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Subtract the mean rotation of a vector field.

SF = **subsbr**(F,R0) subtracts the mean rotation of the vector field
(or field array) F, centered on R0 = [X0 Y0] in physical units (mm).
For each field F, the mean rotation is determined as (half) the curl of
F averaged over space. If R0 is not specified, the central point of the
field is taken.
**subsbr** is useful for processing vector fields originating from a camera
or device with a residual background rotation (solid-body rotation).
spaverf(vec2scal(**subsbr**(V,R0),'rot')) gives a zero scalar field for all
V and R0.
If no output argument, the result is displayed by showf.

**See Also**
averf, spaverf, vec2scal, rotatef.
Published output in the Help browser
showdemo **subsbr**

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