CPC H04N 19/119 (2014.11) [H04N 19/129 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/593 (2014.11); H04N 19/61 (2014.11)] | 11 Claims |
1. A method of decoding an image, the method comprising:
determining a secondary transform performing area of a current transform block;
acquiring a current 1-D transform array using a plurality of transform coefficients of the second transform performing area;
performing secondary inverse-transform on the current 1-D transform array; and
performing primary inverse-transform on a primary transform performing area of the current transform block,
wherein the secondary transform performing area is determined based on a low frequency area in a left upper area of the current block, and the secondary inverse-transform is not performed on an area that is not the secondary transform performing area, and
the primary transform performing area is determined equal to an entire area of the current block.
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