Patent ID: 7864219
Filing Date: 2011-01-04
Classification: H04N

Abstract:
1. A video-signal layered decoding apparatus for decoding an input bitsteam at a plurality of decoding layers exhibiting different spatial resolutions, the apparatus comprising at each decoding layer: a separator to separate an input bitsteam into first coded data, second coded data and a coded quantization parameter, the first coded data being an encoded version of a resolution-lowered video signal exhibiting a spatial resolution lower than an original video signal and obtained by spatially scaling down the original video signal, the second coded data being an encoded version of the original video signal obtained through inter-spatial resolution prediction using a high-resolution scaled-up video signal as a predictive signal and exhibiting a spatial resolution higher than the resolution-lowered video signal, the high-resolution scaled-up video signal being obtained by spatially scaling up a decoded signal through a high-resolution procedure based on the quantization parameter, the decoded signal being obtained through a decoding procedure to the resolution-lowered video signal, the quantization parameter being used in encoding the resolution-lowered video signal; a first decoder to decode the coded quantization parameter and decode the separated first coded data using the quantization parameter thus decoded to obtain the resolution-lowered video signal; a reconstructor to spatially scale up the resolution-lowered video signal to reconstruct the high-resolution scaled-up video signal based on the quantization parameter thus decoded; and a second decoder to decode the separated second coded data through inter-spatial resolution prediction using the reconstructed high-resolution scaled-up video signal as a predictive signal, thus obtaining a reproduced video signal of the same high spatial resolution as the input original video signal.