Image processing method, and image decoding and encoding method using same

An image processing method comprising:

• receiving an encoded bit stream;
• performing inverse quantization and inverse transform on the received bit stream and obtaining a residual block;
• obtaining a prediction block by performing an inter prediction or an intra prediction;
• reconstructing an image by summing the obtained residual block and the prediction block;
• and
• performing adaptive loop filtering by each coding tree unit for the reconstructed image,
• wherein a coding unit, which is a basic unit in which the inter prediction or the intra prediction is performed, is a block divided from a coding tree unit using a binary tree structure, and
• a prediction mode list for deriving a prediction direction of a decoding target block from an intra prediction direction of a neighboring block adjacent to the decoding target block is selectively configured for an intra predicted unit of the divided coding units in the step of obtaining the prediction block.