| 摘要 |
The invention relates to a method of generating a down-sampled video from a coded video, said down-sampled video being composed of output down-sampled frames having 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 DCT coefficients defining DCT blocks, said method comprising an error decoding step for delivering a decoded data signal from said coded video, said error decoding step comprising at least a variable length decoding sub-step applied to said quantized DCT coefficients in each DCT block for delivering variable length decoded DCT coefficients defining, a prediction step for delivering a motion-compensated signal of a previous output 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 is characterized 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 for delivering inverse quantized decoded DCT coefficients, and an inverse DCT sub-step performed on said inverse quantized decoded DCT coefficients for delivering pixel values defining said decoded data signal.
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