N1 N1

where n and m are spatial frequencies corresponding to the x-

where n and m are spatial frequencies corresponding to the x-

FIGURE 5 Color extraction using color distance transform. Each tissue is represented by a cluster in RGB space (the left image). The intensity of the selected color (R, G, B) is defined as a distance D from the base color (R', G',B'); D=\R - R'| + |G-G'| + |B-B'|. The middle image illustrates the intensity of the uncalcified new bone defined as a distance from the calcified new bone. The right image illustrates the intensity of the calcified new bone defined as a distance from the uncalcified new bone. See also Plate 36.

FIGURE 5 Color extraction using color distance transform. Each tissue is represented by a cluster in RGB space (the left image). The intensity of the selected color (R, G, B) is defined as a distance D from the base color (R', G',B'); D=\R - R'| + |G-G'| + |B-B'|. The middle image illustrates the intensity of the uncalcified new bone defined as a distance from the calcified new bone. The right image illustrates the intensity of the calcified new bone defined as a distance from the uncalcified new bone. See also Plate 36.

axis and the y-axis of the original image, respectively (Fig. 6). The value for N is the size of a two-dimensional square array and should be a power of 2 for the FFT algorithm.

The preferred orientation in the original image is represented by a peak in the power spectrum \F(n, m)\2 around the origin of the frequency transform (Fig. 6).

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