Mathematical principle derivation of structured light phase shift method + multifrequency heterodyne

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The paper ： Research on 3D measurement technology and system of structured light based on digital grating projection [ Bo ]

author ： Lizhongwei Huazhong University of science and technology 2007

function ： Phase shift method ： Multifrequency heterodyne （ Triple frequency N Step phase shift method ）

01 Phase shift method

chart 1 Ideal to be written into the projector N Step phase shift fringe

Usually for Step phase shift , Generation page Fringe image （ Pictured 1 Shown ） The formula is as follows ：

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among ：

• ： Background light intensity

• ： Modulation intensity

• ： Horizontal coordinates of pixels

• ： Phase shift value

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