Method and apparatus for encoding/decoding video signal
According to the present invention, a method of decoding a video signal may include decoding division information that indicates whether a current decoding block is divided into two partial blocks, decoding information that indicates a division direction for the current decoding block when the division information indicates that the current decoding block is divided into the two partial blocks, and dividing the current decoding block into the two partial blocks according to the division direction.
1. An image decoding method, comprising:
determining an intra prediction mode of a current block;
generating a prediction block of the current block based on the intra prediction mode; and
reconstructing the current block based on the prediction block,
wherein the determining the intra prediction mode of the current block comprises
deriving a ratio of a width and a height of the current block;
determining whether the width is not equal to the height; and
when the width is not equal to the height and the intra prediction mode of the current block is within an intra prediction mode range determined based on the ratio, modifying the intra prediction mode of the current block into an intra prediction mode applicable to the current block based on the ratio,
wherein the modified intra prediction mode is used to generate the prediction block,
wherein, when the height is longer than the width, a quantity of horizontal directional intra prediction modes applicable to the current block is greater than a quantity of vertical directional intra prediction modes applicable to the current block,
wherein, when the height is at least two times longer than the width, the quantity of horizontal directional intra predication modes is at least two times larger than the quantity of vertical directional intra prediction modes, and
wherein the intra prediction mode range in a horizontal direction increases as the ratio increases.
2. The method of claim 1 ,
wherein increments of the quantity of the horizontal directional intra prediction modes applicable to the current block is decrements of the quantity of the vertical directional intra prediction modes applicable to the current block in comparison with a quantity of horizontal directional intra prediction modes and a quantity of vertical directional intra prediction modes applicable to a square block.
3. The method of claim 2 ,
wherein the increments and decrements are determined based on the ratio.
4. An image encoding method, comprising:
determining an intra prediction mode of a current block;
generating a prediction block of the current block based on the intra prediction mode;
encoding the current block based on the prediction block; and
encoding the intra prediction mode of the current block,
wherein the encoding the intra prediction mode of the current block comprises
deriving a ratio of a width and a height of the current block;
determining whether the width is not equal to the height; and
when the width is not equal to the height and the intra prediction mode of the current block is within an intra prediction mode range determined based on the ratio, modifying the intra prediction mode of the current block into an intra prediction mode applicable to the current block based on the ratio,
wherein, when the height is longer than the width, a quantity of horizontal directional intra prediction modes applicable to the current block is greater than a quantity of vertical directional intra prediction modes applicable to the current block,
wherein, when the height is at least two times longer than the width, the quantity of horizontal directional intra predication modes is at least two times larger than the quantity of vertical directional intra prediction modes, and
wherein the intra prediction mode range in a horizontal direction increases as the ratio increases.
5. A non-transitory computer readable recording medium storing a bitstream which is received, decoded and used to reconstruct an image by an image decoding apparatus, the bitstream comprises information on prediction of a current block,
wherein the information on prediction is used to determine an intra prediction mode of the current block,
the intra prediction mode is used to generate a prediction block of the current block,
the prediction block is used to reconstruct the current block, and
wherein to determine the intra prediction mode of the current block comprises
deriving a ratio of a width and a height of the current block;
determining whether the width is not equal to the height; and
when the width is not equal to the height and the intra prediction mode of the current block is within an intra prediction mode range determined based on the ratio, modifying the intra prediction mode of the current block into an intra prediction mode applicable to the current block based on the ratio,
wherein the modified intra prediction mode is used to generate the prediction block,
wherein, when the height is longer than the width, a quantity of horizontal directional intra prediction modes applicable to the current block is greater than a quantity of vertical directional intra prediction modes applicable to the current block,
wherein, when the height is at least two times longer than the width, the quantity of horizontal directional intra predication modes is at least two times larger than the quantity of vertical directional intra prediction modes, and
wherein the intra prediction mode range in a horizontal direction increases as the ratio increases.