Lesson 22 Digital Image fundamentals.ppt

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1、Unit8Image&VideoLesson22DigitalImageFundamentalsLesson22DigitalImageFundamentalsVocabularyBackgroundsTexttourVocabularyShadeindictionaryLightdiminishedinintensityasaresultoftheinterceptionoftherays;partialdarkness.阴影Anareaoraspaceofpartialdarkness.阴影部分Coverorshelterprovidedbyinterceptionbya

2、nobjectofthesunoritsrays.遮蔽处或隐蔽处Anyofvariousdevicesusedtoreduceorscreenlightorheat.遮阳物ShadeindictionaryThepartofapictureorphotographdepictingdarknessorshadow.暗部Thedegreetowhichacolorismixedwithblackorisdecreasinglyilluminated;gradationofdarkness.暗度ShadeindictionaryAslightdifferenceorvariati

3、on;anuance:细微差别shadesofmeaning.Asmallamount;atrace:少量；痕迹detectedashadeofbitternessinherremarks.Apresentreminderofapersonorsituationinthepast:记忆shadesofmyhigh-schooldays.ShadeintextForgrayscaleimages,eachpixelisassignedanumberthatrepresentsthegrayshadeassignedtothatpixel.对灰度图而言，每个像素被赋予一个代表该像

4、素灰度级的数值。Shadeinuseashadeof少许,微微castintotheshade使失色,使相形见绌fallintotheshade被夺去光彩,黯然失色intheshade在树阴下;在暗处;默默无闻notashadeofdoubt毫不怀疑theshadesofevening暮色theshadowofashade幻影withoutlightandshade没有明暗的,单调的EqualizationindictionaryThegenerictermfortheprocessofcorrectingundesiredtransmissioncharacteristic

5、sofachannel.Inlinetransmission,forexample,signalattenuationnormallyincreaseswithfrequency.Equalizationinthiscasecanconsistoftheinsertioninthelineofoneormorenetworkshavingtheinverseamplitude/frequencycharacteristics,sothatoveradesiredfrequencybandtheoverallattenuationofthelineismadesubstanti

6、allyconstant.EqualizationintextWhenanimageusesonlyasmallportionoftheavailablegrayscalelevels,histogramequalizationcanbeusedtospreadouttheusageofgrayscalelevelsovertheentireavailablerange.当一幅图像只用了可用灰度级的一小部分时，可以使用直方图均衡的方法将灰度级的使用扩展到整个可用的范围。Equalizationinuseautomaticequalization自动均衡delayequaliz

7、ation延迟均衡[补偿]groupdelayequalization群时延均衡histogramequalization直方图均衡化sidebandequalization边带均衡KernelindictionaryAgrainorseed,asofacerealgrass,enclosedinahusk.谷粒或种子Theinner,usuallyedibleseedofanutorfruitstone.核Themostmaterialandcentralpart;thecore:中心；核心Kerne