Sk Telecom Company, Ltd.

Kioh Kim

Byeungwoo Jeon

Yunglyul Lee

Joohee Moon

Haekwang Kim

Daeyeon Kim

Jeongyeon Lim

Sunyeon Kim

HaYoon Kim

Sungwook Hong

Donghoon Han

Jeonghoon Seo

Jongki Han

Gyumin Lee

Jaehoon Choi

A method for encoding pixels in an image, includes: encoding an offset to be applied to a reference frame; generating predicted pixels of the pixels in the image, based on interpolating pixels in the reference frame and then adding the offset to the interpolated pixels; and encoding residual signals that are differences between the pixels in the image and the predicted pixels, wherein the encoding of the residual signals comprises: skipping both transform and quantization with respect to residual signals of which an encoding scheme corresponds to skipping of both transform and quantization, the encoding scheme related to transform and quantization, skipping transform and performing quantization with respect to residual signals of which the encoding scheme corresponds to skipping of transform, and performing transform and quantization with respect to residual signals of which the encoding scheme corresponds to skipping neither transform nor quantization.

Method and apparatus for generating a reference frame and method and apparatus for encoding/decoding image using the same

An apparatus for generating a reference frame is disclosed including: an interpolation unit for interpolating a reference frame per fractional pixel; a virtual encoder for determining a block mode of a current frame and a motion vector according to the block mode by using an interpolated reference frame; an offset calculator for calculating an offset for each pixel of the interpolated reference frame by using the block mode and the motion vector; and an offset adder for generating an offset interpolated reference frame by adding the offset for each pixel to each pixel of the interpolated reference frame. By adding the offset calculated according to the block mode to the reference frame for the inter prediction and making the reference frame to be used for the motion estimation and compensation similar to the current frame to be encoded, motion prediction is accurate and compression efficiency is improved.

A video decoding apparatus includes a decoder to decode division information related to dividing a current block into subblocks, and reconstruct transform coefficients of each of the subblocks identified by the division information, and thereby generate transformed residual subblocks; an inverse transformer to inverse-transform each of the transformed residual subblocks, and thereby generate residual subblocks; a predictor to generate predicted subblocks by intra-predicting each of the subblocks; an adder to reconstruct the current block by adding the predicted subblocks to the residual subblocks corresponding thereto; and a first filter to perform deblocking-filtering on boundaries between the subblocks in a reconstructed picture including the reconstructed current block.

Encoding/decoding method and device for high-resolution moving images

An image encoding and decoding method comprising: a coefficient calculator for calculating adaptive interpolation filter coefficient of a current frame; an image encoder for interpolating reference frames using the adaptive interpolation filter coefficient of the current frame and encoding the current frame using the interpolated reference frames; a filter flag encoder for generating and encoding a coefficient-inserted flag or coefficient non-inserted flag as a filter flag according to the adaptive interpolation filter coefficient of the current frame; a coefficient encoder for encoding the adaptive interpolation filter coefficient of the current frame when the filter flag is a coefficient-inserted flag; and a bit stream generator for generating and outputting a bit stream, which includes the encoded current frame and encoded filter flag, and further includes encoded adaptive interpolation filter coefficient of the current frame when the filter flag is the coefficient-inserted flag.

Image encoding/decoding method and device using coefficients of adaptive interpolation filter

A video encoding method includes: determining a size of a current block to be encoded and encoding information for indicating the size of the current block; encoding division information related to dividing the current block into one or more subblocks; predicting a subblock divided from the current block by using an intra prediction mode corresponding to the subblock; generating a residual block by subtracting the predicted block from the subblock; transforming the residual subblock by using a transform size identical to a size of the subblock; and encoding information on transform coefficients of the transformed residual subblock.

The present disclosure provides a video encoding apparatus and method and a video decoding apparatus and method. The video encoding apparatus, includes: a block mode determiner for determining a block mode of a current block; an NCI block intra encoder responsive if the block mode of the current block determined by the block mode determiner is an intra mode and neighboring blocks of the current block include an NCI block, for encoding the NCI block through an intra prediction of the NCI block; and a current block intra encoder responsive if the block mode of the current block determined by the block mode determiner is the intra mode and the neighboring blocks of the current block include the NCI block, for encoding the current block through an intra prediction of the current block.

Video coding device, video coding method thereof, video decoding device, and video decoding method thereof

Disclosed is a high-resolution video encoding/decoding method and apparatus. The video encoding method includes: predicting a current block to generate a predicted block, subtracting the predicted block from the current block to generate a residual block, determining a transform and quantization type according to the block type of the current block; transforming and quantizing the residual block according to the determined transform and quantization type; and encoding the transformed and quantized residual block. According to the video encoding/decoding method and apparatus, not only the encoding efficiency can be improved because it enables an encoding using a high correlation between temporally/spatially adjacent pixels appearing in a video, but the compression efficiency can also be improved by reducing block distortion.

An image encoding/decoding method and apparatus using coefficients of an adaptive interpolation filter are disclosed including: a coefficient calculator for calculating adaptive interpolation filter coefficient of a current frame; an image encoder for interpolating reference frames using the adaptive interpolation filter coefficient of the current frame and encoding the current frame using the interpolated reference frames; a filter flag encoder for generating and encoding a coefficient-inserted flag or coefficient non-inserted flag as a filter flag according to the adaptive interpolation filter coefficient of the current frame; a coefficient encoder for encoding the adaptive interpolation filter coefficient of the current frame when the filter flag is a coefficient-inserted flag; and a bit stream generator for generating and outputting a bit stream, which includes the encoded current frame and encoded filter flag, and further includes encoded adaptive interpolation filter coefficient of the current frame when the filter flag is the coefficient-inserted flag.

Growing community of inventors

Anyang-si, South Korea

Kioh Kim