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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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