The invention discloses a holographic method for generating controllable three-dimensional axial
structured light, which comprises the following steps of: generating three-dimensional axial
structured light intensity maps and depth maps of different periods and phases through a computer,
processing the three-dimensional axial
structured light intensity maps and depth maps by the computer to obtain slice
layers, and obtaining propagation from an object plane to a holographic plane by using an S-FFT (
Fast Fourier Transform)
algorithm by virtue of a
Fresnel diffraction principle; adding the complex amplitudes of all the slice
layers to obtain a hologram, extracting phase distribution from the
complex amplitude distribution of the hologram to obtain a phase
distribution diagram, and performing reconstruction
processing at the same time; and inputting a three-dimensional reconstruction image generated after reconstruction
processing, enabling the moving distance of the receiving screen to correspond to a reconstruction interval, and collecting axial structured light of which the focusing change is that each piece is changed by 5-6 pixel values. According to the invention, the
generation process of the three-dimensional axial structured light is simplified, the
light beam quality is ensured, the operation simplicity and control efficiency are obviously improved, the period and phase distribution of the
light beam can be accurately controlled, and the strict requirements of different application scenes on structured light parameters are met.