C1, C2, and C3 avoid singularities when the denominators would otherwise be small,where K1 and K2 are arbitrarily taken as 0.01 and 0.03,respectively,and L is the dynamic range of the image [9]. Regardless of the choice of constants, MSSIM=1 occurs only if the images are identical. Following Wang et al. [9], a Gaussian-weighted convolution window was chosen. 
Eq.(4) implies that every part of the 2D field is equally important for analyzing the structure,which is a poor assumption for acoustic signals.In light of this,a weighted SSIM(WSSIM) was used
 
C1, C2, and C3 avoid singularities when the denominators would otherwise be small,where K1 and K2 are arbitrarily taken as 0.01 and 0.03,respectively,and L is the dynamic range of the image [9]. Regardless of the choice of constants, MSSIM=1 occurs only if the images are identical. Following Wang et al. [9], a Gaussian-weighted convolution window was chosen. Eq.(4) implies that every part of the 2D field is equally important for analyzing the structure,which is a poor assumption for acoustic signals.In light of this,a weighted SSIM(WSSIM) was used
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