Use of DCT-based interpolation filter

The invention relates to adaptive use of pixel-based and block-based affine motion compensation. If the first sub-block size is greater than or equal to a first sub-block size threshold, sub-block based affine transform prediction is performed on an affine block using the first sub-block size. If the first sub-block size is less than the first sub-block size threshold, it is determined whether motion compensation is not performed on the affine block using a pixel-based motion vector field. If the motion vector field is not applied, sub-block based affine motion prediction is performed using a second sub-block size based on the first sub-block size. If the pixel-based motion vector field is applied, motion compensation is performed on a sub-block of the affine block using the pixel-based motion vector field. 本发明涉及基于像素和基于块的仿射运动补偿的自适应使用。如果第一子块大小大于或等于第一子块大小阈值，则使用所述第一子块大小对仿射块执行基于子块的仿射变换预测。如果所述第一子块大小小于所述第一子块大小阈值，则确定是否不应用基于像素的运动矢量场对所述仿射块执行运动补偿。如果不应用所述运动矢量场，则使用基于所述第一子块大小的第二子块大小执行基于子块的仿射运动预测。如果应用所述基于像素的运动矢量场，则使用所述基于像素