Canon XL1 3CCD Camcorder User Manual

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‐Whenconvertingfrom486lineto480line(forexample,inDVDauthoring),you’llneedtocropsix

lines.Generally,fourlinesoffofthetopandtwolinesoffofthebottomworkswell.

‐Conversely,ifyou’regoingfrom480lineto486line,you’llneedtoaddsixlines‐Doingodd

numberscanswitchfieldorder,resultinginsubstantialproblems.



Scaling



‐Scalingisresizingthecroppedsourcerectangletotheproperoutputframesize,forexample,going

froma720x480sourceframetoa320x240outputframeforwebvideo.

‐Scalinguponeitheraxisforcesavideoeditingapplicationtomakeupdatathat’snotinthesource.

It’salwayspreferabletoscaledownonbothaxesifpossible.



‐Aspectratiocorrectionisimportanthere

Mostproductionformats,likeDV,usenonsquarepixels.ButDVisn’tever3:2;instead,it’seither4:3

or16:9.

‐NonsquarepixelsarealsousedforMPEG‐2forDVDandMPEG‐1forSVCDandwithdifferentshapes

forMPEG‐2forSVCD.

‐Conversely,mostwebvideoformatsusesquarepixels,whichmakesiteasiertodothemath.

‐Thekeytogettingaspectratiocorrectionrightwhenyouconverttosquarepixelsourcesfrom

nonsquarepixelsourcesistomakesurethattheoutputframesizematchesthesourceaspectratio.

Noisereduction



‐Removingnoise,especiallygrain,fromanimagemakesiteasiertocompress.

‐ThecommonlyusedMedianfilterisagoodblurfornoisereduction.Moreadvancedalgorithmstryto

bluronlythepartsoftheimagethathavegrainandmaytakeadvantageofdifferencesamong

frames.

‐Youdon’talwaysneedtoapplynoisereduction.Verycleansourceisn’thelpedbynoisereduction,

andnoisereductionmayhurtthesourceaudio.Typically,youshoulduseonlytheminimumnoise

reductionrequiredtosuppresspoorqualityinthesource.

Imageprocessing



‐Today,forthemostpart,modernformatsandtoolsautomaticallytakecareofimageadjustment,so

itismainlydonetoimprovethesuitabilityofthecontentforcompressionandisn’trequiredformost

projects.

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Canon XL1 3CCD Camcorder User Manual