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Block Matching Algorithms for Motion Estimation
4.0分
Thispaper(andaccompanyingMATLABsourcecode)isareviewoftheblockmatchingalgorithmsusedformotionestimationinvideocompression.Itimplementsandcompares7differenttypesofblockmatchingalgorithmsthatrangefromtheverybasicExhaustiveSearchtotherecentfastadaptivealgorithmslikeAdaptiveRoodPatternSearch.Thealgorithmsthatareevaluatedinthispaperarewidelyacceptedbythevideocompressingcommunityandhavebeenusedinimplementingvariousstandards,rangingfromMPEG1/H.261toMPEG4/H.263.Thepaperalsopresentsaverybriefintroductiontotheentireflowofvideocompression.
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Image correspondences using cross-correlation
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Findingcorrespondingfeaturesinapairofimagesisthebasisofmanyopticflow,stereovisionandimageregistrationalgorithms.Onestraightforwardapproachtofindingamatchistotakeasmallpatchofoneimage,computeitsslidingcross-correlationwiththeotherimage,andfindapeak.Thissubmissionsuppliesaclasswhichimplementsthismethod.Therearemanyotherwaysoffindingcorrespondences,butnormalisedcross-correlationisrelativelyeasytounderstand,andfairlyeffectiveifasparsesetofmatchesissufficientandthechangeinviewpointisnottoolarge.Th
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仿射光流
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Anaffine(orfirst-order)opticflowmodelhas6parameters,describingimagetranslation,dilation,rotationandshear.Theclassaffine_flowprovidesmethodstoestimatestheseparametersfortwoframesofanimagesequence.Theclassimplementsaleast-squaresfitoftheparameterstoestimatesofthespatialandtemporalgrey-levelgradients.Thisisanextensionofthewell-knownLucas-Kanademethod.Theimagesareeithersampledconventionally,onarectilineargrid,oronalog-polargrid.Inthelattercase,theclassmayiterativelyrefineitsestimatesbymovingthesamplin
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采用块匹配法计算运动矢量
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采用块匹配法计算运动矢量，选择经典的三步法进行搜索，配有相应的文献说明，利用MAD进行阈值选取，初步计算出两幅图像的运动矢量，为下一步全局运动的估计提供参数。
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