Index: trunk/psLib/src/imageops/psImageCovariance.h
===================================================================
--- trunk/psLib/src/imageops/psImageCovariance.h	(revision 25994)
+++ trunk/psLib/src/imageops/psImageCovariance.h	(revision 26892)
@@ -47,4 +47,13 @@
     );
 
+/// Return the pixel-to-pixel covariance factor following calculation
+///
+/// This doesn't require calculation of the entire covariance matrix, so is much faster.
+float psImageCovarianceCalculateFactor(
+    const psKernel *kernel,             ///< Convolution kernel
+    const psKernel *covariance          ///< Current covariance pseudo-matrix
+    );
+
+
 /// Return the covariance factor for an aperture of a given radius
 float psImageCovarianceFactorForAperture(const psKernel *covar, float radius);
@@ -81,4 +90,12 @@
     );
 
+/// Control threading for image covariance functions
+///
+/// Returns old threading status
+bool psImageCovarianceSetThreads(bool threaded ///< Run image covariance functions threaded?
+    );
+
+/// Return whether image covariance functions are threaded
+bool psImageCovarianceGetThreads(void);
 
 /// @}