Highly efficient coding apparatus producing encoded high resolution signals reproducible by a VTR intended for use with standard resolution signals

摘要

A highly efficient coding apparatus encodes high resolution digital video data so it can be decoded as either high resolution format or standard resolution format video data. The high resolution video data is divided into blocks, and then into sub-blocks of N picture elements, where N is the ratio of the resolution of the high resolution format to that of the standard resolution format. Each sub-block of N picture elements is averaged, and the averaged data is encoded via adaptive dynamic range coding (ADRC). The encoded averaged data can be decoded as standard resolution video data. The difference between each of the N picture elements and its corresponding average value is separately encoded as additional data. The combined encoded averaged data and additional data can be decoded as high resolution video data. Also, ADRC encoded data recorded by a standard resolution VTR can be reproduced by a high resolution VTR to provide a signal having a high resolution number of picture elements although only a standard resolution image.