Methods and apparatuses for encoding/decoding high resolution images
The invention relates to methods and apparatuses for encoding/decoding high resolution images, which involve setting the size of the prediction unit to be encoded to an expanded macro-block size in accordance with the temporal frequency characteristics or spatial frequency characteristics among pictures to be encoded, and performing motion prediction motion compensation, and transformation on the basis of a set prediction unit size. In addition, the methods and the apparatuses of the present invention involve dividing a macro-block having a pixel size of 32*32 or 64*64 into at least one partition on the basis of an edge, and performing encoding processes for each partition. Accordingly, encoding efficiency can be improved for high definition (HD) or higher resolution high-resolution images.
1. An apparatus for decoding an image, the apparatus comprising:
an inverse-transforming unit configured to restore a residue by entropy-decoding a received bit stream and by performing inverse quantization and inverse transform on the residue;
an intra predicting unit configured to generate a prediction unit by performing intra-prediction that selectively uses one of a plurality of prediction modes on a prediction unit; and
an adder configured to restore the image by adding the residue to the prediction unit,
wherein a coding unit has a recursive tree structure,
the prediction unit corresponds to a leaf coding unit when a coding unit is split and reaches a maximum permissible depth, and
when a planar intra prediction mode is activated, a predicted pixel value of an internal pixel of a current prediction unit is obtained by performing bilinear interpolation using (i) vertically and horizontally directional corresponding internal boundary prediction pixel values in the current prediction unit and (ii) vertically and horizontally directional corresponding pixel values in previously decoded left side block and upper end block of the current prediction unit.
2. The apparatus of claim 1 , wherein a partition splitting is achieved by an asymmetric partitioning when the prediction unit is split.
3. The apparatus of claim 2 , wherein the asymmetric partitioning is conducted along a horizontal direction to split the prediction unit
into a first partition having a size of 64×16 and a second partition having a size of 64×48, or
into a second partition having a size of 64×48 and a second partition having a size of 64×16.
4. The apparatus of claim 2 , wherein the asymmetric partitioning is performed along a vertical direction to split the prediction unit
into a first partition having a size of 16×64 and a second partition having 48×64, or
into a first partition having a size of 48×64 and a second partition having a size of 16×64.
5. The apparatus of claim 1 , wherein a minimum size of the coding unit is included in a sequence parameter set.