3D-frequency splitting and coding of HDTV signals

Summary form only given. A two-stage coding system for reducing the high data rate is reported. Three-dimensional subsampling is used to create the baseband of the interlaced source signal. A motion-adaptive filter structure adjusts the three-dimensional spectrum of the television signal to some reduced region supported by the quincunx sampling pattern. By interpolating the subsampled signal (main signal) in the transmitter, calculating the difference from the original, and subsampling the difference signal again, the error signal results. Both signals have to be coded to achieve a complete bit rate of less than 140 Mb/s. Transform coding is applied to the main signal. A modified threshold-coding scheme is applied to the DCT coefficients. In order to avoid artifacts in the reconstructed (moving) sequence, threshold, normalization, and quantization of the coefficients are adapted to the local picture content. In regions where the spatial resolution has been reduced by the filtering process, the error signal is coded, transmitted and added to th main signal to improve the picture quality. Tree coding has been investigated for this purpose. Simulations of the algorithms have been performed with TV and HDTV sequences