Quaternion wavelet transform based full reference image quality assessment for multiply distorted images.

Most of real-world image distortions are multiply distortion rather than single distortion. To address this issue, in this paper we propose a quaternion wavelet transform (QWT) based full reference image quality assessment (FR IQA) metric for multiply distorted images, which jointly considers the local similarity of phase and magnitude of each subband via QWT. Firstly, the reference images and distorted images are decomposed by QWT, and then the similarity of amplitude and phase are calculated on each subband, thirdly the IQA metric is constructed by the weighting method considering human visual system (HVS) characteristics, and lastly the scores of each subband are averaged to get the quality score of test image. Experimental results show that the proposed method outperforms the state of art in multiply distorted IQA

Modeling of fuel retention in the pre-damaged tungsten with MeV W ions after exposure to D plasma

Modeling of high-Z ion irradiated-induced damages on fuel retention inside tungsten (W) material has been performed in this work. The upgraded Hydrogen Isotope Inventory Processes Code (HIIPC) is applied to model the deuterium (D) retention inside pre-damaged W during exposed to low-energy D flux, and the W is pre-irradiated by 20 MeV W-ion before exposed to D flux. Three types of trap, i.e. mono-vacancies, dislocations and grain boundary vacancies, are considered in the present model. The mono-vacancy defects induced by energetic W ions are calculated by SRIM code. First, the model is validated against the available experimental data under the same D flux exposure conditions, showing the reasonable agreement. Then, the effect of radiation-induced defects produced by pre-exposed energetic W-ion with different energy and fluence on the fuel retention are studied, confirming that the irradiation-induced traps play a dominated role on the fuel retention in the surface of the material (∼ micrometer). Finally, the effects of different type of defect, D fluence, and wall temperature on the fuel retention are discussed systemically, and these modeling results are in well agreement with the previous studies

Several IQA comparison on the LIVEMD image database.

<p>Several IQA comparison on the LIVEMD image database.</p

Several IQA algorithm comparison on the blur and JPEG image dataset.

<p>Several IQA algorithm comparison on the blur and JPEG image dataset.</p

Amplitude and phase images of each subband via QWT.

<p>Amplitude and phase images of each subband via QWT.</p

Several IQA comparison on the MDID2013 image database.

<p>Several IQA comparison on the MDID2013 image database.</p

Several IQA comparison on single distortion LIVE image database.

<p>Several IQA comparison on single distortion LIVE image database.</p

QWT-IQA scores against DMOS on the LIVEMD image database.

<p>QWT-IQA scores against DMOS on the LIVEMD image database.</p

Several IQA algorithm comparison on the blur and noise image dataset.

<p>Several IQA algorithm comparison on the blur and noise image dataset.</p