Method and device for encoding/decoding image using bi-directional intra prediction

One embodiment of the present invention relates to a method and a device for encoding/decoding an image using a bi-directional intra prediction. More specifically, the present invention relates to a method and a device for encoding/decoding an image using a bi-directional intra prediction for enhancing the efficiency of an intra prediction by adaptively using not only a uni-directional prediction but also a bi-directional prediction in making the intra prediction.