Prediction from off-grid samples using continuous normalized convolution
Signal Processing
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Several methods to perform multiresolution transmission of HDTV through subband coding are compared. The first is simple intraframe encoding of the spatial subbands of the video. The authors have used the subband decomposition for both hierarchical estimation of the motion as well as encoding of the compensated error function. They have used block matching for motion estimation on both 2D lowpass and bandpass (QMF) pyramids. They found that the motion estimation on the lowpass QMF pyramid performs better than the motion estimation on the bandpass QMF pyramid. They achieved approximately the same quality reconstructed video with either backward or forward motion compensated schemes. For multiresolution transmission, by simulating a test sequence, they have obtained a PSNR of 35 dB at the bit rate of 0.44 bits per pixel with adaptive PCM and at a bit rate of 0.53 bits pet pixel with PCM. Such a result would require 0.75 bits per pixel for the intraframe scheme. The complexity of the motion compensated multiresolution coding scheme is comparable to that of a single resolution method