Motion picture encoding apparatus and method thereof
Provided is a video encoding apparatus, including a signal separator to separate a differential image block into a first domain and a second domain, based on a boundary line included in the differential image block, the differential image block indicating a difference between an original image and a prediction image with respect to the original image, a transform encoder to perform a transform encoding with respect to the first domain using a discrete cosine transform (DCT), a quantization unit to quantize an output of the transform encoding unit in a frequency domain, a space domain quantization unit to quantize the second domain in a space domain, and an entropy encoder to perform an entropy encoding using outputs of the quantization unit and the space domain quantization unit.
1. A method of decoding a video with a video decoding apparatus, comprising:
obtaining a prediction image relating to a current block based on prediction mode information, the prediction mode information indicating an intra mode or an inter mode;
determining whether the current block is a first block with a size that is not a minimum size (4×4) or a second block with a size that is a minimum size (4×4);
when the current block is the second block, obtaining, from a bitstream, information indicating whether the current block is inverse-transformed or not, wherein the information is not signaled for the first block and is signaled for the second block;
performing a dequantization on residual coefficients relating to the current block;
obtaining a residual image by performing, based on the information indicating whether the current block is inverse-transformed or not, an inverse-transform on dequantized residual coefficients;
generating a reconstruction image using the residual image and the prediction image; and
applying a deblocking filter to the reconstruction image.
2. The video decoding method of claim 1 , wherein an encoded image containing the current block is partitioned into a plurality of blocks, part of the blocks are not inverse-transformed, the remaining blocks are inverse-transformed.
3. The video decoding method of claim 1 , wherein the information indicating whether the current block is inverse-transformed or not is specified by coordinate information indicating a location of the current block.
4. The video decoding method of claim 1 , wherein a size or a shape of the current block is determined based on block partition information which is signaled from the bitstream.
5. A method of encoding a video with a video encoding apparatus, comprising:
obtaining a prediction image relating to a current block based on prediction mode information relating to the current block, the prediction mode information indicating an intra mode or an inter mode;
determining whether the current block is a first block with a size that is not a minimum size (4×4) or a second block with a size that is a minimum size (4×4);
when the current block is the second block, encoding, into a bitstream, information indicating whether the current block is inverse-transformed or not, wherein the information is not signaled for the first block and is signaled for the second block;
performing a dequantization on residual coefficients relating to the current block;
obtaining a residual image by performing, based on the information indicating whether the current block is inverse-transformed or not, an inverse-transform on dequantized residual coefficients;
generating a reconstruction image using the residual image and the prediction image; and
applying a deblocking filter to the reconstruction image.
6. A non-transitory computer-readable medium storing a bitstream formed by a method of encoding a video, the method comprising:
obtaining a prediction image relating to a current block based on prediction mode information relating to the current block, the prediction mode information indicating an intra mode or an inter mode;
determining whether the current block is a first block with a size that is not a minimum size (4×4) or a second block with a size that is a minimum size (4×4);
when the current block is the second block, encoding, into a bitstream, information indicating whether the current block is inverse-transformed or not, wherein the information is not signaled for the first block and is signaled for the second block;
performing a dequantization on residual coefficients relating to the current block;
obtaining a residual image by performing, based on the information indicating whether the current block is inverse-transformed or not, an inverse-transform on dequantized residual coefficients;
generating a reconstruction image using the residual image and the prediction image; and
applying a deblocking filter to the reconstruction image.