Enhancement of Optical Interferometry Fringe Patterns Based on Multiscale Retinex Algorithm

An algorithm is proposed to enhance the optical interferometry fringe patterns based on the multiscale Retinex algorithm, and its principle and implementation are deseribed. Three different scales, i. e. , large, medium, and small, are selected, and the advantages of each scale are combined. Further, different weights arc considered for different scales according to the characteristics of the optical interferometry fringe patterns. Subsequently, the proposed method is compared with two commonly used optical interferometry fringe pattern enhancement methods by the experiment, and the effectiveness of the proposed method is demonstrated through subjective and objective evaluations. The experimental results denote that the algorithm proposed in this study can significantly improve the visibility of the fringe patterns exhibiting low contrast and overcome the difficulty associated with the subsequent processing of fringe patterns owing to uneven illumination.