Indoor holographic imaging technology based on multi-wavelength multi-dimensional laser scanning

Abstract Holographic imaging requires a light source with a high spatial coherence length to achieve clear interference fringes, while a single-wavelength laser light source can produce higher-order diffraction light and zero-order light spots, leading to deviations in the holographic imaging results generated by light projection. Therefore, this study investigates indoor holographic imaging technology based on multi-wavelength multi-dimensional laser scanning. By using laser scanning frequency domain filtering and light wave diffraction methods, the light field of the plane where the indoor space to be imaged is located is extracted, and the phase information of the plane light field is obtained. To address the phase wrapping caused by height variations, a dual-wavelength technique is employed for phase unwrapping. The method of superimposed linear and spherical phase factors is introduced to separate and eliminate the effects of zero-order light spots and higher-order diffraction light, resulting in a three-dimensional holographic image of the indoor space; ray projection calculations are performed on the obtained three-dimensional holographic image to overcome the uneven brightness distribution of the indoor space three-dimensional holographic image, enhancing the accuracy of three-dimensional reconstruction of the indoor space image. Experimental results show that this technology has advantages such as high resolution and rich immersion, with superior performance of the phase unwrapping algorithm, and favorable feedback on the signal-to-noise ratio, light coverage, and structural similarity of amplitude and phase tests.