Abstract
It is often observed that phases in complex transform of images are important ingredients compared to their magnitude for information extraction. Literature indicates that these phases are immune to noise. The aim of this paper is to find the structural (Edge) and statistical information retained by the complex domain phases for the images corrupted with additive white Gaussian noise (AWGN) and multiplicative (speckle) noise. Initially, we measure the edge information preserved by both phase and magnitude only synthesized image using edge mismatch error (EMM), to illustrate the significance of phase in image restoration and reconstruction. A mathematical model for the sensitivity of phase and magnitude is derived to examine the respective rate of deterioration under varying noise strength. Both the mathematical finding and experimental results indicate that the phase of any complex transform is degraded slowly compared to its magnitude. Comparative analysis of effect of noise on these phases is also investigated and reported.
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Notes
- 1.
In our earlier work a comparative analysis on different phases reveal the importance of phase based reconstruction over magnitude based reconstruction [9].
- 2.
The phase only reconstructed image was synthesized from the phase of respective transform (such as FT, CWT and CT) with unity magnitude. Similarly, the magnitude only reconstructed image was synthesized by preserving magnitude information with unity phase.
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Panigrahi, S.K., Gupta, S. (2019). Mathematical Analysis of Image Information Retained in the Complex Domain Phases Under Additive and Multiplicative Noise. In: Singh, M., Gupta, P., Tyagi, V., Flusser, J., Ören, T., Kashyap, R. (eds) Advances in Computing and Data Sciences. ICACDS 2019. Communications in Computer and Information Science, vol 1046. Springer, Singapore. https://doi.org/10.1007/978-981-13-9942-8_59
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