MI Zeng-zhen. Image Quality Evaluation Method Based on Frequency and Direction Weighted to CSF in Wavelet Domain[J]. Acta Electronica Sinica, 2014, 42(7): 1273-1276.
MI Zeng-zhen. Image Quality Evaluation Method Based on Frequency and Direction Weighted to CSF in Wavelet Domain[J]. Acta Electronica Sinica, 2014, 42(7): 1273-1276. DOI: 10.3969/j.issn.0372-2112.2014.07.005.
In order to solve the defects of SSIM algorithm for image quality evaluation
frequency and direction weighed to CSF in Wavelet domain was proposed.This method organic combination the multi-resolution characteristics of wavelet with bandpass characteristic of CSF curve
and get a new algorithm based on SSIM.Firstly
the frequency normalized CSF curves according to 1 octave level into five parts
and then 5 levels CDF 9/7 pairs of orthogonal wavelet decomposition and reconstruction
to get a low-frequency sub-band LL and a plurality of medium or high frequency sub-band HH
i
HL
i
and LH
i
then
assign different weights according to different frequencies
different directions
which were multiplied with the corresponding sub-band SSIM values
and then do accumulate operations to obtain the weighted structural similarity in wavelet domain named WWSSIM.Experiments show that WWSSIM algorithm has high monotonicity