An information-theoretic sar heterogeneity feature

In this work, a heterogeneity feature, calculable from SAR images on a per-pixel basis, but relying on global image statistics, is described and discussed. Starting from the multiplicative speckle and texture models relating the amount of texture and speckle to the local mean and variance at every pixel, such a feature is rigorously derived from Shannon's information theory as the conditional information of local standard deviation to local mean. Thanks to robust statistical estimation, it is very little sensitive to the noise affecting SAR data and thus capable of capturing subtle variations of texture, whenever they are embedded in a heavy speckle. Experimental results carried out on a variety of SAR images with different degrees of noisiness demonstrate that the proposed feature is likely to be useful for a variety of automated segmentation and classification tasks.