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jvs:fscan:manual:chapter2:expression:gradient [2011/03/31 14:49] 127.0.0.1 external edit |
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**fScan Reference Manual, Chapter 2 (CmdLineOptions: | **fScan Reference Manual, Chapter 2 (CmdLineOptions: | ||
===== Gradient -- ===== | ===== Gradient -- ===== | ||
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+ | The GRADIENT function analyzes the local intensity gradient around each voxel and generates a gradient map in which each map value is a composite index of the intensity gradient along the X, Y, and Z axes. | ||
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+ | Each map value is a 16-bit integer with 3 5-bit fields, in the binary form: ZZZZZYYYYYXXXXX\\ | ||
+ | Within each field, you should subtract 16 from the 5 bit value (0-31) to get the gradient value (-15 - +15). | ||
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+ | The gradient value indicates the average slope of the intensity gradient along that axis. | ||
**See Also:**\\ | **See Also:**\\ | ||
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[[jvs: | [[jvs: | ||
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