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Table 4 Table showing the difference of SGLDM features in zoomed images and those without zoom. The latter were subsequently resampled to equalise their resolution (pixels/cm) 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

SGLDMfeature Magnification Feature value (median, interquartile range) Difference with original (x1) image % p
ASM# Zoomed 0.00148, 0.00069–0.00611   
  Unzoomed 0.00111, 0.00060–0.00359 -24.61 0.016
  BLI 0.00097, 0.00059–0.00323 -34.05 0.001
  BLC 0.00108, 0.00056–0.00902 -26.75 0.267
Contrast Zoomed 44.05, 35.81–69.32   
  Unzoomed 75.00, 61.80–116.65 70.25 <0.001
  BLI 42.13, 33.19–66.41 -4.36 0.003
  BLC 43.32, 31.18–68.00 -1.67 0.679
Correlation Zoomed 0.98, 0.98–0.98   
  Unzoomed 0.97, 0.96–0.97 -1.28 <0.001
  BLI 0.98, 0.98–0.98 0.00 0.022
  BLC 0.98, 0.97–0.98 -0.15 0.349
Variance Zoomed 1,299.83, 802.38–2,081.63   
  Unzoomed 1,312.13, 1,047.72–2,123.97 0.95 0.349
  BLI 1,342.30, 834.83–2,090.65 3.27 0.557
  BLC 1,276.80, 845.90–2,071.28 -1.77 0.396
IDM## Zoomed 0.233, 0.182–0.315   
  Unzoomed 0.190, 0.148–0.258 -18.23 <0.001
  BLI 0.221, 0.186–0.291 -4.88 0.078
  BLC 0.249, 0.185–0.292 6.79 0.5
Sum average Zoomed 90.36, 68.64–121.92   
  Unzoomed 91.86, 70.48–123.22 1.66 0.133
  BLI 93.99, 70.47–119.52 4.02 0.472
  BLC 89.22, 69.16–119.17 -1.26 0.472
Sum variance Zoomed 5,164.32, 3,157.63–8,219.63   
  Unzoomed 5,181.82, 4,122.93–8,329.45 0.34 0.286
  BLI 5,336.16, 3,290.79–8,287.48 3.33 0.616
  BLC 5,072.63, 3,327.85–8,202.29 -1.78 0.372
Sum entropy Zoomed 5.36, 5.04–5.57   
  Unzoomed 5.39, 5.08–5.56 0.53 0.679
  BLI 5.39, 5.15–5.65 0.51 0.011
  BLC 5.36, 5.04–5.64 0.08 0.586
Entropy Zoomed 7.26, 6.72–7.70   
  Unzoomed 7.39, 6.94–7.86 1.79 0.001
  BLI 7.71, 7.13–8.00 6.14 <0.001
  BLC 7.64, 7.10–7.96 5.17 <0.001
Difference variance Zoomed 22.13, 17.46–30.19   
  Unzoomed 37.02, 29.07–50.07 67.29 <0.001
  BLI 20.68, 15.95–28.00 -6.54 0.002
  BLC 21.41, 16.54–32.15 -3.23 0.248
Difference entropy Zoomed 2.60, 2.47–2.81   
  Unzoomed 2.83, 2.72–3.05 9.05 <0.001
  BLI 2.57, 2.46–2.80 -1.04 0.011
  BLC 2.59, 2.44–2.81 -0.43 0.248
IMC-1* Zoomed -0.383, -0.406–0.358   
  Unzoomed -0.352, -0.366–0.332 -7.94 <0.001
  BLI -0.375, -0.411–0.356 -1.94 0.372
  BLC -0.369, -0.402–0.352 -3.59 0.071
IMC-2** Zoomed 0.981, 0.978–0.985   
  Unzoomed 0.977, 0.967–0.981 -0.46 <0.001
  BLI 0.985, 0.979–0.989 0.36 <0.001
  BLC 0.984, 0.977–0.987 0.23 0.306
  1. # ASM: Angular second moment, ## IDM: Inverse difference moment, *IMC-1: Information measure of correlation-1, **IMC-2: Information measure of correlation-2