Patent ID: 9106928
Filing Date: 2015-08-11
Classification: H04N

Abstract:
1. A multilayer video encoding method for encoding an input video on a layer-by-layer basis, comprising: generating a base layer bitstream by performing format down-conversion on the input video and encoding the format down-converted input video; generating layer bitstreams of different formats by encoding residual videos obtained from the input video, reconstructing a base layer video from the base layer bitstream, and determining a first residual video by calculating a difference between a video obtained by performing format up-conversion on the reconstructed base layer video and a video obtained by performing format down-conversion on the input video; and reconstructing an n-th layer video from an n-th layer bitstream, and adding the reconstructed n-th layer video to a video obtained by performing format up-conversion in an (n−1)-th layer, and determining an n-th residual video by calculating a difference between the input video and a video obtained by performing format up-conversion on a result of the adding, wherein n={2, . . . , k−1} and k is an integer greater than or equal to 3, wherein an m-th layer bitstream is generated using videos reconstructed from an (m−1)-th layer to have the different formats, wherein m is an integer greater than or equal to 3, and wherein the generating of the base layer bitstream comprises performing (m−1) format down-conversion operations on the input video to generate the format down-converted input video.