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Table 2 Table showing the difference of histogram features (subcontour analysis), PP < 30 and PP < 50 in zoomed images and those without zoom. The latter were subsequently resampled to equalise their resolution (pixels/mm) with the corresponding zoomed ones, by using bilinear (BLI) or bicubic (BCI) interpolation. Percent difference with zoomed image are also shown. Statistically significant differences are highlighted.

From: Effect of zooming on texture features of ultrasonic images

Histogram features Magnification Feature value (median, interquartile range) Difference with original (x1) image % p
PPCS1 Zoomed 14.56, 9.63–29.23   
  Unzoomed 14.09, 9.07–29.07 -3.22 0.679
  BLI 13.26, 9.98–24.53 -8.97 0.811
  BLC 17.36, 10.52–29.46 19.24 0.215
PPCS2 Zoomed 12.84, 8.96–18.60   
  Unzoomed 13.07, 7.91–17.01 1.84 0.022
  BLI 13.04, 8.93–16.14 1.56 0.286
  BLC 13.48, 7.66–16.28 5.03 0.17
PPCS3 Zoomed 12.24, 9.54–14.75   
  Unzoomed 11.58, 9.26–14.06 -5.38 0.012
  BLI 11.43, 9.45–13.81 -6.59 0.031
  BLC 12.32, 8.62–14.75 0.67 0.215
PPCS4 Zoomed 10.10, 7.97–11.71   
  Unzoomed 11.02, 7.93–13.52 9.15 0.396
  BLI 11.00, 7.74–13.29 8.88 0.472
  BLC 10.76, 8.64–12.90 6.52 0.248
PPCS5 Zoomed 8.14, 6.27–11.00   
  Unzoomed 8.45, 6.17–11.01 3.77 0.879
  BLI 8.40, 7.00–10.98 3.21 0.396
  BLC 7.59, 6.74–11.08 -6.79 0.879
PP < 30 Zoomed 44.10, 32.33–59.75   
  Unzoomed 42.43, 29.35–58.38 -3.78 0.071
  BLI 38.91, 30.26–57.52 -11.77 0.248
  BLC 43.82, 27.97–61.06 -0.64 0.948
PP < 50 Zoomed 67.20, 51.71–75.61   
  Unzoomed 66.06, 50.39–74.18 -1.69 0.071
  BLI 66.23, 52.45–75.02 -1.44 0.306
  BLC 67.22, 50.10–76.80 0.03 0.5