초록 ▼

Provided are a scalable video encoding apparatus, a scalable video decoding apparatus, and method. The scalable video encoding apparatus includes a first encoding unit to generate a base layer bitstream, which is to be used for generating a reconstructed image having a second resolution, by encoding

Provided are a scalable video encoding apparatus, a scalable video decoding apparatus, and method. The scalable video encoding apparatus includes a first encoding unit to generate a base layer bitstream, which is to be used for generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution, and a second encoding unit to generate an enhancement layer bitstream by reconstructing the reconstructed image having the second resolution, which is received from the first encoding unit, to be a reconstructed image having the first resolution in response to an interpolation mode signal, and then to encode the original image having the first resolution by using the reconstructed image having the first resolution, where the enhancement layer bitstream contains additional information for generating a reconstructed image having the first resolution or a third resolution.

대표청구항 ▼

1. A scalable video encoding method comprising: generating a base layer bitstream, and generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution; andgenerating an enhancement layer bitstream

1. A scalable video encoding method comprising: generating a base layer bitstream, and generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution; andgenerating an enhancement layer bitstream by reconstructing the reconstructed image having the second resolution, which is received from the first encoding unit, to be a reconstructed image having the first resolution in response to an interpolation mode signal, and then encoding the original image having the first resolution by using the reconstructed image having the first resolution, where the enhancement layer bitstream contains additional information for generating a reconstructed image having the first resolution or a third resolution. 2. The method of claim 1, wherein the interpolation mode signal is determined by considering at least one of a picture type of the original image corresponding to a method used to scan the original image, and a picture type of a reconstructed image at an enhancement layer. 3. The method of claim 1, wherein the generating of an enhancement layer bitstream comprises: generating the reconstructed image having the first resolution by extending bit depths of luminance and chrominance components of the reconstructed image having the second resolution while interpolating the chrominance components, in response to the interpolation mode signal;obtaining residue data having the first resolution by subtracting the reconstructed image having the first resolution from the original image having the first resolution;obtaining residue data having the third resolution by clipping the residue data having the first resolution;performing prediction encoding on the residue data having the third resolution; andgenerating the enhancement layer bitstream including the encoded residue data having the third resolution and the interpolation mode signal. 4. The method of claim 1, wherein the generating of an enhancement layer bitstream comprises: generating the reconstructed image having the first resolution by interpolating a color component of the reconstructed image having the second resolution, in response to the interpolation mode signal;obtaining residue data having the first resolution by subtracting the reconstructed image having the first resolution from the original image having the first resolution;performing prediction encoding on the residue data having the first resolution; andgenerating the enhancement layer bitstream including the encoded residue data having the first resolution and the interpolation mode signal. 5. An enhancement layer encoding method comprising: generating a reconstructed image having a first resolution by extending bit depths of luminance and chrominance components of a reconstructed image having a second resolution while interpolating the chrominance components in response to an interpolation mode signal,obtaining residue data having the first resolution by subtracting the reconstructed image having the first resolution from the original image having the first resolution;obtaining residue data having a third resolution by clipping the residue data having the first resolution;performing prediction encoding on the residue data having the third resolution; andgenerating an enhancement layer bitstream including the encoded residue data having the third resolution and the interpolation mode signal. 6. The method of claim 5, wherein the interpolation mode signal is determined by considering at least one of a picture type of the original image corresponding to a method of scanning the original image, and a picture type of a reconstructed image at an enhancement layer. 7. The method of claim 5, wherein, if the original image is obtained through progressive scanning, the reconstructed image having the second resolution is reconstructed to be the reconstructed image having the first resolution based on the interpolation mode signal indicating a frame basis. 8. The method of claim 5, wherein, if the original image is obtained through interlaced scanning, the reconstructed image having the second resolution is reconstructed to be a reconstructed image having the first resolution based on the interpolation mode signal indicating one of a frame and a field basis. 9. The method of claim 5, wherein, if the original image is obtained through progressive scanning and the interpolation mode signal represents an interpolation mode on the frame basis, the reconstructed image that is a frame image having the first resolution is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, which are included in the reconstructed image that is a frame image having the second resolution. 10. The method of claim 5, wherein, if the original image is obtained through interlaced scanning and the interpolation mode signal represents an interpolation mode based on interlaced scanning, the reconstructed image that is a frame image having the first resolution is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in an even field image and an odd field image obtained from the reconstructed image that is a frame image having the second resolution. 11. The method of claim 5, wherein, if the original image is obtained through interlaced scanning and the interpolation mode signal represents an interpolation mode based on interlaced scanning, a reconstructed image having the first resolution of an even field is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in a reconstructed image having the second resolution of an even field, and a reconstructed image having the first resolution of an odd field is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in a reconstructed image having the second resolution of an odd field. 12. A scalable video decoding method comprising: generating a reconstructed image having a second resolution by decoding a base layer bitstream of a scalable bitstream obtained by encoding an original image having a first resolution; andgenerating a final reconstructed image having the first resolution by reconstructing the reconstructed image having the second resolution to be an interim reconstructed image having the first resolution, in response to an interpolation mode signal contained in an enhancement layer bitstream of the scalable bitstream, and then decoding the enhancement layer bitstream by using the interim reconstructed image having the first resolution. 13. The method of claim 12, wherein the interpolation mode signal is determined by considering at least one of a picture type of the original image corresponding to a method of scanning the original image and a picture type of a reconstructed image at an enhancement layer. 14. The method of claim 12, wherein the generating of a final reconstructed image having the first resolution comprises: generating the interim reconstructed image having the first resolution by extending bit depths of luminance and chrominance components of the reconstructed image having the second resolution while interpolating the chrominance components in response to the interpolation mode signal;reconstructing residue data having a third resolution by performing prediction encoding upon the enhancement layer bitstream;generating residue data having the first resolution by extending a bit depth of the residue data having the third resolution; andgenerating the final reconstructed image having the first resolution by combining the interim reconstructed image having the first resolution and the residue data having the first resolution. 15. The method of claim 12, wherein the generating of a final reconstructed image having the first resolution comprises: generating the interim reconstructed image having the first resolution by interpolating chrominance components of the reconstructed image having the second resolution in response to the interpolation mode signal;reconstructing residue data having the first resolution by performing prediction encoding upon the enhancement layer bitstream; andgenerating the final reconstructed image having the first resolution by combining the interim reconstructed image having the first resolution and the residue data having the first resolution. 16. An enhancement layer decoding method comprising: generating an interim reconstructed image having a first resolution by extending bit depths of luminance and chrominance components of a reconstructed image having a second resolution, which is obtained by decoding a base layer bitstream of a scalable bitstream, while interpolating the chrominance components, in response to an interpolation mode signal contained in an enhancement layer bitstream of the scalable bitstream which is obtained by encoding an original image having the first resolution;reconstructing residue data having a third resolution by performing prediction encoding upon the enhancement layer bitstream;generating residue data having the first resolution by extending a bit depth of the residue data having the third resolution; andgenerating a final reconstructed image having the first resolution by combining the interim reconstructed image having the first resolution and the residue data having the first resolution. 17. The method of claim 16, wherein, if the original image is obtained through progressive scanning, the reconstructed image having the second resolution is reconstructed to be the interim reconstructed image having the first resolution based on the interpolation mode signal indicating a frame basis. 18. The method of claim 16, wherein, if the original image is obtained through interlaced scanning, the reconstructed image having the second resolution is reconstructed to be the interim reconstructed image having the first resolution, based on the interpolation mode signal indicating a frame or field basis. 19. The method of claim 16, wherein, if the original image is obtained through progressive scanning and the interpolation mode signal indicates an interpolation mode on a frame basis, the interim reconstructed image having the first resolution is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in the reconstructed image having the second resolution, the interim reconstructed image having the first resolution and the reconstructed image having the second resolution being frame images. 20. The method of claim 16, wherein, if the original image is obtained through interlaced scanning and the interpolation mode signal represents an interpolation mode on a frame basis, the interim reconstructed image having the first resolution is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in an even pixel and an odd pixel obtained from the reconstructed image having the second resolution, the interim reconstructed image having the first resolution and the reconstructed image having the second resolution being frame images. 21. The method of claim 16, wherein, if the original image is obtained through interlaced scanning and the interpolation mode signal represents an interpolation mode based on a field-type, a reconstructed image having the first resolution of an even field is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in a reconstructed image having the second resolution of an even field; and a reconstructed image having the first resolution of an odd field is generated using a plurality of pixels adjacent to a pixel that is to be interpolated, in a reconstructed image having the second resolution of an odd field. 22. An enhancement layer decoding method comprising: generating an interim reconstructed image having a first resolution by interpolating chrominance components of a reconstructed image having a second resolution, which is obtained by decoding a base layer bitstream of a scalable bitstream, in response to an interpolation mode signal contained in an enhancement layer bitstream of the scalable bitstream obtained by encoding an original image having the first resolution;reconstructing residue data having the first resolution by performing prediction encoding upon the enhancement layer bitstream; andgenerating a final reconstructed image having the first resolution by combining the interim reconstructed image having the first resolution and the residue data having the first resolution. 23. At least one non-transitory computer readable medium storing instructions that control at least one processor to implement the method of claim 12. 24. At least one non-transitory computer readable medium storing instructions that control at least one processor to implement the method of claim 16. 25. At least one non-transitory computer readable medium storing instructions that control at least one processor to implement the method of claim 22.