Variance Ratio on circular microparticles

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IQI Circle Ratio.png
IQI Circle Ratio legend.png
$ Ratio = \frac{\sigma_D^2}{\sigma_B^2} $

where:

  • $ \sigma_D^2 $: variance of pixel values of the detail region on microparticle step
  • $ \sigma_B^2 $: variance pixel value of the background region on uniform step with same contrast as detail