Binocular phase retrieval based on the transport of intensity equation under multiwavelength illumination

Abstract

In view of the limitation that the transport of intensity equation method can only be used at a single wavelength, we propose a binocular phase retrieval algorithm based on multiwavelength illumination. First, we solve for the corresponding single-phase results at different wavelengths and then calculate the surface height of the object by combining the obtained synthetic wavelengths and synthetic phases, in order to reconstruct the initial phase results at different wavelengths. To solve the problem of amplification of traditional noise and surface profile noise in the phase diagram in the phase synthesis step, we introduce a step-by-step noise reduction method that can reduce the noise in the initial phase results to the level for a single wavelength and finally obtain the corresponding high-precision phase results at different wavelengths. The intensity images collected by the proposed dual-microscope system verify the correctness and effectiveness of the algorithm.

High accuracy phase retrieval algorithm based on the transport of intensity equation under multi-wavelength

“…Tab.2 Comparison of SNR under different methods the method in reference [10] the method in reference [13] the method in this paper 450nm The SNR value of the proposed algorithm in this paper is significantly higher than that of the compared algorithms,the denoising effect is better than that of the compared algorithms.…”

“…A pure phase object with intensity 1 is selected as the test object in the experiment. The initial phase diagram is In order to verify the correctness of the algorithm, we compare the method proposed in this paper with the literature [10] and the literature [13]. Figures 4(b) and (c) show the phase results obtained using the method of literature [10], and [   (13) Table 1 Comparison of root mean square error for different methods the method in reference [10] the method in reference [13] the To further illustrate the noise immunity of the proposed method, we compare the changes of RMSE values when the noise level changes between the methods in references [10] and literature [13] and this paper.…”

“…Xiong J et alproposed an improved dual-wavelength interferometric phase retrieval method [12] by combining the advantages of a shorter synthetic wavelength and an immune algorithm for phase blurring to achieve high-precision phase retrieval without additional wavelengths, but it can only be applied to the dual-wavelength level. The binocular microscopy phase retrieval based on the transport of intensity equation [13] proposed by Qi-Yang Zhang et al can not only meet the requirements of real-time imaging, but also be applicable in the multi-wavelength case,but introduce additional noise and the retrieval accuracy is not ideal in the noise case.…”