Changeset 24328 for trunk/pswarp/src/pswarpLoop.c

Timestamp:

Jun 4, 2009, 3:31:44 PM (17 years ago)

Author:

Paul Price

Message:

Correct image and variance for change in the plate scale.

File:

• trunk/pswarp/src/pswarpLoop.c (modified) (1 diff)

trunk/pswarp/src/pswarpLoop.c

@@ -297 +297 @@
     }
 
+    // Correct image for change in the plate scale
+    {
+        psAssert(input && input->fpa && input->fpa->toSky, "Require astrometry for input");
+        psAssert(outFPA && outFPA && outFPA->toSky, "Require astrometry for output");
+
+        double inScale = input->fpa->toSky->Xs + input->fpa->toSky->Ys; // Plate scale for input
+        double outScale = outFPA->toSky->Xs + outFPA->toSky->Ys; // Plate scale for output
+        float correction = PS_SQR(outScale / inScale); // Correction factor to apply to image
+        psLogMsg("pswarp", PS_LOG_INFO, "Correcting flux by %f to account for pixel scales", correction);
+
+        psBinaryOp(output->image, output->image, "*", psScalarAlloc(correction, PS_TYPE_F32));
+        if (output->variance) {
+            psBinaryOp(output->variance, output->variance, "*",
+                       psScalarAlloc(PS_SQR(correction), PS_TYPE_F32));
+        }
+    }
+
+
     // Set variance factor
     {