DISTANCE MEASURING METHOD, DISTANCE MEASURING SYSTEM AND PROCESSING SOFTWARE THEREOF

摘要

A distance measuring system includes a light source module, an image capturing device and a processing module. The light source module transmits a light beam having a speckle pattern to a first flat surface and a second flat surface, and an object. The image capturing device captures the image of the speckle pattern shown on the first and second flat surfaces, and captures the image of the speckle pattern shown on a surface of the object to produce first reference image information, second reference image information, and object image information. The processing module calculates a displacement vector of the speckle pattern according to the first and second reference image information. The processing module calculates the relative distance between the object and the first flat surface or the second flat surface according to the position of the speckle pattern on the object image information and the displacement vector.

主权项

1. A distance measuring system, comprising:
a light source module, configured for transmitting a light beam having a speckle pattern to a first flat surface and a second flat surface, so as to show the speckle pattern on the first flat surface and the second flat surface, wherein the speckle pattern has a plurality of speckles; an image capturing device, configured for capturing a plurality of images of the speckle pattern shown on the first flat surface and the second flat surface to produce first reference image information and second reference image information, and of the speckle pattern shown on an object when the light beam is transmitted to the object, wherein the image capturing device captures the image of the speckle pattern shown on the surface of the object to produce object image information; and a processing module, configured for obtaining the first reference image information and the second reference image information, and calculating a displacement vector of the speckle pattern shown on the first reference image information and the second reference image information, and the processing module comparing the object image information with one of the first reference image information and the second reference image information to obtain displacement information of the speckle pattern shown on the object image information, so as to calculate a relative distance between the object and the first flat surface or the second flat surface according to the displacement vector and the displacement information, wherein displacement of the speckle pattern depends on a plurality of surrounding images and a sum of absolute difference (SAD) of each one of a plurality of possible positions, a minimum SAD is considered to be the displacement vector.