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. 2012 Jul 3;104(13):1028–1037. doi: 10.1093/jnci/djs254

Figure 1.

Figure 1.

Image processing examples of the variation measure (V) representing four combinations of the first (lowest) and fourth (highest) quartiles of variation and percent density (PD) distributions. Top left: first quartile V (V = 205) and first quartile PD (PD = 7%); top right: first quartile V (V = 208) and fourth quartile PD (PD = 44%); bottom left: fourth quartile V (V = 394) and first quartile PD (PD = 0%); bottom right: fourth quartile V (V = 571) and fourth quartile PD (PD = 42%). The breast is segmented from the background of the mammogram image. The curved black line indicates erosion of the breast by 25%. The variation measure is calculated using the pixels bound by this curved black line and the image border on the left.