| 摘要 |
In video coding techniques, in order to improve a coding efficiency and reduce a computational complexity sharply by mixing a temporal scalability and a spatial scalability, a spatio-temporal hybrid scalable video coding method using subband decomposition in accordance with the present invention includes classifying an input picture sequence into a picture of a low frame frequency BL (base layer) and a picture of a high frame frequency EL (enhancement layer) by sampling the sequence according to a time axis; decomposing the pictures on the BL and the EL into four subbands (LL, LH, HL, HH), coding the low frequency element subband (LL) at the spatial scalability BL having a low spatial resolution and coding the rest subbands (LH, HL, HH) at the EL having a high spatial resolution; decoding coding data of the temporal scalability BL in order to get a picture having a low temporal resolution and decoding coding data of the temporal scalability BL and the temporal scalability EL together in order to get a picture having a high temporal resolution; and decoding the subband (LL) of the spatial scalability BL in order to get a picture having a low spatial resolution and decoding the low frequency element subband (LL) and the high frequency element subbands (LH, HL, HH) together in order to get a picture having a high spatial resolution.
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