MPEG-2 down-sampled video generation

专利名称：MPEG-2 down-sampled video generation发明人：Yann Le Maguet,Guy Normand,Ilhem

Ouachani

申请号：US10028098申请日：20011221

公开号：US20020136308A1公开日：20020926

专利附图：

摘要：The invention relates to a method of generating a down-sampled video from acoded video, said down-sampled video being composed of output down-sampled frameshaving a smaller format than input frames composing said coded video, said input coded

video being coded according to a block-based technique and comprising quantized DCTcoefficients defining DCT blocks, said method comprising an error decoding step fordelivering a decoded data signal from said coded video, said error decoding stepcomprising at least a variable length decoding sub-step applied to said quantized DCTcoefficients in each DCT block for delivering variable length decoded DCT coefficientsdefining, a prediction step for delivering a motion-compensated signal of a previousoutput frame, an addition step for adding said decoded data signal to said motion-compensated signal and resulting in said output down-sampled frames. This method ischaracterized in that the error decoding step also comprises an inverse quantization sub-step performed on a limited number of said variable length decoded DCT coefficients fordelivering inverse quantized decoded DCT coefficients, and an inverse DCT sub-stepperformed on said inverse quantized decoded DCT coefficients for delivering pixel valuesdefining said decoded data signal.

申请人：LE MAGUET YANN,NORMAND GUY,OUACHANI ILHEM

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