Changeset 21466

Timestamp:

Feb 13, 2009, 11:47:42 AM (17 years ago)

Author:

Paul Price

Message:

Adding function psImageCovarianceTransfer to transfer the covariance factor (central value of covariance pseudo-matrix) from the covariance pseudo-matrix to the variance map. This allows the variance map to accurately reflect the true variance, without needing to apply the covariance factor.

Location:

trunk/psLib/src/imageops

Files:

• psImageCovariance.c (modified) (1 diff)
• psImageCovariance.h (modified) (2 diffs)

trunk/psLib/src/imageops/psImageCovariance.c

@@ -221 +221 @@
     return trunc;
 }
+
+
+bool psImageCovarianceTransfer(psImage *variance, psKernel *covar)
+{
+    PS_ASSERT_IMAGE_NON_NULL(variance, NULL);
+    PS_ASSERT_KERNEL_NON_NULL(covar, NULL);
+
+    float factor = psImageCovarianceFactor(covar); // Factor to transfer
+    psBinaryOp(variance, variance, "*", psScalarAlloc(factor, PS_TYPE_F32));
+    psBinaryOp(covar->image, covar->image, "/", psScalarAlloc(factor, PS_TYPE_F32));
+
+    return true;
+}

trunk/psLib/src/imageops/psImageCovariance.h

@@ -5 +5 @@
  * @author Paul Price, IfA
  *
- * @version $Revision: 1.4 $ $Name: not supported by cvs2svn $
- * @date $Date: 2009-02-05 20:15:32 $
+ * @version $Revision: 1.5 $ $Name: not supported by cvs2svn $
+ * @date $Date: 2009-02-13 21:47:42 $
  * Copyright 2009 Institute for Astronomy, University of Hawaii
  */
@@ -59 +59 @@
     );
 
+/// Transfer covariance factor from covariance pseudo-matrix to variance map
+bool psImageCovarianceTransfer(
+    psImage *variance,                  ///< Variance map to which to transfer
+    psKernel *covar                     ///< Covariance pseudo-matrix from which to transfer
+    );
+
+
 /// @}
 #endif // #ifndef PS_IMAGE_COVARIANCE_H