A Boundless Error Solving Method for Light Intensity Transmission Equation Under Non-Uniform Light Intensity

Abstract

The invention discloses a boundary-free error solving method for a light intensity transmission equation under non-uniform light intensity. The method comprises the steps that the axial differentiation and phase value of light intensity are initialized; an inaccurate phase value and the corresponding axial differential value of light intensity are calculated; the residual difference between the light intensity axial differential value after the current iteration and the light intensity axial differential value of the previous round is acquired; after each iteration is completed, whether the light intensity axial differential error and the corresponding phase residual difference are small enough is determined; when an iteration stop condition is satisfied, the acquired phase value is the exact phase value to be acquired; the light intensity transmission equation under non-uniform light intensity can be accurately solved; and the phase of an object to be measured is stably and accuratelyacquired. According to the invention, the phase value can be efficiently and accurately solved; and a solution error (phase difference) caused by a traditional method using a Teague auxiliary function is reduced, and especially a phase error acquired at a boundary.

Description

technical field [0001] The invention belongs to phase recovery and quantitative phase imaging technology in optical measurement, in particular to a method for solving the boundary error of light intensity transmission equation under non-uniform light intensity. Background technique [0002] Phase recovery is an important topic in optical measurement and imaging technology, and phase imaging technology is playing an important role in both biomedical and industrial detection fields. Throughout the progress of optical measurement for nearly half a century, the most classic phase measurement method is interferometry. However, the disadvantages of interferometry are also very obvious: interferometry generally requires a highly coherent light source (such as a laser), which requires a more complex interferometric device; the introduction of an additional reference optical path will make the optical system very demanding on the measurement environment. Harsh; speckle coherent nois...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for solving the error-free solution of the light intensity transmission equation under non-uniform light intensity to solve the problem of accurate phase recovery under non-uniform light intensity

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