Sub-pixel accuracy: Psychophysical validation of an algorithm for fine positioning and movement of dots on visual displays

@article{Georgeson1996SubpixelAP,
  title={Sub-pixel accuracy: Psychophysical validation of an algorithm for fine positioning and movement of dots on visual displays},
  author={Mark A. Georgeson and Tom C. A. Freeman and Nicholas E. Scott-Samuel},
  journal={Vision Research},
  year={1996},
  volume={36},
  pages={605-612}
}
Many visual experiments call for visual displays in which dots are plotted with very fine positional accuracy. Spatial hyperacuities and motion displacement thresholds can be as low as 5 sec arc. On computer graphics displays small angular displacements of a pixel can be obtained only with long viewing distances which impose a small field of view. To overcome this problem, we describe a method for positioning the centroid of a quadrel (a 2 x 2 block of pixels) with very high accuracy… CONTINUE READING

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