Motion Detectionusing PCA.ppt

MotionDetection******@:(2-Dand3-Dblocks)ResultsSampleVideosandResultsVideowith8x8DetectionBlocksVideowith32x32DetectionBlocksMatlabCodeSourceCode2InputVideoMPEGvideoconvertedto2688JPEGimageframesFullRGBcolor3AlgorithmStepsReshapeimageto8x8blocksCollectblocksfromeveryframe,normalizeandreshapearrayfrom3-putePCAscorebyprojectingblocksfromeachframeontothatblock’s3-puteEVvalueswithW=3foreachblockGenerateglobalthresholdbasedonallblocksandframesGeneratelocaldynamicthresholdforeachblock/framewithW=3Generatemotionmatrixbasedonlocalandglobaldynamicthresholdforallblocks-frames4Step1-:saveperframeblockdata5Step1-ReshapeImage6Step1-CodefileName=...;imN=imread(fileName);imN=imresize(imN,);imN=rgb2gray(imN);imCols=im2col(imN,[bHbW],'distinct');imT=imCols';7Step1-8x8BlockSizeBlocksizerelativetoimagesizeBlock26x25ImageSize:36x48blocks8Step2-CollectBlocksCollectsameblockfromalltheframesCreateasinglematrixforeachblocklocationReshapevectorfrom3-D8x8blocksThereare1728matricesholdingpixelvaluesEachmatrixis2688x64(framesxpixels/block)9Step2-NormalizeBlocksNormalizeeachblockbyitsmeanvalueEachblockhasitsmeansubtractedfromeachofthe64pixelvaluesStorethenormalizedblockdatatobeusedinStep3andStep410