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

摘要

A video decoding apparatus using an intra prediction, includes: a decoder to decode a bitstream to thereby extract residual signals; an inverse quantizer to inversely quantize the residual signals; an inverse transformer to inversely transform the inversely quantized residual signals; an intra predictor to predict a current block from a plurality of neighboring blocks of the current block; and an adder to add the inversely transformed residual signals to the predicted pixels in the predicted block, wherein the intra predictor includes a weighted pixel calculator 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, the weights being decided variably based on a position of a current pixel to be predicted in the current block; and a pixel predictor to derive a predicted pixel value of the current pixel using the weighted pixel values.

主权项

1. A video decoding apparatus using an intra prediction, the apparatus comprising:
a decoder configured to decode a bitstream to thereby extract residual signals; an inverse quantizer configured to inversely quantize the residual signals; an inverse transformer configured to inversely transform the inversely quantized residual signals; an intra predictor configured to predict a current block from a plurality of neighboring blocks of the current block; and an adder configured to add the inversely transformed residual signals to the predicted pixels in the predicted block, 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, and 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.