US 2012/0057023 A1Published application

Distance measurement system and method

AssigneePixart Imaging Inc.

InventorsSHU-SIAN YANG, Ren-Hau Gu, Hsin-Chia Chen, Sen-Huang Huang

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Abstract

A distance measurement method comprising: projecting a light beam having a speckle pattern to at least one reference plane to show a plurality of images with the speckle pattern on the at least one reference plane. The speckle pattern has a plurality of speckles, so as to capture the image with the speckle pattern on the reference plane to obtain a plurality of reference image information. When the object enters the area illuminated by a light source module, an image with the speckle pattern on a surface of an object is captured to obtain an object image information. Then, a plurality of brightness relationships among each of the speckles with adjacent speckles rounding each speckle are computed according to the reference image and the object image information to obtain relative brightness information of each speckle, which is used to compute position of the object.

Claims5

Dependent claims

A distance measurement system, comprising:

at least one reference plane;
a light source module, providing a light beam having a speckle pattern to the at least one reference plane and an object, so as to show a plurality of images having the speckle pattern on the at least one reference plane and a surface of the object, wherein the speckle pattern has a plurality of speckles;
an image capture device, capturing the image shown on the reference plane to perform a reference image information, and capturing the image shown on the surface of the object to perform an object image information;
and
a processing module, coupled to the image capture device for obtaining the reference image information and the object image information, and calculating a plurality of brightness relationships between each of the speckles and adjacent speckles rounding each speckle in the reference image information and the object image information to obtain a relative brightness information of each of the speckles, so as to calculate the position of the object according to the relative brightness information.

2 more elements

Dependencies are inferred from the claim text.