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Effective Denoising with Non-local Means Filter for Reliable Unwrapping of Digital Holographic Interferometric Fringes

  • P. L. Aparna
  • Rahul G. Waghmare
  • Deepak Mishra
  • R. K. Sai Subrahmanyam Gorthi
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 703)

Abstract

Estimation of phase from the complex interference field has become an emerging area of research for last few decades. The phase values obtained by using arctan function are limited to the interval \((-\pi , \pi ]\). Such phase map is known as wrapped phase. The unwrapping process, which produces continuous phase map from the wrapped phase, becomes tedious in presence of noise. In this paper, we propose a preprocessing technique that removes the noise from the interference field, thereby improving the performance of naive unwrapping algorithms. For de-noising of the complex field, real part and imaginary parts of the field are processed separately. Real-valued images (real and imaginary parts) are processed using non-local means filter with non-Euclidian distance measure. The de-noised real and imaginary parts are then combined to form a clean interference field. MATLAB’s unwrap function is used as unwrapping algorithm to get the continuous phase from the cleaned interference field. Comparison with the Frost’s filter validates the applicability of proposed approach for processing the noisy interference field.

Keywords

Holographic interferometry Non-local means Non-Euclidian distance Phase unwrapping Image de-noising 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • P. L. Aparna
    • 1
  • Rahul G. Waghmare
    • 2
  • Deepak Mishra
    • 2
  • R. K. Sai Subrahmanyam Gorthi
    • 3
  1. 1.National Institute of TechnologySurathkalIndia
  2. 2.Indian Institute of Space Science and TechnologyTrivandrumIndia
  3. 3.Indian Institute of TechnologyTirupatiIndia

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