MOTION PICTURE ENCODING/DECODING APPARATUS, AND METHOD AND APPARATUS FOR HYBRID BLOCK MOTION COMPENSATION/OVERLAPPED BLOCK MOTION COMPENSATION FOR SAME

摘要

The present invention provides a hybrid block motion compensation/adaptive overlapped block motion compensation apparatus for an encoding apparatus, said compensation apparatus comprising: a BMC/OBMC selection unit for selecting either a block motion compensation (BMC) or an overlapped block motion compensation (OBMC) by pixel units for the present block in accordance with a preset reference; an adaptive motion compensation unit for performing the motion compensation selected by the BMC/OBMC selection unit; a scan mode setting unit for scanning the present block in accordance with a plurality of preset scan modes, and setting the scan mode least frequently switching between the BMC and the OBMC; and an information recording unit for recording switching information at the position of the pixel relevant to the switching between the BMC and the OBMC, when a scanning is performed in accordance with the preset scan mode. The present invention provides a decoding apparatus comprising: an information interpreting unit for interpreting scan mode information of the present block and information of switching between the block motion compensation and the overlapped block motion compensation for each pixel of the present block; and an adaptive motion compensation unit for performing an adaptive motion compensation for each pixel on the basis of the scan mode information and the information of switching interpreted by the information interpreting unit. The present invention performs optimum motion compensation with a lower complexity by using a significantly small volume of additional information, thereby improving encoding/decoding performance.