Encoders, decoders, methods, and video bit streams, and computer programs for hybrid video coding

A video decoder configured to:

• decode from a video bit stream syntax elements, the syntax elements comprising an indication of an adaptive motion vector resolution (AMVR) mode and an indication of whether an inter prediction mode is translational or affine for a coding block of a picture;
• select, depending on the indicated AMVR mode and the indication of whether the inter prediction mode is translational or affine, a finite impulse response (FIR) interpolation filter from a plurality of FIR interpolation filters for obtaining a sample corresponding to a half-sample position of a reference picture of the coding block, the plurality of FIR interpolation filters comprising an interpolation filter with 6 nonzero coefficients of 3, 9, 20, 20, 9, 3 and an interpolation filter with 8 nonzero coefficients of −1, 4, −11, 40, 40, −11, 4, −1;
• apply the selected FIR interpolation filter to samples of the reference picture to obtain the sample corresponding to the half-sample position;
• and
• predict a sample of the coding block using the sample corresponding to the half-sample position.

A method of video encoding, the method comprising:

• encoding syntax elements comprising an indication of an adaptive motion vector resolution (AMVR) mode and an indication of whether an inter prediction mode is translational or affine for a coding block of a picture;
• selecting, depending on the indicated AMVR mode and the indication of whether the inter prediction mode is translational or affine, a finite impulse response (FIR) interpolation filter from a plurality of FIR interpolation filters for obtaining a sample corresponding to a half-sample position of a reference picture of the coding block, the plurality of FIR interpolation filters comprising an interpolation filter with 6 nonzero coefficients of 3, 9, 20, 20, 9, 3 and an interpolation filter with 8 nonzero coefficients of −1, 4, −11, 40, 40, −11, 4, −1;
• applying the selected FIR interpolation filter to samples of the reference picture to obtain the sample corresponding to the half-sample position;
• and
• predicting a sample of the coding block using the sample corresponding to the half-sample position.

A method for video decoding, the method comprising:

• decoding from a video bit stream syntax elements, the syntax elements comprising an indication of an adaptive motion vector resolution (AMVR) mode and an indication of whether an inter prediction mode is translational or affine for a coding block of a picture;
• selecting, depending on the indicated AMVR mode and the indication of whether the inter prediction mode is translational or affine, a finite impulse response (FIR) interpolation filter from a plurality of FIR interpolation filters for obtaining a sample corresponding to a half-sample position of a reference picture of the coding block, the plurality of FIR interpolation filters comprising an interpolation filter with 6 nonzero coefficients of 3, 9, 20, 20, 9, 3 and an interpolation filter with 8 nonzero coefficients of −1, 4, −11, 40, 40, −11, 4, −1;
• applying the selected FIR interpolation filter to samples of the reference picture to obtain the sample corresponding to the half-sample position;
• and
• predicting a sample of the coding block using the sample corresponding to the half-sample position.

A non-transitory computer readable storage medium comprising instructions, which when executed by at least one processor cause the at least one processor to perform the steps of:

• encoding syntax elements comprising an indication of an adaptive motion vector resolution (AMVR) mode and an indication of whether an inter prediction mode is translational or affine for a coding block of a picture;
• selecting, depending on the indicated AMVR mode and the indication of whether the inter prediction mode is translational or affine, a finite impulse response (FIR) interpolation filter from a plurality of FIR interpolation filters for obtaining a sample corresponding to a half-sample position of a reference picture of the coding block, the plurality of FIR interpolation filters comprising an interpolation filter with 6 nonzero coefficients of 3, 9, 20, 20, 9, 3 and an interpolation filter with 8 nonzero coefficients of −1, 4, −11, 40, 40, −11, 4, −1;
• applying the selected FIR interpolation filter to samples of the reference picture to obtain the sample corresponding to the half-sample position;
• and
• predicting a sample of the coding block using the sample corresponding to the half-sample position.

A non-transitory computer readable storage medium comprising instructions, which when executed by at least one processor cause the at least one processor to perform the steps of:

• decoding from a video bit stream syntax elements, the syntax elements comprising an indication of an adaptive motion vector resolution (AMVR) mode and an indication of whether an inter prediction mode is translational or affine for a coding block of a picture;
• selecting, depending on the indicated AMVR mode and the indication of whether the inter prediction mode is translational or affine, a finite impulse response (FIR) interpolation filter from a plurality of FIR interpolation filters for obtaining a sample corresponding to a half-sample position of a reference picture of the coding block, the plurality of FIR interpolation filters comprising an interpolation filter with 6 nonzero coefficients of 3, 9, 20, 20, 9, 3 and an interpolation filter with 8 nonzero coefficients of −1, 4, −11, 40, 40, −11, 4, −1;
• applying the selected FIR interpolation filter to samples of the reference picture to obtain the sample corresponding to the half-sample position;
• and
• predicting a sample of the coding block using the sample corresponding to the half-sample position.