new universal image quality index was proposed. Our experimental
results indicate that it outperforms the MSE significantly
under different types of image distortions. It is perhaps
surprising that such a simple mathematically defined quality
index performs so well without any HVS model explicitly employed.
We think the success is due to its strong ability in measuring
information loss occurred during the image degradation
processes. This is a clear distinction with MSE, which is sensitive
to the energy of errors, instead of real information loss. In
the future, more extensive experiments are needed to fully validate
the new index