简介：Thispaperpresentsamethodologytodeterminethreedataquality(DQ)riskcharacteristics:accuracy,comprehensivenessandnonmembership.Themethodologyprovidesasetofquantitativemodelstoconfirmtheinformationqualityrisksforthedatabaseofthegeographicalinformationsystem(GIS).FourquantitativemeasuresareintroducedtoexaminehowthequalityrisksofsourceinformationaffectthequalityofinformationoutputsproducedusingtherelationalalgebraoperationsSelection,Projection,and...

简介：没有它的参考图象或失真类型的优先的知识，盲目图象质量评价(BIQA)能估计一幅弄歪的图象的感性的质量。在这份报纸，一个新奇BIQA模型在小浪领域被开发。就多决定和分离小浪变换(DWT)的band-passing特征而言，在力量光谱上的改进被提出，即，称的小浪力量光谱(WPS)评价。然后，方向性的WPS的概念被使用简化计算。而且，人的视觉系统(HVS)的一个旋转地对称的调整转移函数(MTF)作为一个过滤器综合，它做度量标准与人的视觉感觉和更多一致歧视。实验在实时数据库和三个另外的数据库上被进行，并且结果证明建议度量标准高度与主观评估被相关，它以有效性和坚韧性与另外的最先进的度量标准竞争很好。

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简介：ThewaterdistributionsystemofoneresidentialdistrictinTianjinistakenasanexampletoanalyzethechangesofwaterquality.Partialleastsquares(PLS)regressionmodel,inwhichtheturbidityandFeareregardedascontrolobjectives,isusedtoestablishthestatisticalmodel.TheexperimentalresultsindicatethatthePLSregressionmodelhasgoodpredictedresultsofwaterqualitycomparedwiththemonitoreddata.Thepercentagesofabsoluterelativeerror(below15%,20%,30%)are44.4%,66.7%,100%(turbidity)and33.3%,44.4%,77.8%(Fe)onthe4thsamplingpoint;77.8%,88.9%,88.9%(turbidity)and44.4%,55.6%,66.7%(Fe)onthe5thsamplingpoint.

简介：Asymmetricstereoscopicvideocodingcantakeadvantageofbinocularsuppressioninhumanvisionbyrepresentingoneofthetwoviewsinlowerquality.Thispaperproposesabitallocationstrategyforasymmetricstereoscopicvideocoding.Inordertoimprovetheaccuracyofbitallocationandratecontrolintheleftview,aproportionalintegral-derivativecontrollerisadopted.Meanwhile,tocontrolthequalityfluctuationbetweenconsecutiveframesoftheleftview,aqualitycontrollerisadopted.Besides,afuzzycontrollerisproposedtocontrolthevariationinqualitybetweentheleftandrightviewsbycomparingthePSNRdisparityoftwoviewswithafixedthreshold,whichisusedtoquantizethebinocularpsycho-visualredundancyandadjustthequantizationparameter(QP)oftherightviewcorrespondingly.TheproposedalgorithmhasbeenimplementedinH.264/AVCvideocodec,andtheexperimentalresultsshowitseffectivenessinratecontrolwhilekeepingagoodqualityfortheleftview,andfewerbitsareallocatedfortherightviewsothattheoverallbitrateissavedby7.2%atmostwithoutthelossofsubjectivevisualqualityforstereoscopicvideo.