A Frequency Domain MPEG-2 Drift-Free Transcoder and Its Rate Control Strategy
Fan Xiao · Dianzi xuebao · 2001
The methods of calculating the DCT coefficients of the matching blocks from the derived DCT coefficients of the blocks in the reference frames under three different prediction modes of MPEG 2 is discussed,based on which a drift free MPEG 2 transcoder that achieves motion compensation in the frequency domain is proposed.The rate distortion optimization is applied to the rate control strategy to get the optimal quantization parameter of each frame,with its fast algorithm further simplified on the basis of G BFOS method.Our approach can lead to the solutions of satisfactory accuracy but only with a fraction of the complexity of the existing algorithms.