Changeset 21466 for trunk/psLib/src/imageops/psImageCovariance.c

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.

File:

• trunk/psLib/src/imageops/psImageCovariance.c (modified) (1 diff)

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;
+}