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

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;
• and
• a 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;
• and
• a second pixel which is included in a left neighboring block and located at the same row with the current pixel.