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. A method performed by an apparatus for encoding an image, the apparatus comprising a processor,
the processor executing the steps of:
performing intra-prediction encoding by selectively using one of a plurality of prediction modes on a prediction unit to an input image so as to prediction-encode the input image; and
performing transform, quantization, and entropy encoding on a residue to generate a bit stream, the residue being a difference between the prediction unit predicted by the intra prediction or inter prediction and a current prediction unit,
wherein a coding unit has a recursive tree structure, and
when a planar intra prediction mode is activated, a predicted pixel value of an internal pixel of the 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 method of claim 1 , wherein a minimum size of the coding unit is included in a sequence parameter set.
3. The method of claim 2 , wherein a partition splitting is achieved by an asymmetric partitioning when the coding unit is split.
4. The method of claim 3 , 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 first partition having a size of 64×48 and a second partition having a size of 64×16.
5. The method of claim 3 , 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.