Method for acquiring phase position of fast bright reflection surface on basis of color stripe permutation projection
A surface phase and color fringe technology, which is applied to measuring devices, instruments, and optical devices, etc., can solve the problem that the phase calculation cannot be completed in three-dimensional topography, and achieve the effect of high speed, speed and reliability, and low cost
Active Publication Date: 2014-12-31
BEIHANG UNIV
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[0005] The purpose of the present invention is to provide a fast phase acquisition method for strongly reflective surfaces based on the combined projection of color fringes, so as to overcome the problem that the existing non-contact optical active three-dimensional measurement method cannot complete the phase calculation when measuring the three-dimensional topography of strongly reflective surfaces
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[0030] See figure 1 , the present invention is based on a color fringe combined projection fast strong reflection surface phase solution method, characterized in that: comprising the following steps:
[0031] (1) Set exposure array T={T i},i=1,2,...,n;
[0032] Wherein, the exposure array T includes a plurality of exposure times, totaling n, arranged in order from short to long.
[0033] (2) Use a projector to project red, green, and blue monochromatic lights with grayscale values of A+B;
[0034] Wherein, the gray value A+B mentioned above generally ranges from 0 to 255 for common commercial projection equipment.
[0035] (3) Adjust the camera exposure time so that it is at T i ,i=1,...,n exposure time respectively shoot the red, green and blue monochromatic light projected by the projector, and obtain the monochromatic image array PR={PR i},i=1,2,...,n, PG={PG i},i=1,2,...,n, PB={PB i},i=1,2,...,n;
[0036](4) Use a projector to project red, green, and blue monochr...
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A method for acquiring phase position of a fast bright reflection surface on the basis of color stripe permutation projection comprises thirteen steps. The traditional three-dimensional shape stereoscopic vision detection method based on the sine stripe permutation comprises the steps of stripe permutation, image capture, phase position calculating, phase position and three-dimensional recurrence; and according to the phase position acquisition method of the fast bright reflection surface based on the color stripe permutation projection, in the stripe permutation process, aiming at problems of different reflection rates of different areas of an detected object, colored lights are projected after being combined by virtue of the characteristic that lights in different colors are different in brightness, meanwhile, in the image capture process, different camera times of exposure are adopted to effectively overcome the problem that stripe images captured by the camera are saturated or the stripe images are too dark because of the bright reflection surface, and the effective acquisition of the phase positions in the stereoscopic vision detection processes of the bright reflection surfaces such as metal and the like can be realized. The method has the characteristics of speediness, simplicity and high reliability, and can be used for optical noncontact measurement of the three-dimensional shapes of the bright reflection surfaces such as metal.
Description
technical field [0001] The invention relates to a fast phase acquisition method for strongly reflective surfaces based on combined projection of color fringes. The method can effectively solve the problem of phase acquisition failure of a large number of points when objects with strongly reflective surfaces are subjected to three-dimensional shape measurement, and can be used for strongly reflective surfaces such as metals. The high-precision three-dimensional shape measurement can also be used for the three-dimensional shape measurement of the surface of the object whose reflectivity changes greatly. The invention belongs to the technical field of optical three-dimensional measurement. Background technique [0002] As a typical non-contact optical active 3D measurement method, the stereo vision detection method based on sinusoidal fringe projection is widely used in many fields such as 3D shape measurement, reverse engineering and quality inspection. However, this active v...
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IPC IPC(8): G01B11/24
Inventor 赵慧洁梁宵月姜宏志
Owner BEIHANG UNIV