Scalable video coding method and apparatus and scalable video decoding method and apparatus
Provided are a scalable video coding method and apparatus, and a scalable video decoding method and apparatus. The coding method generates a base layer bitstream of video by using one of a plurality of codecs, determines whether the used codec supports enhancement layer coding, decodes the base layer bitstream according to the result of the determination in order to extract coded information used for the generation of the base layer bitstream, and generates an enhancement layer bitstream of the original video based on the extracted information. Accordingly, it is possible to provide high-quality video and increase coding efficiency while using the various existing codecs.
1. A scalable video coding method comprising:
generating a basic layer bitstream of video by using one of a plurality of codecs;
identifying which codec is used for generating the base layer bitstream;
decoding the base layer bitstream according to the result of the identifying in order to extract coding information used to generate the base layer bitstream; and
generating an enhancement layer bitstream of the original video based on the extracted coding information.
2. The method of claim 1 , wherein the coding information comprises at least one of macroblock type information, a coded block pattern (CBP), motion vectors, and quantized transform coefficients.
3. The method of claim 1 , wherein the identifying of which codec is used for generating the base layer comprises:
identifying the type of the codec used for coding by parsing the base layer bitstream; and
determining whether the type of the used codec supports enhancement layer coding.
4. The method of claim 1 , wherein the generating of the enhancement layer bitstream comprises generating an enhancement layer bitstream by coding residual video between the original video and the reconstructed video based on the extracted coding information.
5. The method of claim 1 , further comprising:
downscaling the received original video; and
generating the base layer bitstream by coding the downscaled video.
6. A scalable video decoding method comprising:
dividing a received bitstream into a base layer bitstream and an enhancement layer bitstream;
identifying which codec is used for coding the base layer bitstream;
decoding the base layer bitstream according to the result of the identifying in order to extract information for coding the base layer bitstream; and
decoding the enhancement layer bitstream based on the extracted information.
7. The method of claim 6 , wherein the extracted information comprises at least one of block type information, motion vectors, a coded block pattern (CBP), and quantized transform coefficients.
8. A scalable video coding apparatus comprising:
a base layer coding unit to generate a base layer bitstream of video by using one of a plurality of codecs;
a codec determination unit to identify which codec is used in the base layer;
a symbol extraction unit to decode the base layer bitstream according to the result of the identifying in order to extract coding information used for the generating of the base layer bitstream; and
an enhancement layer coding unit to generate an enhancement layer bitstream of the original video based on the extracted coding information.
9. The apparatus of claim 8 , wherein the extracted coding information comprises at least one of block type information, motion vectors, a coded block pattern (CBP), and quantized transform coefficients.
10. The apparatus of claim 8 , wherein the codec determination unit identifies the type of the used codec, and whether the type of the used codec supports enhancement layer coding.
11. The apparatus of claim 8 , wherein the enhancement layer coding unit generates an enhancement layer bitstream by coding residual video between the original video and video reconstructed from the original video based on the extracted coding information.
12. The apparatus of claim 8 , further comprising:
a downscaling unit to downscale the received original video; and
a base layer coding unit to generate the base layer bitstream by coding the downscaled video.
13. A scalable video decoding apparatus comprising:
a bitstream separation unit to divide a received bitstream into a base layer bitstream and an enhancement layer bitstream;
a codec determination unit to identify which codec is used for decoding the base layer bitstream;
an information extraction unit to decode the base layer bitstream according to the result of the identifying in order to extract information for coding the base layer bitstream; and
an enhancement layer decoding unit to decode the enhancement layer bitstream based on the extracted information.
14. The apparatus of claim 13 , wherein the extracted information comprises at least one of block type information, motion vectors, a coded block pattern (CBP), and quantized transform coefficients.
15. A non-transitory computer readable recording medium having recorded thereon a computer program for executing a scalable video decoding method comprising:
dividing a received bitstream into a base layer bitstream and an enhancement layer bitstream;
identifying which codec is used for coding the base layer bitstream;
decoding the base layer bitstream according to the result of the identifying in order to extract information for coding the base layer bitstream; and
decoding the enhancement layer bitstream based on the extracted information.