Figure 1. Integer and fractional sample positions for luma interpolation

From

Quarter-Pixel Accuracy Motion Estimation (ME) - A Novel ME Technique in HEVC

Kalyan Kumar Barik, Somnath Sengupta, Manas Ranjan Jena

International Transaction of Electrical and Computer Engineers System. 2014, 2(3), 107-113 doi:10.12691/iteces-2-3-5