Method for realizing Fourier transfrom contour by generating pi phase shift by two-colour grating template
A two-color light and template technology, which is applied in the field of optical three-dimensional sensing, can solve the problems of limiting the application of Fourier transform profilometry, affecting the real-time performance of Fourier transform profilometry, and long time, so as to achieve simple structure and reduce spectral confusion. stacking, easy-to-use effects
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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings, working principles and embodiments.
[0031] The two-color grating template for realizing π phase shift consists of two groups of fringes with two different colors, the optical transmittance is sinusoidally distributed, and they move half a period from each other. For example, we use red, green, and yellow (R, G, B) three primary colors to form a two-color grating. The transmittance function of this grating is expressed as:
[0032] f(x,y)=a r +b r cos(2πf 0 x)+a g +b g cos(2πf 0 x+π) (1)
[0033] a r and a g are the red and green DC components of the two-color grating, b r and b g for contrast. When making a raster use a r =a g , b r =b g .
[0034] When the two-color grating fringe pattern is projected on the surface of the object to be measured, in the direction forming a certain angle with the projection optical axis, the color image obtai...
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