Index: trunk/psLib/src/imageops/psImageCovariance.h
===================================================================
--- trunk/psLib/src/imageops/psImageCovariance.h	(revision 24832)
+++ trunk/psLib/src/imageops/psImageCovariance.h	(revision 25994)
@@ -47,4 +47,7 @@
     );
 
+/// Return the covariance factor for an aperture of a given radius
+float psImageCovarianceFactorForAperture(const psKernel *covar, float radius);
+
 /// Sum multiple covariance pseudo-matrices
 psKernel *psImageCovarianceSum(