Intra prediction method and apparatus, and image encoding/decoding method and apparatus using same

摘要

A video encoding apparatus using an intra prediction, includes: an intra predictor to predict a current block from a plurality of neighboring blocks of the current block; a subtractor to generate residual signals by subtracting predicted pixels in the predicted block from pixels in the current block; a transformer to transform the residual signals into a frequency domain; a quantizer to quantize the transformed residual signals; and an encoder to encode the quantized residual signals into a bitstream, wherein the intra predictor includes: a weighted pixel calculator configured to calculate a plurality of weighted pixel values of pixels selected in the neighboring blocks by applying weights to the pixels selected in the neighboring blocks.

主权项

1. A video encoding apparatus using an intra prediction, the apparatus comprising:
an intra predictor configured to predict a current block from a plurality of neighboring blocks of the current block; a subtractor configured to generate residual signals by subtracting predicted pixels in the predicted block from pixels in the current block; a transformer configured to transform the residual signals into a frequency domain; a quantizer configured to quantize the transformed residual signals; and an encoder configured to encode the quantized residual signals into a bitstream, wherein the intra predictor comprises:
a weighted pixel calculator configured to calculate a plurality of weighted pixel values of pixels selected in the neighboring blocks by applying weights to the pixels selected in the neighboring blocks, wherein the weights are decided variably based on a position of a current pixel to be predicted in the current block; anda pixel predictor configured to derive a predicted pixel value of the current pixel using the weighted pixel values, wherein the pixels selected in the neighboring blocks comprise:
a first pixel which is included in an upper neighboring block and located at the same column with the current pixel, anda second pixel which is included in a left neighboring block and located at the same row with the current pixel.