|
IW-SSIM: Information Content Weighted Structural Similarity
Index for Image Quality Assessment Zhou Wang
|
Information content weighted
structural similarity measure (IW-SSIM) is an extension of the structural similarity (SSIM) index
by incorporating the idea of information content weighted pooling. The same
idea can also be applied to peak signal-to-noise ratio (PSNR), leading to an
information content weighted PSNR (IW-PSNR). More information is provided in
the following paper:
-
Zhou Wang
and Qiang Li, "Information
Content Weighting for Perceptual Image Quality Assessment," IEEE Transactions on Image Processing, vol. 20, no. 5, pp. 1185-1198, May 2011.
Source
Code and Test Results
Five algorithms (PSNR, IW-PSNR, SSIM, MS-SSIM,
and IW-SSIM) are tested with six publicly available subject-rated independent
image databases (LIVE
database, Cornell
A57 database, IVC database,
Toyama database, TID2008 database, and CSIQ database). In all databases,
only the distorted images are included in our tests (reference images
excluded). When the images are in RGB color, a Matlab
function rgb2gray is used to convert
the images to gray scale. The Matlab source code and
test results (in Matlab .mat format) are provided
here for future comparisons:
|
Model |
Source Code |
LIVE |
Cornell-A57 |
IVC |
Toyama |
TID2008 |
CSIQ |
|
PSNR |
|||||||
|
IW-PSNR |
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|
SSIM |
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|
MS-SSIM |
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|
IW-SSIM |
A Python implementation by Xinyu Guo is available here, and is also available at Github.
Our evaluations based on Spearman
rank correlation coefficient (SRCC) and Kendall rank correlation coefficient
(KRCC) are as follows. The Average values were computed as the direct average
of 6 databases. The Weighted-Average computation takes into account the sizes
of the 6 databases, i.e., a weighted average based on the number of images in
each database (779, 54, 185, 168, 1700, and 866 for the 6 databases, respectively).
SRCC Results
|
Model |
LIVE |
Cornell-A57 |
IVC |
Toyama |
TID2008 |
CSIQ |
Average |
Weighted-Average |
|
PSNR |
0.8756 |
0.6189 |
0.6884 |
0.6132 |
0.5531 |
0.8058 |
0.6925 |
0.6887 |
|
IW-PSNR |
0.9328 |
0.8759 |
0.8998 |
0.8475 |
0.6823 |
0.8311 |
0.8449 |
0.7896 |
|
SSIM |
0.9479 |
0.8066 |
0.9018 |
0.8794 |
0.7749 |
0.8756 |
0.8644 |
0.8455 |
|
MS-SSIM |
0.9513 |
0.8414 |
0.8980 |
0.8874 |
0.8542 |
0.9133 |
0.8909 |
0.8914 |
|
IW-SSIM |
0.9567 |
0.8709 |
0.9125 |
0.9202 |
0.8559 |
0.9213 |
0.9063 |
0.8978 |
KRCC Results
|
Model |
LIVE |
Cornell-A57 |
IVC |
Toyama |
TID2008 |
CSIQ |
Average |
Weighted-Average |
|
PSNR |
0.6865 |
0.4309 |
0.5218 |
0.4443 |
0.4027 |
0.6084 |
0.5158 |
0.5172 |
|
IW-PSNR |
0.7800 |
0.6967 |
0.7165 |
0.6508 |
0.5255 |
0.6592 |
0.6715 |
0.6267 |
|
SSIM |
0.7963 |
0.6058 |
0.7223 |
0.6939 |
0.5768 |
0.6907 |
0.6810 |
0.6615 |
|
MS-SSIM |
0.8044 |
0.6478 |
0.7203 |
0.7029 |
0.6568 |
0.7393 |
0.7119 |
0.7116 |
|
IW-SSIM |
0.8175 |
0.6842 |
0.7339 |
0.7537 |
0.6636 |
0.7529 |
0.7343 |
0.7240 |
Created
Jan. 14, 2010
Last
updated May 11, 2020