Improved sub-pixel algorithm

In view of the poor antinoise performance of traditional gray weighted centroid algorithm, an improved algorithm is proposed. Object region is partitioned into inner pixel region and edge pixel region, and all grey levels of the inner pixels are averaged to effectively restrain the noise of inner pixels. At the same time, the uncertainty of improved algorithm is analyzed with error theory. Finally, simulation experiments are conducted to prove the validity of the improved algorithm, and indicate that the improved algorithm has better antinoise performance.