Scalable video transcoding method with spatial updatable scalability

A scalable bitstream syntax currently is used to realize the scalable video requirements. Compared with non-scalable video decoder, a much more complex video decoder is need to decode scalable bitstreams. However, it is considered that a video decoder should implement as simple as possible to play some quality video which users want. From this view point, a scalable video coding scheme by undatable bitstream is proposed to realize the scalability without scalable video decoder. Hence, as both of higher and lower layer bitstream are consequently one layer bitstream, they can be decoded by a simple one layer video decoder. Moreover, video transcoding methods are required for high speed. Hence, we use scalability technology to transcode video data. In this paper, we pay attention to spatial resolution. We propose spatial updatable scalability and explain this algorithm. Finally, our proposed method is evaluated from the view point of the coding efficiency.