Distance measuring method, distance measuring system and processing software thereof

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 the displacement vector is obtained by using a sum of absolute transformed difference (SATD), an absolute transformation means transforming an absolute value by a transformation formula.

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 the displacement vector is obtained by using a sum of squared difference (SSD), the SSD is obtained by subtracting an absolute value and calculating the sum of squares.