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Parker Medical Imaging Research

The Blue Noise Mask

Invented by Professor Parker and Theophano Mitsa, PhD, the Blue Noise Mask was an advance in halftoning. Researchers at the University of Rochester designed the first Blue Noise Mask with substantial computer power and several years of hard work. The Mask was introduced to graphics and other industries in 1991. At that time, it was the first method to combine high quality with virtually instantaneous halftoning. for more information, see Professor Parker's Blue Noise Mask page. You can also read about the Blue Noise Mask in the Rochester Review.

Digital halftoning technique using a blue-noise mask
T. Mitsa and K. J. Parker
J Opt Soc Am, vol. 9, no. 11 , pp. 1920 -1929  (1992). View PDF


Journal Articles


  1. Burr, Lomax, Pareto, and logistic distributions from ultrasound speckle
    K. J. Parker and S. S. Poul
    Ultrasonic Imaging, vol. 42, no. 4-5 , pp. 203 -212  (2020). View PDF
  2. Speckle from branching vasculature: dependence on number density
    K. J. Parker and S. S. Poul
    J Med Imaging, vol. 7, no. 2 , pp. 027001-1 -027001-12  (2020). View PDF
  3. Liver backscatter and the hepatic vasculature's autocorrelation function
    J. J. Carroll-Nellenback, R. J. White, R. W. Wood, and K. J. Parker
    Acoustics, vol. 2, no. 1 , pp. 3 -12  (2020). View PDF
  4. The first order statistics of backscatter from the fractal branching vasculature
    K. J. Parker
    J Acoust Soc Am, vol. 146, no. 5 , pp. 3318 -3326  (2019). View PDF
  5. Shapes and distributions of soft tissue scatterers
    K. J. Parker
    Phys Med Biol, vol. 64, no. 17 , pp. 175022-1 -175022-15  (2019). View PDF
  6. The 3D spatial autocorrelation of the branching fractal vasculature
    K. J. Parker, J. J. Carroll-Nellenback, and R. W. Wood
    Acoustics, vol. 1, no. 2 , pp. 369 -381  (2019). View PDF