Bivariate Gamma Distribution for Wavelength-Resolution SAR Change Detection

Wavelength-Resolution SAR Ground Scene Prediction Based on Image Stack

“…For example, for a detection probability of 98%, our proposed change detection method presents log 10 (FAR) about −0.5, while [12,17,24] have log 10 (FAR) about 1.4, −0.3 and 0.14, respectively. For log 10 (FAR) = −0.9, i.e., a very low FAR, the probability detection given by [12] drops to 60%, while our proposal still maintains the probability of detection more than 90%.…”

“…The quantity P d was obtained from the ratio between the number of detected targets and the total numbers of known targets, while FAR is defined by the number of false alarms detected per square kilometer [26]. Figure 8 presents the receiver operating characteristic (ROC) curves [48] of the change detection results, showing the probability of detection versus the false alarm rates for the different evaluated values of C. We compared the change detection results obtained from the proposed method with the results described in [12,17,24]. The proposed method excels in terms of probability of detection and false alarm rate in comparison to [12,17,24].…”

“…Change detection algorithms (CDA) have been widely considered over the years in the detection of distinct targets in SAR images [22][23][24]. In particular, the wavelength-resolution SAR change detection is an important topic of research and has been studied for more than a decade [17].…”

“…In particular, the wavelength-resolution SAR change detection is an important topic of research and has been studied for more than a decade [17]. Wavelength-resolution systems have also shown unique results with high detectability rate on a low false alarm rate per square km, as presented, for example, in [17,24]. The nature of the wavelength-resolution SAR imagery can be exploited to facilitate the design of CDAs, since (i) the contribution of small scatterers to radar echoes is not significant for the wavelength of several meters; (ii) scatter from large objects are the main contribution; (iii) large scatterers are usually stable in time and less sensitive to environmental effects; and (iv) the wavelength-resolution almost totally cancel the speckle noise [16] in the SAR image given a very stable backscattering between measurements.…”

“…In particular, we employed the median GSP image obtained based on stack statistics as a reference image in a CDA based on the detection analysis step of the CDA presented in [26], which was evaluated in terms of target detection probability and false alarm rate. The results reported in [12,17,24] were adopted as the reference model for comparison.…”