TY - GEN
T1 - A novel subband decomposition based speckle noise reduction algorithm for SAR images
AU - Karasakal, Gökhan
AU - Erer, I.
PY - 2007
Y1 - 2007
N2 - A new speckle reduction algorithm based on subband decomposition and multiscale edge detection is presented. The subband decomposition is performed using a DFT/RDFT-based symmetric, zero-phase, nonoverlapping digital filter bank. The noisy images are decomposed into sub-images using RDFT transform based subband decomposition, an edge image is obtained for each level using these sub-images, then a threshold value is estimated according to noise variance in each subband and soft-thresholding is applied on the non-edge regions of the subband images. The despeckled image is obtained from the thresholded subband images using the inverse RDFT transform. The proposed speckle reduction method is applied to several test images corrupted by speckle noise as well as experimental RADARSAT/SAR images. Despeckled images show that this method has better performance than the case where no edge information is used.
AB - A new speckle reduction algorithm based on subband decomposition and multiscale edge detection is presented. The subband decomposition is performed using a DFT/RDFT-based symmetric, zero-phase, nonoverlapping digital filter bank. The noisy images are decomposed into sub-images using RDFT transform based subband decomposition, an edge image is obtained for each level using these sub-images, then a threshold value is estimated according to noise variance in each subband and soft-thresholding is applied on the non-edge regions of the subband images. The despeckled image is obtained from the thresholded subband images using the inverse RDFT transform. The proposed speckle reduction method is applied to several test images corrupted by speckle noise as well as experimental RADARSAT/SAR images. Despeckled images show that this method has better performance than the case where no edge information is used.
UR - http://www.scopus.com/inward/record.url?scp=46449117980&partnerID=8YFLogxK
U2 - 10.1109/RAST.2007.4284015
DO - 10.1109/RAST.2007.4284015
M3 - Conference contribution
AN - SCOPUS:46449117980
SN - 1424410576
SN - 9781424410576
T3 - Proceedings of the 3rd International Conference on Recent Advances in Space Technologies, RAST 2007
SP - 373
EP - 378
BT - Proceedings of the 3rd International Conference on Recent Advances in Space Technologies, RAST 2007
T2 - 3rd International Conference on Recent Advances in Space Technologies, RAST 2007
Y2 - 14 June 2007 through 16 June 2007
ER -