Changeset 17380

Timestamp:

Apr 7, 2008, 3:57:29 PM (18 years ago)

Author:

eugene

Message:

modify guess parameters (SXX, SYY, SXY and I0) somewhat to account for psf convolution

File:

• branches/eam_branch_20080324/psphot/src/psphotPSFConvModel.c (modified) (1 diff)

branches/eam_branch_20080324/psphot/src/psphotPSFConvModel.c

@@ -29 +29 @@
     pmModel *modelConv = pmSourceModelGuess (source, modelType);
     PS_ASSERT (modelConv, NULL);
+
+    // XXX test : modify the Io, SXX, SYY terms based on the psf SXX, SYY terms:
+    psEllipseShape psfShape;
+    psfShape.sx  = source->modelPSF->params->data.F32[PM_PAR_SXX] / M_SQRT2;
+    psfShape.sxy = source->modelPSF->params->data.F32[PM_PAR_SXY];
+    psfShape.sy  = source->modelPSF->params->data.F32[PM_PAR_SYY] / M_SQRT2;
+    psEllipseAxes psfAxes = psEllipseShapeToAxes (psfShape, 20.0);
+
+    // XXX test : modify the Io, SXX, SYY terms based on the psf SXX, SYY terms:
+    psEllipseShape extShape;
+    extShape.sx  = modelConv->params->data.F32[PM_PAR_SXX] / M_SQRT2;
+    extShape.sxy = modelConv->params->data.F32[PM_PAR_SXY];
+    extShape.sy  = modelConv->params->data.F32[PM_PAR_SYY] / M_SQRT2;
+    psEllipseAxes extAxes = psEllipseShapeToAxes (extShape, 20.0);
+
+    // decrease the initial guess ellipse by psf_minor axis:
+    psEllipseAxes extAxesMod;
+    extAxesMod.major = sqrt (PS_MAX (1.0, PS_SQR(extAxes.major) - PS_SQR(psfAxes.minor)));
+    extAxesMod.minor = sqrt (PS_MAX (1.0, PS_SQR(extAxes.minor) - PS_SQR(psfAxes.minor)));
+    extAxesMod.theta = extAxes.theta;
+
+    psEllipseShape extShapeMod = psEllipseAxesToShape (extAxesMod);
+    modelConv->params->data.F32[PM_PAR_SXX] = extShapeMod.sx * M_SQRT2;
+    modelConv->params->data.F32[PM_PAR_SXY] = extShapeMod.sxy;
+    modelConv->params->data.F32[PM_PAR_SYY] = extShapeMod.sy * M_SQRT2;
+
+    // increase the initial guess central intensity by 2pi r^2:
+    modelConv->params->data.F32[PM_PAR_I0] *= (1.0 + PS_SQR(psfAxes.minor) / PS_SQR(extAxesMod.minor));
 
     psVector *params  = modelConv->params;