Touch and motion detection using surface map, object shadow and a single camera

A technology for mapping graphs and objects, applied in the field of methods and systems, to solve problems such as the inability to obtain a unique solution

Active Publication Date: 2014-05-28
HONG KONG APPLIED SCI & TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Therefore, regarding the height position of the objec

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  • Touch and motion detection using surface map, object shadow and a single camera
  • Touch and motion detection using surface map, object shadow and a single camera
  • Touch and motion detection using surface map, object shadow and a single camera

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[0028] As used herein, "a reference vertical direction" and "a reference horizontal direction" are defined as two mutually perpendicular and orthogonal directions, but these two directions are not defined with respect to the direction of gravity. Assuming that the reference plane is flat, a reference vertical direction is defined as a direction perpendicular to said reference plane, and a reference horizontal direction is defined relative to said reference vertical direction. For example, the reference plane can be a floor surface or a wall. If the datum is not flat, an imaginary plane representing the datum is used instead of the original datum to define the datum vertical. That is, if the reference plane is not flat, the reference vertical direction is defined at this time as the direction perpendicular to the imaginary plane.

[0029] As used in this specification and the appended claims, the "height of an object above a reference plane" is defined as the distance from a p...

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Abstract

The present invention provides an optical method and a system for obtaining positional and/or motional information of an object with respect to a reference surface, including detecting if the object touches the reference surface, by using a projector and one camera. A surface map is used for mapping a location on the reference surface and a corresponding location in a camera-captured image having a view of the reference surface. In particular, a camera-observed shadow length, i.e. a length of the object's shadow observable by the camera, estimated by using the surface map, is used to compute the object's height above the reference surface (a Z coordinate). Whether or not the object touches the reference surface is also obtainable. After an XY coordinate is estimated, a 3D coordinate of the object is obtained. By computing a time sequence of 3D coordinates, the motional information, such as velocity and acceleration, is obtainable.

Description

[0001] 【Related Cross Reference】 [0002] This application is a continuation-in-part of US Patent Application 13 / 474,567, filed May 17, 2012, the disclosure of which is hereby incorporated by reference in its entirety. 【Technical field】 [0003] The present invention relates to optically determining information about the position or movement of an object with respect to a reference plane, including whether the object touches the reference plane. In particular, the invention relates to a method and system using a surface map for mapping physical positions on said datum to their corresponding positions in camera images, combined with a surface map from a camera image The length of an object's projection is measured to optically determine the position or motion information of said object. 【Background technique】 [0004] Computer-based automatic detection of whether an object touches a reference plane and / or determination of the object's position information (such as spatial co...

Claims

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Application Information

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IPC IPC(8): G06T7/00G03B17/54
Inventor 张玮
Owner HONG KONG APPLIED SCI & TECH RES INST
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