An unsupervised method for equivalent number of looks estimation in complex SAR scenes
This paper introduces a novel unsupervised estimator of equivalent number of looks (ENL) that can be applied to an arbitrary image. It avoids the assumption that homogeneous speckle will dominate the investigated image that is followed by current unsupervised ENL estimators but not always valid, especially for the complex SAR scenes with high mixture and texture. Incorporating the statistical properties of ENL data into an automatic segmentation method, we isolate the sub-class affected least by mixture and texture and suggest taking the mean value of this class as the final ENL estimate. The proposed estimator is evaluated in the experiments performed on simulated and real data from two very different sensors. It always gives better results than the other two existing methods and possesses greater adaptability.
This is the accepted manuscript version of the following article: Hu, D., Doulgeris, A.P. & Qiu, X. (2015). An unsupervised method for equivalent number of looks estimation in complex SAR scenes. 2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS). https://doi.org/10.1109/IGARSS.2015.7326309. Published version available at https://doi.org/10.1109/IGARSS.2015.7326309.