IRAC Dither Patterns

• Dithering is used to mitigate pixel-to-pixel gain differences, which are ɘ.5%

• Two types of dither patterns:

  • 5-point Gaussian, 12,18,24,36 pointt Reuleaux triangles
  • Cycling: observer selects number of dithers at each raster position; the dither steps are selected from a large table of random-normal spacings

• The dither patterns were selected based on a figure of merit, calculated by Arendt, Fixsen, &Moseley.

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