Phase position fusion method capable of reducing influence of multi-path effect of camera
A technology of multi-path effect and fusion method, which is applied in the field of phase fusion to reduce the influence of camera multi-path effect, and can solve problems such as large three-dimensional measurement errors
Active Publication Date: 2014-06-04
SICHUAN UNIV
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[0005] In summary, the traditional phase measurement profilometry is unavoidable for the multipath effect of the camera, especially in the high-contrast area of the object surface (that is, the area with a large contrast in the texture) will produce a large three-dimensional measurement error
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[0055] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0056] like figure 1 As shown, the phase fusion method of the present invention comprises the following steps:
[0057] (1) Build a 3D measurement system, place the target within the range that the camera can capture and the range that the projector can project; if the 3D measurement system has been calibrated and has the camera parameter matrix M wc and the parameter matrix of the projector M w p , then go to step (2), if the 3D measurement system is not calibrated, first adjust the focal length of the projector, then adjust the focal length, aperture size and exposure time parameters of the camera, and then calibrate the 3D measurement system to obtain the parameters of the camera matrix M Parameter matrix for wc and projector M w p , and then go to step (2);
[0058] (2) Use the following formulas (8) and (9) to generate the sinusoidal coded picture...
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The invention discloses a phase position fusion method capable of reducing the influence of the multi-path effect of a camera. The method comprises the steps of establishing a three-dimensional measuring system and placing a target at a position capable of being captured by the camera and within the projection range of a projector; scanning the target in the X direction and in the Y direction and obtaining two phase position values fai x and fai y through calculation; converting the phase position value in the X direction to the Y direction to obtain a phase position value fai xy; calculating the reflectivity of the surface of the target by projecting an all-black picture and an all-white picture, and calculating the changing direction theta of the reflectivity of each pixel point on the surface of the target according to the reflectivity; obtaining a new phase position value fai with the phase position fusion algorithm; conducting three-dimensional reconstruction on the newly generated phase position fai. According to the phase position fusion method, phase positions obtained through scanning are repaired simply by adding different algorithms, three-dimensional reconstruction is conducted on the target through the repaired phase position values, three-dimensional information which is more accurate is obtained, and especially for a high-contrast area, the measuring error can be reduced remarkably.
Description
technical field [0001] The invention relates to a method for improving the three-dimensional measurement accuracy of an object, in particular to a phase fusion method for reducing the influence of camera multipath effects. Background technique [0002] Phase measurement profilometry is a kind of active structured light measurement, which is widely used in various fields and is famous for its rapidity and high precision. The phase measurement system mainly includes a projector, a camera and a computing unit (such as a computer). Its working principle is: the projector projects a sinusoidally encoded picture onto the surface of the scanned object, and then the camera captures the light reflected from the surface of the scanned object Information, and finally through the calculation of the computing unit, the accurate three-dimensional information of the surface of the scanned object can be obtained. [0003] In the process of capturing light information by the camera, since t...
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IPC IPC(8): G01B11/24
Inventor 刘凯许晓畅
Owner SICHUAN UNIV