The retrieval technology based on the Nonsubsampled Contourlet transform for shape feature of SAR images
Gong Zhang · Radar & Ecm · 2008
The nonsubsampled Contourlet transform(NSCT) provides a flexible multi-scale,multi-direction,and shift-invariant image representation.A new approach to combine the advantages of both Canny algorithm and NSCT for SAR image retrieval of shape features is proposed in this paper.Firstly the Canny operator to detect the edges of image is used,and then the image is decomposed with NSCT.The energy,standard deviation,and third central moment are choosen as the shape features.The shape retrieval performance of NSCT is compared to those of the conventional transforms including the 2-D wavelet,and the Contourlet.An experiment shows that the NSCT outperforms the other two transforms in texture image retrieval.