Distance estimation in camera-based systems utilizing motion measurement and compression attributes
AssigneeXerox Corporation
InventorsStuart A. Schweid, Edgar A. Bernal
Life of this patent
Estimating the term…
Abstract
When estimating distance to an object in an image using a single camera, data acquired by an onboard accelerometer is analyzed to determine camera speed as the user takes a video of the object of interest. The compression that results during video processing is used to derive motion vectors for the object of interest in the scene. The motion vectors have an opposite direction to the camera motion and a magnitude that is a function of the unknown object distance and a known magnification level. The object distance is calculated from the estimated velocity and motion vector magnitude.
Claims23
A computer-implemented method for estimating distance to an object using motion measurement and video compression attributes derived from video captured by a single camera, comprising:
- estimating camera velocity using one or more camera motion values provided by an accelerometer associated with the camera;
- identifying frame motion vectors generated during compression of video captured by the camera;
- estimating distance to a target object from the one or more camera motion values provided by the accelerometer and motion vector information;
- and
- reporting at least one distance-to-object measurement.
A system that facilitates estimating distance to an object using motion measurement and video compression attributes derived from video captured by a single camera, comprising:
- a non-transitory computer-readable medium that stores computer-executable instructions for execution by a processor;
- and
- a processor configured to execute the instructions, the instructions comprising:
- estimating camera velocity using one or more camera motion values provided by an accelerometer associated with the camera;
- identifying frame motion vectors generated during compression of video captured by the camera;
- estimating distance to a target object from the one or more camera motion values provided by the accelerometer and motion vector information;
- and
- reporting at least one distance-to-object measurement.
A non-transitory computer-readable medium having stored thereon computer-executable instructions for estimating distance to an object using motion measurement and video compression attributes derived from video captured by a single camera, the instructions comprising:
- estimating camera velocity using one or more camera motion values provided by an accelerometer associated with the camera;
- identifying frame motion vectors generated during compression of video captured by the camera;
- estimating distance to a target object from the one or more camera motion values provided by the accelerometer and motion vector information;
- and
- reporting at least one distance-to-object measurement.
Dependencies are inferred from the claim text.