A method and system for acquiring three-dimensional information
A technology of three-dimensional information and acquisition method, which is applied in the direction of measuring devices, instruments, and optical devices, etc., which can solve problems such as the inability to obtain three-dimensional images, restrict the application and development of stereo camera technology, and the inability of stereo camera systems to process three-dimensional information.
Active Publication Date: 2016-01-13
NANKAI UNIV
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The stereo camera system is currently widely used to obtain 3D images. In 3D imaging technology, the object to be photographed is usually an object with a certain stereo depth, and the depth of field of the stereo camera system is determined by the depth of field of the camera device itself. If it is The stereo depth of the captured object exceeds the depth of field of the camera device, which will cause the stereo camera system to be unable to process the 3D information beyond the depth of field, so that the 3D image cannot be obtained. At the same time, this defect of stereo camera technology also restricts the application of stereo camera technology and development
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[0103] Figure 4 is a schematic diagram of the point spread function of the imaging system in the present invention, such as Figure 4 As shown, in the imaging system, the maximum phase difference of one-half of the cubic phase template is a=250π, the focal length of the lens is f=60mm, the clear aperture D=10mm, and the quasi-focus object distance z 0 =180mm, the quasi-focus object distance refers to the position where the object is most clearly imaged; Figure 4 (a) is a schematic diagram of the point spread function of the cubic phase template before rotating 180 degrees, Figure 4 (b) is a schematic diagram of the point spread function of the cubic phase template after rotating 180 degrees, Figure 4 In , the point spread function from left to right corresponds to the object distance including the defocus amount: z 0 =140mm, z 0 =160mm, z 0 =180mm,z 0= 200mm and z 0 =220mm; if Figure 4 As shown, with the increase of the defocus amount (that is, the distance betwee...
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The invention provides an acquisition method for three-dimensional information. The method comprises the following steps of obtaining the first image point of an object through a cubic phase template; obtaining the second image point of the object through the cubic phase template which rotates around a light path at 180 degrees; obtaining a corresponding point distance according to the first image point and the second image point; obtaining an object distance corresponding to the corresponding point distance according to preset corresponding relationship of the object distance and the corresponding point distance; obtaining the position information of an ideal image point according to the first image point and the second image point; obtaining the three-dimensional information of the object according to the position information of the object distance and the ideal image point. The invention further provides an acquisition system for the three-dimensional information. According to the technical scheme provided by the invention, the simple and convenient acquisition of three-dimensional information of the object is realized.
Description
【Technical field】 [0001] The invention relates to three-dimensional imaging technology, in particular to a method and system for acquiring three-dimensional information. 【Background technique】 [0002] At present, 3D imaging technology has a wide range of application prospects, such as detecting the surface structure of objects, measuring the 3D shape of biological tissues, and photographing 3D scenes. The stereo camera system is currently widely used to obtain 3D images. In 3D imaging technology, the object to be photographed is usually an object with a certain stereo depth, and the depth of field of the stereo camera system is determined by the depth of field of the camera device itself. If it is The stereo depth of the captured object exceeds the depth of field of the camera device, which will cause the stereo camera system to be unable to process the 3D information beyond the depth of field, so that the 3D image cannot be obtained. At the same time, this defect of stereo...
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IPC IPC(8): G01B11/24
Inventor 杨勇袁小聪申诗倩
Owner NANKAI UNIV