Abstract:
A video encoding method, a video encoding apparatus, a video decoding method, and a video decoding apparatus are provided. The video encoding method includes reconstructing a first layer image based on encoding information of the first layer image that is obtained from a bitstream, splitting a largest coding unit of a second layer image into coding units based on split information of the second layer image that is obtained from the bitstream, splitting the coding units into prediction units for prediction encoding, determining whether to use a coding tool for decoding a current prediction unit based on at least one among a prediction mode of the current prediction unit among the prediction units, size information of the current prediction unit, and color depth information of the current prediction unit, and decoding the current prediction unit, using the coding tool, in response to the determining to use the coding tool.
Abstract:
An interlayer video decoding method according to an embodiment may include determining whether to perform brightness compensation with respect to a second layer current block to be reconstructed by using a first layer reference block; determining first layer reference pixels by using the closest integer pixels to reference location of a first layer corresponding to location of reference pixels for the second layer current block based on whether to perform the brightness compensation; and determining brightness compensation parameters regarding the second layer current block by using the determined first layer reference pixels and pixels surrounding the second layer current block.
Abstract:
Provided is a video decoding method including acquiring, from a bitstream, segment-wise direct component (DC) coding (SDC) mode information indicating whether an SDC mode is allowed in a depth image; determining prediction mode information and partition mode information applied to a coding unit of the depth image; acquiring an SDC flag indicating whether an SDC mode is applied to the coding unit from the bitstream according to the SDC mode information, the prediction mode information, and the partition mode information; acquiring a residual DC value corresponding to a prediction unit of the coding unit from the bitstream when the SDC flag indicates that the SDC mode is applied to the coding unit; and reconstructing a current block of the prediction unit by using the residual DC value and prediction values of the prediction unit, wherein the residual DC value is acquired from a residual block of the prediction unit.
Abstract:
An inter-layer video encoding method includes configuring at least one prediction mode as a simplified depth coding (SDC) mode; determining a prediction mode with respect to a current block of a depth image; generating a prediction block of the current block by using the prediction mode; and generating a bitstream by encoding the depth image by using the prediction block.
Abstract:
Provided are multilayer video encoding/decoding methods and apparatuses. A multilayer video decoding method may comprise obtaining, from a bitstream, information indicating a maximum size of a decoded picture buffer (DPB) with respect to a layer set comprising a plurality of layers; determining a size of the DPB with respect to the layer set based on the obtained information indicating the maximum size of the DPB; and storing a decoded picture of the layer set in the DPB of the determined size.
Abstract:
A video decoding method includes determining, from among a first sample and a second sample with different color components, at least one second sample that is used to correct a value of the first sample; determining a filter parameter set based on a band including the value of the first sample, wherein the band is from among a plurality of bands determined by dividing a total range of sample values into signaled intervals or predetermined intervals; and filtering a value of the at least one second sample by using the determined filter parameter set and correcting the value of the first sample by using a value obtained by the filtering, wherein the first sample is any one of a luma sample and a chroma sample, and the second sample is any one of the luma sample and the chroma sample that is not the first sample.
Abstract:
Provided are a video stream decoding method and apparatus, and a video stream encoding method and apparatus. The video stream decoding method includes: receiving encoded data of a video stream; obtaining, from the received encoded data, prediction information about encoded current-view image data; and decoding a current-view image by generating motion-compensated current-view image data by using at least one of the encoded current-view image data and another-view image data based on the obtained prediction information, wherein the obtained prediction information includes Advanced Motion Vector Prediction (AMVP) mode prediction information generated by using a candidate list including two candidates, and the obtained prediction information further includes a motion vector prediction flag indicating a candidate from among the two candidates included in the candidate list, which is used in generating the AMVP mode prediction information.
Abstract:
An interlayer video decoding method and apparatus and an interlayer video encoding method and apparatus are provided. The decoding method includes: reconstructing, based on encoding information obtained from a bitstream, a first layer image and a first layer depth map; determining whether a disparity vector is predictable using peripheral blocks of a second layer current block; and when the disparity vector is not predictable using the peripheral blocks, determining a disparity vector of the second layer current block using a default disparity vector and the reconstructed first layer depth map.
Abstract:
An interlayer video decoding method is provided. The interlayer video decoding method includes determining a disparity vector for performing inter layer prediction on a second layer current block with reference to a first layer image; determining a first layer reference location corresponding to the determined disparity vector in relation to a location of the second layer current block; obtaining motion information of at least one peripheral block located in the periphery of the first layer reference location; and adding at least one motion information of the obtained motion information to a candidate list for inter prediction.
Abstract:
Disclosed is a video decoding method including: obtaining a disparity vector having components in sub-pixel unit for interlayer prediction between images belonging to a current layer and a reference layer; determining a position of an integer pixel of the reference layer corresponding to a position indicated by the disparity vector obtained from the position of a current pixel of the current layer; and decoding the image of the current layer by using prediction information on a candidate area of the reference layer corresponding to the determined position of the integer pixel.