《2017年成人高考政治试题(专升本)》.ppt

文档介绍：预测技术(Prediction)范晓鹏******@《数据压缩技术》课程第二讲主要内容预测技术(2学时)预测编码视频压缩中的预测技术LosslessPredictiveCodingPredictivetechniqueMakesuseofcorrelationbetweenneighboringvaluesIntypicalimagesvaluesofadjacentpixelsarehighlycorrelatedIntypicalaudiovaluesofadjacentsamplesarehighlycorrelated(speechconsistsofmainlysilence)DPCM(DifferentialPulseCodeModulation):monformofLosslessPredictiveCoding*LosslessDPCM:*LosslessDPCMEncoder*Predictorentropycoder-LosslessDPCMDecoder*entropydecoder+Predictor*Prediction/DifferentialCodingOutlinePredictPixelvaluebasedonNeighboringPixelsFindtheError(Residual)Residual=Original–PredictedValueQuantizeErrorEncodeQuantizedError*PixelPredictionABCXPixelbeingpredictedX=a·A+b·B+c·CA,B,C:PixelValuesa,b,c:PredictionCoefficients*DistributionofValuesinOriginalandResidualImages