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Figure 3
The gradient magnitudes obtained using the Sobel operator for the image in (a) are shown in (b). The values have been rescaled to lie in [0, 255], the possible values for an 8 bit greyscale image, and darker pixels indicate higher values. In (c) the direction of the steepest gradient is plotted as an angle between 0 and 359° (also rescaled for plotting).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 38| Part 3| May 2005| Pages 493-500
doi:10.1107/S0021889805007442
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