SCALABLE VIDEO ENCODING APPARATUS AND METHOD AND SCALABLE VIDEO DECODING APPARATUS AND METHOD

摘要

An apparatus and a method for encoding a scalable image and an apparatus and a method for decoding the scalable image are provided to enable a scalable video decoder to decode by using both a basic layer bit stream and an enhancement layer bit stream included a scalable bit stream to supply a new video CODEC which secures forward compatibility, thereby harmonizing the existing video CODEC with the improved video CODEC. A scalable bit stream is divided into at least two layers by encoding an original image having a predetermined image format(137). The scalable bit stream is a basic layer bit stream formed by encoding an enhancement layer identifier, a color difference element and a brightness element of a low frequency band included in the original image(131). Color difference element of remaining bands included in the original image are encoded to form the enhancement layer bit stream.