Motion picture encoding/decoding apparatus, and method and apparatus for hybrid block motion compensation/overlapped block motion compensation for same

A hybrid block motion compensation/adaptive overlapped block motion compensation method comprising:

• performing a BMC/OBMC selection between a block motion compensation BMC and an overlapped block motion compensation OBMC with respect to a current block in units of pixels according to a set criterion;
• scanning the current block in a plurality of set scan modes and establishing a scan mode causing a smallest number of transitions between the BMC and the OBMC;
• recording transition information at locations of the pixels corresponding to the transitions between the BMC and the OBMC;
• and
• performing a motion compensation according to the BMC/OBMC selection.

A video encoding apparatus comprising:

• a motion estimator/compensator for performing a selection between a block motion compensation BMC and an overlapped block motion compensation OBMC with respect to a current block in units of pixels, performing a motion compensation after the selection to predict a predicted pixel value of each of the pixels, scanning the current block in a plurality of set scan modes and generating an established scan mode causing a smallest number of transitions between the BMC and the OBMC, and recording transition information during the scanning in the established scan mode at locations of the pixels corresponding to the transitions between the BMC and the OBMC;
• a subtractor for generating a residual signal by calculating a difference of the predicted pixel value of each of the pixels of the current block to an original pixel value of each of the pixels of the current block;
• a transformer for performing a transform on the residual signal into frequency coefficients;
• a quantizer for performing a quantization the frequency coefficients after the transform;
• and
• an encoder for encoding the frequency coefficients after the quantization into a bitstream.

A video decoding method comprising:

• performing an interpretation of information on a scan mode of a current block;
• performing an interpreting of information on transitions between a block motion compensation and an overlapped block motion compensation with respect to each of pixels of the current block;
• and
• performing an adaptive motion compensation in units of the pixels based on the information on a scan mode after the interpretation and the information on transitions after the interpretation.