate of change and a correlation of a unit pixel distance to a unit route distance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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one or more analysis processors configured to be operably disposed onboard a vehicle and configured to receive image data of a field of view of a camera operably disposed onboard the vehicle, wherein the one or more analysis processors also are configured to determine a speed of movement of the vehicle as the vehicle is moving based at least in part on one or more differences in the image data; wherein the one or more analysis processors also are configured to determine at least one of the speed or a heading of the vehicle by identifying one or more features of interest in the image data and monitoring movement of the one or more features of interest in the image data, wherein the one or more analysis processors are configured to identify the one or more features of interest based on pixel intensities in the image data; and wherein the one or more analysis processors are configured to apply one or more convolution filters to the image data in order to identify the one or more features of interest.
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9. A method comprising:
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receiving image data of a field of view a camera operably disposed onboard a vehicle; and determining a speed of movement of the vehicle when the vehicle is moving based at least in part on one or more differences in the image data; wherein the speed is determined by; identifying at least one image feature of a route in the image data that moves in time across plural frames of the image data; determining a total pixel distance by which the at least one image feature has moved; determining a pixel rate of change based on the total pixel distance and a frame rate at which the image data is captured; and determining the speed based on the pixel rate of change and a correlation of a unit pixel distance to a unit route distance. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving image data of a field of view a camera operably disposed onboard a vehicle; determining a speed of movement of the vehicle when the vehicle is moving based at least in part on one or more differences in the image data; and identifying one or more features of interest in the image data based on pixel intensities in the image data and monitoring movement of the one or more features of interest in the image data, wherein the speed is determined based on the movement that is monitored; wherein identifying the one or more features of interest includes applying one or more convolution filters to the image data.
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17. A system comprising:
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one or more processors configured to receive images obtained at different times from a camera onboard a vehicle moving along a route, the one or more processors configured to determine a difference between the images and to determine a speed of movement of the vehicle along the route based on the difference between the images; wherein the one or more processors are configured to; identify at least one feature of interest of the route in the images; determine a total pixel distance by which the at least one feature of interest has moved between the images; determine a pixel rate of change based on the total pixel distance and a frame rate at which the images are captured by a camera; and determine the speed of the vehicle based on the pixel rate of change and a correlation of the total pixel distance to a route distance. - View Dependent Claims (18, 19)
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Specification