A study on new DCT-based bit rate reduction algorithm and variable speed playback for a home-use digital VCR

摘要

A discrete cosine transform (DCT)-based block adaptive image data compression scheme is proposed for a home-use digital video cassette recorder (VCR). The technique maintains a high picture quality at a moderate bit rate. To attain a reasonable picture quality in high-speed playback, a segment forming method and a recording sequence of the encoded data were developed. The coding constraints for high-speed playback are reviewed. The coding scheme proposed for bit rate reduction in a digital VCR is described. Computer simulation results are presented. The simulation results show that the bit rate reduction scheme could attain not only subjectively good picture quality in normal-speed playback, but also an acceptable picture quality in high-speed playback.