Patent ID: 8743955

Claim:
A video encoding method of generating a scalable bitstream formed with a base layer bitstream and an enhancement layer bitstream in order to provide forward compatibility, the method comprising: reconstructing an image having an extended bit-depth and an extended video format into an image having a base bit-depth and a base video format, encoding the reconstructed image, and as a result of the encoding of the image having the base bit-depth and the base video format, generating a base layer bitstream; and reconstructing the image having the extended bit-depth and extended video format into an image having the extended bit-depth and the base video format, and by using the result of the encoding of the image having the base bit-depth and the base video format, encoding the image having the extended bit-depth and the base video format, and generating an enhancement layer bitstream including a result of the encoding of the image having the extended bit-depth and the base video format and additional chrominance component data required for the extended video format, wherein the result of the encoding of the image having the base bit-depth and the base video format includes a base quantization level and a base quantization parameter, and wherein in the encoding the image having the extended bit depth and the base video format comprises generating an extended quantization level using an extended quantization parameter, the extended quantization parameter being derived by using the base quantization parameter and a refined quantization parameter that refines the difference between the base bit-depth and the extended bit-depth.