Phase extraction method of optical fiber interference fringe image based on Hilbert transform
A technology of interference fringes and optical fiber interference, which is applied in the direction of measurement optics, optical radiation measurement, and measurement devices, can solve problems such as the need to improve accuracy and speed, reduce measurement accuracy, and spectral aliasing of interference fringe images, so as to improve the accuracy of phase extraction , reduce complexity, and avoid the effect that the DC component cannot be completely filtered
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[0023] The algorithm flow of the present invention is as figure 1 As shown, firstly, the interference fringe structured light image projected by the fiber-optic interferometer based on Young's double-hole interference and the deformed interference fringe image after the height (depth) modulation of the measured object is collected by the area array camera, and then the gray scale conversion processing is performed; Then perform the first Hilbert transform through the grayscale image of the interference fringe to obtain a new image that has filtered the DC component and is orthogonal to the image before the first Hilbert transform; then performs the second Sub-Hilbert transform processing to obtain an image that is orthogonal to the first Hilbert transform image; then according to the two Hilbert transforms, the sine component and the cosine component (orthogonal relationship) are obtained respectively. Structural analysis Signal; Finally, based on the analytical signal, the phas...
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