Open Access Open Access  Restricted Access Subscription or Fee Access

MMSE based seed selection in IDAN speckle filter with point target preservation

Sanjay Shitole, Shaunak De, Y. S. Rao, B. Krishna Mohan, Anup Das


Intensity Driven Adaptive Neighborhood (IDAN) filter, is an adaptive filtering technique where a neighbourhood is formed using region growing method around each pixel. Pixels belonging to an adaptive intensity driven region are more likely to respect the local stationarity hypothesis than pixels belonging to a squared fixed size window. The advantage of the IDAN algorithm as compared to the other filters, is that the selected pixels are not required to lie within a fixed moving window. Fixed neighbourhood speckle reducing techniques are less effective for variations in feature size and shape. In IDAN filter, just like the original Lee Sigma filter, bias of underestimation has been problematic. In this work, we propose a new polarimetric SAR speckle filtering algorithm, based on the IDAN filter, which addresses the problem of bias. In the proposed filter, bias problem associated with IDAN filter is minimized by selecting Minimum Mean Square Error (MMSE) based estimated seed value and strong reflective targets (point targets) are preserved by statistical technique as used in the Improved Sigma filter. The proposed filter has been evaluated by using fully polarimetric air-borne AIRSAR L and C-band data and ALOS-PALSAR L-band and RADARSAT-2 Cband space-borne data. Well known indices are used for the quantitative and qualitative performance evaluation. It is found that, the proposed filter shows reduction in bias as compared to IDAN filter, while having improved point target and edge preservation ability.


PolSAR, speckle filtering, polarimetry, region growing

Full Text:


Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.